Application running fine on Tomcat 5.0 but failing in the weblogic 8.1

[naresh g goparapu]

java.lang.NullPointerException
at org.apache.struts.taglib.html.LinkTag.doStartTag()I(LinkTag.java:314)
at jsp_servlet._jsp.__crearescala._jspService(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse V(__crearescala.java:315)
at weblogic.servlet.jsp.JspBase.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse V(JspBase.java:33)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run()Ljava/lang/Object;(ServletStubImpl.java:1072)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lweblogic/servlet/internal/FilterChainImpl V(ServletStubImpl.java:465)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse V(ServletStubImpl.java:348)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run()Ljava/lang/Object;(WebAppServletContext.java:6981)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic/security/subject/AbstractSubject;Ljava/security/PrivilegedAction Ljava/lang/Object;(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(Lweblogic/security/acl/internal/AuthenticatedSubject;Lweblogic/security/acl/internal/AuthenticatedSubject;Ljava/security/PrivilegedAction Ljava/lang/Object;(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(Lweblogic/servlet/internal/ServletRequestImpl;Lweblogic/servlet/internal/ServletResponseImpl V(WebAppServletContext.java:3892)
at weblogic.servlet.internal.ServletRequestImpl.execute(Lweblogic/kernel/ExecuteThread V(ServletRequestImpl.java:2766)
at weblogic.kernel.ExecuteThread.execute(Lweblogic/kernel/ExecuteRequest V(ExecuteThread.java:224)
at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:183)
at java.lang.Thread.startThreadFromVM(Ljava/lang/Thread V(Unknown Source



Thanks in adavance