Error after browsing the Forum for some time

[Migrated From Jforum.net]

Hi,

i am having some Problems with Version 2.1.6 of JForum. It is running on SUSE Linux 10.0 with java-1_4_2-sun-devel-1.4.2.11-1.1, tomcat5-5.0.30-4 and apache2-2.0.54-10.8 connected via mod_jk (all are the stock packages). After startup the forum runs fine, until i click the "back to startpage" link. After that following Stacktrace occours:

<!-- BEGIN ERROR STACK TRACE <br /> java.lang.reflect.InvocationTargetException <br /> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) <br /> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) <br /> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) <br /> at java.lang.reflect.Method.invoke(Method.java:324) <br /> at net.jforum.Command.process(Command.java:116) <br /> at net.jforum.JForum.service(JForum.java:182) <br /> at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) <br /> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) <br /> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) <br /> at net.jforum.util.legacy.clickstream.ClickstreamFilter.doFilter(ClickstreamFilter.java:59) <br /> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) <br /> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) <br /> at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214) <br /> at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) <br /> at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) <br /> at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198) <br /> at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152) <br /> at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) <br /> at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) <br /> at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) <br /> at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) <br /> at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118) <br /> at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) <br /> at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) <br /> at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) <br /> at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) <br /> at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) <br /> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) <br /> at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) <br /> at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:300) <br /> at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:374) <br /> at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:743) <br /> at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:675) <br /> at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:866) <br /> at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) <br /> at java.lang.Thread.run(Thread.java:534) <br /> Caused by: java.lang.NullPointerException <br /> at net.jforum.repository.ForumRepository.getTotalMessages(ForumRepository.java:699) <br /> at net.jforum.repository.ForumRepository.getTotalMessages(ForumRepository.java:684) <br /> at net.jforum.view.forum.ForumAction.list(ForumAction.java:93) <br /> ... 36 more <br /> <br /> END ERROR STACK TRACE-->

Are there some more info i can provide?

cheers,

Martin
[originally posted on jforum.net by mjakob]

[Migrated From Jforum.net]

Have you configured the "back to home page" URL in the Admin Console (the "Website URL" line)? That should point to the referring web page that you have JForum linked on. Also, don't forget the trailing "/" on the "Forum URL" too.

I'm running a similar config as you, but on Hardened Gentoo, Tomcat 5.0.28, and Apache 2 with mod_jk and I don't see this type of error. I'm using JForum 2.1.6 with CVS updates as of Sept. 9.
[originally posted on jforum.net by GatorBait3]

[Migrated From Jforum.net]

Yes, the "back-link" was configured correctly, trailing-slash and all.
Luckily it was a freshly installed forum and just given to the forumadmin. On the Mainpage there was one forum with one topic and one message. But when you entered the forum it was empty. Going back to the startpage produced the posted error.
I browsed the (hsqldb-)database with sqirrelsql, but i could not find any entries in the topic and message table.
Deleting and recreating the forum fixed the problem. I have no idea how this could have happened.
So the current problem is solved, but it is unclear how the database could get in such a state.

Is there a way to check the database for consistence?
[originally posted on jforum.net by mjakob]

[Migrated From Jforum.net]

Very strange ...

I don't use HSQLDB, so I'm not familiar with utilities or commands for consistency checking .. you may want to try Googling it.

[originally posted on jforum.net by GatorBait3]

[Migrated From Jforum.net]

This is a silly bug on version 2.1.6. It is already fixed in the cvs (2.1.7).

If you can get it (http://www.jforum.net/development.jsp), that would be the best to do.

Rafael
[originally posted on jforum.net by Rafael Steil]

[Migrated From Jforum.net]

Sorry, for coming back so late.

The mentioned hacking in the database was not successful. But changing all links from an "empty" path to .../forums/list.page fixed the problem for us. Has this something to do with mod_jk? another forum, where Tomcat listens on port 80 has never seen this problem.
For new instances i will use 2.17

cheers

Martin
[originally posted on jforum.net by mjakob]

[Migrated From Jforum.net]

Try it:

http://www.jforum.net/beta/latest_dev.jsp

Rafael
[originally posted on jforum.net by Rafael Steil]

[Migrated From Jforum.net]

\u7ba1\u7406
[originally posted on jforum.net by huhpreal]