The Spring Framework

## org.springframework.core
Class LocalVariableTableParameterNameDiscoverer

    java.lang.Object
      org.springframework.core.LocalVariableTableParameterNameDiscoverer

All Implemented Interfaces:
  ParameterNameDiscoverer

    public class LocalVariableTableParameterNameDiscoverer

extends Object
implements ParameterNameDiscoverer

Implementation of `ParameterNameDiscoverer` that uses the LocalVariableTable information in the method attributes to discover parameter names. Returns `null` if the class file was compiled without debug information.

Uses ObjectWeb's ASM library for analyzing class files. Each discoverer instance caches the ASM ClassReader for each introspected Class, in a thread-safe manner. It is recommended to reuse discoverer instances as far as possible.

Since:
  2.0
Author:
  Adrian Colyer, Juergen Hoeller

Constructor Summary
`LocalVariableTableParameterNameDiscoverer()`

Method Summary
`String[]` `getParameterNames(Constructor ctor)` Return parameter names for this constructor, or `null` if they cannot be determined.
`String[]` `getParameterNames(Method method)` Return parameter names for this method, or `null` if they cannot be determined.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### LocalVariableTableParameterNameDiscoverer

    public LocalVariableTableParameterNameDiscoverer()

Method Detail

### getParameterNames

    public String[] getParameterNames(Method method)

  Description copied from interface: `ParameterNameDiscoverer`
  Return parameter names for this method, or `null` if they cannot be determined.

  Specified by:
    `getParameterNames` in interface `ParameterNameDiscoverer`
  Parameters:
    `method` - method to find parameter names for
  Returns:
    an array of parameter names if the names can be resolved, or `null` if they cannot

### getParameterNames

    public String[] getParameterNames(Constructor ctor)

  Description copied from interface: `ParameterNameDiscoverer`
  Return parameter names for this constructor, or `null` if they cannot be determined.

  Specified by:
    `getParameterNames` in interface `ParameterNameDiscoverer`
  Parameters:
    `ctor` - constructor to find parameter names for
  Returns:
    an array of parameter names if the names can be resolved, or `null` if they cannot

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