Another ThreadLocal leak

Changed Assigned User from - to @User_306070

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Seems classFromBytesRef was created to fix a crash in JVM, has been around since version 2.0 according to grepcode.It might not be needed anymore.Add this workaround in the destroy() of a ServletContextListener implementation:private void fixJasperLocalThread() { fixJasperLocalThread(FontUtil.class, "threadMissingFontsCache"); fixJasperLocalThread(JRAbstractJavaCompiler.class, "classFromBytesRef");}private void fixJasperLocalThread(Class<?> clazz, String fieldName) { try { Field field = clazz.getDeclaredField(fieldName); if (field != null) { field.setAccessible(true); Field modifiersField = Field.class.getDeclaredField("modifiers"); modifiersField.setAccessible(true); modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL); field.set(null, null); } } catch (IllegalAccessException | NoSuchFieldException | SecurityException ex) { // ignorado }}

Changed Assigned User from @User_306070 to -

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Just downloaded 6.2 of Jaspersoft server.Still see: Threads are going to be renewed over time to try and avoid a probable memory leak.in the apache-tomcat\logs\jasperreportstomcat-stderr.2015-12-10.logIs this something to be concerned about.If so what is the fix, please be succinct and correct.

Add the following line to WEB-INF/classes/jasperreports.properties to avoid this particular ThreadLocal problem:

 

net.sf.jasperreports.evaluator.class.reference.fix.enabled=false

 

Regards,

Lucian

I did that and I still get memory leaks.

If you look at my first post you will see it does assign null to the static attribute in class FontUtil.

This seems to fix half of the problem.

 

Dez 11, 2015 10:31:40 org.apache.catalina.loader.WebappClassLoader

ERROR: The web application [/] created a ThreadLocal with key of type [net.sf.jasperreports.engine.fonts.FontUtil$1] (value [net.sf.jasperreports.engine.fonts.FontUtil$1@3a5aa11a]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

Dez 11, 2015 10:31:40 org.apache.catalina.loader.WebappClassLoader

ERROR: The web application [/] created a ThreadLocal with key of type [net.sf.jasperreports.engine.fonts.FontUtil$1] (value [net.sf.jasperreports.engine.fonts.FontUtil$1@3a5aa11a]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

Dez 11, 2015 10:31:40 org.apache.catalina.loader.WebappClassLoader

ERROR: The web application [/] created a ThreadLocal with key of type [net.sf.jasperreports.engine.fonts.FontUtil$1] (value [net.sf.jasperreports.engine.fonts.FontUtil$1@3a5aa11a]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

Dez 11, 2015 10:31:40 org.apache.catalina.loader.WebappClassLoader

ERROR: The web application [/] created a ThreadLocal with key of type [net.sf.jasperreports.engine.fonts.FontUtil$1] (value [net.sf.jasperreports.engine.fonts.FontUtil$1@3a5aa11a]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

Dez 11, 2015 10:31:40 org.apache.catalina.loader.WebappClassLoader

ERROR: The web application [/] created a ThreadLocal with key of type [net.sf.jasperreports.engine.fonts.FontUtil$1] (value [net.sf.jasperreports.engine.fonts.FontUtil$1@3a5aa11a]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

Dez 11, 2015 10:31:40 org.apache.catalina.loader.WebappClassLoader

ERROR: The web application [/] created a ThreadLocal with key of type [net.sf.jasperreports.engine.fonts.FontUtil$1] (value [net.sf.jasperreports.engine.fonts.FontUtil$1@3a5aa11a]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

Dez 11, 2015 10:31:41 org.apache.catalina.startup.HostConfig

INFO: Undeploying context [/]

 

Right, net.sf.jasperreports.evaluator.class.reference.fix.enabled only addresses the specific problem that the original bug description and comment #1 talk about.

 

There are other similar problems (more ThreadLocals) for which I don't think that we have a solution at the moment. We'll have to go into the code and see if we can dispense of each ThreadLocal.

We are also facing memory leaks due to net.sf.jasperreports.engine.fill.JRVirtualizationContext.contexts storing huge object reference in tomcat threadlocal. Please let me know what we can do. Our application is a web application.