Internal Server error after pressing ticket comment twice

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Create a ticket with a commit
2. Add a comment 
3. Press "comment" two times

What is the expected output? What do you see instead?
I would expect that a reload of the page happens and the comment is added once. 
Instead I end up with an "internal Server" error.

What version of the product are you using? On what operating system?
1.6.2 WAR in Tomcat on Red Hat Linux 7

Please provide any additional information below.

Exported Ticket info:

{
    "body": "",
    "changes": [
        {
            "author": "user1",
            "date": "2015-02-11T15:50:16Z",
            "fields": {
                "body": "",
                "mergeTo": "build700",
                "status": "New",
                "title": "Add initial solarisstudio module",
                "type": "Proposal",
                "watchers": "+user1"
            },
            "patchset": {
                "added": 0,
                "base": "3d4d77aa180a3ec05b67905c3415a6a949450ae5",
                "commits": 1,
                "deletions": 0,
                "insertions": 213,
                "number": 1,
                "rev": 1,
                "tip": "85becf4c1445870ddd23e5999b5a7e096b476727",
                "type": "Proposal"
            }
        },
        {
            "author": "user1",
            "date": "2015-02-12T07:36:18Z",
            "fields": {
                "responsible": "user2",
                "watchers": "+user2"
            }
        },
        {
            "author": "user1",
            "comment": {
                "id": "2ff36394768c478220a9c9b86187cc75da387954",
                "text": "Package name is wrong / packages are missing.\nI don't think that there is a service that needs to be running."
            },
            "date": "2015-02-12T07:37:10Z"
        },
        {
            "author": "user1",
            "comment": {
                "id": "e47d26603e663fc36e6297f20d19fac9bfa75dc7",
                "text": "Package name is wrong / packages are missing.\nI don't think that there is a service that needs to be running."
            },
            "date": "2015-02-12T07:37:12Z"
        }
    ],
    "created": "2015-02-11T15:50:16Z",
    "createdBy": "user1",
    "deletions": 0,
    "insertions": 213,
    "mergeTo": "build700",
    "number": 4,
    "project": "CIT",
    "repository": "department1/IT/puppet_rhel.git",
    "responsible": "user2",
    "status": "New",
    "title": "Add initial solarisstudio module",
    "type": "Proposal",
    "updated": "2015-02-12T07:37:12Z",
    "updatedBy": "user1"
}

Original issue reported on code.google.com by henning....@gmail.com on 12 Feb 2015 at 7:51

[GoogleCodeExporter]

2015-02-12 09:33:12 [ERROR] Error attaching this container for rendering: 
[MarkupContainer [Component id = discussion]]
org.apache.wicket.WicketRuntimeException: Error attaching this container for 
rendering: [MarkupContainer [Component id = discussion]]
        at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1789)
        at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
        at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
        at org.apache.wicket.Component.beforeRender(Component.java:1103)
        at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
        at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
        at org.apache.wicket.Page.onBeforeRender(Page.java:1555)
        at com.gitblit.wicket.pages.BasePage.onBeforeRender(BasePage.java:152)
        at com.gitblit.wicket.pages.RepositoryPage.onBeforeRender(RepositoryPage.java:657)
        at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
        at org.apache.wicket.Component.beforeRender(Component.java:1103)
        at org.apache.wicket.Component.prepareForRender(Component.java:2297)
        at org.apache.wicket.Page.prepareForRender(Page.java:1545)
        at org.apache.wicket.Component.prepareForRender(Component.java:2329)
        at org.apache.wicket.Page.renderPage(Page.java:912)
        at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:261)
        at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105)
        at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1287)
        at org.apache.wicket.RequestCycle.step(RequestCycle.java:1358)
        at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1465)
        at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
        at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486)
        at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:319)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.gitblit.servlet.EnforceAuthenticationFilter.doFilter(EnforceAuthenticationFilter.java:87)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.gitblit.servlet.ProxyFilter$1.doFilter(ProxyFilter.java:74)
        at com.gitblit.servlet.ProxyFilter.doFilter(ProxyFilter.java:77)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
        at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException

Original comment by henning....@gmail.com on 12 Feb 2015 at 8:34

[GoogleCodeExporter]

Tomcat makes me sad, but it should work better than that.  There was a little 
more to the stacktrace.  Namely the NullPointer part.  I'm not sure if that 
will be useful, but upper part of the stacktrace is basically just noise.

Original comment by James.Mo...@gmail.com on 18 Feb 2015 at 4:47