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From André Warnier (tomcat) ...@ice-sa.com>
Subject Re: AW: AW: Tomcat 6, DB2 Driver Problems
Date Thu, 29 Oct 2015 08:16:54 GMT
On 29.10.2015 09:09, Simone.Rodenbach.ext@devk.de wrote:
> Hi Christopher,
>
> I attachted some pictures of the threads.
>
> Thx,
>   Simone
>

Hi Simone.
Christopher is in the USA, so it will take some time before he responds.
For the sake of gaining some time however : your attachments did not make it to the list,

which strips most attachments.
Better : use a text editor to cut and paste the stack trace right here :



>
>
> -----Ursprüngliche Nachricht-----
> Von: Christopher Schultz [mailto:chris@christopherschultz.net]
> Gesendet: Mittwoch, 28. Oktober 2015 15:30
> An: Tomcat Users List
> Betreff: Re: AW: Tomcat 6, DB2 Driver Problems
>
> Simone,
>
> On 10/28/15 4:02 AM, Simone.Rodenbach.ext@devk.de wrote:
>> I tried to google for the driver and classloader and found nothing that helped me
:-(
>
>> I can only provide you with this information:
>>
>> I configured the datasource in the context.xml
>>
>> <Resource name="jdbc/xxx" auth="Container" type="javax.sql.DataSource"
>> factory="org.apache.commons.dbcp.BasicDataSourceFactory"
>
> Why are you overriding Tomcat's default DataSourceFactory with another one?
>
>> maxActive="10" minIdle="2" maxIdle="10" maxWait="10000"
>> minEvictableIdleTimeMillis="120000" timeBetweenEvictionRunsMillis="60000"
>> username="xxx"
>>          password="xxx"
>> driverClassName="com.ibm.db2.jcc.DB2Driver"
>> url="xxx;"
>> validationQuery="select 1 from sysibm.sysdummy1" />
>>
>>
>> The spring bean
>>
>> <jee:jndi-lookup id="dataSource" jndi-name="java:/comp/env/jdbc/xxx" expected-type="javax.sql.DataSource"
/>
>>
>> I created a test project. Because oft hat I'm sure that I don't start a thread.
>
> It doesn't have to be *your code* starting the thread directly. JDBC
> drivers have a habit of launching their own cleanup threads and then not
> offering any interface to stop them.
>
>> But the log says:
>>
>> Okt 28, 2015 8:41:15 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
>> SCHWERWIEGEND: The web application [/test] appears to have started a thread named
[Timer-0] but has failed to stop it. This is very likely to create a memory leak.
>>
>> I think this thread is started from org.apache.commons.dbcp.BasicDataSourceFactory.
>
> Nope, BasicDataSourceFactory doesn't have the word "thread" anywhere in
> its code:
> http://svn.apache.org/viewvc/commons/proper/dbcp/tags/DBCP_1_4/src/java/org/apache/commons/dbcp/BasicDataSourceFactory.java?view=markup
>
>> I removed the db2cc4.jar to get an exception to inspect from where the driver is
loaded and got:
>>
>>   Caused by: java.lang.ClassNotFoundException: com.ibm.db2.jcc.DB2Driver
>> at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1858)
>> at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1709)
>> at org.apache.commons.dbcp.BasicDataSource.createConnectionFactory(BasicDataSource.java:1420)
>
> That only tells you where the driver is loaded. It doesn't tell you when
> the thread was launched.
>
> After shutting-down your web application (and getting the warning about
> the Timer-0 thread), can you take a thread dump and show us the stack
> trace for the Timer-0 thread?
>
> -chris
>
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