JSP TAGEXTRA INFO

[Lakshmi Anantharaman]

1) Why do I sometime get this error while trying to use scripting variable with my tag class!
2) Can scripting variable be repeated ?

java.lang.NullPointerException
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:279)
at java.lang.ClassLoader.loadClass(ClassLoader.java:290)
at java.lang.ClassLoader.loadClass(ClassLoader.java:290)
at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
at weblogic.utils.classloaders.ChangeAwareClassLoader.loadClass(ChangeAw
areClassLoader.java:43)
at weblogic.servlet.jsp.StandardTagLib.addUserVariableToScope(StandardTa
gLib.java:863)
at weblogic.servlet.jsp.StandardTagLib.declarePageVars(StandardTagLib.ja
va:506)
at weblogic.servlet.jsp.StandardTagLib.processTag(StandardTagLib.java:66
6)
at weblogic.servlet.jsp.JspLexer.mOPEN_EXTENSION_TAG(JspLexer.java:2194)
at weblogic.servlet.jsp.JspLexer.mTOKEN(JspLexer.java:1856)
at weblogic.servlet.jsp.JspLexer.nextToken(JspLexer.java:1735)
at weblogic.servlet.jsp.JspLexer.parse(JspLexer.java:1015)
at weblogic.servlet.jsp.JspParser.doit(JspParser.java:78)
at weblogic.servlet.jsp.JspParser.parse(JspParser.java:181)
at weblogic.servlet.jsp.Jsp2Java.outputs(Jsp2Java.java:119)
at weblogic.utils.compiler.CodeGenerator.generate(CodeGenerator.java:255
)
at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java:327)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:189)
at weblogic.servlet.jsp.JspStub.checkForReload(JspStub.java:139)
at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.
java:372)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm