DO NOT REPLY [Bug 32442] New: - provide more insight when failing with "Unable to compile class for JSP" and "Compile failed; see the compiler error output for details."

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http://issues.apache.org/bugzilla/show_bug.cgi?id=32442

           Summary: provide more insight when failing with "Unable to
                    compile class for JSP" and "Compile failed; see the
                    compiler error output for details."
           Product: Ant
           Version: 1.6.2
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core tasks
        AssignedTo: dev@ant.apache.org
        ReportedBy: hauser@acm.org


all of a sudden, my tomcat throws
<<org.apache.jasper.JasperException: Unable to compile class for JSP
	org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:97)
	org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:346)
	org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:414)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

Compile failed; see the compiler error output for details.
	org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:944)
	org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:764)
	org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:379)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
>> but there is no log where I could see what ant attempted to do nor what this
compiler output was.

Suggestions: 
1) in org.apache.tools.ant.taskdefs.compilers.Javac12.execute()
before doing
  return ok.booleanValue();
test if ok==false, then print the cmd.getArguments()
2) or in org.apache.tools.ant.taskdefs.Javac.compile()
   if (!adapter.execute()) {
     ...
   say a little bit more than just
     log(FAIL_MSG, Project.MSG_ERR);

The real reason was that a partition on my disk was full, so with this error
message, it was almost impossible to diagnose the problem (e.g. by attempting to
compile the jsp-file on the command-line and then perhaps get more hints on
missing tmp space of javac.exe???)

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