loader constraint violation错误

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错误信息

HTTP Status 500 - java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(Ljavax/servlet/ServletConfig;)Lorg/apache/tomcat/InstanceManager;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of java/net/URLClassLoader) for the method's defining class, org/apache/jasper/runtime/InstanceManagerFactory, have different Class objects for the type org/apache/tomcat/InstanceManager used in the signaturetype Exception reportmessage java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(Ljavax/servlet/ServletConfig;)Lorg/apache/tomcat/InstanceManager;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of java/net/URLClassLoader) for the method's defining class, org/apache/jasper/runtime/InstanceManagerFactory, have different Class objects for the type org/apache/tomcat/InstanceManager used in the signaturedescription The server encountered an internal error that prevented it from fulfilling this request.exceptionjavax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(Ljavax/servlet/ServletConfig;)Lorg/apache/tomcat/InstanceManager;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of java/net/URLClassLoader) for the method's defining class, org/apache/jasper/runtime/InstanceManagerFactory, have different Class objects for the type org/apache/tomcat/InstanceManager used in the signature    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:349)    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)root causejava.lang.LinkageError: loader constraint violation: when resolving method "org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(Ljavax/servlet/ServletConfig;)Lorg/apache/tomcat/InstanceManager;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of java/net/URLClassLoader) for the method's defining class, org/apache/jasper/runtime/InstanceManagerFactory, have different Class objects for the type org/apache/tomcat/InstanceManager used in the signature    org.apache.jsp.index_jsp._jspInit(index_jsp.java:53)    org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:179)    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)note The full stack trace of the root cause is available in the Apache Tomcat/8.0.23 logs.Apache Tomcat/8.0.23

参考：

• http://somebody-hjh.iteye.com/blog/778883
• http://blog.163.com/huang_ying_lu/blog/static/2699983201182122719963/

我尝试把一个jar替换没改善，由于不能确定是哪个jar冲突，于是，把tomcat8换为tomcat7。然后,报另一个错误：JspSourceImports找不到

另一个报错信息

HTTP Status 500 - java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspSourceImportstype Exception reportmessage java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspSourceImportsdescription The server encountered an internal error that prevented it from fulfilling this request.exceptionjavax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspSourceImports    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:348)    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)root causejava.lang.NoClassDefFoundError: org/apache/jasper/runtime/JspSourceImports    java.lang.ClassLoader.defineClass1(Native Method)    java.lang.ClassLoader.defineClass(ClassLoader.java:760)    java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)    java.net.URLClassLoader.defineClass(URLClassLoader.java:467)    java.net.URLClassLoader.access$100(URLClassLoader.java:73)    java.net.URLClassLoader$1.run(URLClassLoader.java:368)    java.net.URLClassLoader$1.run(URLClassLoader.java:362)    java.security.AccessController.doPrivileged(Native Method)    java.net.URLClassLoader.findClass(URLClassLoader.java:361)    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:132)    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:172)    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:376)    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)root causejava.lang.ClassNotFoundException: org.apache.jasper.runtime.JspSourceImports    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:126)    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)    java.lang.ClassLoader.defineClass1(Native Method)    java.lang.ClassLoader.defineClass(ClassLoader.java:760)    java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)    java.net.URLClassLoader.defineClass(URLClassLoader.java:467)    java.net.URLClassLoader.access$100(URLClassLoader.java:73)    java.net.URLClassLoader$1.run(URLClassLoader.java:368)    java.net.URLClassLoader$1.run(URLClassLoader.java:362)    java.security.AccessController.doPrivileged(Native Method)    java.net.URLClassLoader.findClass(URLClassLoader.java:361)    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:132)    org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:63)    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:172)    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:376)    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)note The full stack trace of the root cause is available in the Apache Tomcat/7.0.62 logs.

后来不知道怎么重启了几次，重cp了部署包，就ok了，我怀疑估计是缓存什么的问题。
最后尝试了一把，果然是缓存问题，把tomcat中的work/Catalina/localhost删掉即可！

总结：
1. 把tomcat8换为tomcat7（当然，如果你明确知道哪个jar冲突，直接处理也行）
2. 清掉work

2015.6.18