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java.lang.NullPointerException: 	at weblogic.utils.UnsyncHashtable.put(UnsyncHashtable.java:277)	at weblogic.servlet.jsp.PageContextImpl.setAttribute(PageContextImpl.java:163)	at net.sf.navigator.taglib.UseMenuDisplayerTag.doStartTag(UseMenuDisplayerTag.java:223)	at net.sf.navigator.taglib.el.UseMenuDisplayerTag.doStartTag(UseMenuDisplayerTag.java:88)	at jsp_servlet._web_45_inf._pages.__menu._jspService(__menu.java:226)	at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:39)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:375)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:72)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:72)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:72)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:292)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:106)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:79)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:143)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:246)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:156)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:173)	at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:120)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:628)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:412)	at weblogic.servlet.jsp.PageContextImpl.include(PageContextImpl.java:154)	at jsp_servlet._decorators.__default._jspService(__default.java:800)	at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)	at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:39)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:375)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:72)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:72)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:72)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:292)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:106)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:79)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:143)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:246)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:156)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:173)	at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:120)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:628)	at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispatcherImpl.java:412)	at com.opensymphony.module.sitemesh.filter.PageFilter.applyDecorator(PageFilter.java:156)	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:59)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:375)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.firium.webapp.filter.GZIPFilter.doFilterInternal(GZIPFilter.java:42)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.firium.webapp.filter.LocaleFilter.doFilterInternal(LocaleFilter.java:55)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at com.opensymphony.clickstream.ClickstreamFilter.doFilter(ClickstreamFilter.java:42)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:292)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:79)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:143)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:246)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:220)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:303)	at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:173)	at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:120)	at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6458)	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)