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[java] Rescuing the remote cause for session creation errors#16418

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diemol merged 3 commits intotrunkfrom
rescue_remote_cause
Oct 13, 2025
Merged

[java] Rescuing the remote cause for session creation errors#16418
diemol merged 3 commits intotrunkfrom
rescue_remote_cause

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@diemol diemol commented Oct 13, 2025 •
edited by qodo-code-review bot
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User description

🔗 Related Issues

Fixes #16388

💥 What does this PR do?

Every now and then, someone complains because the real reason a remote session creation fails is hidden in the stack trace. This identifies the cause, if it exists, and displays it at the top level.

PR Type

Bug fix

Description

  • Improved error messaging for remote session creation failures

  • Extracts and displays the underlying cause message at the top level

  • Prevents real error reasons from being hidden in stack traces

Diagram Walkthrough

flowchart LR
  A["Session Creation Error"] --> B["Check for Cause"]
  B --> C["Extract Cause Message"]
  C --> D["Display at Top Level"]
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File Walkthrough
Relevant files
Bug fix
RemoteWebDriver.java
Enhanced remote session error message extraction                 

java/src/org/openqa/selenium/remote/RemoteWebDriver.java

  • Enhanced error handling in execute() method for NEW_SESSION command
  • Extracts cause message from exception chain when available
  • Appends cause message to SessionNotCreatedException for better
    visibility
 +5/-1     

@selenium-ci selenium-ci added the C-java Java Bindings label Oct 13, 2025
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qodo-code-review bot commented Oct 13, 2025 •
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PR Compliance Guide 🔍

Below is a summary of compliance checks for this PR:

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No security concerns identified No security vulnerabilities detected by AI analysis. Human verification advised for critical code.
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@diemol diemol mentioned this pull request Oct 13, 2025
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qodo-code-review bot commented Oct 13, 2025 •
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PR Code Suggestions ✨

Explore these optional code suggestions:

CategorySuggestion                                                                                                                                    Impact
Possible issue
Prevent "null" in exception message

Replace e.getCause().getMessage() with e.getCause().toString() to prevent a
literal "null" from appearing in the exception message if the cause's message is
null.

java/src/org/openqa/selenium/remote/RemoteWebDriver.java [575-583]

 // When this exception comes from a remote end, the real cause is usually hidden in the
 // cause. Let's try to rescue it and display it at the top level.
-String cause = e.getCause() != null ? e.getCause().getMessage() : "";
+String cause = e.getCause() != null ? e.getCause().toString() : "";
 toThrow =
     new SessionNotCreatedException(
         "Possible causes are invalid address of the remote server or browser start-up"
             + " failure. "
             + cause,
         e);
  • Apply / Chat
Suggestion importance[1-10]: 6

__

Why: The suggestion correctly identifies that e.getCause().getMessage() can return null, which would result in a confusing error message. Using e.getCause().toString() is a more robust approach that improves the quality of the error handling introduced in this PR.

Low
  • Update

valfirst
valfirst reviewed Oct 13, 2025
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@diemol diemol merged commit d66494e into trunk Oct 13, 2025
46 of 47 checks passed
@diemol diemol deleted the rescue_remote_cause branch October 13, 2025 19:49
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@titusfortner titusfortner titusfortner approved these changes

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@valfirst valfirst valfirst left review comments

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Successfully merging this pull request may close these issues.

[🐛 Bug]: [java] No proper error message misleading the user to analyze

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@diemol @titusfortner @valfirst @selenium-ci