Forum Problems Installing LAMS: Blank Screen displayed on accessing LAMS url


 
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1: Blank Screen displayed on accessing LAMS url
08/08/07 12:00 AM
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Hi,

When i try to login into the LAMS server http://localhost:8080/lams/, a blank screen is displayed with following exception on console.

Could somebody please advice what is wrong?

Thanks in advance!

With Regards
Bhavesh R Bhanushali

-------

11:26:57,357 INFO [Server] JBoss (MX MicroKernel) [4.0.2 (build: CVSTag=JBoss_4
_0_2 date=200505022023)] Started in 3m:1s:51ms
11:28:15,296 DEBUG [SingleSignOn] Process request for '/'
11:28:15,296 ERROR [CoyoteAdapter] An exception or error occurred in the contain
er during the request processing
java.lang.NullPointerException
at org.lamsfoundation.lams.integration.security.SingleSignOn.invoke(Sing
leSignOn.java:56)
at org.lamsfoundation.lams.integration.security.LoginRequestValve.invoke
(LoginRequestValve.java:67)
at org.apache.catalina.valves.FastCommonAccessLogValve.invoke(FastCommon
AccessLogValve.java:481)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor
kerThread.java:112)
at java.lang.Thread.run(Thread.java:595)
11:28:16,374 DEBUG [SingleSignOn] Process request for '/'
-------

Posted by Bhavesh Bhanushali

2: Re: Blank Screen displayed on accessing LAMS url
In response to 1 08/19/07 06:12 PM
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Is this still an issue Bhavesh?

I've had a look at the code for the SingleSignOn class for that line, and I can't see why it would be throwing a null pointer exception. The line itself (line 56) in our current source code is just "String username = null;" and none of the lines around it look like anything that could throw a NullPointerException.

Could you send us a copy of the server logs so I can check the debugging - there is quite a bit of debugging in that method. See Creating DEBUG Logs on the wiki for the blurb on what's what with the logs.

Fiona

Posted by Fiona Malikoff

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