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From Daniel Mikusa <dmik...@vmware.com>
Subject Re: NPE in SlowQuery
Date Tue, 02 Apr 2013 12:43:52 GMT
On Apr 2, 2013, at 8:15 AM, Tomasz Kowalczewski wrote:

> Hello all,
> 
> we are running Tomcat 7 on Amazon EC2:
> 
> Server version: Apache Tomcat/7.0.22
> Server built:   Sep 27 2011 09:40:50
> Server number:  7.0.22.0

As you can see from the date, this version is getting to be pretty old.  You should consider
upgrading.

> OS Name:        Linux
> OS Version:     2.6.34.7-56.40.amzn1.i686
> Architecture:   i386
> JVM Version:    1.7.0_03-b04
> 
> And get following exception on slow queries:
> 
> [catalina-exec-18] 04-02 10:27:11 ERROR TransactionInterceptor:414 -
> Application exception overridden by rollback exception
> java.lang.NullPointerException
>               at
> org.apache.tomcat.jdbc.pool.interceptor.SlowQueryReport.reportFailedQuery(SlowQueryReport.java:86)
>               at
> org.apache.tomcat.jdbc.pool.interceptor.AbstractQueryReport$StatementProxy.invoke(AbstractQueryReport.java:237)
> 
> I wasn't able to google for a solution/bugfix therefore I would like
> to ask the Tomcat community for help on this issue. Is this a known
> bug?

There are a couple NPE's reported here.  Could be what you are seeing…

   https://issues.apache.org/bugzilla/show_bug.cgi?id=51582

Probably would be best if you could upgrade to the latest release and see if the problem still
continues.  If you can't upgrade Tomcat, at least upgrade the jdbc-pool jar.

Dan


> 
> When looking at the source code:
> 
> 85:  QueryStats qs = this.getQueryStats(sql);
> 86:  qs.failure(delta, now);
> 
> It looks like getQueryStats(sql) returned null and indeed it does so
> on at leas one ocassion:
> 
>     protected QueryStats getQueryStats(String sql) {
>          if (sql==null) sql = "";
>          ConcurrentHashMap<String,QueryStats> queries =
> SlowQueryReport.this.queries;
>>>       if (queries==null) return null;
> 
> However, non of the uses of getQueryStats() in SlowQueryReport guard
> against this null. It seems to be a bug.
> 
> --
> Regards,
> Tomasz Kowalczewski
> 
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