Skip to content
Utility methods for fetching Java method or constructor parameter names
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.

Parameter Names

Maven Central Build Status

Parameter Names contains utility methods for fetching the parameter names for a method or constructor.

Java 8 added the ability to access the parameter names of a method or constructor, but this only works if the code was compiled with the Java 8 version of javac with the -parameters option enabled. This utility falls back to reading parameters from the debug symbols in the method bytecode for classes compiled without the -parameters option enabled. Note that this fallback will not work for interfaces, as interface methods do not have bytecode and thus do not have debug symbols.


Simply, pass java.lang.reflect.Method or java.lang.reflect.Constructor to ParameterNames.getParameterNames. For example:

    Method method = ParameterNames.class.getMethod("getParameterNames", Executable.class);
    List<String> parameterNames = ParameterNames.getParameterNames(method);

Parameter names are loaded in the following order:

  1. Java 8 reflection names created by javac with the -parameters option
  2. Bytecode debug symbols created by javac with the -g option
  3. Default name of argN where N is the index of the parameter starting from zero

Maven Dependency



Parameter Names is released under the Apache License, Version 2.0.

You can’t perform that action at this time.