“PWC6345: There is an error in invoking javac.” er

Question

I'm trying to deploy a JSP-page on Jetty, using the Jetty WTP plugin for Eclipse. But I get the error below. It looks like Jetty can't find javac. Is there any settings I have to do for the Jetty WTP plugin in Eclipse or how do I fix this?

The JSP page works fine if I export my project as a .war-file to jetty\webapps and then start Jetty manually using java -jar start.jar. But it doesn't work if I deploy using the Jetty WTP plugin for Eclipse as described.

I have my JAVA_HOME set to C:\Program Files (x86)\Java\jdk1.7.0_01 and I use Jetty 8.0.4 on Windows 7.

Servlets is working fine with the current setup. Any suggestions on how to solve this for JSP pages?

HTTP ERROR 500
Problem accessing /MyJavaWeb/formProcess. Reason: 

    PWC6345: There is an error in invoking javac.  A full JDK (not just JRE) is required

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.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:848)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:558)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:488)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:973)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:417)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:907)
    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 com.example.FormProcessServlet.doPost(FormProcessServlet.java:39)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:558)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:488)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:483)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:233)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:973)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:417)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:907)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
    at org.eclipse.jetty.server.Server.handle(Server.java:346)
    at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:442)
    at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:941)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:801)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:224)
    at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:51)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:586)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:44)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)
    at java.lang.Thread.run(Unknown Source)

Answer 1

I added this line to 'eclipse.ini' file which is present inside eclipse folder.

-vm C:\Program Files\Java\jdk1.8.0_131\bin\javaw.exe

and I also change the JRE path in eclipse

windows -> preferences -> java -> Installed JREs

and provided path upto jdk

C:\Program Files\Java\jdk1.8.0_131

Answer 2

I got the PWC6345 error when running jetty-runner 9.2.1 standalone from Windows 7 cmd (or batch file) with Oracle JDK 1.7.0_60, and none of the other suggestions in this or other forums worked. I'll leave my workaround here, in case it helps someone...

After installing the JDK, running 'where java' showed two different java.exe paths, the first being in the Windows system folder, and the second in the JDK folder (which is the one I added to the path manually). Both of these are actually installed by the same JDK installer. The java.exe in the system folder was taking precedence and causing the full JDK to go undetected.

Placing the JDK bin folder (e.g. "C:\Program Files\java\jdk1.7.0_60\bin") on the path before the other system paths fixed the issue.