What's  *.ser file used for?

Hi,All,
          I got a servlet application need to test which use weblogic5.1 on NT4,
          Question 1:
          I run application use URL like,
          http://201.70.4.157:8001/booking/ServletStub?file=Chair_jsp_booking_Index_js
          p.ser
          Also, I found a data directory which contain jspbooking_Index.ser and
          others ser files
          which is used for Servlet, What's these ser file do? How did these ser
          files be generated?
          Question 2:
          When I tried to modify index.jsp file called by servlet,for instance,
          just put a space in html code(no syntax error),it give me following error, I
          undo change,
          but still got the same error untill I restore origanial version of jsp file.
          any idea?
          It looks like a custom tag error, but I didnt change it.
          Mon Nov 13 11:48:52 GMT+11:00 2000:<I> <WebAppServletContext-fflyer>
          resolving taglib uri 'http://www.bookpool.com/comm/taglib' to
          taglib-location /WEB-INF/tld/comm.tld:
          Mon Nov 13 11:48:52 GMT+11:00 2000:<E> <WebAppServletContext-fflyer> Servlet
          failed with Exception
          java.lang.NoSuchMethodError: javax.servlet.jsp.tagext.TagAttributeInfo:
          method <init>(Ljava/lang/String;ZZLjava/lang/String;)V not found
          at weblogic.servlet.jsp.MyAttInfo.<init>(StandardTagLib.java:34)
          at
          weblogic.servlet.jsp.StandardTagLib.processTag(StandardTagLib.java:303)
          at
          weblogic.servlet.jsp.StandardTagLib.processTagElements(StandardTagLib.java:1
          46)
          at
          weblogic.servlet.jsp.StandardTagLib.<init>(StandardTagLib.java:125)
          at weblogic.servlet.jsp.JspLexer.loadTagLib(JspLexer.java:87)
          at
          weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE_BODY(JspLexer.java:3611)
          at
          weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE(JspLexer.java:3367)
          at weblogic.servlet.jsp.JspLexer.mDIRECTIVE(JspLexer.java:3228)
          at weblogic.servlet.jsp.JspLexer.mSTANDARD_THING(JspLexer.java:1669)
          at weblogic.servlet.jsp.JspLexer.mTOKEN(JspLexer.java:1510)
          at weblogic.servlet.jsp.JspLexer.nextToken(JspLexer.java:1400)
          at weblogic.servlet.jsp.JspLexer.parse(JspLexer.java:816)
          at weblogic.servlet.jsp.JspParser.doit(JspParser.java:69)
          at weblogic.servlet.jsp.JspParser.parse(JspParser.java:115)
          at weblogic.servlet.jsp.Jsp2Java.outputs(Jsp2Java.java:97)
          at
          weblogic.utils.compiler.CodeGenerator.generate(CodeGenerator.java:242)
          at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java:248)
          at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:173)
          at weblogic.servlet.jsp.JspStub.checkForReload(JspStub.java:92)
          at
          weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:19
          0)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
          :117)
          at
          weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImp
          l.java:153)
          at
          au.com.qantas.ecomm.util.servlet.stub.ServletStub.restore(ServletStub.java:1
          25)
          at
          au.com.qantas.ecomm.util.servlet.stub.ServletStub.doPost(ServletStub.java:99
          at
          au.com.qantas.ecomm.util.servlet.stub.ServletStub.doGet(ServletStub.java:104
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
          :123)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java:744)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java:692)
          at
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContext
          Manager.java:251)
          at
          weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:363)
          at
          weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:263)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          Thanks
          

          "David" <[email protected]> wrote:
          >Question 2:
          >When I tried to modify index.jsp file called by servlet,for instance,
          >just put a space in html code(no syntax error),it give me following error, I
          >undo change,
          >but still got the same error untill I restore origanial version of jsp file.
          >any idea?
          >It looks like a custom tag error, but I didnt change it.
          >
          >Mon Nov 13 11:48:52 GMT+11:00 2000:<I> <WebAppServletContext-fflyer>
          >resolving taglib uri 'http://www.bookpool.com/comm/taglib' to
          >taglib-location /WEB-INF/tld/comm.tld:
          >Mon Nov 13 11:48:52 GMT+11:00 2000:<E> <WebAppServletContext-fflyer> Servlet
          >failed with Exception
          >java.lang.NoSuchMethodError: javax.servlet.jsp.tagext.TagAttributeInfo:
          >method <init>(Ljava/lang/String;ZZLjava/lang/String;)V not found
          > at weblogic.servlet.jsp.MyAttInfo.<init>(StandardTagLib.java:34)
          > at
          >weblogic.servlet.jsp.StandardTagLib.processTag(StandardTagLib.java:303)
          >[...blah blah JspLexer blah blah blah]
          The same problem is affecting me in a more serious way.
          I think the problem you are having is that somehow you have a Servlet-2.2.0.jar in your classpath at the time the JSP is being parsed.
          What is disturbing is that BEA claims WebLogic 5.1 supports JSP 1.1 Spec, but WebLogic "JspLexer" code tries to construct a javax.servlet.jsp.tagext.TagAttributeInfo using (String, String). The JSP 1.1 Spec says the only constructor is (String, boolean, String, boolean).
          My question is: What version of the JSP Spec does WebLogic 5.1 actually support?
          Brian
          

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