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JForum Problem

 
Greenhorn
Posts: 1
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When I 'am installing JForum, clicking button "Begin install",a problem occured as following:

An error has occurred.

For detailed error information, please see the HTML source code, and contact the forum Administrator.

java.lang.NullPointerException

and the HTML source code is:
<!-- BEGIN ERROR STACK TRACE
net.jforum.exceptions.ForumException: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at net.jforum.Command.process(Command.java:114)
at net.jforum.view.install.InstallAction.process(InstallAction.java:915)
at net.jforum.InstallServlet.service(InstallServlet.java:141)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at net.jforum.util.legacy.clickstream.ClickstreamFilter.doFilter(ClickstreamFilter.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.reflect.InvocationTargetException
... 23 more
Caused by: java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:394)
at net.jforum.util.preferences.SystemGlobals.setValue(SystemGlobals.java:155)
at net.jforum.view.install.InstallAction.configureDatabase(InstallAction.java:652)
at net.jforum.view.install.InstallAction.doInstall(InstallAction.java:172)
... 23 more

URL is: /jforum/install/install.page?null
END ERROR STACK TRACE-->
-_20121217113608.jpg
[Thumbnail for -_20121217113608.jpg]
my configuration
 
Bartender
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Netbeans IDE Java Ubuntu
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Hi darcy,
Welcome to the Ranch!

In the first screen of the installation wizard, I guess you chose the connection type as DataSource - in that case, you should fill in the name of the data source in the 'DataSource name' field - this may not be obvious, because I think this field is shown as optional.
 
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