spring quartz 启动报错This is very likely to create a memory leak. Stack trace of thread:

今天在linux系统下启动一个带有spring quartz 定时任务的项目，发现启动完之后不能正常跑定时任务。在windows环境下运行正常。
catalina.out输出信息大概是这样的：

26-Dec-2018 10:38:24.697 WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [test-job] appears to have started a thread named [scheduler_Worker-9] 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$WorkerThread.run(SimpleThreadPool.java:568)
26-Dec-2018 10:38:24.698 WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [test-job] appears to have started a thread named [scheduler_Worker-10] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.lang.Object.wait(Native Method)
 org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:568)
2018-12-26 10:38:24.793 [scheduler_Worker-2] DEBUG 
......
[org.quartz.simpl.SimpleThreadPool.run(612)] WorkerThread is shut down.

咋一看以为是内存溢出，查了一下jvm内存配置和系统空闲内存，发现jvm配置了2g，空闲内存也有几个g容量。
于是继续查看日志，发现quartz的Scheduler已经正常启动，上述错误是应用出错停止后报出来的。再看看localhost.2018-12-26.log文件。发现报以下错误：

java.lang.NoSuchMethodError: com.mchange.v2.async.ThreadPoolAsynchronousRunner.<init>(IZLjava/util/Timer;Ljava/lang/String;)V
        at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPoolManager.createTaskRunner(C3P0PooledConnectionPoolManager.java:132)
        at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPoolManager.poolsInit(C3P0PooledConnectionPoolManager.java:143)
        at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPoolManager.<init>(C3P0PooledConnectionPoolManager.java:262)
        at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getPoolManager(AbstractPoolBackedDataSource.java:508)
        at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
        at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
        at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
        at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:81)
        at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:67)
        at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:279)
        at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:69)
        at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:56)
        at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
        at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:141)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:101)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:95)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
        at com.sun.proxy.$Proxy10.selectList(Unknown Source)
        at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:198)

这明显是c3p0数据源出了问题。仔细分析了一下maven依赖终于找到原因。

问题的原因：
jar包冲突。
我使用的是quartz-2.2.3.jar包，依赖导入了c3p0-0.9.1.1.jar，但是我在导入quartz之前已经引入了c3p0-0.9.2-pre5.jar。导致两个包冲突。将其中一个去掉解决问题。

解决方法：
引入quartz包的时候，排除c3p0.

		<dependency>
			<groupId>org.quartz-scheduler</groupId>
			<artifactId>quartz</artifactId>
			<version>2.2.3</version>
			<exclusions>
				<exclusion>
					<artifactId>c3p0</artifactId>
					<groupId>c3p0</groupId>
				</exclusion>
			</exclusions>
		</dependency>