Error while parsing JSP with WebLogic 5.1/SP9/JDK 1.2.2

Question

Hello everybody,
          I get the error given below when calling a JSP in a WebLogic
          application which seems to work fine in all other (non-JSP) parts:
          java.lang.NullPointerException:
               at weblogic.servlet.jsp.JspLexer.addSetPropertyValue(JspLexer.java:1432)
               at weblogic.servlet.jsp.JspLexer.mXML_SET_PROPERTY(JspLexer.java,
          Compiled Code)
               at weblogic.servlet.jsp.JspLexer.mXML_THING(JspLexer.java:1726)
               at weblogic.servlet.jsp.JspLexer.mTOKEN(JspLexer.java, Compiled Code)
               at weblogic.servlet.jsp.JspLexer.nextToken(JspLexer.java, Compiled
          Code)
               at weblogic.servlet.jsp.JspLexer.parse(JspLexer.java, Compiled Code)
               at weblogic.servlet.jsp.JspParser.doit(JspParser.java, Compiled Code)
               at weblogic.servlet.jsp.JspParser.parse(JspParser.java:159)
               at weblogic.servlet.jsp.Jsp2Java.outputs(Jsp2Java.java:109)
               at weblogic.utils.compiler.CodeGenerator.generate(CodeGenerator.java,
          Compiled Code)
               at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java, Compiled
          Code)
               at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:227)
               at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:200)
               at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:115)
               at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:915)
               at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:879)
               at weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:269)
               at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:365)
               at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:253)
               at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled
          Code)
          I know that this error has been reported more than once in these
          discussion groups, and all people who solved it say
          - that it occurs only wen running WebLogic 5.1 with JDK 1.3 instead of
          1.2.2
          - that it may also be caused by bad jsp code
          But in my case, it has to be another reason, because
          - I am using jdk 1.2.2
          - the same JSP file is running withour errors on WebLogic 6
          I wonder if it could have something to do with the operating system:
          the parsing error is produced on a Windows version of WL 5.1, while my
          WL 6 which doesn't cause errors is running with Linux.
          Many thanks in advance for any help,
          Eckhard Beisswenger
          

Answer 1

Once again me!
          After a long time, I stumbled by accident across the answer that solves the problem I described above. It is explained at
          http://support.bea.com/application;JSESSIONID_WLCS_DEFAULT=2R2lzQfEBxFRMX2z0AxeU1Un3N1522I9fCIUI7GfjnjsiSYkPscz
          The clue is that weblogic complains about corresponding get and set methods, when the type of the set methods parameter is different from the return type of the corresponding get method. Unfortunately, the weblogic lexer class gives only a NullPointerException without any hint.