关于关于weblogic部署部署Java项目的包冲突问题的解决项目的包冲突问题的解决
主要介绍了关于weblogic部署Java项目的包冲突问题的解决,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编
来一起学习学习吧
我们可能会用各种应用服务部署我们的Java应用,比如Tomcat、WAS、weblogic等。Tomcat和WAS可能会比较少遇到一些奇怪的问题,但是用weblogic部署项目则经常遇到一些比如包冲突问题,路
径问题等奇怪但又常见的问题。
今天我就讲讲关于weblogic部署Java项目包冲突的问题。下面我举个例子:
当我在weblogic部署Java项目之后,启动没报任何错,没有异常。但是当我操作某个功能的时候页面就报错了:
后台报了这个错:
Root cause of ServletException.
java.lang.LinkageError: loader constraint violation: loader (instance of weblogic/utils/classloaders/ChangeAwareClassLoader)
previously initiated loading for a different type with name "javax/xml/namespace/QName"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at weblogic.utils.classloaders.GenericClassLoader.defineClass(GenericClassLoader.java:343)
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:302)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:270)
at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:64)
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAwareClassLoader.java:49)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at org.apache.xmlbeans.XmlBeans.buildMethod(XmlBeans.java:174)
at org.apache.xmlbeans.XmlBeans.buildNoArgMethod(XmlBeans.java:190)
at org.apache.xmlbeans.XmlBeans.buildGetContextTypeLoaderMethod(XmlBeans.java:200)
at org.apache.xmlbeans.XmlBeans.<clinit>(XmlBeans.java:126)
at org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorkbook$Factory.newInstance(Unknown Source)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.onWorkbookCreate(XSSFWorkbook.java:290)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:170)
at com.kayak.web.base.util.export.ExportExcelXSSF.export(ExportExcelXSSF.java:893)
at com.kayak.web.base.action.ExportExcelAction.exportExcel(ExportExcelAction.java:318)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60)
at com.kayak.web.user.filter.LoginCertifyFilter.doFilter(LoginCertifyFilter.java:125)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60)
at com.kayak.web.base.filter.LocalRequestFilter.doFilter(LocalRequestFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3748)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3714)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2283)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2182)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1499)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:263)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)
错误内容很长,但是要学会辨认,我刚开始就被一大堆错误误导了。关键的都是下面的这个:
loader (instance of weblogic/utils/classloaders/ChangeAwareClassLoader)
previously initiated loading for a different type with name "javax/xml/namespace/QName"
大概意思就是“加载器之前启动的时候加载了名字叫javax/xml/namespace/QName的其他类型的类”。其实转换一下就是,在启动的时候加载了一个javax/xml/namespace/QName类,我们现在要用的功
能需要一个类也叫javax/xml/namespace/QName,但是这个不是我们真正想要的class。
从上面的意思可以知道,这就是有两个相同包包路径和类名称的class,但是有一个想要的却没有,只有一个我们并不想要的class。了解weblogic部署的同学都知道,weblogic加载了一个相同的class就
不会在加载其他一样的class了。
当我再操作一次的之后又报另一个错(部分错误内容):
Root cause of ServletException.
java.lang.NoClassDefFoundError: Could not initialize class org.apache.xmlbeans.XmlBeans
at org.openxmlformats.schemas.spreadsheetml.x2006.main.CTWorkbook$Factory.newInstance(Unknown Source)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.onWorkbookCreate(XSSFWorkbook.java:290)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:170)
at com.kayak.web.base.util.export.ExportExcelXSSF.export(ExportExcelXSSF.java:893)