Classloader problem in JBoss 3.2.3 with Jetty

[tsangcn]

my application works well in JBoss 3.2.1 (with Jetty).

But when I upgrade to JBoss 3.2.3 (with jboss-3.2.2-jetty-4.2.14.sar), I
always get (in my JSP) the following exception

javax.servlet.ServletException
at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:531)
......
getRootCause():
java.lang.ClassCastException
at org.apache.jasper.runtime.TagHandlerPool.get(TagHandlerPool.java:109)
......

After I restart JBoss (without delete the generated stuff from the
previous step), I got the following exception

java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/BodyContent
......



Then I delete all the generated stuffs, and replace
jboss-3.2.2-jetty-4.2.14.sar with jboss-3.2-jetty-4.2.17.sar, I got the
following exception

JspFactoryImpl: Exception initializing page context
java.lang.LinkageError: loader constraints violated when linking
javax/servlet/jsp/JspWriter class
at
org.apache.jasper.runtime.JspFactoryImpl.internalGetPageContext(JspFactoryImpl.java:170)
at
org.apache.jasper.runtime.JspFactoryImpl.getPageContext(JspFactoryImpl.java:154)
......


After I restart JBoss (without deleteing the generated stuffs), I got
the following exception

javax.servlet.ServletException: loader constraints violated when linking
javax/servlet/jsp/tagext/Tag class
at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:536)

But sometimes, I got the following exception in first start of JBoss

javax.servlet.ServletException
at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:531)
......
getRootCause():
java.lang.ClassCastException
at org.apache.jasper.runtime.TagHandlerPool.get(TagHandlerPool.java:109)
at
......


So, I need help. It seems that it always failed in customized tag with
the following exceptions

- java.lang.ClassCastException in TagHandlerPool

- java.lang.LinkageError: loader constraints violated when linking
javax/servlet/jsp/tagext/Tag class

- java.lang.LinkageError: loader constraints violated when linking
javax/servlet/jsp/JspWriter class

- java.lang.NoClassDefFoundError: javax/servlet/jsp/tagext/BodyContent

Since the messages are so strange so I think that the problem is related to classloader.
Can anyone help to solve the problem?

[tsangcn]

Good news. After I deleted the file javax.servlet.jar in server/default/lib, the problem is solved. Now everything runs successfully.

Thanks
C. N.

[mysorevish]

I am getting this error how to slove this

java.lang.LinkageError: loader constraints violated when linking javax/servlet/jsp/tagext/BodyContent class
at org.apache.jasper.runtime.JspFactoryImpl.internalGetPageContext(JspFactoryImpl.java:170)
at org.apache.jasper.runtime.JspFactoryImpl.getPageContext(JspFactoryImpl.java:154)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:64)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)