[GROOVY-3463] Spring/CGLIB proxies throw exception "object is not an instance of declaring class"

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.6, 1.6.1
• Fix Version/s: 1.7.5, 1.8-beta-2
• Environment: Windows XP, JDK 1.6
• Assignee: Guillaume Sauthier
• Reporter: Christopher Wong
• Created: 09/Apr/09 13:13
• Updated: 15/Dec/10 22:19
• Resolved: 15/Sep/10 08:23

Description

Groovy classes wrapped by Spring (CGLIB scoped proxies) throw an exception "object is not an instance of declaring class" when accessed. This behavior does not happen with Groovy 1.5.8. I have attached a test case.

Instructions for test case: this is a zip of an IDEA project to build a minimal Spring web app. The real action is in src/gtest/RegularBean.groovy, which invokes a scoped proxy. This zip archive is complete except for a bunch of jars I left out to keep the size down. See lib/filelist.txt for the list of jars that should be copied into that dir. To build, run "ant" in the GroovyTest dir. To build the war, run "ant j2ee.build.jar.groovytestweb".

To reproduce, deploy the webapp and open index.html with your browser. For example:

http://localhost:8080/groovytest/index.html

The exception should display in the browser window. It should look like the following:

java.lang.IllegalArgumentException: object is not an instance of declaring class
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:86)
groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:234)
groovy.lang.MetaClassImpl.setProperty(MetaClassImpl.java:2402)
groovy.lang.MetaClassImpl.setProperty(MetaClassImpl.java:3307)
gtest.ParentBean.setProperty(ParentBean.groovy)
gtest.ParentBean$$FastClassByCGLIB$$6043f72f.invoke(<generated>)
net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:696)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:631)
gtest.SessionScopedBean$$EnhancerByCGLIB$$d8ea54c.setProperty(<generated>)
org.codehaus.groovy.runtime.ScriptBytecodeAdapter.setGroovyObjectProperty(ScriptBytecodeAdapter.java:530)
gtest.RegularBean.doStuff(RegularBean.groovy:10)
gtest.RegularBeanIf$doStuff.call(Unknown Source)
gtest.HomePageController.handleRequestInternal(HomePageController.groovy:15)
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:859)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:793)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:476)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:431)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)