admin.jsp throws Exception in SunOne Application Server 7

A click on the Administration link leeds to an empty page and the following logfile entries:

[27/Apr/2006:16:59:59] SEVERE (10310): ApplicationDispatcher[/JIRA] Servlet.service() for servlet jsp threw exception
javax.servlet.ServletException: (class: _jasper/_decorators/_admin_jsp, method: _jspService signature: (Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V) Illegal target of jump or branch
at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:296)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:757)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:626)
at org.apache.catalina.core.ApplicationDispatcher.access$100(ApplicationDispatcher.java:123)
at org.apache.catalina.core.ApplicationDispatcher$PrivilegedInclude.run(ApplicationDispatcher.java:154)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:528)
at com.opensymphony.module.sitemesh.filter.PageFilter.writeDecorator(PageFilter.java:173)
at com.opensymphony.module.sitemesh.filter.PageFilter.applyDecorator(PageFilter.java:158)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:62)
at com.atlassian.jira.web.filters.SitemeshExcludePathFilter.doFilter(SitemeshExcludePathFilter.java:38)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:182)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:177)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:132)
at com.atlassian.jira.web.filters.ProfilingAndErrorFilter.doFilter(ProfilingAndErrorFilter.java:25)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
at com.atlassian.jira.web.filte