Java 休眠中的c3p0死锁

我不熟悉hibernate，并且已经开始使用C3P0作为hibernate的连接池管理器，因为如果没有C3P0，我在与MySQL服务器8个小时没有联系后就会出现超时问题

在切换到C3P0之后，我最近遇到了一个死锁，我不知道它是如何发生的。我有所有的堆栈跟踪和配置要显示

这是配置日志

Jan 27, 2017 5:56:23 PM com.mchange.v2.log.MLog <clinit>
INFO: MLog clients using java 1.4+ standard logging.
Jan 27, 2017 5:56:23 PM com.mchange.v2.c3p0.C3P0Registry banner
INFO: Initializing c3p0-0.9.2.1 [built 20-March-2013 10:47:27 +0000; debug? true; trace: 10]
Jan 27, 2017 5:56:23 PM com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager
INFO: Initializing c3p0 pool... com.mchange.v2.c3p0.PoolBackedDataSource@28c81cce [ connectionPoolDataSource -> com.mchange.v2.c3p0.WrapperConnectionPoolDataSource@35af8b6c [ acquireIncrement -> 1, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, debugUnreturnedConnectionStackTraces -> false, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 1hge14z9l1qg67m9nxywg8|c2db68f, idleConnectionTestPeriod -> 300, initialPoolSize -> 1, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 120, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 25, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 1, nestedDataSource -> com.mchange.v2.c3p0.DriverManagerDataSource@2e47880e [ description -> null, driverClass -> null, factoryClassLocation -> null, identityToken -> 1hge14z9l1qg67m9nxywg8|1b765a2c, jdbcUrl -> jdbc:mysql://localhost/Pokemon_Blaze_Online_Dev, properties -> {user=******, password=******} ], preferredTestQuery -> select 1;, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, usesTraditionalReflectiveProxies -> false; userOverrides: {} ], dataSourceName -> null, factoryClassLocation -> null, identityToken -> 1hge14z9l1qg67m9nxywg8|7e276594, numHelperThreads -> 3 ]

2017年1月27日下午5:56:23 com.mchange.v2.log.MLog
信息：使用Java1.4+标准日志记录的MLog客户端。
2017年1月27日下午5:56:23 com.mchange.v2.c3p0.c3p0注册横幅
信息：初始化c3p0-0.9.2.1[构建于2013年3月20日10:47:27+0000；调试？正确；跟踪：10]
2017年1月27日下午5:56:23 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager
信息：正在初始化c3p0池。。。com.mchange.v2.c3p0。PoolBackedDataSource@28c81cce[connectionPoolDataSource->com.mchange.v2.c3p0。WrapperConnectionPoolDataSource@35af8b6c [acquireIncrement->1，AcquireEntryAttributes->30，AcquireEntryDisplay->1000，自动提交关闭->false，自动测试表->null，breakAfterAcquireFailure->false，签出超时->0，connectionCustomizerClassName->null，ConnectionTestClassName->com.mchange.v2.c3p0.impl.DefaultConnectionTester，DebuggeunReturnedConnectionsTackTraces->false，factoryClassLocation->null，ForceIgnoreUnsolvedTransactions->false，identityToken->1hge14z9l1qg67m9nxywg8 | c2db68f，idleConnectionTestPeriod->300，initialPoolSize->1，maxAdministrativeTaskTime->0，maxConnectionAge->0，maxIdleTimeExcessConnections->->0，maxPoolSize->25，maxStatements->0，maxStatementsPerConnection->0，minPoolSize->1，nestedDataSource->com.mchange.v2.c3p0。DriverManagerDataSource@2e47880e[description->null，driverClass->null，factoryClassLocation->null，identityToken->1hge14z9l1qg67m9nxywg8 | 1b765a2c，jdbcUrl->jdbc:mysql://localhost/Pokemon_Blaze_Online_Dev，属性->{user=*******，password=******}]，preferredTestQuery->select 1；，propertyCycle->0，语句CacheNumDeferredCloseThreads->0，testConnectionOnCheckin->false，testConnectionOnCheckout->false，unreturnedConnectionTimeout->0，UseStraditionalReflectionProxies->false；用户覆盖：{}]，dataSourceName->null，factoryClassLocation->null，identityToken->1hge14z9l1qg67m9nxywg8 | 7e276594，numHelperThreads->3]

以下是我设置的属性

<property name="hibernate.c3p0.acquire_increment">1</property>
<property name="hibernate.c3p0.idle_test_period">300</property>
<property name="hibernate.c3p0.timeout">120</property>
<property name="hibernate.c3p0.max_size">25</property>
<property name="hibernate.c3p0.min_size">1</property>
<property name="hibernate.c3p0.max_statement">0</property>
<property name="hibernate.c3p0.preferredTestQuery">select 1;</property>
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>

1
300
120
25
1.
0
选择1；
org.hibernate.connection.C3P0ConnectionProvider

下面是其中一个被锁定线程的线程转储

"Request Pool-0" #71 prio=5 os_prio=0 tid=0x000000002b2df800 nid=0x1d48 in Object.wait() [0x000000003113e000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1414)
    at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:606)
    - locked <0x00000006c1b3c088> (a com.mchange.v2.resourcepool.BasicResourcePool)
    at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:526)
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:755)
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:682)
    at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140)
    at org.hibernate.c3p0.internal.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:90)
    at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:387)
    at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:228)
    at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:171)
    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.connection(StatementPreparerImpl.java:63)
    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:162)
    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:186)
    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:160)
    at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1884)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1861)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1838)
    at org.hibernate.loader.Loader.doQuery(Loader.java:909)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)
    at org.hibernate.loader.Loader.doList(Loader.java:2553)
    at org.hibernate.loader.Loader.doList(Loader.java:2539)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2369)
    at org.hibernate.loader.Loader.list(Loader.java:2364)
    at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:126)
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1682)
    at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:380)
    at org.hibernate.internal.CriteriaImpl.uniqueResult(CriteriaImpl.java:402)
    at com.game.server.persistence.services.player.PlayerDataServiceImpl.areValidCredentials(PlayerDataServiceImpl.java:28)
    at com.game.server.manager.request.service.DefaultLoginService.login(DefaultLoginService.java:78)
    at com.game.server.manager.request.DefaultRequestManager.lambda$login$2(DefaultRequestManager.java:103)
    at com.game.server.manager.request.DefaultRequestManager$$Lambda$63/869031346.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

   Locked ownable synchronizers:
    - <0x000000079eea0890> (a java.util.concurrent.ThreadPoolExecutor$Worker)

对象中的“请求池-0”#71优先级=5 os_优先级=0 tid=0x000000002BF800 nid=0x1d48。等待（）[0x000000003113e000]
java.lang.Thread.State:正在等待（在对象监视器上）
在java.lang.Object.wait（本机方法）
位于com.mchange.v2.resourcepool.BasicResourcePool.waitAvailable（BasicResourcePool.java:1414）
位于com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource（BasicResourcePool.java:606）
-锁定（com.mchange.v2.resourcepool.BasicResourcePool）
位于com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource（BasicResourcePool.java:526）
在com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse（C3P0PooledConnectionPool.java:755）
在com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection（C3P0PooledConnectionPool.java:682）
位于com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection（AbstractPoolBackedDataSource.java:140）
位于org.hibernate.c3p0.internal.C3P0ConnectionProvider.getConnection（C3P0ConnectionProvider.java:90）
位于org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.ActainConnection（AbstractSessionImpl.java:387）
位于org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.ActainConnection（LogicalConnectionImpl.java:228）
位于org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection（LogicalConnectionImpl.java:171）
位于org.hibernate.engine.jdbc.internal.statementpresparerimpl.connection（statementpresparerimpl.java:63）
位于org.hibernate.engine.jdbc.internal.StatementPrepareImpl$5.doPrepare（statementPrepareImpl.java:162）
位于org.hibernate.engine.jdbc.internal.StatementPrepareImpl$StatementPreparationTemplate.prepareStatement（statementPrepareImpl.java:186）
位于org.hibernate.engine.jdbc.internal.statementPrepareImpl.prepareQueryStatement（statementPrepareImpl.java:160）
位于org.hibernate.loader.loader.prepareQueryStatement（loader.java:1884）
位于org.hibernate.loader.loader.executeQueryStatement（loader.java:1861）
位于org.hibernate.loader.loader.executeQueryStatement（loader.java:1838）
位于org.hibernate.loader.loader.doQuery（loader.java:909）
在org.hibernate.loader.loader.doQueryAndInitializeNonLazyCollections（loader.java:354）上
位于org.hibernate.loader.loader.doList（loader.java:2553）
位于org.hibernate.loader.loader.doList（loader.java:2539）
位于org.hibernate.loader.loader.listIgnoreQueryCache（loader.java:2369）
位于org.hibernate.loader.loader.list（loader.java:2364）
位于org.hibernate.loader.criteria.CriteriaLoader.list（CriteriaLoader.java:126）
位于org.hibernate.internal.SessionImpl.list（SessionImpl.java:1682）
位于org.hibernate.internal.CriteriaImpl.list（CriteriaImpl.java:380）
位于org.hibernate.internal.CriteriaImpl.uniqueResult（CriteriaImpl.java:402）
在com.game.server.persistence.services.player.PlayerDataServiceImpl.areValidCredentials上（PlayerDataServiceImpl.java:28）
在com.game.server.manager.request.service.DefaultLoginService.login上（DefaultLoginService.java:78）
位于com.game.server.manager.request.DefaultRequestManager.lambda$login$2（DefaultRequestManager.java:103）
位于com.game.server.manager.request.DefaultRequestManager$$Lambda$63/869031346.run（未知源）
位于java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）
位于java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:6
<property name="hibernate.c3p0.unreturnedConnectionTimeout">30</property>
<property name="hibernate.c3p0.debugUnreturnedConnectionStackTraces">true</property>