| Title | tomcat thread dump tomcat thread dump | ||||||
| Writer | 이지섭 | Write Date | Apr 29 2018 | Modify Date | Aug 9 2024 | View Count | 3385 |
This is guide to dump Tomcat thread.
Basically, under the Tomcat home, under the webapps, there must be manager directory. This directory is provided basically by Tomcat.
The object is http://localhost/manager/text/threaddump Like above, in web browser view the thread dump.
1) Process 1. Modify the below xml file. TOMCAT_HOME/webapps/manager/META-INF/context.xml
<context privileged="true" antiresourcelocking="false">
<valve allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" classname="org.apache.catalina.valves.RemoteAddrValve">
<manager sessionattributevalueclassnamefilter="java\.lang\.(?:Boolean|Integer|Long|Number|String)|org\.apache\.catalina\.filters\.CsrfPreventionFilter\$LruCache(?:\$1)?|java\.util\.(?:Linked)?HashMap">
</manager>
→ <context privileged="true" antiresourcelocking="false">
<valve allow="^.*$" classname="org.apache.catalina.valves.RemoteAddrValve">
<manager sessionattributevalueclassnamefilter="java\.lang\.(?:Boolean|Integer|Long|Number|String)|org\.apache\.catalina\.filters\.CsrfPreventionFilter\$LruCache(?:\$1)?|java\.util\.(?:Linked)?HashMap">
</manager>
This make all IPs accessible to dump thread. Before this only 127.0.0.1, localhost has access to dump thread.
2) Process 2. Modify below xml file. TOMCAT_HOME/conf/tomcat-users.xml
Add below two line to the tomcat-users tag in this xml file. <role rolename="manager-script"/> <user username="tomcat10" password="password Input" roles="manager-script"/>
http://localhost/manager/text/threaddump The dump program runs as manager-script provileges. So add the role and user.
Repeatedly,
TOMCAT_HOME/webapps/manager/META-INF/context.xml : configure accessible IPs TOMCAT_HOME/conf/tomcat-users.xml : configure previleges After above two configuration,
http://localhost/manager/text/threaddump 또는 http://localhost:8080/manager/text/threaddump By call a URL like above we can view Tomcat thread dump.
To view the content we must input ID and Password,
this is in the tomcat-users.xml file, above 2).
The dump content like below. OK - JVM thread dump 2018-04-29 18:02:06.791 Full thread dump Java HotSpot(TM) 64-Bit Server VM (9.0.1+11 mixed mode): "Abandoned connection cleanup thread" Id=45 cpu=603854 ns usr=0 ns blocked 1 for -1 ms waited 3 for -1 ms java.lang.Thread.State: TIMED_WAITING locks java.util.concurrent.ThreadPoolExecutor$Worker@ddd6377 at java.base@9.0.1/java.lang.Object.wait(Native Method) - waiting on (a java.lang.ref.ReferenceQueue$Lock@4fa28c62) at java.base@9.0.1/java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151) at com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:64) at java.base@9.0.1/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) at java.base@9.0.1/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) at java.base@9.0.1/java.lang.Thread.run(Thread.java:844) "ajp-nio-8009-AsyncTimeout" Id=43 cpu=264727 ns usr=0 ns blocked 0 for -1 ms waited 8 for -1 ms java.lang.Thread.State: TIMED_WAITING at java.base@9.0.1/java.lang.Thread.sleep(Native Method) at org.apache.coyote.AbstractProtocol$AsyncTimeout.run(AbstractProtocol.java:1133) at java.base@9.0.1/java.lang.Thread.run(Thread.java:844) "ajp-nio-8009-Acceptor-0" Id=42 cpu=4483464 ns usr=0 ns blocked 0 for -1 ms waited 0 for -1 ms (running in native) java.lang.Thread.State: RUNNABLE at java.base@9.0.1/sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method) at java.base@9.0.1/sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:424) at java.base@9.0.1/sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:252) - locked (a java.lang.Object@7346f5be) index 2 frame java.base@9.0.1/sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:252) at org.apache.tomcat.util.net.NioEndpoint$Acceptor.run(NioEndpoint.java:455) at java.base@9.0.1/java.lang.Thread.run(Thread.java:844) ... ... ... | |||||||