jetty org.apache.jasper.JasperException：无法为 JSP 编译类答案

【问题标题】：jetty org.apache.jasper.JasperException: Unable to compile class for JSPjetty org.apache.jasper.JasperException：无法为 JSP 编译类
【发布时间】：2018-12-03 12:51:37
【问题描述】：

org.apache.jasper.JasperException: 无法为 JSP 编译类

我使用嵌入式码头

org.apache.jasper.JasperException: Unable to compile class for JSP
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:610)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:368)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    at org.eclipse.jetty.jsp.JettyJspServlet.service(JettyJspServlet.java:112)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:856)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:535)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at org.eclipse.jetty.server.Server.handle(Server.java:531)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
    at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:754)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:672)
    at java.lang.Thread.run(Thread.java:748)
    Caused by: 
java.lang.NullPointerException
    at org.apache.jasper.compiler.Validator$ValidateVisitor.<init>(Validator.java:516)
    at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1854)
    at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:221)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:374)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:351)
    at org.apache.jasper.compiler.Compiler.compile(Compiler.java:335)
    at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:595)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:368)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
    at org.eclipse.jetty.jsp.JettyJspServlet.service(JettyJspServlet.java:112)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:856)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:535)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at org.eclipse.jetty.server.Server.handle(Server.java:531)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)
    at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:754)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:672)
    at java.lang.Thread.run(Thread.java:748)

【问题讨论】：

在堆栈跟踪中必须有一些关于异常原因的更多信息。请看看你是否也能找到并添加它。
应该有更多的日志表明是什么文件导致了问题，以及一个行号表明该文件在哪里编译失败。

标签： jsp jetty embedded-jetty

【解决方案1】：

@Joakim Erdfelt 没有别的了，我只是访问一个JSP。这是我的代码：

 Server server = new Server();
          ServerConnector connector = new ServerConnector(server);
    connector.setPort(8080);
    server.addConnector(connector);
    WebAppContext context1 = new WebAppContext();  
    context1.setDescriptor("./webContent/WEB-INF/web.xml");     
    context1.setResourceBase("./webContent");  
    context1.setContextPath("/java_web_test");  
    context1.setParentLoaderPriority(true);  
    server.setHandler(context1);  
    try {
        server.start();
    } catch (Exception e) {
    ......

【讨论】：

【解决方案2】：

要解决这个问题，首先检查你的代码如果您在特定行有任何错误，那么它是因为那个特定的行错误。

否则您需要将一个 jar 文件添加到您的项目库中然后重新启动您的本地主机服务器

【讨论】：