On 05/03/2010 12:48 PM, Pid wrote:
> On 03/05/2010 17:15, Mark Shifman wrote:
>> I have a web app running under tomcat-6.0.26 with
>> JreMemoryLeakPreventionListener, java jdk1.6.0_18.
>>
>> Using jmap -histo pid, I can watch
>> com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl, etc increase in number
>> after running my unmarshal action, followed by undeploy and redeploy. Find
>> Leaks in the manager also finds leaks.
>
> After a few undeploy/redeploy cycles does the number of
> WebappClassLoader's also increase?
Yes it increases 1 for each undeploy/redeploy cycle.
>
>> The JAXBContext instance is created with a singleton that is an enum (using
>> Josh Block's pattern):
>>
>> public enum JAXBContextMascot {
>> INSTANCE("com.matrixscience.xmlns.schema.mascot_search_results_2" );
>> private JAXBContext ctx;
>> JAXBContextMascot(String contextPath) {
>> try {
>> ctx =JAXBContext.newInstance(clazz);
>
> Where does the 'clazz' variable come from?
My bad I edited the email argg. should of course be contextPath.
>
>> } catch (JAXBException e) {
>> throw new RuntimeException(e);
>> }
>> }
>> public Unmarshaller createUnmarshaller(){
>> try {
>> return ctx.createUnmarshaller();
>> } catch (JAXBException e) {
>> throw new RuntimeException(e);
>> }
>> }
>> }
>>
>> Am I doing something wrong which is causing the memory leak?
>
> Maybe.
>
>> JAXBContext.newInstance() can take a ClassLoader argument. Is there some
>> ClassLoader I should be using that will get around this?
>
> Where is the jar with the above code, in a webapp?
The code above in in the war for the web app in a class in
WEB-INF/classes/org/blablabla
It is called via a class that looks like this:
public class JAXBMascot {
protected static Log log = LogFactory.getLog(JAXBMascot.class);
private XMLEventReader reader;
private Unmarshaller u =
JAXBContextMascot.INSTANCE.createUnmarshaller();
private InputStream jxb_in;
public static JAXBMascot getInstance(InputStream in) {
JAXBMascot m = new JAXBMascot();
try {
m.setJxb_in(in);
m.setReader(XMLInputFactory.newInstance().createXMLEventReader(in));
} catch (Exception e) {
log.fatal("error getting JAXBMascot instance");
IOUtils.closeQuietly(in);
throw new RuntimeException(e);
}
return m;
}
....
}
This is also in the webapp in WEB-INF/classes/org/blablabla
thanks
mas
>
>
> p
>
>> Any help would be appreciated.
>> mas
>>
>>
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