The test case is mirrored after a real-world Map impl from Guava:

map = com.google.common.cache.CacheBuilder.new_builder.build.as_map 
# map is an instance of: Java::ComGoogleCommonCache::LocalCache
map.compute(:foo) { |_, value| 42 }

leading to a false-positive warning:

(RuntimeError) multiple Java methods found, dumping backtrace and choosing compute(java.lang.Object,java.util.function.BiFunction)

upon inspection of the CallableSelector there were 2 methods:

• public default java.lang.Object java.util.concurrent.ConcurrentMap.compute(java.lang.Object,java.util.function.BiFunction)
• public default java.lang.Object java.util.Map.compute(java.lang.Object,java.util.function.BiFunction)]