Struts2中为Action的List属性赋值问题揭秘

      话说“天降大任于斯人也，必先苦其心志，劳其筋骨，饿其体肤”，同样，要想更深入的掌握一项技术，必先对其有持久的耐性，然后有遇见问题必解决问题的决心。废话少说，直接贴出异常：

java.rmi.RemoteException: EJB Exception: ; nested exception is:
        java.lang.RuntimeException: Unexpected Exception
        at weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:20
5)
        at weblogic.rmi.cluster.ClusterableRemoteRef.invoke(ClusterableRemoteRef
.java:335)
        at weblogic.rmi.cluster.ClusterableRemoteRef.invoke(ClusterableRemoteRef
.java:252)
        at net.htjs.service.ejb.xtzc.XtZc_q4cz52_EOImpl_923_WLStub.makeRegister(
Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.springframework.remoting.rmi.RmiClientInterceptorUtils.doInvoke(R
miClientInterceptorUtils.java:102)
        at org.springframework.ejb.access.SimpleRemoteSlsbInvokerInterceptor.doI
nvoke(SimpleRemoteSlsbInvokerInterceptor.java:75)
        at org.springframework.ejb.access.AbstractRemoteSlsbInvokerInterceptor.i
nvoke(AbstractRemoteSlsbInvokerInterceptor.java:119)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:166)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynami
cAopProxy.java:204)
        at $Proxy37.makeRegister(Unknown Source)
        at net.htjs.web.actions.XtzcAction.doRegister(XtzcAction.java:128)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultA
ctionInvocation.java:404)
        at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(Defa
ultActionInvocation.java:267)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:229)
        at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doInte
rcept(DefaultWorkflowInterceptor.java:221)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept
(MethodFilterInterceptor.java:86)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(V
alidationInterceptor.java:150)
        at org.apache.struts2.interceptor.validation.AnnotationValidationInterce
ptor.doIntercept(AnnotationValidationInterceptor.java:48)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept
(MethodFilterInterceptor.java:86)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.interc
ept(ConversionErrorInterceptor.java:123)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept
(ParametersInterceptor.java:167)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept
(MethodFilterInterceptor.java:86)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.inter
cept(StaticParametersInterceptor.java:105)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(Checkbox
Interceptor.java:83)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUp
loadInterceptor.java:207)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(
ModelDrivenInterceptor.java:74)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.inte
rcept(ScopedModelDrivenInterceptor.java:127)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at org.apache.struts2.interceptor.ProfilingActivationInterceptor.interce
pt(ProfilingActivationInterceptor.java:107)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.interce
pt(DebuggingInterceptor.java:206)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(Cha
iningInterceptor.java:115)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInt
erceptor.java:143)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(Pr
epareInterceptor.java:121)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept
(MethodFilterInterceptor.java:86)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(Ser
vletConfigInterceptor.java:170)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasI
nterceptor.java:123)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.inter
cept(ExceptionMappingInterceptor.java:176)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:224)
        at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(Default
ActionInvocation.java:223)
        at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTim
erStack.java:455)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionI
nvocation.java:221)
        at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.j
ava:50)
        at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.jav
a:504)
        at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatc
her.java:419)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.ja
va:42)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationActio
n.run(WebAppServletContext.java:3242)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Authenticate
dSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:
121)
        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppS
ervletContext.java:2010)
        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletC
ontext.java:1916)
        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.j
ava:1366)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)
Caused by: java.lang.RuntimeException: Unexpected Exception
        at weblogic.rmi.extensions.RemoteRuntimeException.writeReplace(RemoteRun
timeException.java:38)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:1
004)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1036)

        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java
:1375)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:13
47)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav
a:1290)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)

        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
        at weblogic.rmi.extensions.server.CBVOutputStream.writeObject(CBVOutputS
tream.java:91)
        at weblogic.rmi.internal.ServerRequest.unmarshalThrowable(ServerRequest.
java:349)
        at weblogic.rmi.internal.ServerRequest.getThrowable(ServerRequest.java:6
2)
        at weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:20
3)
        ... 123 more
Caused by: java.lang.ClassNotFoundException: com.opensymphony.xwork2.util.XWorkL
ist:  This error could indicate that a component was deployed on a  cluster memb
er but not other members of that cluster. Make sure that any component deployed
on a server that is part of a cluster is also deployed on all other members of t
hat cluster
        at weblogic.j2ee.ApplicationManager.loadClass(ApplicationManager.java:21
8)
        at weblogic.j2ee.ApplicationManager.loadClass(ApplicationManager.java:85
)
        at weblogic.common.internal.WLObjectInputStream.resolveClass(WLObjectInp
utStream.java:61)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:154
4)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
699)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:19
08)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)

        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
719)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
        at weblogic.rmi.extensions.server.CBVInputStream.readObject(CBVInputStre
am.java:55)
        at weblogic.rmi.internal.ServerRequest.copy(ServerRequest.java:261)
        at weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:16
6)
        at weblogic.rmi.cluster.ClusterableRemoteRef.invoke(ClusterableRemoteRef
.java:335)
        at weblogic.rmi.cluster.ClusterableRemoteRef.invoke(ClusterableRemoteRef
.java:252)
        at net.htjs.service.ejb.system.GaSystem_6uq8bi_EOImpl_923_WLStub.insertX
T_USER(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.springframework.remoting.rmi.RmiClientInterceptorUtils.doInvoke(R
miClientInterceptorUtils.java:102)
        at org.springframework.ejb.access.SimpleRemoteSlsbInvokerInterceptor.doI
nvoke(SimpleRemoteSlsbInvokerInterceptor.java:75)
        at org.springframework.ejb.access.AbstractRemoteSlsbInvokerInterceptor.i
nvoke(AbstractRemoteSlsbInvokerInterceptor.java:119)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:166)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynami
cAopProxy.java:204)
        at $Proxy57.insertXT_USER(Unknown Source)
        at net.htjs.service.bo.xtzc.impl.IBoXT_ZCXXImpl.makeRegister(IBoXT_ZCXXI
mpl.java:182)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflecti
on(AopUtils.java:296)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJo
inpoint(ReflectiveMethodInvocation.java:177)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:144)
        at org.springframework.transaction.interceptor.TransactionInterceptor.in
voke(TransactionInterceptor.java:107)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:166)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynami
cAopProxy.java:204)
        at $Proxy59.makeRegister(Unknown Source)
        at net.htjs.service.ejb.xtzc.XtZcBean.makeRegister(XtZcBean.java:227)
        at net.htjs.service.ejb.xtzc.XtZc_q4cz52_EOImpl.makeRegister(XtZc_q4cz52
_EOImpl.java:71)
        at net.htjs.service.ejb.xtzc.XtZc_q4cz52_EOImpl_WLSkel.invoke(Unknown So
urce)
        at weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:17
4)
        ... 123 more

    

      从异常信息中，很明显能看到是因为XWorkList类找不到的异常，这还不简单，把这个类加入ClassPath中不就搞定吗，事实上没那么简单

 

异常出现的场景

 

在A项目中的EJB去调用B项目中EJB时，传递的参数是由A项目中Struts2的Action自动封装的实体属性，在实体中包含有一个List类型的属性，在List类型的属性中存储的是String类型的值，在A项目中直接将该属性作为参数传递给B项目中的EJB接口方法，在调用B项目EJB时，就抛出以上异常。（太绕了，都把人看晕了，没办法，表达能力差）

 

问题解析

经过不断google，不断的log，怎么都找不到哪儿会少XWorkList类，我的EJB端使用的是Spring和IBatis，不会用到什么XWorkList啊，可明明报的就是EJB异常啊，会是什么问题呢，无意中将Action自动封装的实体属性中的List属性类型打印出来看看，看这个List到底是个什么类型（只有这个List是从Web端传递过来的），哈哈，祸害终于找到，原来这个List是个XWorkList类型，郁闷得出去抽根烟

 

回来了将XWork包放入EJB的classpath，可启动时就报错，先不看什么错误，想一想也不对啊，EJB端和XWork有什么关系，删除掉，直接对实体中的XWorkList转换成ArrayList，经过测试，OK，异常无影了

 

就这问题搞了我两天，差点放弃，不过在即将崩溃的尽头，将问题解决也是一大快事，在这里贴出来希望能对大家有所帮助