Hi Chris,
I analysed the thread dump using TDA (Thread Dump Analyser) and got the
following summary:
Overall Thread Count 69
Overall Monitor Count 33
Number of threads waiting for a monitor 0
Number of threads locking a monitor 7
Number of threads sleeping on a monitor 48
Number of deadlocks 0
Number of Monitors without locking threads 0
69% of all threads are sleeping on a monitor.
This might indicate they are waiting for some external resource (e.g.
database) which is overloaded or not available or are just waiting to get to do
something (idle threads).
The 7 Threads locking a monitor are as follows:-
Thanks again for your help.
"PostgreSQL-JDBC-SharedTimer-1" #104 daemon prio=5 os_prio=0
tid=0x00007f65bc06c800 nid=0x18f7 in Object.wait() [0x00007f65abf22000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.util.TimerThread.mainLoop(Timer.java:552)
- locked <0x00000006c18fc1d8> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:505)
"OpenEJB-TimerService-Scheduler_QuartzSchedulerThread" #62 daemon prio=5
os_prio=0 tid=0x0000000002483000 nid=0x1849 in Object.wait()
[0x00007f65ad8e9000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at
org.apache.openejb.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:311)
- locked <0x00000006c13641c0> (a java.lang.Object)
"AbstractSecurityService.Timer" #30 daemon prio=5 os_prio=0
tid=0x00007f6608b6b000 nid=0x180c in Object.wait() [0x00007f65d4b71000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.util.TimerThread.mainLoop(Timer.java:552)
- locked <0x00000006c01105a0> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:505)
"RetryTimer" #29 daemon prio=5 os_prio=0 tid=0x00007f6608b5f800 nid=0x180b in
Object.wait() [0x00007f65d4c72000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000006c0110778> (a java.util.TaskQueue)
at java.lang.Object.wait(Object.java:502)
at java.util.TimerThread.mainLoop(Timer.java:526)
- locked <0x00000006c0110778> (a java.util.TaskQueue)
at java.util.TimerThread.run(Timer.java:505)
"GC Daemon" #10 daemon prio=2 os_prio=0 tid=0x00007f6608990800 nid=0x17ec in
Object.wait() [0x00007f65d54bd000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000006c0110790> (a sun.misc.GC$LatencyLock)
at sun.misc.GC$Daemon.run(GC.java:117)
- locked <0x00000006c0110790> (a sun.misc.GC$LatencyLock)
"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007f6608108000 nid=0x17d6 in
Object.wait() [0x00007f65f05f4000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x00000006c0110f78> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)
"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007f6608103800
nid=0x17d5 in Object.wait() [0x00007f65f06f5000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x00000006c0111148> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
-----Original Message-----
From: Christopher Schultz [mailto:ch...@christopherschultz.net]
Sent: 31 July 2016 14:04
To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: Hanging threads in tomee 1.7.4
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Kuldeep,
On 7/29/16 10:18 AM, Kuldeep Sagoo wrote:
> I was really hoping you could help – I’m currently workingin
> application support and one of our key applications as started
> behavingabnormally when upgrading from Tomee version 1.68 to 1.7.4
> (Apache Tomcat(TomEE)/7.0.68 (1.7.4)) .
>
>
>
> JDK
>
> java version "1.8.0_77"
>
> Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
>
> Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixedmode)
>
>
>
> OS
>
> Red Hat Enterprise Linux Server release 6.7 (Santiago)
>
> Oracle Linux Server release 6.7
>
>
>
> The issue occurs intermittently. The Tomee processwhen its status is
> checked reports to be in ‘Running’ state. But from adatabase and
> application perspective all created orders remain in “New State”and
> remain in a Wait state to be processed.
>
>
>
> I have taken a thread dump at the point when this occurs andwas hoping
> you that someone could give me some pointers.
>
>
>
> Thanks for your help in advance and have a great weekend
>
>
>
>
>
>
>
> Thread Dump
>
Sorry, this thread dump is unreadable. Can you remove all of the threads that
are sleeping for obvious reasons and post the problematic one(s)?
- -chris
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