我在我的web-app的web.xml中添加了一个Servlet过滤器。它应该只是拦截一些调用并重定向它们。启动Jetty服务器时，我可以看到我的过滤器正在被初始化，因为正在调用函数public void init(final FilterConfig config)。
但是，当从浏览器发送请求时，我得到以下异常
PWC6345: There is an error in invoking javac. A full JDK (not just JRE) is required
我正在使用配置了Jdk 7和Jetty 8.12的eclipse。有什么迹象表明我可以做些什么来摆脱这个？下面是stacktrace
Caused by:
org.apache.jasper.JasperException: PWC6345: There is an error in invoking javac. A full JDK (not just JRE) is required
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:92)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:378)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:119)
at org.apache.jasper.compiler.Jsr199JavaCompiler.compile(Jsr199JavaCompiler.java:208)
at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:384)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:453)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:625)
at org.apache.jasper.servlet.JspServletWrapper.loadTagFile(JspServletWrapper.java:280)
at org.apache.jasper.compiler.TagFileProcessor.loadTagFile(TagFileProcessor.java:660)
at org.apache.jasper.compiler.TagFileProcessor.access$000(TagFileProcessor.java:91)
at org.apache.jasper.compiler.TagFileProcessor$TagFileLoaderVisitor.visit(TagFileProcessor.java:719)
at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1502)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2297)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2347)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2353)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:499)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2297)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2347)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2371)
at org.apache.jasper.compiler.Node$IncludeDirective.accept(Node.java:648)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2297)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2347)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2353)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:499)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2297)
at org.apache.jasper.compiler.TagFileProcessor.loadTagFiles(TagFileProcessor.java:737)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:235)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:625)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:492)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:378)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:594)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:486)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:542)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:271)
at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:98)
at org.eclipse.jetty.servlet.DefaultServlet.doGet(DefaultServlet.java:557)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:594)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:486)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111)
at org.eclipse.jetty.server.Server.handle(Server.java:351)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:634)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:609)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:45)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:599)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:534)
at java.lang.Thread.run(Unknown Source)