IBM websphere 8.0中的嵌套異常BeanCreationException java.lang.LinkageError

Question

我試圖啓動我的應用程序部署在WAS 8控制檯中。我已經看到過類似的問題，但無法理解我必須實施的解決方案。請幫我解決一下這個。我堅持了很久。

服務器特定的類加載器策略：多 服務器特定的類加載模式：家長首先

EAR/WAR類裝入器策略：多 EAR/WAR類加載模式：父最後

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'soapFinsService' defined in class path resource [springcontext/api_third_party_beans.xml]: Invocation of init method failed; nested exception is java.lang.LinkageError: loading constraint violation when resolving method "javax/xml/ws/Service.create(Ljava/net/URL;Ljavax/xml/namespace/QName;)Ljavax/xml/ws/Service;" : loader "com/ibm/ws/classloader/CompoundClassLoader@197001c" of class "org/springframework/remoting/jaxws/LocalJaxWsServiceFactory" and loader "com/ibm/oti/vm/BootstrapClassLoader@753492c" of class "javax/xml/ws/Service" have different types for the method signature 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1455) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) 
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) 
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294) 
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225) 
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291) 
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) 
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:567) 
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913) 
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464) 
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:385) 
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:284) 
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111) 
at org.jboss.resteasy.plugins.spring.SpringContextLoaderListener.contextInitialized(SpringContextLoaderListener.java:48) 
at com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:1649) 
at com.ibm.ws.webcontainer.webapp.WebAppImpl.initialize(WebAppImpl.java:410) 
at com.ibm.ws.webcontainer.webapp.WebGroupImpl.addWebApplication(WebGroupImpl.java:88) 
at com.ibm.ws.webcontainer.VirtualHostImpl.addWebApplication(VirtualHostImpl.java:169) 
at com.ibm.ws.webcontainer.WSWebContainer.addWebApp(WSWebContainer.java:748) 
at com.ibm.ws.webcontainer.WSWebContainer.addWebApplication(WSWebContainer.java:633) 
at com.ibm.ws.webcontainer.component.WebContainerImpl.install(WebContainerImpl.java:422) 
at com.ibm.ws.webcontainer.component.WebContainerImpl.start(WebContainerImpl.java:714) 
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:1134) 

Answer 1

一LinkageError通常表示一個類可以看到某個類的兩個不同版本，一個直接（通過它自己的類加載器）和一個間接（通過其他加載器）。這通常只適用於「父親最後」風格的加載，所以如果你不需要，切換類加載模式可能會訣竅。一般來說，如果您沒有特定的原因使用「最後一個父母」，應該避免它，因爲它會使用默認的Java類加載行爲混淆，並可能導致類似這樣的問題。

根據錯誤消息，我猜想重複可見性類是javax.xml.namespace.QName類。您是否有理由在應用程序中打包XML API？ WAS的JDK中包含了Xerces的副本，因此除非您對XML提供者有一些特殊之處，否則實際上不太可能需要這樣做。如果您確實需要「最後一個父母」，那麼刪除包含XML API的jar也可能會解決問題。