Class ReflectiveLoadTimeWeaver

All Implemented Interfaces:

public class ReflectiveLoadTimeWeaver extends Object implements LoadTimeWeaver
LoadTimeWeaver which uses reflection to delegate to an underlying ClassLoader with well-known transformation hooks. The underlying ClassLoader is expected to support the following weaving methods (as defined in the LoadTimeWeaver interface):
  • public void addTransformer(java.lang.instrument.ClassFileTransformer): for registering the given ClassFileTransformer on this ClassLoader
  • public ClassLoader getThrowawayClassLoader(): for obtaining a throwaway class loader for this ClassLoader (optional; ReflectiveLoadTimeWeaver will fall back to a SimpleThrowawayClassLoader if that method isn't available)

Please note that the above methods must reside in a class that is publicly accessible, although the class itself does not have to be visible to the application's class loader.

The reflective nature of this LoadTimeWeaver is particularly useful when the underlying ClassLoader implementation is loaded in a different class loader itself (such as the application server's class loader which is not visible to the web application). There is no direct API dependency between this LoadTimeWeaver adapter and the underlying ClassLoader, just a 'loose' method contract.

This is the LoadTimeWeaver to use e.g. with the Resin application server version 3.1+.

Costin Leau, Juergen Hoeller
See Also:
  • Constructor Details

    • ReflectiveLoadTimeWeaver

      public ReflectiveLoadTimeWeaver()
      Create a new ReflectiveLoadTimeWeaver for the current context class loader, which needs to support the required weaving methods.
    • ReflectiveLoadTimeWeaver

      public ReflectiveLoadTimeWeaver(@Nullable ClassLoader classLoader)
      Create a new SimpleLoadTimeWeaver for the given class loader.
      classLoader - the ClassLoader to delegate to for weaving (must support the required weaving methods).
      IllegalStateException - if the supplied ClassLoader does not support the required weaving methods
  • Method Details