開發人員對Java程式版本更新之後，重啟Weblogic，發現java.lang.UnsupportedClassVersionError Unsupported major.minor version 51.0錯誤，主要錯誤資訊如下：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'pageCond': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: protected com.bocom.jump.bp.service.sqlmap.SqlMap com.bocom.training.jump.common.dao.BaseDao.sqlMap; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.bocom.feps.webservices.accounting.service.impl.QueryUniqueCodeServiceImpl] for bean with name 'queryUniqueCodeService' defined in class path resource [config/webservice-beans.xml]; nested exception is java.lang.ClassNotFoundException: Class bytes found but defineClass()failed for: 'com.bocom.feps.webservices.accounting.service.impl.QueryUniqueCodeServiceImpl'
……
Caused By: org.springframework.beans.factory.BeanCreationException: Could not autowire field: protected com.bocom.jump.bp.service.sqlmap.SqlMap com.bocom.training.jump.common.dao.BaseDao.sqlMap; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.bocom.feps.webservices.accounting.service.impl.QueryUniqueCodeServiceImpl] for bean with name 'queryUniqueCodeService' defined in class path resource [config/webservice-beans.xml]; nested exception is java.lang.ClassNotFoundException: Class bytes found but defineClass()failed for: 'com.bocom.feps.webservices.accounting.service.impl.QueryUniqueCodeServiceImpl'
……
Caused By: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.bocom.feps.webservices.accounting.service.impl.QueryUniqueCodeServiceImpl] for bean with name 'queryUniqueCodeService' defined in class path resource [config/webservice-beans.xml]; nested exception is java.lang.ClassNotFoundException: Class bytes found but defineClass()failed for: 'com.bocom.feps.webservices.accounting.service.impl.QueryUniqueCodeServiceImpl'
……
Caused By: java.lang.ClassNotFoundException: Class bytes found but defineClass()failed for: 'com.bocom.feps.webservices.accounting.service.impl.QueryUniqueCodeServiceImpl'
……
Caused By: java.lang.UnsupportedClassVersionError: com/bocom/feps/webservices/accounting/service/impl/QueryUniqueCodeServiceImpl : Unsupported major.minor version 51.0
……

經過查詢MOS發現，該問題屬於JDK衝突問題， 應用程式是使用JDK構建的，Weblogic環境中安裝的JDK不支援該應用程式。 為避免異常，需要使用正確的JDK版本構建應用程式。

經與開發人員溝通，開發人員使用Weblogic環境中對應版本的JDK重新構建應用，然後更新之後問題順利處理。

附MOS原文

UnsupportedClassVersionError: Unable to set the activation state to true for the application (文件 ID 2132881.1)

轉到底部

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In this Document GoalSolution APPLIES TO: Oracle WebLogic Server - Version 11.1.1.5.0 and later Information in this document applies to any platform. GOAL UnsupportedClassVersionError exception when deploying new application on Weblogic server. ####<Feb 11, 2016 10:15:04 AM EST> <Error> <HTTP> <******> <AdminServer> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1455203704171> <BEA-101165> <Could not load user defined filter in web.xml: ServletContext@6640065[app:*****_war module:******.war path:/****** spec-version:2.5] info.***.webapp.filters.PathFilter. java.lang.ClassNotFoundException: Class bytes found but defineClass()failed for: 'info.***.webapp.filters.PathFilter' ...... java.lang.UnsupportedClassVersionError: info/***/webapp/filters/PathFilter : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) at weblogic.utils.classloaders.GenericClassLoader.defineClass(GenericClassLoader.java:344) at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:301) at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:269) at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:55) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:177) at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:36)   SOLUTION This is a JDK conflict issue.   The application is built with JDK that is not supported by the JDK installed in the Weblogic environment. To avoid the exception, please build your application with correct JDK version.