java.lang.LinkageError:javax.servlet.jsp.JspApplicationContext.getExpressionFactory [英] java.lang.LinkageError: javax.servlet.jsp.JspApplicationContext.getExpressionFactory
问题描述
当我尝试在Tomcat 7上运行Web应用程序时，出现以下异常:
When I try to run my webapp on Tomcat 7, I got the following exception:
exception
javax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;
" 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 org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext,
have different Class objects for the type javax/el/ExpressionFactory used in the signature
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:343)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" 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 org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature
org.apache.jsp.index_jsp._jspInit(index_jsp.java:31)
org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:180)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
似乎两个.jar库之间存在冲突，但是我不知道它们是哪个.我该如何解决它们?
It seems that there's a conflict between two .jar librairies, but I don't know which they are. How can I figure them out and solve it?
推荐答案
当您在Web应用程序的/WEB-INF/lib中包含不同服务器品牌/版本的特定于服务器的库时，就会发生这种情况，例如， el-api.jar，servlet-api.jar等.您需要全部删除. /WEB-INF/lib不应包含任何服务器特定的库.它们属于特定的服务器本身(Tomcat已将它们保存在/lib文件夹中).
That will happen when you include server-specific libraries of a different server make/version in the /WEB-INF/lib of your web application, such as jsp-api.jar, el-api.jar, servlet-api.jar, etc. You need to remove them all. The /WEB-INF/lib should not contain any server-specific libraries. They belongs in the specific server itself (Tomcat has them in its /lib folder already).
这是当他们在IDE项目中的JSP/Servlet API上遇到编译错误时，这是一个非常常见的初学者的错误.这应该已经以不同的方式解决，即通过将服务器集成在IDE中并将服务器添加为目标运行时"来解决.进入项目.
This is by the way a pretty common beginner's mistake whenever they encounter compilation errors on the JSP/Servlet API in their IDE project. This should have been solved differently, namely by integrating the server in the IDE and adding the server as "Target runtime" to the project.
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