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To prevent a memory leak, the JDBC Driver has been forcibly unregistered
(14 answers)
Closed 8 years ago.
when i starting tomcat server
I got this error
INFO: Server startup in 1751 ms
20 mai 2014 10:42:47 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
GRAVE: The web application [/servlet] registered the JDBC driver [org.postgresql.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
20 mai 2014 10:42:47 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
GRAVE: The web application [/servlet] appears to have started a thread named [Thread-4] but has failed to stop it. This is very likely to create a memory leak.
20 mai 2014 10:42:47 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
GRAVE: The web application [/servlet] appears to have started a thread named [CronTriggers_Worker-1] but has failed to stop it. This is very likely to create a memory leak.
20 mai 2014 10:42:47 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
GRAVE: The web application [/servlet] appears to have started a thread named [CronTriggers_Worker-2] but has failed to stop it. This is very likely to create a memory leak.
can you help me please
Check whether you have created any static connection objects. Static object tend to live in the server heap even when the application is stopped.
Related
I am using org.asynchttpclient to post async request.
While shutting down tomcat, I am getting below logs:
SEVERE: The web application [/test] appears to have started a thread named [pool-1-thread-1] but has failed to stop it. This is very likely to create a memory leak.
Jul 04, 2017 10:53:00 AM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
SEVERE: The web application [/test] appears to have started a thread named [AsyncHttpClient-2-1] but has failed to stop it. This is very likely to create a memory leak.
Jul 04, 2017 10:53:00 AM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
SEVERE: The web application [/test] appears to have started a thread named [AsyncHttpClient-2-2] but has failed to stop it. This is very likely to create a memory leak.
Jul 04, 2017 10:53:00 AM org.apache.catalina.loader.WebappClassLoaderBase checkThreadLocalMapForLeaks
SEVERE: The web application [/test] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal#71513074]) and a value of type [io.netty.util.internal.InternalThreadLocalMap] (value [io.netty.util.internal.InternalThreadLocalMap#4aecc2e8]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
How to close these threads to prevent memory leak.
This is really more of a warning and in most times can be ignored. You will see this error when the context is reloaded or shut down. If you are shutting down the server then the JVM will be shutdown also and the os will clean up any memory.
If you want to try and call close on the AsyncHttpClient which implements Closable it may stop this issue. You will probably have to put a wait in there to let it fully close the connection factory. You can look at the tomcat Lifecycle to add a shutdown handler to handle closing the client.
I'm using Spring 4.0, tomcat 8, spring-data-jpa 1.7.0.RELEASE, hibernate 4.1, mysql 5.6.21 Homebrew. I'm new in java, just moved form C++ background. I assume there must be some resource leaking. I have to close or free something before I exist the app. But no idea what to do. Please advise me!
Every time I restart I got following error:-
Nov 20, 2014 2:01:01 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
WARNING: The web application [MyJap] appears to have started a thread named [MySQL
Statement Cancellation Timer] but has failed to stop it. This is very likely to create a
memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:502)
java.util.TimerThread.mainLoop(Timer.java:526)
java.util.TimerThread.run(Timer.java:505)
Nov 20, 2014 2:01:01 PM org.apache.coyote.AbstractProtocol start
I am getting this message when I run my web application with Quartz 2.x . It runs fine but I get this error during stating server
INFO: Server startup in 1792 ms
20 mai 2014 18:18:59 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
GRAVE: The web application [/servlet] appears to have started a thread named [Thread-4] but has failed to stop it. This is very likely to create a memory leak.
20 mai 2014 18:18:59 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
GRAVE: The web application [/servlet] appears to have started a thread named [CronTriggers_Worker-1] but has failed to stop it. This is very likely to create a memory leak.
20 mai 2014 18:18:59 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
GRAVE: The web application [/servlet] appears to have started a thread named [CronTriggers_Worker-2] but has failed to stop it. This is very likely to create a memory leak.
Any help appreciated.
This may be caused by not shutting down the Quartz scheduler upon Tomcat shutdown or web-application redeploy (most likely your case).
You will need to implement a ServletContextListener and in its contextDestroyed method you will need to do this:
scheduler.shutdown( true ); // true = wait for jobs to complete
// you may want to give Quartz some extra time to shutdown
//Thread.sleep(1000);
You may also want to configure the Quartz thread-pool to mark its threads as "daemon threads" (org.quartz.threadPool.makeThreadsDaemons=true) as they will not block the JVM from stopping. Otherwise, the JVM will wait for all these worker threads to finish.
I seem to be having the same problem that everyone has with Struts2 and getting it up and running, driving me mad :#
Having manually written the files from the Hello_World_Struts2_Ant project and run into build path issues, I decided I should just download the project to see it up and running.....
For some reason the only page I can access from this project is index.jsp, when i try to click on the link for hello.action or visit hello.action through the address bar, it gives me a tomcat 404. (I am running tomcat 7).
I would usually concede that it is my own idiocy that has led me here, but the fact that the project download from the struts site isn't working is just plain annoying.....
I'm not great with tomcat error logs, but I can't see anything that can help me with this issue.
Any help would be greatly appreciated.
To save me loading this page with all code that I have, I've got the code that is distributed here: http://code.google.com/p/struts2-examples/downloads/detail?name=Hello_World_Struts_2_Ant_2_3_1_2.zip&can=2&q=
Catalina Log
=====================================
INFO: Server startup in 3099 ms
08-Aug-2012 22:28:39 org.apache.jasper.compiler.TldLocationsCache tldScanJar
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them.
Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
08-Aug-2012 22:28:46 org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-bio-8080"]
08-Aug-2012 22:28:46 org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ajp-bio-8009"]
08-Aug-2012 22:28:46 org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
08-Aug-2012 22:28:46 org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/Hello_World_Struts2_Ant] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#39bde3d2]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#61b80d9b]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
08-Aug-2012 22:28:46 org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/Hello_World_Struts2_Ant] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#39bde3d2]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#7a856d3b]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
08-Aug-2012 22:28:46 org.apache.coyote.AbstractProtocol stop
stderr Log (INFOS Removed)
================================
08-Aug-2012 22:28:46 org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/Hello_World_Struts2_Ant] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#39bde3d2]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#61b80d9b]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
08-Aug-2012 22:28:46 org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/Hello_World_Struts2_Ant] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#39bde3d2]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#7a856d3b]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
08-Aug-2012 22:28:46 org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["http-bio-8080"]
08-Aug-2012 22:28:46 org.apache.coyote.AbstractProtocol stop
INFO: Stopping ProtocolHandler ["ajp-bio-8009"]
After a reading the above posts I deleted my Tomcat installation and started again from scratch that way, it seemed that Tomcat had been the problem as it worked straight away for me after reinstalling tomcat.
It had perhaps been me deploying things as root.war that caused the tomcat issue.
The "same problem" thing was that I had done a bit of search before posting this and found a lot of folk having issues with getting struts up and running, perhaps a poor phrase to describe the issue on my part.
Thanks for the help though! Defainately going to look into Maven as a lot of folk seem to recommend it, although the copying to WEB-INF/lib and configuring build path works for now :)
SEVERE: The web application [/ppAdmin] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#126212dd]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#64c47498]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Mar 22, 2012 12:43:00 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/ppAdmin] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#1dc2dad7]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#63ad6884]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Mar 22, 2012 12:43:00 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/ppAdmin] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#1dc2dad7]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#da8e53c]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Mar 22, 2012 12:43:01 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/Nemo] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Mar 22, 2012 12:43:01 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/Nemo] registered the JDBC driver [net.sourceforge.jtds.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Mar 22, 2012 12:43:01 PM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/Nemo] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
Mar 22, 2012 12:43:01 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/Nemo] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#28318d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#4ecd200f]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Mar 22, 2012 12:43:01 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/Nemo] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#7cf3e133]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#6f461b5b]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Mar 22, 2012 12:43:01 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/Nemo] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#28318d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#63ae2c6f]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Mar 22, 2012 12:43:01 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/Nemo] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#28318d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#3fe75e89]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Mar 22, 2012 12:43:01 PM org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
SEVERE: The web application [/Nemo] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10#28318d]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;#6eef9525]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
Mar 22, 2012 12:43:01 PM org.apache.coyote.http11.Http11Protocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8080
WHY THE MEMORY LEAK WARNINGS ARE THERE???TOMCAT 6.0.35 ALLOWS GC TOOL.STILL IT GIVES SUCH WARNINGS.I AM BOTHERED ABOUT THESE WARNINGS.PLEASE HELP ME HOW TO MANAGE WITH THESE?
ANY HELP WILL BE HIGHLY APPRECIATED..................THANKS IN ADVANCE.
I had the same problem with Tomcat 6 and Struts2 2.1.8 webapp (maven 3.0.3 + eclipse keepler + JDK 1.6.0_22). I'm new in struts2+tomcat developing and I'm not used to solve this kind of problems.
After having made some changes on my code (and don't use svn nor git...), and after start using a mvn tomcat:redeploy task (witch confused me) I had this same behavior, and don't know what were causing to fail the deployment (the project keeps compiling ok).
The error seems so confusing and zero descriptive to me, and I've read many related posts. I've tryed to update the struts2 version, cause I've read that this kind of problems seems solved in struts2 2.3.3 (was using 2.1.8).
https://issues.apache.org/jira/browse/WW-3768
I dont't know why I was just reading catalina log:
SEVERE: Error filterStart
12/02/2014 10:46:23 org.apache.catalina.core.StandardContext start
SEVERE: Context [/validador] startup failed due to previous errors
The answer was very close, in localhost-date.log!
That point me to a bad declared action in struts.xml, so simple to solve and so descriptive, but so dificult to figure out just reading catalina log.
SEVERE: Exception starting filter struts2
Unable to load configuration. - action - file:/C:/apps/apache-tomcat- 6.0.39/webapps/validador/WEB-INF/classes/struts.xml:74:83
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:501)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57)
...
...
Caused by: Action class [aoc.action.signature.CompletePDFUpload] not found - action - file:/C:/apps/apache-tomcat-6.0.39/webapps/validador/WEB-INF/classes/struts.xml:74:83
I hope someone else missed to check the correct log and solve as easy as me their problem.