1   package com.atlassian.plugins.rest.module;
2   
3   import java.lang.reflect.InvocationHandler;
4   import java.lang.reflect.InvocationTargetException;
5   import java.lang.reflect.Method;
6   
7   public class ContextClassLoaderSwitchingProxy implements InvocationHandler
8   {
9       private final Object delegate;
10      private final ClassLoader[] classLoaders;
11  
12      public ContextClassLoaderSwitchingProxy(final Object delegate, final ClassLoader... classLoaders)
13      {
14          this.delegate = delegate;
15          this.classLoaders = classLoaders;
16      }
17  
18      public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable
19      {
20          ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
21          ChainingClassLoader chainingClassLoader = new ChainingClassLoader(classLoaders);
22          try
23          {
24              try
25              {
26                  Thread.currentThread().setContextClassLoader(chainingClassLoader);
27                  return method.invoke(delegate, args);
28              }
29              catch (InvocationTargetException e)
30              {
31                  throw e.getCause();
32              }
33          }
34          finally
35          {
36              Thread.currentThread().setContextClassLoader(oldClassLoader);
37          }
38  
39      }
40  
41  }