I'm having some visible performance issue related to the use of method
synchronized loadClass(String name, boolean resolve) in WebappClassLoader
I see that the author or least some of the author(s) of the class got the idea
in other cases of a more specialize lock that against the entire instance.
Should we just lock here using the name of the class we are looking for?
My partial threads stack dump:
2014-05-14 12:36:01
Full thread dump Java HotSpot(TM) 64-Bit Server VM (20.45-b01 mixed mode):
"http-bio-31680-exec-57" - Thread t@124
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
...
"http-bio-31680-exec-56" - Thread t@123
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
"http-bio-31680-exec-55" - Thread t@122
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
Locked ownable synchronizers:
- locked <444b3957> (a
java.util.concurrent.locks.ReentrantLock$NonfairSync)
"http-bio-31680-exec-54" - Thread t@121
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.findProviderClass(ObjectFactory.java:358)
"http-bio-31680-exec-53" - Thread t@120
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
"http-bio-31680-exec-52" - Thread t@119
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
"http-bio-31680-exec-51" - Thread t@118
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:119)
"http-bio-31680-exec-50" - Thread t@117
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
"http-bio-31680-exec-49" - Thread t@116
java.lang.Thread.State: RUNNABLE
at java.lang.Class.getClassLoader0(Native Method)
at java.lang.Class.getClassLoader(Class.java:589)
at
com.sun.xml.internal.bind.v2.model.annotation.LocatableAnnotation.create(LocatableAnnotation.java:63)
at
com.sun.xml.internal.bind.v2.model.annotation.RuntimeInlineAnnotationReader.getAllFieldAnnotations(RuntimeInlineAnnotationReader.java:60)
at
com.sun.xml.internal.bind.v2.model.annotation.RuntimeInlineAnnotationReader.getAllFieldAnnotations(RuntimeInlineAnnotationReader.java:42)
"http-bio-31680-exec-48" - Thread t@115
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at javax.xml.bind.ContextFinder.safeLoadClass(ContextFinder.java:481)
"http-bio-31680-exec-47" - Thread t@114
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:119)
"http-bio-31680-exec-46" - Thread t@113
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
"http-bio-31680-exec-45" - Thread t@112
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:47)
"http-bio-31680-exec-44" - Thread t@111
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.findProviderClass(ObjectFactory.java:358)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.newInstance(ObjectFactory.java:303)
"http-bio-31680-exec-43" - Thread t@110
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.findProviderClass(ObjectFactory.java:358)
"http-bio-31680-exec-42" - Thread t@109
java.lang.Thread.State: TIMED_WAITING
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <2aa68578> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:196)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
at
java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:424)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:86)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:32)
at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:955)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:917)
at java.lang.Thread.run(Thread.java:662)
Locked ownable synchronizers:
- None
"http-bio-31680-exec-40" - Thread t@107
java.lang.Thread.State: TIMED_WAITING
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <2aa68578> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:196)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
at
java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:424)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:86)
at org.apache.tomcat.util.threads.TaskQueue.poll(TaskQueue.java:32)
at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:955)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:917)
at java.lang.Thread.run(Thread.java:662)
Locked ownable synchronizers:
- None
"http-bio-31680-exec-39" - Thread t@106
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.findProviderClass(ObjectFactory.java:358)
"http-bio-31680-exec-38" - Thread t@105
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:119)
at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:154)
at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:241)
"http-bio-31680-exec-37" - Thread t@104
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:47)
at
com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.loadObjectFactory(ModelBuilder.java:249)
"http-bio-31680-exec-36" - Thread t@103
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.findProviderClass(ObjectFactory.java:358)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.newInstance(ObjectFactory.java:303)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.newInstance(ObjectFactory.java:289)
"http-bio-31680-exec-35" - Thread t@102
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
"http-bio-31680-exec-34" - Thread t@101
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
"http-bio-31680-exec-33" - Thread t@100
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
"http-bio-31680-exec-32" - Thread t@99
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.findProviderClass(ObjectFactory.java:358)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.newInstance(ObjectFactory.java:303)
"http-bio-31680-exec-31" - Thread t@98
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:119)
at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:154)
"http-bio-31680-exec-30" - Thread t@97
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at javax.xml.bind.ContextFinder.safeLoadClass(ContextFinder.java:481)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:185)
"http-bio-31680-exec-29" - Thread t@96
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
"http-bio-31680-exec-28" - Thread t@95
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:119)
at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:154)
"http-bio-31680-exec-27" - Thread t@94
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
javax.xml.parsers.FactoryFinder.getProviderClass(FactoryFinder.java:119)
"http-bio-31680-exec-26" - Thread t@93
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:505)
at
com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator.findClass(ReflectionNavigator.java:47)
"http-bio-31680-exec-25" - Thread t@92
java.lang.Thread.State: BLOCKED
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1605)
- waiting to lock <264d40df> (a
org.apache.catalina.loader.WebappClassLoader) owned by "http-bio-31680-exec-41"
t@108
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.findProviderClass(ObjectFactory.java:358)
at
com.sun.org.apache.xerces.internal.utils.ObjectFactory.newInstance(ObjectFactory.java:303)
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