System Error when more than one user in a group

When clicking on a group name link on the Manage Groups page for a group that have more than one member we get a System Error. If the group only has one member it then the responding page lists the member of that group correctly. The following is the error:
CONFLUENCE
System Error
A system error has occurred - our apologies!
Please contact your Confluence administrator to create a support issue on our support system at http://support.atlassian.com with the following information:
1. a description of your problem and what you were doing at the time it occurred
2. cut & paste the error and system information found below
3. attach the application server log file (if possible).
We will respond as promptly as possible.
Thank you!
Cause:
No exception
Stack Trace: [hide]
null
Referer URL: https://owe-server.domain.com/confluence/admin/users/browsegroups.action
Build Information:
confluence.home: /opt/local/confluence-2.7.2
system.uptime: 17 days, 22 hours, 34 minutes
system.version: 2.7.2
build.number: 1115
Unique ID: 0x0000011A028467DF86097AA30022C5AED89F23592B0CBC2BCA2ABF12723C9654
Server Information:
Application Server: Oracle Containers for J2EE 10g (10.1.3.3.0)
Servlet Version: 2.4
Database Dialect: net.sf.hibernate.dialect.Oracle9Dialect
Database Driver Name: N/A
Database Driver Version: N/A
Database Name: N/A
Database Version: N/A
Memory Information:
total.memory: 993 MB
free.memory: 186 MB
used.memory: 807 MB
System Information:
system.date: Monday, 19 May 2008
system.time: 11:50:11
system.favourite.colour: Cinnabar
java.version: 1.6.0_03
java.vendor: Sun Microsystems Inc.
jvm.version: 1.0
jvm.vendor: Sun Microsystems Inc.
jvm.implementation.version: 1.6.0_03-b05
java.runtime: Java(TM) SE Runtime Environment
java.vm: Java HotSpot(TM) Server VM
user.name.word: oracle
user.timezone: America/Los_Angeles
operating.system: Linux 2.4.21-37.0.1.ELsmp
os.architecture: i386
fs.encoding: UTF-8
Cluster Information:
Not clustered.
Enabled Plugins:
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JIRA Macros (confluence.extra.jira, Version: 2.4.1)
Social Bookmarking Plugin (com.atlassian.confluence.plugins.socialbookmarking, Version: 1.0.7)
Admin Sections (confluence.sections.admin, Version: 1.0)
Chart Plugin (confluence.extra.chart, Version: 1.9)
Left Navigation Theme (com.atlassian.confluence.themes.leftnavigation, Version: 1.5.1)
Confluence Remote API (confluence.extra.confluencerpc, Version: 2.7.2)
Page Operations (confluence.sections.page.operations, Version: 1.0)
Advanced Macros (confluence.macros.advanced, Version: 1.3)
Code Macro (confluence.macros.code, Version: 1.4)
TinyMCE Editor Plugin (com.atlassian.confluence.extra.tinymceplugin, Version: 2.9)
Page Menus Sections (confluence.pages.menus, Version: 1.0)
Voting Macros (com.nearinfinity.confluence.macros.vote, Version: 1.2)
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Clickr Theme (com.atlassian.confluence.themes.clickr, Version: 1.4)
Attachment Actions (confluence.sections.attachments, Version: 1.0)
IM Presence NG Plugin (confluence.extra.impresence2, Version: 2.0)
WebDAV Plugin (confluence.extra.webdav, Version: 1.1)
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Space Actions Sections (confluence.sections.space.actions, Version: 1.0)
Information Macros (confluence.extra.information, Version: 1.0)
Live Search Macros (confluence.extra.livesearch, Version: 2.6)
Global Labels Sections (confluence.sections.labels, Version: 1.0)
Page View Links (confluence.sections.page.actions, Version: 1.0)
Space Admin Sections (confluence.sections.space.admin, Version: 1.0)
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Page Tabs (confluence.sections.page, Version: 1.0)
BloggingRPC (com.atlassian.confluence.plugins.xmlrpc.bloggingrpc, Version: 1.2.2)
Dynamic Task List Macros (confluence.extra.dynamictasklist, Version: 1.8)
Attachment Extractors (confluence.extractors.attachments, Version: 1.4)
German language pack (confluence.languages.de_DE, Version: 1.1)
French language pack (confluence.languages.fr_FR, Version: 1.5)
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Edit Profile Sections (confluence.sections.profile.edit, Version: 1.0)
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User Listener (confluence.extra.userlister, Version: 2.3)
Tabular Metadata (confluence.extra.masterdetail, Version: 2.7)
Confluence Usage Stats (com.atlassian.confluence.ext.usage, Version: 0.8)
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Profile Tabs (confluence.sections.profile, Version: 1.0)
Request
Information:
URL: https://owe-server.domain.com/confluence/500page.jsp
 Scheme: https
 Server: owe-server.domain.com
 Port: 443
 URI: /confluence/500page.jsp
 - Context Path: /confluence
 - Servlet Path: /500page.jsp
 - Path Info:
 - Query String: membersOfGroupTerm=ais-admins
foofoo
Attributes:
 os_securityfilter_already_filtered : true
 javax.servlet.jsp.jspException : java.lang.ClassCastException
 com.atlassian.core.filters.gzip.GzipFilter_already_filtered : true
 atlassian.core.seraph.original.url : /admin/users/domembersofgroupsearch.action?membersOfGroupTerm=ais-admins
 javax.servlet.error.status_code : 500
 javax.servlet.error.servlet_name : action
 com.atlassian.johnson.filters.JohnsonFilter_already_filtered : true
 loginfilter.already.filtered : true
 Confluence-Request-Time : 1211223011043
 OC4J_UNPARSED_URI : /confluence/admin/users/domembersofgroupsearch.action
 webwork.valueStack : com.opensymphony.xwork.util.OgnlValueStack@18939a1
 sessioninview.FILTERED : true
 _sitemesh_filterapplied : true
 javax.servlet.error.exception : java.lang.ClassCastException
 javax.servlet.error.request_uri : /confluence/admin/users/domembersofgroupsearch.action
 javax.servlet.forward.request_uri : /confluence/admin/users/domembersofgroupsearch.action
 javax.servlet.forward.context_path : /confluence
 javax.servlet.forward.servlet_path : /admin/users/domembersofgroupsearch.action
 javax.servlet.forward.path_info : Error rendering logging information - uh oh. java.lang.NullPointerException at _500page._jspService(_500page.java:327) at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:59) at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:462) at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:594) at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:518) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:713) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370) at com.evermind.server.http.ServletRequestDispatcher.unprivileged_forward(ServletRequestDispatcher.java:259) at com.evermind.server.http.ServletRequestDispatcher.access$100(ServletRequestDispatcher.java:51) at com.evermind.server.http.ServletRequestDispatcher$2.oc4jRun(ServletRequestDispatcher.java:193) at oracle.oc4j.security.OC4JSecurity.doPrivileged(OC4JSecurity.java:283) at com.evermind.server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:198) at com.evermind.server.http.EvermindHttpServletResponse.sendError(EvermindHttpServletResponse.java:1264) at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:152) at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:152) at com.opensymphony.module.sitemesh.filter.PageResponseWrapper.sendError(PageResponseWrapper.java:176) at com.opensymphony.webwork.dispatcher.ServletDispatcher.sendError(ServletDispatcher.java:349) at com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletDispatcher.java:235) at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:199) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65) at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118) at com.atlassian.confluence.util.profiling.ProfilingPageFilter.parsePage(ProfilingPageFilter.java:124) at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:54) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:15) at com.atlassian.core.filters.ServletContextThreadLocalFilter.doFilter(ServletContextThreadLocalFilter.java:21) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.confluence.util.LoggingContextFilter.doFilter(LoggingContextFilter.java:49) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.confluence.util.UserThreadLocalFilter.doFilter(UserThreadLocalFilter.java:44) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:192) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.seraph.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:112) at com.atlassian.confluence.util.AbstractBootstrapHotSwappingFilter.doFilter(AbstractBootstrapHotSwappingFilter.java:28) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.seraph.filter.BaseLoginFilter.doFilter(BaseLoginFilter.java:110) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.confluence.util.ClusterHeaderFilter.doFilter(ClusterHeaderFilter.java:35) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.johnson.filters.AbstractJohnsonFilter.doFilter(AbstractJohnsonFilter.java:72) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at org.springframework.orm.hibernate.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:170) at com.atlassian.spring.filter.FlushingSpringSessionInViewFilter.doFilterInternal(FlushingSpringSessionInViewFilter.java:29) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:140) at com.atlassian.core.filters.ProfilingAndErrorFilter.doFilter(ProfilingAndErrorFilter.java:27) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.confluence.core.datetime.RequestTimeThreadLocalFilter.doFilter(RequestTimeThreadLocalFilter.java:34) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.confluence.util.RequestCacheThreadLocalFilter.doFilter(RequestCacheThreadLocalFilter.java:25) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.core.filters.gzip.GzipFilter.doFilter(GzipFilter.java:61) at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17) at com.atlassian.core.filters.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:33) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370) at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871) at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453) at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:302) at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:190) at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260) at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303) at java.lang.Thread.run(Thread.java:619)
Logging:
4 log statements generated by this request:
[ERROR] Mon May 19 11:50:11 PDT 2008 [com.atlassian.xwork.interceptors.XWorkTransactionInterceptor] Invoking rollback for transaction on action '/admin/users/domembersofgroupsearch.action (ViewMembersOfGroupAction.execute())' due to throwable: java.lang.ClassCastException
Throwable:
java.lang.ClassCastException
[ERROR] Mon May 19 11:50:11 PDT 2008 [com.opensymphony.webwork.dispatcher.ServletDispatcher] Could not execute action
Throwable:
java.lang.ClassCastException
[WARN] Mon May 19 11:50:11 PDT 2008 [com.atlassian.confluence.admin.actions.ViewSystemInfoAction] Attempting to retrieve database info without configured SessionFactory
[ERROR] Mon May 19 11:50:11 PDT 2008 [com.atlassian.confluence.admin.actions.SystemErrorInformationLogger] Build Information confluence.home = /opt/local/confluence-2.7.2 system.uptime = 17 days, 22 hours, 34 minutes system.version = 2.7.2 build.number = 1115 Request Unique ID : 0x0000011A028467DF86097AA30022C5AED89F23592B0CBC2BCA2ABF12723C9654Server Information:Application Server: Oracle Containers for J2EE 10g (10.1.3.3.0) Servlet Version:: 2.4 Database Dialect: net.sf.hibernate.dialect.Oracle9Dialect Database Driver Name: N/A Database Driver Version: N/A Database Name: N/A Database Version: N/A System Info system.date = Monday, 19 May 2008 system.time = 11:50:11 system.favourite.colour = Cinnabar java.version = 1.6.0_03 java.vendor = Sun Microsystems Inc. jvm.version = 1.0 jvm.vendor = Sun Microsystems Inc. jvm.implementation.version = 1.6.0_03-b05 java.runtime = Java(TM) SE Runtime Environment java.vm = Java HotSpot(TM) Server VM user.name.word = oracle user.timezone = America/Los_Angeles operating.system = Linux 2.4.21-37.0.1.ELsmp os.architecture = i386 fs.encoding = UTF-8 JVM Stats total.memory = 993 free.memory = 184 used.memory = 809 Cluster Information: Not clustered. Enabled Plugins: Confluence Attachments Plugin (confluence.extra.attachments, Version: 2.10) JIRA Macros (confluence.extra.jira, Version: 2.4.1) Social Bookmarking Plugin (com.atlassian.confluence.plugins.socialbookmarking, Version: 1.0.7) Admin Sections (confluence.sections.admin, Version: 1.0) Chart Plugin (confluence.extra.chart, Version: 1.9) Left Navigation Theme (com.atlassian.confluence.themes.leftnavigation, Version: 1.5.1) Confluence Remote API (confluence.extra.confluencerpc, Version: 2.7.2) Page Operations (confluence.sections.page.operations, Version: 1.0) Advanced Macros (confluence.macros.advanced, Version: 1.3) Code Macro (confluence.macros.code, Version: 1.4) TinyMCE Editor Plugin (com.atlassian.confluence.extra.tinymceplugin, Version: 2.9) Page Menus Sections (confluence.pages.menus, Version: 1.0) Voting Macros (com.nearinfinity.confluence.macros.vote, Version: 1.2) Table of Contents Plugin (org.randombits.confluence.toc, Version: 2.4.1) Atlassian Plugin Repository (confluence.repository.client, Version: 2.0.12) Confluence Classic Theme (com.atlassian.confluence.themes.classic, Version: 1.3) Space Advanced Sections (confluence.sections.space.advanced, Version: 1.0) Clickr Theme (com.atlassian.confluence.themes.clickr, Version: 1.4) Attachment Actions (confluence.sections.attachments, Version: 1.0) IM Presence NG Plugin (confluence.extra.impresence2, Version: 2.0) WebDAV Plugin (confluence.extra.webdav, Version: 1.1) Space Labels Sections (confluence.sections.space.labels, Version: 1.0) Space Actions Sections (confluence.sections.space.actions, Version: 1.0) Information Macros (confluence.extra.information, Version: 1.0) Live Search Macros (confluence.extra.livesearch, Version: 2.6) Global Labels Sections (confluence.sections.labels, Version: 1.0) Page View Links (confluence.sections.page.actions, Version: 1.0) Space Admin Sections (confluence.sections.space.admin, Version: 1.0) Core Listeners (confluence.listeners.core, Version: 1.3) Space Item Tabs (confluence.sections.space, Version: 1.0) Task List Macros (confluence.extra.tasklist, Version: 3) Space Pages Sections (confluence.sections.space.pages, Version: 1.0) Page Tabs (confluence.sections.page, Version: 1.0) BloggingRPC (com.atlassian.confluence.plugins.xmlrpc.bloggingrpc, Version: 1.2.2) Dynamic Task List Macros (confluence.extra.dynamictasklist, Version: 1.8) Attachment Extractors (confluence.extractors.attachments, Version: 1.4) German language pack (confluence.languages.de_DE, Version: 1.1) French language pack (confluence.languages.fr_FR, Version: 1.5) News Tabs (confluence.sections.news, Version: 1.0) Basic Macros (confluence.macros.basic, Version: 1.3) Core Extractors (confluence.extractors.core, Version: 1.4) Core Startup and Shutdown (confluence.lifecycle.core, Version: 1) Compatibility Macros (confluence.macros.compatibility, Version: 1.3) Dashboard Macros (confluence.macros.dashboard, Version: 1.3) Edit Profile Sections (confluence.sections.profile.edit, Version: 1.0) Confluence Contributors Plugin (com.atlassian.confluence.contributors, Version: 1.1) User Listener (confluence.extra.userlister, Version: 2.3) Tabular Metadata (confluence.extra.masterdetail, Version: 2.7) Confluence Usage Stats (com.atlassian.confluence.ext.usage, Version: 0.8) Layout Macros (confluence.extra.layout, Version: 1.1) Profile Tabs (confluence.sections.profile, Version: 1.0) Request Information: URL: https://owe-server.domain.com/confluence/500page.jsp Scheme: https Server: owe-server.domain.com Port: 443 URI: /confluence/500page.jsp Context Path: /confluence Servlet Path: /500page.jsp Path Info: null Query String: membersOfGroupTerm=ais-admins Attributes: os_securityfilter_already_filtered: true javax.servlet.jsp.jspException: java.lang.ClassCastException com.atlassian.core.filters.gzip.GzipFilter_already_filtered: true atlassian.core.seraph.original.url: /admin/users/domembersofgroupsearch.action?membersOfGroupTerm=ais-admins javax.servlet.error.status_code: 500 javax.servlet.error.servlet_name: action com.atlassian.johnson.filters.JohnsonFilter_already_filtered: true loginfilter.already.filtered: true Confluence-Request-Time: 1211223011043 OC4J_UNPARSED_URI: /confluence/admin/users/domembersofgroupsearch.action webwork.valueStack: com.opensymphony.xwork.util.OgnlValueStack@18939a1 sessioninview.FILTERED: true _sitemesh_filterapplied: true javax.servlet.error.exception: java.lang.ClassCastException javax.servlet.error.request_uri: /confluence/admin/users/domembersofgroupsearch.action javax.servlet.forward.request_uri: /confluence/admin/users/domembersofgroupsearch.action javax.servlet.forward.context_path: /confluence javax.servlet.forward.servlet_path: /admin/users/domembersofgroupsearch.action javax.servlet.forward.path_info: null javax.servlet.forward.query_string: membersOfGroupTerm=ais-admins Parameters: membersOfGroupTerm : ais-admins