瀏覽器運行項目異常如下:

HTTP Status 500 -type Exception reportmessagedescription The server encountered an internal error () that prevented it from fulfilling this request.exceptionjava.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 p.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory; used in the signatureorg.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:181)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)javax.servlet.http.HttpServlet.service(HttpServlet.java:722)org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96)note The full stack trace of the root cause is available in the Apache Tomcat/7.0.22 logs.

剛看到該異常有點蒙,Ljavax/el/ExpressionFactory什么鬼,我的servlet-api.jar和jsp-api.jar都有啊

<dependency><groupId>org.apache.tomcat</groupId><artifactId>servlet-api</artifactId><version>6.0.37</version> </dependency> <dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.1</version> </dependency>　　

通過網上的解釋是tomcat1.7中的servlet-api.jar包,jsp-api.jar等與自己lib中的jar有所沖突

給的解決方案就是去掉自己項目中lib中沖突的jar包

但是問題又來了,那自己的是maven項目重啟不就找不到相關jar包了嗎,啟動不就報錯了嗎

好吧,那我就設置包的作用范圍為provided

<dependency><groupId>org.apache.tomcat</groupId><artifactId>servlet-api</artifactId><version>6.0.37</version><scope>provided</scope> </dependency> <dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.1</version><scope>provided</scope> </dependency>

重新發布,啟動tomcat,運行,成功,謝謝老天

PS_Maven_scope:

在POM 4中,<dependency>中<scope>,它主要管理依賴的部署,目前<scope>可以使用5個值* compile: 缺省值,適用于所有階段,會隨著項目一起發布* provided: 類似compile,期望JDK、容器或使用者會提供這個依賴,如servlet.jar* runtime: 只在運行時使用,如JDBC驅動,適用運行和測試階段* test: 只在測試時使用,用于編譯和運行測試代碼,不會隨項目發布* system: 類似provided,需要顯式提供包含依賴的jar,Maven不會在Repository中查找它

轉載于:https://www.cnblogs.com/eRrsr/p/6202181.html

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