quartz集群报错but has failed to stop it. This is very likely to create a memory leak.
在一台配置1核2G内存的阿里云服务器上运行quartz；执行定时任务报如下异常，而在本地开发环境中则正常运行。
10-Sep-2016 11:43:50.415 WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [faxian] appears to have started a thread named [logback-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
10-Sep-2016 11:43:50.415 WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [faxian] appears to have started a thread named [Abandoned connection cleanup thread] 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.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)
10-Sep-2016 11:43:50.416 WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [faxian] appears to have started a thread named [clusterQuartzScheduler_Worker-1] 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)
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:568)
10-Sep-2016 11:43:50.417 WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [faxian] appears to have started a thread named [clusterQuartzScheduler_Worker-2] 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)根据异常，初步判断是内存溢出导致的问题。查看服务器内存使用情况
[root@test-server logs]# free -h
total used free shared buffers cached
Mem: 1.8G 1.7G 84M 9.4M 154M 520M
-/+ buffers/cache: 1.1G 759M
Swap: 0B 0B 0B
于是查看quartz的配置
<task:executor id="quartzTaskExecutor" keep-alive="900" pool-size="10" queue-capacity="20" />
pool-size="10"，queue-capacity="20"。
然而根据实际情况并，连接池数量和容量并不需要这么大。改成pool-size="1"，queue-capacity="1"，再次启动不再报错。
查看服务器内存使用情况
[root@test-server logs]# free -h
total used free shared buffers cached
Mem: 1.8G 1.7G 141M 9.3M 154M 422M
-/+ buffers/cache: 1.1G 718M
Swap: 0B 0B 0B
