Program: 3888
Project: 3888
Buggy source:
/** 
 * @param serviceInterface client interface
 * @param serviceName      client name
 * @param returnAddressArg specify a specific return address
 * @param < T >              class type of client interface
 * @return proxy object
 */
public <T>T createProxy(final Class<T> serviceInterface,final String serviceName,final String returnAddressArg){
  if (!serviceInterface.isInterface()) {
    die("String_Node_Str");
  }
  BeforeMethodCall beforeMethodCall=new BeforeMethodCall(){
    @Override public boolean before(    final MethodCall call){
      final Object body=call.body();
      if (body instanceof Object[]) {
        Object[] list=(Object[])body;
        if (list.length > 0) {
          final Object o=list[0];
          if (o instanceof Callback) {
            handlers.put(new HandlerKey(call.returnAddress(),call.id()),createHandler(serviceInterface,call,(Callback)o));
            if (list.length - 1 == 0) {
              list=new Object[0];
            }
 else {
              list=Arry.slc(list,1);
            }
          }
          if (call instanceof MethodCallImpl) {
            MethodCallImpl impl=(MethodCallImpl)call;
            impl.setBody(list);
          }
        }
      }
      return true;
    }
  }
;
  T proxy=QBit.factory().createRemoteProxyWithReturnAddress(serviceInterface,uri,serviceName,returnAddressArg,(returnAddress,buffer) -> BoonClient.this.send(serviceName,buffer),beforeMethodCall,requestBatchSize);
  if (proxy instanceof ClientProxy) {
    clientProxies.add((ClientProxy)proxy);
  }
  return proxy;
}

Fixed version (ground truth):
/** 
 * @param serviceInterface client interface
 * @param serviceName      client name
 * @param returnAddressArg specify a specific return address
 * @param < T >              class type of client interface
 * @return proxy object
 */
public <T>T createProxy(final Class<T> serviceInterface,final String serviceName,final String returnAddressArg){
  if (!serviceInterface.isInterface()) {
    die("String_Node_Str");
  }
  BeforeMethodCall beforeMethodCall=new BeforeMethodCall(){
    @Override public boolean before(    final MethodCall call){
      final Object body=call.body();
      if (body instanceof Object[]) {
        Object[] list=(Object[])body;
        if (list.length > 0) {
          final Object o=list[0];
          if (o instanceof Callback) {
            handlers.put(new HandlerKey(call.returnAddress(),call.id()),createHandler(serviceInterface,call,(Callback)o));
            if (list.length - 1 == 0) {
              list=new Object[0];
            }
 else {
              list=Arry.slc(list,1);
            }
          }
          if (call instanceof MethodCallImpl) {
            MethodCallImpl impl=(MethodCallImpl)call;
            impl.setBody(list);
          }
        }
      }
      return true;
    }
  }
;
  T proxy=QBit.factory().createRemoteProxyWithReturnAddress(serviceInterface,uri,serviceName,httpServerProxy.getHost(),httpServerProxy.getPort(),returnAddressArg,(returnAddress,buffer) -> BoonClient.this.send(serviceName,buffer),beforeMethodCall,requestBatchSize);
  if (proxy instanceof ClientProxy) {
    clientProxies.add((ClientProxy)proxy);
  }
  return proxy;
}