Question

javax.servlet.jsp.JspTagException这个异常具体是什么异常，什么地方错了报这个异常谢谢 下面是代码 急急

javax.servlet.jsp.JspTagException: Illegal use of <when>-style tag without <choose> as its direct parent
at org.apache.taglibs.standard.tag.common.core.WhenTagSupport.doStartTag(WhenTagSupport.java:57)
at org.apache.jsp.en.cst_005flearner2.jsp.my_005ftrain_005fcourse_jsp._jspx_meth_c_005fwhen_005f29(my_005ftrain_005fcourse_jsp.java:4268)
at org.apache.jsp.en.cst_005flearner2.jsp.my_005ftrain_005fcourse_jsp._jspService(my_005ftrain_005fcourse_jsp.java:1624)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Unknown Source)
您说的对了 就是标签那块出错了 谢谢

Answer 1

应该是你在jsp页面中非法使用<when>标签 该标签必须是<choose>标签的直接子标签 不能单独是<when>标签 下面给出一个例子
<c:choose>
<c:when test="testCondition">
Content1
</c:when>
<c:when test="testCondition">
Content2
</c:when>
<c:otherwise>
Content3
</c:otherwise>
</c:choose>