Error reading portlet.tld file

Hi All,
I am using weblogic and pluto 1.1.4 (also tried 1.1.3). When I try to access
any portlets (Test Portlet #1, Test Portlet 2(en) etc) I am getting the
following JSP exception stating that it cannot read the deployment
descriptor. I tried rectifying it by adding JAXP and Xerces and other XML
libraries to classpath, but with no luck. 
Also, I am getting the notorious "java.lang.IllegalStateException: portlet
container does not support buffering" error. 

Can any body tell me how these two issues can be rectified? 

Thanks in advance.

Sankar

weblogic.servlet.jsp.JspException: (line 25): Could not parse deployment
descriptor: java.io.IOException: cannot resolve
'http://java.sun.com/portlet' into a valid tag library
	at weblogic.servlet.jsp.JspLexer.jspException(JspLexer.java:712)
	at weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE_BODY(JspLexer.java:5095)
	at weblogic.servlet.jsp.JspLexer.mTAGLIB_DIRECTIVE(JspLexer.java:4919)
	at weblogic.servlet.jsp.JspLexer.mDIRECTIVE(JspLexer.java:4765)
	at weblogic.servlet.jsp.JspLexer.mSTANDARD_THING(JspLexer.java:2143)
	at weblogic.servlet.jsp.JspLexer.mTOKEN(JspLexer.java:1929)
	at weblogic.servlet.jsp.JspLexer.nextToken(JspLexer.java:1802)
	at weblogic.servlet.jsp.JspLexer.parse(JspLexer.java:963)
	at weblogic.servlet.jsp.JspParser.doit(JspParser.java:106)
	at weblogic.servlet.jsp.JspParser.parse(JspParser.java:232)
	at weblogic.servlet.jsp.Jsp2Java.outputs(Jsp2Java.java:125)
	at weblogic.utils.compiler.CodeGenerator.generate(CodeGenerator.java:258)
	at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java:388)
	at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:238)
	at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:188)
	at
weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:535)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:373)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:463)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
	at
weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:622)
	at
weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:412)
	at
org.apache.pluto.internal.impl.PortletRequestDispatcherImpl.include(PortletRequestDispatcherImpl.java:106)
	at org.apache.pluto.testsuite.TestPortlet.doView(TestPortlet.java:214)
	at javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:235)
	at javax.portlet.GenericPortlet.render(GenericPortlet.java:163)
	at org.apache.pluto.core.PortletServlet.dispatch(PortletServlet.java:208)
	at org.apache.pluto.core.PortletServlet.doGet(PortletServlet.java:139)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
	at
weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:622)
	at
weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:412)
	at
org.apache.pluto.core.DefaultPortletInvokerService.invoke(DefaultPortletInvokerService.java:167)
	at
org.apache.pluto.core.DefaultPortletInvokerService.render(DefaultPortletInvokerService.java:101)
	at
org.apache.pluto.core.PortletContainerImpl.doRender(PortletContainerImpl.java:173)
	at org.apache.pluto.driver.tags.PortletTag.doStartTag(PortletTag.java:152)
	at
jsp_servlet._web_45_inf._themes.__portlet_45_skin._jspService(__portlet_45_skin.java:145)
	at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
	at
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
	at
weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:626)
	at
weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:412)
	at weblogic.servlet.jsp.PageContextImpl.include(PageContextImpl.java:154)
	at
jsp_servlet._web_45_inf._themes.__pluto_45_default_45_theme._jspService(__pluto_45_default_45_theme.java:496)
	at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
	at
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:463)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
	at
weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:318)
	at
org.apache.pluto.driver.PortalDriverServlet.doGet(PortalDriverServlet.java:142)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
	at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
	at
weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6456)
	at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
	at
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
	at
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3661)
	at
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2630)
	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)


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