Null Pointer Exception when uploading images

Steps for re-creating:
Create a new page, add text content and save.
Edit page (and change to wiki markup mode)
Click "Insert Image" icon
Browse to image to add, click Attach.

NullPointerException occurs. There are no attachments when this icon is clicked. - This is probably the reason for the error.

Cause:
java.lang.NullPointerException
at com.atlassian.confluence.pages.actions.InsertImageLinkAction.validateUpload(InsertImageLinkAction.java:56)

Stack Trace: [hide]

java.lang.NullPointerException
at com.atlassian.confluence.pages.actions.InsertImageLinkAction.validateUpload(InsertImageLinkAction.java:56)
at com.atlassian.confluence.pages.actions.InsertImageLinkAction.execute(InsertImageLinkAction.java:71)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.intercept(DefaultWorkflowInterceptor.java:55)
at com.atlassian.confluence.core.ConfluenceWorkflowInterceptor.intercept(ConfluenceWorkflowInterceptor.java:39)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.atlassian.confluence.core.ConfluenceValidationInterceptor.intercept(ConfluenceValidationInterceptor.java:16)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.atlassian.confluence.security.actions.PermissionCheckInterceptor.intercept(PermissionCheckInterceptor.java:39)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.atlassian.confluence.pages.actions.PageAwareInterceptor.intercept(PageAwareInterceptor.java:114)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.atlassian.confluence.spaces.actions.SpaceAwareInterceptor.intercept(SpaceAwareInterceptor.java:82)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.atlassian.confluence.core.actions.LastModifiedInterceptor.intercept(LastModifiedInterceptor.java:39)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.atlassian.confluence.core.ConfluenceAutowireInterceptor.intercept(ConfluenceAutowireInterceptor.java:25)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.atlassian.confluence.util.XWorkTransactionInterceptor.intercept(XWorkTransactionInterceptor.java:133)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:115)
at com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletDispatcher.java:229)
at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:199)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
at com.atlassian.confluence.util.profiling.ProfilingPageFilter.parsePage(ProfilingPageFilter.java:143)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.atlassian.confluence.util.ServletContextThreadLocalFilter.doFilter(ServletContextThreadLocalFilter.java:30)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.atlassian.confluence.util.UserThreadLocalFilter.doFilter(UserThreadLocalFilter.java:45)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:182)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:181)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.atlassian.johnson.filters.JohnsonFilter.doFilter(JohnsonFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.springframework.orm.hibernate.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:170)
at bucket.custom.FlushingSpringSessionInViewFilter.doFilterInternal(FlushingSpringSessionInViewFilter.java:31)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:73)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:122)
at com.atlassian.confluence.util.error.ProfilingAndErrorFilter.doFilter(ProfilingAndErrorFilter.java:27)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.atlassian.core.filters.gzip.GzipFilter.doFilter(GzipFilter.java:61)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.atlassian.core.filters.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:37)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)

Referer URL: http://wiki:8080/confluence/users/insertimagelink.action?pageId=6132&currentspace=~smithd&formname=editpageform&fieldname=content&mode=search

Build Information:
Confluence Home: /var/lib/confluence
Uptime: 5 days, 15 hours, 23 minutes, 24 seconds
Version: 2.2.4
Build Number: 519

Server Information:
Application Server: Apache Tomcat/5.5.15
Servlet Version: 2.4
Database Dialect: bucket.dialect.MySQLDialect
Database Driver Name: com.mysql.jdbc.Driver
Database Driver Version: 3.1

Memory Information:
Total Memory: 492 MB
Free Memory: 107 MB
Used Memory: 385 MB

System Information:
System Date: Monday, 03 Jul 2006
System Time: 16:08:40
System Favourite Colour: Taupe
Java Version: 1.5.0_05
Java Vendor: Sun Microsystems Inc.
JVM Version: 1.0
JVM Vendor: Sun Microsystems Inc.
JVM Implementation Version: 1.5.0_05-b05
Java Runtime: Java(TM) 2 Runtime Environment, Standard Edition
Java VM: Java HotSpot(TM) Server VM
User Name: root
User Timezone: Africa/Monrovia
Operating System: Linux 2.6.9-34.0.1.ELsmp
OS Architecture: i386
Filesystem Encoding: UTF-8

Enabled Plugins:
Page Tabs (confluence.sections.page, Version: 1.0)
Basic Macros (confluence.macros.basic, Version: 1.3)
Core Listeners (confluence.listeners.core, Version: 1.3)
Dashboard Macros (confluence.macros.dashboard, Version: 1.3)
User Listener (confluence.extra.userlister, Version: 1.2)
Chart Plugin (confluence.extra.chart, Version: 1.5)
Live Search Macros (confluence.extra.livesearch, Version: 1.3)
Information Macros (confluence.extra.information, Version: 0.1)
Global Labels Sections (confluence.sections.labels, Version: 1.0)
JIRA Macros (confluence.extra.jira, Version: 1.4)
Layout Macros (confluence.extra.layout, Version: 0.1)
Profile Tabs (confluence.sections.profile, Version: 1.0)
Confluence Remote API (confluence.extra.confluencerpc, Version: 1.4)
Admin Sections (confluence.sections.admin, Version: 1.0)
Navigation Macros (com.pentec.confluence.navigation, Version: 1.10)
Tabular Metadata (confluence.extra.masterdetail, Version: 1.0)
Space Admin Sections (confluence.sections.space.admin, Version: 1.0)
Space Pages Sections (confluence.sections.space.pages, Version: 1.0)
Calendar Plugin (confluence.extra.calendar, Version: 2.1.7)
Confluence Repository Client (confluence.repository.client, Version: 1.2)
Advanced Macros (confluence.macros.advanced, Version: 1.3)
Space Advanced Sections (confluence.sections.space.advanced, Version: 1.0)
News Tabs (confluence.sections.news, Version: 1.0)
IM Presence Macros (confluence.extra.impresence, Version: 0.1)
Attachments Macros (confluence.extra.attachments, Version: 1.3)
Edit Profile Sections (confluence.sections.profile.edit, Version: 1.0)
Content Formatting Macros (com.adaptavist.confluence.contentFormattingMacros, Version: 1.0)
Space Actions Sections (confluence.sections.space.actions, Version: 1.0)
Task List Macros (confluence.extra.tasklist, Version: 1.3)
Space Labels Sections (confluence.sections.space.labels, Version: 1.0)
Attachment Extractors (confluence.extractors.attachments, Version: 1.4)
Left Navigation Theme (com.atlassian.confluence.themes.leftnavigation, Version: 1.0)
Dynamic Task List Macros (confluence.extra.dynamictasklist, Version: 1.3)
Core Extractors (confluence.extractors.core, Version: 1.4)
Compatibility Macros (confluence.macros.compatibility, Version: 1.3)
Code Macro (confluence.macros.code, Version: 1.4)
Space Item Tabs (confluence.sections.space, Version: 1.0)
Request

Information:
URL: http://wiki:8080/confluence/500page.jsp

• Scheme: http
• Server: wiki
• Port: 8080
• URI: /confluence/500page.jsp
• - Context Path: /confluence
• - Servlet Path: /500page.jsp
• - Path Info: null
• - Query String: null

Attributes:

• javax.servlet.forward.request_uri : /confluence/users/upload-file-inside-popup.action
• javax.servlet.forward.context_path : /confluence
• javax.servlet.forward.servlet_path : /users/upload-file-inside-popup.action
• javax.servlet.forward.path_info : /500page.jsp
• javax.servlet.error.exception : java.lang.NullPointerException
• javax.servlet.error.message :
• os_securityfilter_already_filtered : true
• com.atlassian.johnson.filters.JohnsonFilter_already_filtered : true
• _sitemesh_using_stream : false
• javax.servlet.error.request_uri : /confluence/users/upload-file-inside-popup.action
• javax.servlet.error.status_code : 500
• _sitemesh_filterapplied : true
• javax.servlet.error.servlet_name : action
• webwork.valueStack : com.opensymphony.xwork.util.OgnlValueStack@1f33632
• loginfilter.already.filtered : true
• atlassian.core.seraph.original.url : /users/upload-file-inside-popup.action
• javax.servlet.jsp.jspException : java.lang.NullPointerException
• sessioninview.FILTERED : true
• com.atlassian.core.filters.gzip.GzipFilter_already_filtered : true

Parameters:
Confluence User:

• anonymous

Logging:
0 log statements generated by this request.