access target behind spring proxy

gistfile1.java

// from http://www.techper.net/2009/06/05/how-to-acess-target-object-behind-a-spring-proxy/

@SuppressWarnings({"unchecked"})
protected <T> T getTargetObject(Object proxy, Class<T> targetClass) throws Exception {
  if (AopUtils.isJdkDynamicProxy(proxy)) {
    return (T) ((Advised)proxy).getTargetSource().getTarget();
  } else {
    return (T) proxy; // expected to be cglib proxy then, which is simply a specialized class
  }
}

// alternative for a proxied MultiResourceItemReader, beware works only if you configure StepScope with
// <bean class="org.springframework.batch.core.scope.StepScope" p:proxyTargetClass="true" />

if (proxy instanceof Advised) {
    try {
        Advised advised = (Advised) proxy;
        Object obj = advised.getTargetSource().getTarget();
        MultiResourceItemReader mrirTarget = (MultiResourceItemReader) obj;
        // ... usage
    } catch (Exception ex) {
        throw new RuntimeException(ex);
    }
}

Object target = AopProxyUtils.getSingletonTarget(proxy);