关于weblogic部署Java项目的包冲突问题的解决-eolink官网

关于weblogic部署Java项目的包冲突问题的解决

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.(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.(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)