[Building Sakai] Quizz issue
Steve Swinsburg
steve.swinsburg at gmail.com
Tue Sep 23 13:14:45 PDT 2014
First step is to upgrade Tomcat. You are 34 releases behind the most
current.
cheers,
Steve
On Wed, Sep 24, 2014 at 2:05 AM, Biku Shrestha <blshrestha at mum.edu> wrote:
> We have Java 1.6.29 and Tomcat 7.0.21.
>
>
>
> Thank you.
>
>
>
> Biku
>
>
>
> *From:* Steve Swinsburg [mailto:steve.swinsburg at gmail.com]
> *Sent:* Tuesday, September 23, 2014 2:48 AM
> *To:* Biku Shrestha
> *Cc:* sakai-user at collab.sakaiproject.org; sakai-dev
> *Subject:* Re: [Building Sakai] Quizz issue
>
>
>
> 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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