[Freemarker-devel] Object lock in freemarker

[sreenath579]

Hi,

We have a system developed in Struts2 and deployed in Weblogic 10.3.6. But
there is an object lock is appearing while analyzing the thread dump . i am
using freemarker-2.3.13.jar.

"[ACTIVE] ExecuteThread: '276' for queue: 'weblogic.kernel.Default
(self-tuning)'" daemon prio=10 tid=0x00002b8c54e76800 nid=0x3e18 waiting for
monitor entry [0x00002b8c8ca06000]
java.lang.Thread.State: BLOCKED (on object monitor)
at freemarker.ext.beans.BeansModelCache.create(BeansModelCache.java:31)
- waiting to lock <0x00000005243d7bf0> (a java.util.HashMap)
at freemarker.ext.util.ModelCache.getInstance(ModelCache.java:115)
at freemarker.ext.beans.BeansWrapper.wrap(BeansWrapper.java:468)
at
freemarker.template.WrappingTemplateModel.wrap(WrappingTemplateModel.java:134)
at
org.apache.struts2.views.freemarker.ScopesHashModel.get(ScopesHashModel.java:94)
at freemarker.core.Environment.getGlobalVariable(Environment.java:1088)
at freemarker.core.Environment.getVariable(Environment.java:1074)
at freemarker.core.Identifier._getAsTemplateModel(Identifier.java:70)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Dot._getAsTemplateModel(Dot.java:74)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.BuiltIn$defaultBI._getAsTemplateModel(BuiltIn.java:907)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:86)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Expression.getStringValue(Expression.java:93)






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[Attila Szegedi]

Does your dump show another thread holding the lock?

Also, note this list is retired (I’m surprised I still get mail from it, especially since I no longer am active in the project
) See <http://freemarker.org/mailing-lists.html <http://freemarker.org/mailing-lists.html>> for the current lists, or any of the other options in the “Community” sidebar on the website.

Attila.

Post by sreenath579
Hi,
We have a system developed in Struts2 and deployed in Weblogic 10.3.6. But
there is an object lock is appearing while analyzing the thread dump . i am
using freemarker-2.3.13.jar.
"[ACTIVE] ExecuteThread: '276' for queue: 'weblogic.kernel.Default
(self-tuning)'" daemon prio=10 tid=0x00002b8c54e76800 nid=0x3e18 waiting for
monitor entry [0x00002b8c8ca06000]
java.lang.Thread.State: BLOCKED (on object monitor)
at freemarker.ext.beans.BeansModelCache.create(BeansModelCache.java:31)
- waiting to lock <0x00000005243d7bf0> (a java.util.HashMap)
at freemarker.ext.util.ModelCache.getInstance(ModelCache.java:115)
at freemarker.ext.beans.BeansWrapper.wrap(BeansWrapper.java:468)
at
freemarker.template.WrappingTemplateModel.wrap(WrappingTemplateModel.java:134)
at
org.apache.struts2.views.freemarker.ScopesHashModel.get(ScopesHashModel.java:94)
at freemarker.core.Environment.getGlobalVariable(Environment.java:1088)
at freemarker.core.Environment.getVariable(Environment.java:1074)
at freemarker.core.Identifier._getAsTemplateModel(Identifier.java:70)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Dot._getAsTemplateModel(Dot.java:74)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.BuiltIn$defaultBI._getAsTemplateModel(BuiltIn.java:907)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:86)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Expression.getStringValue(Expression.java:93)
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[Daniel Dekany]

Especially since this list is retired, see my comment on SO:
http://stackoverflow.com/questions/38691722/object-block-in-freemaker

If you can reproduce this deadlock reliably, upgrade to the latest
stable release (2.3.25-incubating ATM), and see if it goes away.
(Indeed, you should upgrade no mater what... 2.3.13 is from 2008.)
--
Thanks,
Daniel Dekany

Post by sreenath579
Hi,
We have a system developed in Struts2 and deployed in Weblogic 10.3.6. But
there is an object lock is appearing while analyzing the thread dump . i am
using freemarker-2.3.13.jar.
"[ACTIVE] ExecuteThread: '276' for queue: 'weblogic.kernel.Default
(self-tuning)'" daemon prio=10 tid=0x00002b8c54e76800 nid=0x3e18 waiting for
monitor entry [0x00002b8c8ca06000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
freemarker.ext.beans.BeansModelCache.create(BeansModelCache.java:31)
- waiting to lock <0x00000005243d7bf0> (a java.util.HashMap)
at freemarker.ext.util.ModelCache.getInstance(ModelCache.java:115)
at freemarker.ext.beans.BeansWrapper.wrap(BeansWrapper.java:468)
at
freemarker.template.WrappingTemplateModel.wrap(WrappingTemplateModel.java:134)
at
org.apache.struts2.views.freemarker.ScopesHashModel.get(ScopesHashModel.java:94)
at
freemarker.core.Environment.getGlobalVariable(Environment.java:1088)
at freemarker.core.Environment.getVariable(Environment.java:1074)
at freemarker.core.Identifier._getAsTemplateModel(Identifier.java:70)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Dot._getAsTemplateModel(Dot.java:74)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at
freemarker.core.BuiltIn$defaultBI._getAsTemplateModel(BuiltIn.java:907)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:86)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Expression.getStringValue(Expression.java:93)
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