martin-g commented on pull request #382:
URL: https://github.com/apache/tomcat/pull/382#issuecomment-743155616
There is some issue with stopping an embedded Tomcat:
```
=== Started
^CDec 11, 2020 11:59:45 AM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["https-openssl-apr-/tmp/tomcat-uds.sock"]
Dec 11, 2020 11:59:45 AM org.apache.catalina.core.StandardService
stopInternal
INFO: Stopping service [Tomcat]
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by
org.apache.catalina.loader.WebappClassLoaderBase
(file:/home/ubuntu/git/mg.solutions/http2-server-perf-tests/java/tomcat/target/tomcat-embedded-1.0-SNAPSHOT.jar)
to field java.io.ObjectStreamClass$Caches.localDescs
WARNING: Please consider reporting this to the maintainers of
org.apache.catalina.loader.WebappClassLoaderBase
WARNING: Use --illegal-access=warn to enable warnings of further illegal
reflective access operations
WARNING: All illegal access operations will be denied in a future release
Dec 11, 2020 11:59:45 AM org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["https-openssl-apr-/tmp/tomcat-uds.sock"]
Dec 11, 2020 11:59:55 AM org.apache.tomcat.util.net.Acceptor stop
WARNING: The acceptor thread
[https-openssl-apr-/tmp/tomcat-uds.sock-Acceptor] did not stop cleanly
=== Stopped
```
and the application hangs.
Thread dump:
```
2020-12-11 12:02:45
Full thread dump OpenJDK 64-Bit Server VM (16-ea+26-1764 mixed mode):
Threads class SMR info:
_java_thread_list=0x0000ffff806d7a50, length=14, elements={
0x0000ffff801d1390, 0x0000ffff801d2b30, 0x0000ffff801ffda0,
0x0000ffff802012e0,
0x0000ffff80202810, 0x0000ffff802042e0, 0x0000ffff802058e0,
0x0000ffff80206e70,
0x0000ffff80297670, 0x0000ffff802a23f0, 0x0000ffff80697560,
0x0000fffef8001100,
0x0000ffff806e3050, 0x0000ffff800248b0
}
"Reference Handler" #2 daemon prio=10 os_prio=0 cpu=0.42ms elapsed=413.75s
tid=0x0000ffff801d1390 nid=0x2c113f waiting on condition [0x0000ffff609fc000]
java.lang.Thread.State: RUNNABLE
at
java.lang.ref.Reference.waitForReferencePendingList(java.base@16-ea/Native
Method)
at
java.lang.ref.Reference.processPendingReferences(java.base@16-ea/Reference.java:243)
at
java.lang.ref.Reference$ReferenceHandler.run(java.base@16-ea/Reference.java:215)
"Finalizer" #3 daemon prio=8 os_prio=0 cpu=0.46ms elapsed=413.75s
tid=0x0000ffff801d2b30 nid=0x2c1140 in Object.wait() [0x0000ffff607fc000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@16-ea/Native Method)
- waiting on <0x00000007148016c8> (a
java.lang.ref.ReferenceQueue$Lock)
at
java.lang.ref.ReferenceQueue.remove(java.base@16-ea/ReferenceQueue.java:155)
- locked <0x00000007148016c8> (a java.lang.ref.ReferenceQueue$Lock)
at
java.lang.ref.ReferenceQueue.remove(java.base@16-ea/ReferenceQueue.java:176)
at
java.lang.ref.Finalizer$FinalizerThread.run(java.base@16-ea/Finalizer.java:171)
"Signal Dispatcher" #4 daemon prio=9 os_prio=0 cpu=0.53ms elapsed=413.75s
tid=0x0000ffff801ffda0 nid=0x2c1141 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Service Thread" #5 daemon prio=9 os_prio=0 cpu=0.38ms elapsed=413.75s
tid=0x0000ffff802012e0 nid=0x2c1142 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Monitor Deflation Thread" #6 daemon prio=9 os_prio=0 cpu=2.44ms
elapsed=413.75s tid=0x0000ffff80202810 nid=0x2c1143 runnable
[0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" #7 daemon prio=9 os_prio=0 cpu=439.33ms elapsed=413.75s
tid=0x0000ffff802042e0 nid=0x2c1144 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"C1 CompilerThread0" #10 daemon prio=9 os_prio=0 cpu=605.34ms
elapsed=413.75s tid=0x0000ffff802058e0 nid=0x2c1145 waiting on condition
[0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"Sweeper thread" #11 daemon prio=9 os_prio=0 cpu=0.09ms elapsed=413.75s
tid=0x0000ffff80206e70 nid=0x2c1146 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Notification Thread" #12 daemon prio=9 os_prio=0 cpu=0.10ms elapsed=413.72s
tid=0x0000ffff80297670 nid=0x2c1147 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Common-Cleaner" #13 daemon prio=8 os_prio=0 cpu=0.69ms elapsed=413.71s
tid=0x0000ffff802a23f0 nid=0x2c1149 in Object.wait() [0x0000ffff50ffc000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(java.base@16-ea/Native Method)
- waiting on <0x0000000714802c70> (a
java.lang.ref.ReferenceQueue$Lock)
at
java.lang.ref.ReferenceQueue.remove(java.base@16-ea/ReferenceQueue.java:155)
- locked <0x0000000714802c70> (a java.lang.ref.ReferenceQueue$Lock)
at
jdk.internal.ref.CleanerImpl.run(java.base@16-ea/CleanerImpl.java:140)
at java.lang.Thread.run(java.base@16-ea/Thread.java:831)
at
jdk.internal.misc.InnocuousThread.run(java.base@16-ea/InnocuousThread.java:134)
"Catalina-utility-1" #15 prio=1 os_prio=0 cpu=22.45ms elapsed=412.77s
tid=0x0000ffff80697560 nid=0x2c1151 waiting on condition [0x0000ffff127fd000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@16-ea/Native Method)
- parking to wait for <0x00000007149aaa60> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.park(java.base@16-ea/LockSupport.java:341)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@16-ea/AbstractQueuedSynchronizer.java:505)
at
java.util.concurrent.ForkJoinPool.managedBlock(java.base@16-ea/ForkJoinPool.java:3137)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@16-ea/AbstractQueuedSynchronizer.java:1614)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@16-ea/ScheduledThreadPoolExecutor.java:1177)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@16-ea/ScheduledThreadPoolExecutor.java:899)
at
java.util.concurrent.ThreadPoolExecutor.getTask(java.base@16-ea/ThreadPoolExecutor.java:1056)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@16-ea/ThreadPoolExecutor.java:1116)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@16-ea/ThreadPoolExecutor.java:630)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@16-ea/Thread.java:831)
"Catalina-utility-2" #16 prio=1 os_prio=0 cpu=22.19ms elapsed=412.77s
tid=0x0000fffef8001100 nid=0x2c1152 waiting on condition [0x0000ffff125fd000]
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@16-ea/Native Method)
- parking to wait for <0x00000007149aaa60> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.park(java.base@16-ea/LockSupport.java:341)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@16-ea/AbstractQueuedSynchronizer.java:505)
at
java.util.concurrent.ForkJoinPool.managedBlock(java.base@16-ea/ForkJoinPool.java:3137)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@16-ea/AbstractQueuedSynchronizer.java:1614)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@16-ea/ScheduledThreadPoolExecutor.java:1170)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(java.base@16-ea/ScheduledThreadPoolExecutor.java:899)
at
java.util.concurrent.ThreadPoolExecutor.getTask(java.base@16-ea/ThreadPoolExecutor.java:1056)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@16-ea/ThreadPoolExecutor.java:1116)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@16-ea/ThreadPoolExecutor.java:630)
at
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(java.base@16-ea/Thread.java:831)
"https-openssl-apr-/tmp/tomcat-uds.sock-Acceptor" #28 daemon prio=5
os_prio=0 cpu=0.24ms elapsed=412.76s tid=0x0000ffff806e3050 nid=0x2c115e
runnable [0x0000ffff10dfe000]
java.lang.Thread.State: RUNNABLE
at org.apache.tomcat.jni.Socket.accept(Native Method)
at
org.apache.tomcat.util.net.AprEndpoint.serverSocketAccept(AprEndpoint.java:729)
at
org.apache.tomcat.util.net.AprEndpoint.serverSocketAccept(AprEndpoint.java:82)
at org.apache.tomcat.util.net.Acceptor.run(Acceptor.java:106)
at java.lang.Thread.run(java.base@16-ea/Thread.java:831)
"DestroyJavaVM" #30 prio=5 os_prio=0 cpu=1003.31ms elapsed=169.91s
tid=0x0000ffff800248b0 nid=0x2c1138 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"VM Thread" os_prio=0 cpu=8.42ms elapsed=413.76s tid=0x0000ffff801c2f70
nid=0x2c113e runnable
"GC Thread#0" os_prio=0 cpu=5.94ms elapsed=413.78s tid=0x0000ffff80073930
nid=0x2c1139 runnable
"GC Thread#1" os_prio=0 cpu=4.91ms elapsed=412.94s tid=0x0000ffff48004f60
nid=0x2c114c runnable
"GC Thread#2" os_prio=0 cpu=4.92ms elapsed=412.94s tid=0x0000ffff48005af0
nid=0x2c114d runnable
"GC Thread#3" os_prio=0 cpu=4.90ms elapsed=412.94s tid=0x0000ffff48006680
nid=0x2c114e runnable
"GC Thread#4" os_prio=0 cpu=4.87ms elapsed=412.94s tid=0x0000ffff48007210
nid=0x2c114f runnable
"GC Thread#5" os_prio=0 cpu=4.88ms elapsed=412.94s tid=0x0000ffff48007da0
nid=0x2c1150 runnable
"G1 Main Marker" os_prio=0 cpu=0.11ms elapsed=413.78s tid=0x0000ffff800848c0
nid=0x2c113a runnable
"G1 Conc#0" os_prio=0 cpu=0.06ms elapsed=413.78s tid=0x0000ffff80085950
nid=0x2c113b runnable
"G1 Refine#0" os_prio=0 cpu=0.08ms elapsed=413.78s tid=0x0000ffff8013ac50
nid=0x2c113c runnable
"G1 Service" os_prio=0 cpu=15.07ms elapsed=413.78s tid=0x0000ffff8013bc70
nid=0x2c113d runnable
"VM Periodic Task Thread" os_prio=0 cpu=45.58ms elapsed=413.72s
tid=0x0000ffff80299160 nid=0x2c1148 waiting on condition
JNI global refs: 27, weak refs: 0
Heap
garbage-first heap total 256000K, used 17190K [0x0000000706600000,
0x0000000800000000)
region size 2048K, 9 young (18432K), 2 survivors (4096K)
Metaspace used 19940K, committed 20160K, reserved 1073152K
class space used 1918K, committed 2048K, reserved 1048576K
```
The application I use to test it could be found at
https://github.com/martin-g/http2-server-perf-tests/blob/feature/jakartaee-9/java/tomcat/src/main/java/info/mgsolutions/tomcat/TomcatEmbedded.java
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