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我遇到了C3P0 APPARENT DEAD的问题。我在这里看过很多其他相关的问题，但无法解决问题。如果有人可以提出任何可能的解决方案，那将是感恩！明显死锁c3p0问题
C3P0版本：在控制台视图c3p0-0.9.5.2
C3P0配置XML文件
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="oracle.jdbc.driver.OracleDriver" />
<property name="jdbcUrl"
value="jdbc:oracle:thin:@transport-crash-ora-tst.cee.wisc.edu:1521:DTCRDBT" />
<property name="user" value="transdev" />
<property name="password" value="Its2$123" />
<property name="maxPoolSize" value="10" />
<property name="maxStatements" value="0" />
<property name="minPoolSize" value="5" />
<property name="statementCacheNumDeferredCloseThreads" value="1"></property>
</bean>
消息
[localhost-startStop-1] INFO com.mchange.v2.c3p0.C3P0Registry - Initializing c3p0-0.9.5.2 [built 08-December-2015 22:06:04 -0800; debug? true; trace: 10]
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
[localhost-startStop-1] INFO com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource - Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, contextClassLoaderSource -> caller, dataSourceName -> 72r5me9i3xucoj6ds3mi|10319844, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> oracle.jdbc.driver.OracleDriver, extensions -> {}, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false, identityToken -> 72r5me9i3xucoj6ds3mi|10319844, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> jdbc:oracle:thin:@transport-crash-ora-tst.cee.wisc.edu:1521:DTCRDBT, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 10, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 5, numHelperThreads -> 3, preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 1, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]
[localhost-startStop-1] WARN com.mchange.v2.resourcepool.BasicResourcePool - Bad pool size config, start 3 < min 5. Using 5 as start.
[C3P0PooledConnectionPoolManager[identityToken->72r5me9i3xucoj6ds3mi|10319844]-AdminTaskTimer] WARN com.mchange.v2.async.ThreadPoolAsynchronousRunner - com[email protected]7bd1346f -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!
[C3P0PooledConnectionPoolManager[identityToken->72r5me9i3xucoj6ds3mi|10319844]-AdminTaskTimer] WARN com.mchange.v2.async.ThreadPoolAsynchronousRunner - com[email protected]7bd1346f -- APPARENT DEADLOCK!!! Complete Status:
Managed Threads: 3
Active Threads: 3
Active Tasks:
com[email protected]342bcf5e
on thread: C3P0PooledConnectionPoolManager[identityToken->72r5me9i3xucoj6ds3mi|10319844]-HelperThread-#2
com[email protected]46abe7f8
on thread: C3P0PooledConnectionPoolManager[identityToken->72r5me9i3xucoj6ds3mi|10319844]-HelperThread-#1
com[email protected]5d53fa5
on thread: C3P0PooledConnectionPoolManager[identityToken->72r5me9i3xucoj6ds3mi|10319844]-HelperThread-#0
Pending Tasks:
com[email protected]3ebf49a7
com[email protected]54043011
Pool thread stack traces:
Thread[C3P0PooledConnectionPoolManager[identityToken->72r5me9i3xucoj6ds3mi|10319844]-HelperThread-#2,5,main]
java.net.PlainSocketImpl.socketConnect(Native Method)
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
java.net.Socket.connect(Socket.java:589)
oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:162)
oracle.net.nt.ConnOption.connect(ConnOption.java:133)
oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:411)
oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:464)
oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:594)
oracle.net.ns.NSProtocol.connect(NSProtocol.java:229)
oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1360)
oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:486)
oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:715)
oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)
com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
Thread[C3P0PooledConnectionPoolManager[identityToken->72r5me9i3xucoj6ds3mi|10319844]-HelperThread-#0,5,main]
java.net.PlainSocketImpl.socketConnect(Native Method)
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
java.net.Socket.connect(Socket.java:589)
oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:162)
oracle.net.nt.ConnOption.connect(ConnOption.java:133)
oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:411)
oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:464)
oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:594)
oracle.net.ns.NSProtocol.connect(NSProtocol.java:229)
oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1360)
oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:486)
oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:715)
oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)
com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
Thread[C3P0PooledConnectionPoolManager[identityToken->72r5me9i3xucoj6ds3mi|10319844]-HelperThread-#1,5,main]
java.net.PlainSocketImpl.socketConnect(Native Method)
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
java.net.Socket.connect(Socket.java:589)
oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:162)
oracle.net.nt.ConnOption.connect(ConnOption.java:133)
oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:411)
oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:464)
oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:594)
oracle.net.ns.NSProtocol.connect(NSProtocol.java:229)
oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1360)
oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:486)
oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:715)
oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)
com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)