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All Superinterfaces:

ConfigMergeable
```
public interface Config
extends ConfigMergeable
```
An immutable map from config paths to config values. Paths are dot-separated expressions such as foo.bar.baz. Values are as in JSON (booleans, strings, numbers, lists, or objects), represented by ConfigValue instances. Values accessed through the Config interface are never null.
Config is an immutable object and thus safe to use from multiple threads. There's never a need for "defensive copies."
Fundamental operations on a Config include getting configuration values, resolving substitutions with resolve(), and merging configs using withFallback(ConfigMergeable).
All operations return a new immutable Config rather than modifying the original instance.
Examples
You can find an example app and library on GitHub. Also be sure to read the package overview which describes the big picture as shown in those examples.
Paths, keys, and Config vs. ConfigObject
Config is a view onto a tree of ConfigObject; the corresponding object tree can be found through root(). ConfigObject is a map from config keys, rather than paths, to config values. Think of ConfigObject as a JSON object and Config as a configuration API.
The API tries to consistently use the terms "key" and "path." A key is a key in a JSON object; it's just a string that's the key in a map. A "path" is a parseable expression with a syntax and it refers to a series of keys. Path expressions are described in the spec for Human-Optimized Config Object Notation. In brief, a path is period-separated so "a.b.c" looks for key c in object b in object a in the root object. Sometimes double quotes are needed around special characters in path expressions.
The API for a Config is in terms of path expressions, while the API for a ConfigObject is in terms of keys. Conceptually, Config is a one-level map from paths to values, while a ConfigObject is a tree of nested maps from keys to values.
Use ConfigUtil.joinPath(java.lang.String...) and ConfigUtil.splitPath(java.lang.String) to convert between path expressions and individual path elements (keys).
Another difference between Config and ConfigObject is that conceptually, ConfigValues with a valueType() of NULL exist in a ConfigObject, while a Config treats null values as if they were missing. (With the exception of two methods: hasPathOrNull(java.lang.String) and getIsNull(java.lang.String) let you detect null values.)
Getting configuration values
The "getters" on a Config all work in the same way. They never return null, nor do they return a ConfigValue with valueType() of NULL. Instead, they throw ConfigException.Missing if the value is completely absent or set to null. If the value is set to null, a subtype of ConfigException.Missing called ConfigException.Null will be thrown. ConfigException.WrongType will be thrown anytime you ask for a type and the value has an incompatible type. Reasonable type conversions are performed for you though.
Iteration
If you want to iterate over the contents of a Config, you can get its ConfigObject with root(), and then iterate over the ConfigObject (which implements java.util.Map). Or, you can use entrySet() which recurses the object tree for you and builds up a Set of all path-value pairs where the value is not null.
Resolving substitutions
Substitutions are the ${foo.bar} syntax in config files, described in the specification. Resolving substitutions replaces these references with real values.
Before using a Config it's necessary to call resolve() to handle substitutions (though ConfigFactory.load() and similar methods will do the resolve for you already).
Merging
The full Config for your application can be constructed using the associative operation withFallback(ConfigMergeable). If you use ConfigFactory.load() (recommended), it merges system properties over the top of application.conf over the top of reference.conf, using withFallback. You can add in additional sources of configuration in the same way (usually, custom layers should go either just above or just below application.conf, keeping reference.conf at the bottom and system properties at the top).
Serialization
Convert a Config to a JSON or HOCON string by calling ConfigValue.render() on the root object, myConfig.root().render(). There's also a variant ConfigValue.render(ConfigRenderOptions) which allows you to control the format of the rendered string. (See ConfigRenderOptions.) Note that Config does not remember the formatting of the original file, so if you load, modify, and re-save a config file, it will be substantially reformatted.
As an alternative to ConfigValue.render(), the toString() method produces a debug-output-oriented representation (which is not valid JSON).
Java serialization is supported as well for Config and all subtypes of ConfigValue.
This is an interface but don't implement it yourself
Do not implement Config; it should only be implemented by the config library. Arbitrary implementations will not work because the library internals assume a specific concrete implementation. Also, this interface is likely to grow new methods over time, so third-party implementations will break.

Method Summary

All Methods Instance Methods Abstract Methods Deprecated Methods
Modifier and Type	Method and Description
`Config`	`atKey(java.lang.String key)` Places the config inside a `Config` at the given key.
`Config`	`atPath(java.lang.String path)` Places the config inside another `Config` at the given path.
`void`	`checkValid(Config reference, java.lang.String... restrictToPaths)` Validates this config against a reference config, throwing an exception if it is invalid.
`java.util.Set<java.util.Map.Entry<java.lang.String,ConfigValue>>`	`entrySet()` Returns the set of path-value pairs, excluding any null values, found by recursing `the root object`.
`java.lang.Object`	`getAnyRef(java.lang.String path)` Gets the value at the path as an unwrapped Java boxed value ( `Boolean`, `Integer`, and so on - see `ConfigValue.unwrapped()`).
`java.util.List<? extends java.lang.Object>`	`getAnyRefList(java.lang.String path)` Gets a list value with any kind of elements.
`boolean`	`getBoolean(java.lang.String path)`
`java.util.List<java.lang.Boolean>`	`getBooleanList(java.lang.String path)` Gets a list value with boolean elements.
`java.lang.Long`	`getBytes(java.lang.String path)` Gets a value as a size in bytes (parses special strings like "128M").
`java.util.List<java.lang.Long>`	`getBytesList(java.lang.String path)` Gets a list value with elements representing a size in bytes.
`Config`	`getConfig(java.lang.String path)`
`java.util.List<? extends Config>`	`getConfigList(java.lang.String path)` Gets a list value with `Config` elements.
`double`	`getDouble(java.lang.String path)`
`java.util.List<java.lang.Double>`	`getDoubleList(java.lang.String path)` Gets a list value with double elements.
`java.time.Duration`	`getDuration(java.lang.String path)` Gets a value as a java.time.Duration.
`long`	`getDuration(java.lang.String path, java.util.concurrent.TimeUnit unit)` Gets a value as a duration in a specified `TimeUnit`.
`java.util.List<java.time.Duration>`	`getDurationList(java.lang.String path)` Gets a list, converting each value in the list to a duration, using the same rules as `getDuration(String)`.
`java.util.List<java.lang.Long>`	`getDurationList(java.lang.String path, java.util.concurrent.TimeUnit unit)` Gets a list, converting each value in the list to a duration, using the same rules as `getDuration(String, TimeUnit)`.
`<T extends java.lang.Enum<T>> T`	`getEnum(java.lang.Class<T> enumClass, java.lang.String path)`
`<T extends java.lang.Enum<T>> java.util.List<T>`	`getEnumList(java.lang.Class<T> enumClass, java.lang.String path)` Gets a list value with `Enum` elements.
`int`	`getInt(java.lang.String path)` Gets the integer at the given path.
`java.util.List<java.lang.Integer>`	`getIntList(java.lang.String path)` Gets a list value with int elements.
`boolean`	`getIsNull(java.lang.String path)` Checks whether a value is set to null at the given path, but throws an exception if the value is entirely unset.
`ConfigList`	`getList(java.lang.String path)` Gets a list value (with any element type) as a `ConfigList`, which implements `java.util.List<ConfigValue>`.
`long`	`getLong(java.lang.String path)` Gets the long integer at the given path.
`java.util.List<java.lang.Long>`	`getLongList(java.lang.String path)` Gets a list value with long elements.
`ConfigMemorySize`	`getMemorySize(java.lang.String path)` Gets a value as an amount of memory (parses special strings like "128M").
`java.util.List<ConfigMemorySize>`	`getMemorySizeList(java.lang.String path)` Gets a list, converting each value in the list to a memory size, using the same rules as `getMemorySize(String)`.
`java.lang.Long`	`getMilliseconds(java.lang.String path)` Deprecated. As of release 1.1, replaced by `getDuration(String, TimeUnit)`
`java.util.List<java.lang.Long>`	`getMillisecondsList(java.lang.String path)` Deprecated. As of release 1.1, replaced by `getDurationList(String, TimeUnit)`
`java.lang.Long`	`getNanoseconds(java.lang.String path)` Deprecated. As of release 1.1, replaced by `getDuration(String, TimeUnit)`
`java.util.List<java.lang.Long>`	`getNanosecondsList(java.lang.String path)` Deprecated. As of release 1.1, replaced by `getDurationList(String, TimeUnit)`
`java.lang.Number`	`getNumber(java.lang.String path)`
`java.util.List<java.lang.Number>`	`getNumberList(java.lang.String path)` Gets a list value with number elements.
`ConfigObject`	`getObject(java.lang.String path)`
`java.util.List<? extends ConfigObject>`	`getObjectList(java.lang.String path)` Gets a list value with object elements.
`java.time.Period`	`getPeriod(java.lang.String path)` Gets a value as a java.time.Period.
`java.lang.String`	`getString(java.lang.String path)`
`java.util.List<java.lang.String>`	`getStringList(java.lang.String path)` Gets a list value with string elements.
`java.time.temporal.TemporalAmount`	`getTemporal(java.lang.String path)` Gets a value as a java.time.temporal.TemporalAmount.
`ConfigValue`	`getValue(java.lang.String path)` Gets the value at the given path, unless the value is a null value or missing, in which case it throws just like the other getters.
`boolean`	`hasPath(java.lang.String path)` Checks whether a value is present and non-null at the given path.
`boolean`	`hasPathOrNull(java.lang.String path)` Checks whether a value is present at the given path, even if the value is null.
`boolean`	`isEmpty()` Returns true if the `Config`'s root object contains no key-value pairs.
`boolean`	`isResolved()` Checks whether the config is completely resolved.
`ConfigOrigin`	`origin()` Gets the origin of the `Config`, which may be a file, or a file with a line number, or just a descriptive phrase.
`Config`	`resolve()` Returns a replacement config with all substitutions (the `${foo.bar}` syntax, see the spec) resolved.
`Config`	`resolve(ConfigResolveOptions options)` Like `resolve()` but allows you to specify non-default options.
`Config`	`resolveWith(Config source)` Like `resolve()` except that substitution values are looked up in the given source, rather than in this instance.
`Config`	`resolveWith(Config source, ConfigResolveOptions options)` Like `resolveWith(Config)` but allows you to specify non-default options.
`ConfigObject`	`root()` Gets the `Config` as a tree of `ConfigObject`.
`Config`	`withFallback(ConfigMergeable other)` Returns a new value computed by merging this value with another, with keys in this value "winning" over the other one.
`Config`	`withOnlyPath(java.lang.String path)` Clone the config with only the given path (and its children) retained; all sibling paths are removed.
`Config`	`withoutPath(java.lang.String path)` Clone the config with the given path removed.
`Config`	`withValue(java.lang.String path, ConfigValue value)` Returns a `Config` based on this one, but with the given path set to the given value.

- Method Detail
  - root
```
root()
```
    Gets the Config as a tree of ConfigObject. This is a constant-time operation (it is not proportional to the number of values in the Config).
    
    Returns:
    
    the root object in the configuration
  - origin
```
origin()
```
    Gets the origin of the Config, which may be a file, or a file with a line number, or just a descriptive phrase.
    
    Returns:
    
    the origin of the Config for use in error messages
  - withFallback
```
withFallback(ConfigMergeable other)
```
    Description copied from interface: ConfigMergeable
    Returns a new value computed by merging this value with another, with keys in this value "winning" over the other one.
    This associative operation may be used to combine configurations from multiple sources (such as multiple configuration files).
    The semantics of merging are described in the spec for HOCON. Merging typically occurs when either the same object is created twice in the same file, or two config files are both loaded. For example:
```
  foo = { a: 42 }
  foo = { b: 43 }
 
```
    Here, the two objects are merged as if you had written:
```
  foo = { a: 42, b: 43 }
 
```
    Only ConfigObject and Config instances do anything in this method (they need to merge the fallback keys into themselves). All other values just return the original value, since they automatically override any fallback. This means that objects do not merge "across" non-objects; if you write object.withFallback(nonObject).withFallback(otherObject), then otherObject will simply be ignored. This is an intentional part of how merging works, because non-objects such as strings and integers replace (rather than merging with) any prior value:
```
 foo = { a: 42 }
 foo = 10
 
```
    Here, the number 10 "wins" and the value of foo would be simply 10. Again, for details see the spec.
    Specified by:
    
    withFallback in interface ConfigMergeable
    
    Parameters:
    
    other - an object whose keys should be used as fallbacks, if the keys are not present in this one
    
    Returns:
    
    a new object (or the original one, if the fallback doesn't get used)
  - resolve
```
resolve()
```
    Returns a replacement config with all substitutions (the ${foo.bar} syntax, see the spec) resolved. Substitutions are looked up using this Config as the root object, that is, a substitution ${foo.bar} will be replaced with the result of getValue("foo.bar").
    This method uses ConfigResolveOptions.defaults(), there is another variant resolve(ConfigResolveOptions) which lets you specify non-default options.
    A given Config must be resolved before using it to retrieve config values, but ideally should be resolved one time for your entire stack of fallbacks (see withFallback(com.typesafe.config.ConfigMergeable)). Otherwise, some substitutions that could have resolved with all fallbacks available may not resolve, which will be potentially confusing for your application's users.
    resolve() should be invoked on root config objects, rather than on a subtree (a subtree is the result of something like config.getConfig("foo")). The problem with resolve() on a subtree is that substitutions are relative to the root of the config and the subtree will have no way to get values from the root. For example, if you did config.getConfig("foo").resolve() on the below config file, it would not work:
```
   common-value = 10
   foo {
      whatever = ${common-value}
   }
 
```
    Many methods on ConfigFactory such as ConfigFactory.load() automatically resolve the loaded Config on the loaded stack of config files.
    Resolving an already-resolved config is a harmless no-op, but again, it is best to resolve an entire stack of fallbacks (such as all your config files combined) rather than resolving each one individually.
    Returns:
    
    an immutable object with substitutions resolved
    
    Throws:
    
    ConfigException.UnresolvedSubstitution - if any substitutions refer to nonexistent paths
    
    ConfigException - some other config exception if there are other problems
  - resolve
```
resolve(ConfigResolveOptions options)
```
    Like resolve() but allows you to specify non-default options.
    
    Parameters:
    
    options - resolve options
    
    Returns:
    
    the resolved Config (may be only partially resolved if options are set to allow unresolved)
  - isResolved
```
boolean isResolved()
```
    Checks whether the config is completely resolved. After a successful call to resolve() it will be completely resolved, but after calling resolve(ConfigResolveOptions) with allowUnresolved set in the options, it may or may not be completely resolved. A newly-loaded config may or may not be completely resolved depending on whether there were substitutions present in the file.
    
    Returns:
    
    true if there are no unresolved substitutions remaining in this configuration.
    
    Since:
    
    1.2.0
  - resolveWith
```
resolveWith(Config source)
```
    Like resolve() except that substitution values are looked up in the given source, rather than in this instance. This is a special-purpose method which doesn't make sense to use in most cases; it's only needed if you're constructing some sort of app-specific custom approach to configuration. The more usual approach if you have a source of substitution values would be to merge that source into your config stack using withFallback(com.typesafe.config.ConfigMergeable) and then resolve.
    Note that this method does NOT look in this instance for substitution values. If you want to do that, you could either merge this instance into your value source using withFallback(com.typesafe.config.ConfigMergeable), or you could resolve multiple times with multiple sources (using ConfigResolveOptions.setAllowUnresolved(boolean) so the partial resolves don't fail).
    
    Parameters:
    
    source - configuration to pull values from
    
    Returns:
    
    an immutable object with substitutions resolved
    
    Throws:
    
    ConfigException.UnresolvedSubstitution - if any substitutions refer to paths which are not in the source
    
    ConfigException - some other config exception if there are other problems
    
    Since:
    
    1.2.0
  - resolveWith
```
resolveWith(Config source,
                   ConfigResolveOptions options)
```
    Like resolveWith(Config) but allows you to specify non-default options.
    
    Parameters:
    
    source - source configuration to pull values from
    
    options - resolve options
    
    Returns:
    
    the resolved Config (may be only partially resolved if options are set to allow unresolved)
    
    Since:
    
    1.2.0
  - checkValid
```
void checkValid(Config reference,
                java.lang.String... restrictToPaths)
```
    Validates this config against a reference config, throwing an exception if it is invalid. The purpose of this method is to "fail early" with a comprehensive list of problems; in general, anything this method can find would be detected later when trying to use the config, but it's often more user-friendly to fail right away when loading the config.
    Using this method is always optional, since you can "fail late" instead.
    You must restrict validation to paths you "own" (those whose meaning are defined by your code module). If you validate globally, you may trigger errors about paths that happen to be in the config but have nothing to do with your module. It's best to allow the modules owning those paths to validate them. Also, if every module validates only its own stuff, there isn't as much redundant work being done.
    If no paths are specified in checkValid()'s parameter list, validation is for the entire config.
    If you specify paths that are not in the reference config, those paths are ignored. (There's nothing to validate.)
    Here's what validation involves:
    - All paths found in the reference config must be present in this config or an exception will be thrown.
    - Some changes in type from the reference config to this config will cause an exception to be thrown. Not all potential type problems are detected, in particular it's assumed that strings are compatible with everything except objects and lists. This is because string types are often "really" some other type (system properties always start out as strings, or a string like "5ms" could be used with getMilliseconds(java.lang.String)). Also, it's allowed to set any type to null or override null with any type.
    - Any unresolved substitutions in this config will cause a validation failure; both the reference config and this config should be resolved before validation. If the reference config is unresolved, it's a bug in the caller of this method.
    If you want to allow a certain setting to have a flexible type (or otherwise want validation to be looser for some settings), you could either remove the problematic setting from the reference config provided to this method, or you could intercept the validation exception and screen out certain problems. Of course, this will only work if all other callers of this method are careful to restrict validation to their own paths, as they should be.
    If validation fails, the thrown exception contains a list of all problems found. See ConfigException.ValidationFailed.problems. The exception's getMessage() will have all the problems concatenated into one huge string, as well.
    Again, checkValid() can't guess every domain-specific way a setting can be invalid, so some problems may arise later when attempting to use the config. checkValid() is limited to reporting generic, but common, problems such as missing settings and blatant type incompatibilities.
    Parameters:
    
    reference - a reference configuration
    
    restrictToPaths - only validate values underneath these paths that your code module owns and understands
    
    Throws:
    
    ConfigException.ValidationFailed - if there are any validation issues
    
    ConfigException.NotResolved - if this config is not resolved
    
    ConfigException.BugOrBroken - if the reference config is unresolved or caller otherwise misuses the API
  - hasPath
```
boolean hasPath(java.lang.String path)
```
    Checks whether a value is present and non-null at the given path. This differs in two ways from Map.containsKey() as implemented by ConfigObject: it looks for a path expression, not a key; and it returns false for null values, while containsKey() returns true indicating that the object contains a null value for the key.
    If a path exists according to hasPath(String), then getValue(String) will never throw an exception. However, the typed getters, such as getInt(String), will still throw if the value is not convertible to the requested type.
    Note that path expressions have a syntax and sometimes require quoting (see ConfigUtil.joinPath(java.lang.String...) and ConfigUtil.splitPath(java.lang.String)).
    
    Parameters:
    
    path - the path expression
    
    Returns:
    
    true if a non-null value is present at the path
    
    Throws:
    
    ConfigException.BadPath - if the path expression is invalid
  - hasPathOrNull
```
boolean hasPathOrNull(java.lang.String path)
```
    Checks whether a value is present at the given path, even if the value is null. Most of the getters on Config will throw if you try to get a null value, so if you plan to call getValue(String), getInt(String), or another getter you may want to use plain hasPath(String) rather than this method.
    To handle all three cases (unset, null, and a non-null value) the code might look like:
```
 if (config.hasPathOrNull(path)) {
     if (config.getIsNull(path)) {
        // handle null setting
     } else {
        // get and use non-null setting
     }
 } else {
     // handle entirely unset path
 }
 
```
    However, the usual thing is to allow entirely unset paths to be a bug that throws an exception (because you set a default in your reference.conf), so in that case it's OK to call getIsNull(String) without checking hasPathOrNull first.
    Note that path expressions have a syntax and sometimes require quoting (see ConfigUtil.joinPath(java.lang.String...) and ConfigUtil.splitPath(java.lang.String)).
    Parameters:
    
    path - the path expression
    
    Returns:
    
    true if a value is present at the path, even if the value is null
    
    Throws:
    
    ConfigException.BadPath - if the path expression is invalid
  - isEmpty
```
boolean isEmpty()
```
    Returns true if the Config's root object contains no key-value pairs.
    
    Returns:
    
    true if the configuration is empty
  - entrySet
```
java.util.Set<java.util.Map.Entry<java.lang.String,entrySet()
```
    Returns the set of path-value pairs, excluding any null values, found by recursing the root object. Note that this is very different from root().entrySet() which returns the set of immediate-child keys in the root object and includes null values.
    Entries contain path expressions meaning there may be quoting and escaping involved. Parse path expressions with ConfigUtil.splitPath(java.lang.String).
    Because a Config is conceptually a single-level map from paths to values, there will not be any ConfigObject values in the entries (that is, all entries represent leaf nodes). Use ConfigObject rather than Config if you want a tree. (OK, this is a slight lie: Config entries may contain ConfigList and the lists may contain objects. But no objects are directly included as entry values.)
    
    Returns:
    
    set of paths with non-null values, built up by recursing the entire tree of ConfigObject and creating an entry for each leaf value.
  - getIsNull
```
boolean getIsNull(java.lang.String path)
```
    Checks whether a value is set to null at the given path, but throws an exception if the value is entirely unset. This method will not throw if hasPathOrNull(String) returned true for the same path, so to avoid any possible exception check hasPathOrNull() first. However, an exception for unset paths will usually be the right thing (because a reference.conf should exist that has the path set, the path should never be unset unless something is broken).
    Note that path expressions have a syntax and sometimes require quoting (see ConfigUtil.joinPath(java.lang.String...) and ConfigUtil.splitPath(java.lang.String)).
    
    Parameters:
    
    path - the path expression
    
    Returns:
    
    true if the value exists and is null, false if it exists and is not null
    
    Throws:
    
    ConfigException.BadPath - if the path expression is invalid
    
    ConfigException.Missing - if value is not set at all
  - getBoolean
```
boolean getBoolean(java.lang.String path)
```
    Parameters:
    
    path - path expression
    
    Returns:
    
    the boolean value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to boolean
  - getNumber
```
java.lang.Number getNumber(java.lang.String path)
```
    Parameters:
    
    path - path expression
    
    Returns:
    
    the numeric value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a number
  - getInt
```
int getInt(java.lang.String path)
```
    Gets the integer at the given path. If the value at the path has a fractional (floating point) component, it will be discarded and only the integer part will be returned (it works like a "narrowing primitive conversion" in the Java language specification).
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the 32-bit integer value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to an int (for example it is out of range, or it's a boolean value)
  - getLong
```
long getLong(java.lang.String path)
```
    Gets the long integer at the given path. If the value at the path has a fractional (floating point) component, it will be discarded and only the integer part will be returned (it works like a "narrowing primitive conversion" in the Java language specification).
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the 64-bit long value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a long
  - getDouble
```
double getDouble(java.lang.String path)
```
    Parameters:
    
    path - path expression
    
    Returns:
    
    the floating-point value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a double
  - getString
```
java.lang.String getString(java.lang.String path)
```
    Parameters:
    
    path - path expression
    
    Returns:
    
    the string value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a string
  - getEnum
```
<T extends java.lang.Enum<T>> T getEnum(java.lang.Class<T> enumClass,
                                        java.lang.String path)
```
    Type Parameters:
    
    T - a generic denoting a specific type of enum
    
    Parameters:
    
    enumClass - an enum class
    
    path - path expression
    
    Returns:
    
    the Enum value at the requested path of the requested enum class
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to an Enum
  - getObject
```
getObject(java.lang.String path)
```
    Parameters:
    
    path - path expression
    
    Returns:
    
    the ConfigObject value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to an object
  - getConfig
```
getConfig(java.lang.String path)
```
    Parameters:
    
    path - path expression
    
    Returns:
    
    the nested Config value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a Config
  - getAnyRef
```
java.lang.Object getAnyRef(java.lang.String path)
```
    Gets the value at the path as an unwrapped Java boxed value ( Boolean, Integer, and so on - see ConfigValue.unwrapped()).
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the unwrapped value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
  - getValue
```
getValue(java.lang.String path)
```
    Gets the value at the given path, unless the value is a null value or missing, in which case it throws just like the other getters. Use get() on the root() object (or other object in the tree) if you want an unprocessed value.
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
  - getBytes
```
java.lang.Long getBytes(java.lang.String path)
```
    Gets a value as a size in bytes (parses special strings like "128M"). If the value is already a number, then it's left alone; if it's a string, it's parsed understanding unit suffixes such as "128K", as documented in the the spec.
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the value at the requested path, in bytes
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to Long or String
    
    ConfigException.BadValue - if value cannot be parsed as a size in bytes
  - getMemorySize
```
getMemorySize(java.lang.String path)
```
    Gets a value as an amount of memory (parses special strings like "128M"). If the value is already a number, then it's left alone; if it's a string, it's parsed understanding unit suffixes such as "128K", as documented in the the spec.
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the value at the requested path, in bytes
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to Long or String
    
    ConfigException.BadValue - if value cannot be parsed as a size in bytes
    
    Since:
    
    1.3.0
  - getMilliseconds
```
@Deprecated
java.lang.Long getMilliseconds(java.lang.String path)
```
    Deprecated. As of release 1.1, replaced by getDuration(String, TimeUnit)
    
    Get value as a duration in milliseconds. If the value is already a number, then it's left alone; if it's a string, it's parsed understanding units suffixes like "10m" or "5ns" as documented in the the spec.
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the duration value at the requested path, in milliseconds
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to Long or String
    
    ConfigException.BadValue - if value cannot be parsed as a number of milliseconds
  - getNanoseconds
```
@Deprecated
java.lang.Long getNanoseconds(java.lang.String path)
```
    Deprecated. As of release 1.1, replaced by getDuration(String, TimeUnit)
    
    Get value as a duration in nanoseconds. If the value is already a number it's taken as milliseconds and converted to nanoseconds. If it's a string, it's parsed understanding unit suffixes, as for getDuration(String, TimeUnit).
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the duration value at the requested path, in nanoseconds
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to Long or String
    
    ConfigException.BadValue - if value cannot be parsed as a number of nanoseconds
  - getDuration
```
long getDuration(java.lang.String path,
                 java.util.concurrent.TimeUnit unit)
```
    Gets a value as a duration in a specified TimeUnit. If the value is already a number, then it's taken as milliseconds and then converted to the requested TimeUnit; if it's a string, it's parsed understanding units suffixes like "10m" or "5ns" as documented in the the spec.
    
    Parameters:
    
    path - path expression
    
    unit - convert the return value to this time unit
    
    Returns:
    
    the duration value at the requested path, in the given TimeUnit
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to Long or String
    
    ConfigException.BadValue - if value cannot be parsed as a number of the given TimeUnit
    
    Since:
    
    1.2.0
  - getDuration
```
java.time.Duration getDuration(java.lang.String path)
```
    Gets a value as a java.time.Duration. If the value is already a number, then it's taken as milliseconds; if it's a string, it's parsed understanding units suffixes like "10m" or "5ns" as documented in the the spec. This method never returns null.
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the duration value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to Long or String
    
    ConfigException.BadValue - if value cannot be parsed as a number of the given TimeUnit
    
    Since:
    
    1.3.0
  - getPeriod
```
java.time.Period getPeriod(java.lang.String path)
```
    Gets a value as a java.time.Period. If the value is already a number, then it's taken as days; if it's a string, it's parsed understanding units suffixes like "10d" or "5w" as documented in the the spec. This method never returns null.
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the period value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to Long or String
    
    ConfigException.BadValue - if value cannot be parsed as a number of the given TimeUnit
    
    Since:
    
    1.3.0
  - getTemporal
```
java.time.temporal.TemporalAmount getTemporal(java.lang.String path)
```
    Gets a value as a java.time.temporal.TemporalAmount. This method will first try get get the value as a java.time.Duration, and if unsuccessful, then as a java.time.Period. This means that values like "5m" will be parsed as 5 minutes rather than 5 months
    
    Parameters:
    
    path - path expression
    
    Returns:
    
    the temporal value at the requested path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to Long or String
    
    ConfigException.BadValue - if value cannot be parsed as a TemporalAmount
  - getList
```
getList(java.lang.String path)
```
    Gets a list value (with any element type) as a ConfigList, which implements java.util.List<ConfigValue>. Throws if the path is unset or null.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the ConfigList at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a ConfigList
  - getBooleanList
```
java.util.List<java.lang.Boolean> getBooleanList(java.lang.String path)
```
    Gets a list value with boolean elements. Throws if the path is unset or null or not a list or contains values not convertible to boolean.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of booleans
  - getNumberList
```
java.util.List<java.lang.Number> getNumberList(java.lang.String path)
```
    Gets a list value with number elements. Throws if the path is unset or null or not a list or contains values not convertible to number.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of numbers
  - getIntList
```
java.util.List<java.lang.Integer> getIntList(java.lang.String path)
```
    Gets a list value with int elements. Throws if the path is unset or null or not a list or contains values not convertible to int.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of ints
  - getLongList
```
java.util.List<java.lang.Long> getLongList(java.lang.String path)
```
    Gets a list value with long elements. Throws if the path is unset or null or not a list or contains values not convertible to long.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of longs
  - getDoubleList
```
java.util.List<java.lang.Double> getDoubleList(java.lang.String path)
```
    Gets a list value with double elements. Throws if the path is unset or null or not a list or contains values not convertible to double.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of doubles
  - getStringList
```
java.util.List<java.lang.String> getStringList(java.lang.String path)
```
    Gets a list value with string elements. Throws if the path is unset or null or not a list or contains values not convertible to string.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of strings
  - getEnumList
```
<T extends java.lang.Enum<T>> java.util.List<T> getEnumList(java.lang.Class<T> enumClass,
                                                            java.lang.String path)
```
    Gets a list value with Enum elements. Throws if the path is unset or null or not a list or contains values not convertible to Enum.
    
    Type Parameters:
    
    T - a generic denoting a specific type of enum
    
    Parameters:
    
    enumClass - the enum class
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of Enum
  - getObjectList
```
java.util.List<? extends getObjectList(java.lang.String path)
```
    Gets a list value with object elements. Throws if the path is unset or null or not a list or contains values not convertible to ConfigObject.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of objects
  - getConfigList
```
java.util.List<? extends getConfigList(java.lang.String path)
```
    Gets a list value with Config elements. Throws if the path is unset or null or not a list or contains values not convertible to Config.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of configs
  - getAnyRefList
```
java.util.List<? extends java.lang.Object> getAnyRefList(java.lang.String path)
```
    Gets a list value with any kind of elements. Throws if the path is unset or null or not a list. Each element is "unwrapped" (see ConfigValue.unwrapped()).
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list
  - getBytesList
```
java.util.List<java.lang.Long> getBytesList(java.lang.String path)
```
    Gets a list value with elements representing a size in bytes. Throws if the path is unset or null or not a list or contains values not convertible to memory sizes.
    
    Parameters:
    
    path - the path to the list value.
    
    Returns:
    
    the list at the path
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of memory sizes
  - getMemorySizeList
```
java.util.List<getMemorySizeList(java.lang.String path)
```
    Gets a list, converting each value in the list to a memory size, using the same rules as getMemorySize(String).
    
    Parameters:
    
    path - a path expression
    
    Returns:
    
    list of memory sizes
    
    Throws:
    
    ConfigException.Missing - if value is absent or null
    
    ConfigException.WrongType - if value is not convertible to a list of memory sizes
    
    Since:
    
    1.3.0
  - getMillisecondsList
```
@Deprecated
java.util.List<java.lang.Long> getMillisecondsList(java.lang.String path)
```
    Deprecated. As of release 1.1, replaced by getDurationList(String, TimeUnit)
    
    Parameters:
    
    path - the path
    
    Returns:
    
    list of millisecond values
  - getNanosecondsList
```
@Deprecated
java.util.List<java.lang.Long> getNanosecondsList(java.lang.String path)
```
    Deprecated. As of release 1.1, replaced by getDurationList(String, TimeUnit)
    
    Parameters:
    
    path - the path
    
    Returns:
    
    list of nanosecond values
  - getDurationList
```
java.util.List<java.lang.Long> getDurationList(java.lang.String path,
                                               java.util.concurrent.TimeUnit unit)
```
    Gets a list, converting each value in the list to a duration, using the same rules as getDuration(String, TimeUnit).
    
    Parameters:
    
    path - a path expression
    
    unit - time units of the returned values
    
    Returns:
    
    list of durations, in the requested units
    
    Since:
    
    1.2.0
  - getDurationList
```
java.util.List<java.time.Duration> getDurationList(java.lang.String path)
```
    Gets a list, converting each value in the list to a duration, using the same rules as getDuration(String).
    
    Parameters:
    
    path - a path expression
    
    Returns:
    
    list of durations
    
    Since:
    
    1.3.0
  - withOnlyPath
```
withOnlyPath(java.lang.String path)
```
    Clone the config with only the given path (and its children) retained; all sibling paths are removed.
    Note that path expressions have a syntax and sometimes require quoting (see ConfigUtil.joinPath(java.lang.String...) and ConfigUtil.splitPath(java.lang.String)).
    
    Parameters:
    
    path - path to keep
    
    Returns:
    
    a copy of the config minus all paths except the one specified
  - withoutPath
```
withoutPath(java.lang.String path)
```
    Clone the config with the given path removed.
    Note that path expressions have a syntax and sometimes require quoting (see ConfigUtil.joinPath(java.lang.String...) and ConfigUtil.splitPath(java.lang.String)).
    
    Parameters:
    
    path - path expression to remove
    
    Returns:
    
    a copy of the config minus the specified path
  - atPath
```
atPath(java.lang.String path)
```
    Places the config inside another Config at the given path.
    Note that path expressions have a syntax and sometimes require quoting (see ConfigUtil.joinPath(java.lang.String...) and ConfigUtil.splitPath(java.lang.String)).
    
    Parameters:
    
    path - path expression to store this config at.
    
    Returns:
    
    a Config instance containing this config at the given path.
  - atKey
```
atKey(java.lang.String key)
```
    Places the config inside a Config at the given key. See also atPath(). Note that a key is NOT a path expression (see ConfigUtil.joinPath(java.lang.String...) and ConfigUtil.splitPath(java.lang.String)).
    
    Parameters:
    
    key - key to store this config at.
    
    Returns:
    
    a Config instance containing this config at the given key.
  - withValue
```
withValue(java.lang.String path,
                 ConfigValue value)
```
    Returns a Config based on this one, but with the given path set to the given value. Does not modify this instance (since it's immutable). If the path already has a value, that value is replaced. To remove a value, use withoutPath().
    Note that path expressions have a syntax and sometimes require quoting (see ConfigUtil.joinPath(java.lang.String...) and ConfigUtil.splitPath(java.lang.String)).
    
    Parameters:
    
    path - path expression for the value's new location
    
    value - value at the new path
    
    Returns:
    
    the new instance with the new map entry

Interface Config

Method Summary

Method Detail

root

origin

withFallback

resolve

resolve

isResolved

resolveWith

resolveWith

checkValid

hasPath

hasPathOrNull

isEmpty

entrySet

getIsNull

getBoolean

getNumber

getInt

getLong

getDouble

getString

getEnum

getObject

getConfig

getAnyRef

getValue

getBytes

getMemorySize

getMilliseconds

getNanoseconds

getDuration

getDuration

getPeriod

getTemporal

getList

getBooleanList

getNumberList

getIntList

getLongList

getDoubleList

getStringList

getEnumList

getObjectList

getConfigList

getAnyRefList

getBytesList

getMemorySizeList

getMillisecondsList

getNanosecondsList

getDurationList

getDurationList

withOnlyPath

withoutPath

atPath

atKey

withValue