[Using Sakai] [Building Sakai] Quizz issue
Steve Swinsburg
steve.swinsburg at gmail.com
Tue Sep 23 00:48:13 PDT 2014
I've never seen this in Sakai before and from the looks of the stack traces
it is tomcat related. What version tomcat and Java are you using?
Cheers
Steve
sent from my mobile
On 23/09/2014 1:30 AM, "Biku Shrestha" <blshrestha at mum.edu> wrote:
> Let me further clarify this issue:
>
>
>
> We have had ongoing problems with quizzes.
>
>
>
> It seems that when we have a class taking a quiz with more than a small
> number of students (perhaps 20-30), then all sorts of problems arise.
>
>
>
> Students report getting logged off, and results getting lost, and logging
> back in. The quizzes would sometimes go blank, and then log the student
> off. After a few questions, Sakai gives a syntax error. Browser repeatedly
> logged students out. The questions disappears some items and shows a
> message: “Validation Error”. Sometimes this happens after 20+ questions,
> going to the “next” question. Long delays when going to the next question;
> the times keeps running and the spinner moving, but no question for over a
> minute sometimes. Etc… (These are from the student reports…).
>
>
>
> We are on 9.2, planning to go to 10.0 soon.
>
> Last time we had a bunch of problems we increased the JVM memory (6 GB),
> and things improved.
>
>
>
> Any ideas or hints on this sort of problems, or diagnostics, or solutions?
> The error message in log is shown below.
>
>
>
> Sep 20, 2014 10:02:16 AM org.apache.coyote.http11.AbstractHttp11Processor
> endRequest
>
> SEVERE: Error finishing response
>
> java.lang.NullPointerException
>
> at
> org.apache.coyote.http11.InternalNioOutputBuffer.flushBuffer(InternalNioOutputBuffer.java:243)
>
> at
> org.apache.coyote.http11.InternalNioOutputBuffer.endRequest(InternalNioOutputBuffer.java:128)
>
> at
> org.apache.coyote.http11.AbstractHttp11Processor.endRequest(AbstractHttp11Processor.java:1290)
>
> at
> org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:360)
>
> at
> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
>
> at
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1544)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>
> at java.lang.Thread.run(Thread.java:662)
>
>
>
>
>
> Sep 20, 2014 10:02:39 AM org.apache.catalina.connector.CoyoteAdapter log
>
> WARNING: Exception while attempting to add an entry to the access log
>
> java.lang.StringIndexOutOfBoundsException: String index out of range: -795
>
> at java.lang.String.checkBounds(String.java:397)
>
> at java.lang.String.<init>(String.java:482)
>
> at
> org.apache.tomcat.util.buf.ByteChunk.toStringInternal(ByteChunk.java:505)
>
> at
> org.apache.tomcat.util.buf.StringCache.toString(StringCache.java:320)
>
> at org.apache.tomcat.util.buf.ByteChunk.toString(ByteChunk.java:496)
>
> at
> org.apache.tomcat.util.buf.MessageBytes.toString(MessageBytes.java:189)
>
> at
> org.apache.catalina.connector.Request.getRequestURI(Request.java:2178)
>
> at
> org.apache.catalina.valves.AccessLogValve$RequestElement.addElement(AccessLogValve.java:1567)
>
> at
> org.apache.catalina.valves.AccessLogValve.log(AccessLogValve.java:955)
>
> at
> org.apache.catalina.core.AccessLogAdapter.log(AccessLogAdapter.java:51)
>
> at
> org.apache.catalina.core.StandardEngine.logAccess(StandardEngine.java:371)
>
> at
> org.apache.catalina.connector.CoyoteAdapter.log(CoyoteAdapter.java:508)
>
> at
> org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:348)
>
> at
> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
>
> at
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1544)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>
> at java.lang.Thread.run(Thread.java:662)
>
>
>
> Thank you.
>
>
>
> Biku
>
>
>
> *From:* Biku Shrestha
> *Sent:* Sunday, September 21, 2014 11:10 PM
> *To:* 'sakai-user at collab.sakaiproject.org'
> *Cc:* 'sakai-dev at collab.sakaiproject.org'
> *Subject:* Quizz issue
>
>
>
> Hi,
>
>
>
> We have Sakai 2.9.2. We are experiencing some issues with the quizzes.
>
>
>
> 1. For some students, the quiz page is blank
>
> 2. For others: after couple of questions, they get syntax error
> message on the screen.
>
>
>
> I checked the logs and found following errors:
>
>
>
> Any ideas?
>
>
>
> Thank you.
>
> Biku
>
>
>
> Sep 20, 2014 10:02:16 AM org.apache.coyote.http11.AbstractHttp11Processor
> endRequest
>
> SEVERE: Error finishing response
>
> java.lang.NullPointerException
>
> at
> org.apache.coyote.http11.InternalNioOutputBuffer.flushBuffer(InternalNioOutputBuffer.java:243)
>
> at
> org.apache.coyote.http11.InternalNioOutputBuffer.endRequest(InternalNioOutputBuffer.java:128)
>
> at
> org.apache.coyote.http11.AbstractHttp11Processor.endRequest(AbstractHttp11Processor.java:1290)
>
> at
> org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:360)
>
> at
> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
>
> at
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1544)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>
> at java.lang.Thread.run(Thread.java:662)
>
>
>
>
>
> Sep 20, 2014 10:02:39 AM org.apache.catalina.connector.CoyoteAdapter log
>
> WARNING: Exception while attempting to add an entry to the access log
>
> java.lang.StringIndexOutOfBoundsException: String index out of range: -795
>
> at java.lang.String.checkBounds(String.java:397)
>
> at java.lang.String.<init>(String.java:482)
>
> at
> org.apache.tomcat.util.buf.ByteChunk.toStringInternal(ByteChunk.java:505)
>
> at
> org.apache.tomcat.util.buf.StringCache.toString(StringCache.java:320)
>
> at org.apache.tomcat.util.buf.ByteChunk.toString(ByteChunk.java:496)
>
> at
> org.apache.tomcat.util.buf.MessageBytes.toString(MessageBytes.java:189)
>
> at
> org.apache.catalina.connector.Request.getRequestURI(Request.java:2178)
>
> at
> org.apache.catalina.valves.AccessLogValve$RequestElement.addElement(AccessLogValve.java:1567)
>
> at
> org.apache.catalina.valves.AccessLogValve.log(AccessLogValve.java:955)
>
> at
> org.apache.catalina.core.AccessLogAdapter.log(AccessLogAdapter.java:51)
>
> at
> org.apache.catalina.core.StandardEngine.logAccess(StandardEngine.java:371)
>
> at
> org.apache.catalina.connector.CoyoteAdapter.log(CoyoteAdapter.java:508)
>
> at
> org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:348)
>
> at
> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
>
> at
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1544)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>
> at java.lang.Thread.run(Thread.java:662)
>
>
>
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