c3p0连接池超出maxPoolSize回报以下错误：
Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
### The error may exist in INF/classes/config/mybatis/phoneMapper.xml]
### The error may involve com.tuniu.finance.xff.auth.dao.AuthPhoneMapper.selectByMemberId
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30) ~[mybatis-3.3.1.jar:3.3.1]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:122) ~[mybatis-3.3.1.jar:3.3.1]
at sun.reflect.GeneratedMethodAccessor128.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_91]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91]
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358) ~[mybatis-spring-1.2.1.jar:1.2.1]
... 66 common frames omitted
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80) ~[spring-jdbc-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:83) ~[mybatis-spring-1.2.1.jar:1.2.1]
at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:69) ~[mybatis-spring-1.2.1.jar:1.2.1]
at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:315) ~[mybatis-3.3.1.jar:3.3.1]
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:75) ~[mybatis-3.3.1.jar:3.3.1]
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:61) ~[mybatis-3.3.1.jar:3.3.1]
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:303) ~[mybatis-3.3.1.jar:3.3.1]
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:154) ~[mybatis-3.3.1.jar:3.3.1]
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:102) ~[mybatis-3.3.1.jar:3.3.1]
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:82) ~[mybatis-3.3.1.jar:3.3.1]
at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_91]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91]
at org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49) ~[mybatis-3.3.1.jar:3.3.1]
at com.tuniu.finance.xff.auth.security.SecurityPlugin.interceptQuery(SecurityPlugin.java:53) ~[auth-intf-2.0.0.jar:na]
at com.tuniu.finance.xff.auth.security.SecurityPlugin.intercept(SecurityPlugin.java:76) ~[auth-intf-2.0.0.jar:na]
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61) ~[mybatis-3.3.1.jar:3.3.1]
at com.sun.proxy.$Proxy103.query(Unknown Source) ~[na:na]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120) ~[mybatis-3.3.1.jar:3.3.1]
... 70 common frames omitted
Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118) ~[mchange-commons-java-0.2.11.jar:0.2.11]
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:77) ~[mchange-commons-java-0.2.11.jar:0.2.11]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:690) ~[c3p0-0.9.5.2.jar:0.9.5.2]
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140) ~[c3p0-0.9.5.2.jar:0.9.5.2]
at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_91]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) ~[spring-aop-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) ~[spring-aop-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at com.sun.proxy.$Proxy45.getConnection(Unknown Source) ~[na:na]
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111) ~[spring-jdbc-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77) ~[spring-jdbc-4.3.8.RELEASE.jar:4.3.8.RELEASE]
... 88 common frames omitted
Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@5fb57348 -- timeout at awaitAvailable()
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1467) ~[c3p0-0.9.5.2.jar:0.9.5.2]
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:644) ~[c3p0-0.9.5.2.jar:0.9.5.2]
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:554) ~[c3p0-0.9.5.2.jar:0.9.5.2]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:758) ~[c3p0-0.9.5.2.jar:0.9.5.2]
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:685) ~[c3p0-0.9.5.2.jar:0.9.5.2]
... 97 common frames omitted
报错处的c3p0源码
/*
* by the semantics of wait(), a timeout of zero means forever.
*/
private void awaitAvailable(long timeout) throws InterruptedException, TimeoutException, ResourcePoolException
{
assert Thread.holdsLock( this );
if (force_kill_acquires)
throw new ResourcePoolException("A ResourcePool cannot acquire a new resource -- the factory or source appears to be down.");
Thread t = Thread.currentThread();
try
{
acquireWaiters.add( t );
int avail;
long start = ( timeout > 0 ? System.currentTimeMillis() : -1);
if (Debug.DEBUG && Debug.TRACE == Debug.TRACE_MAX)
{
if ( logger.isLoggable( MLevel.FINE ) )
logger.fine("awaitAvailable(): " +
(exampleResource != null ?
exampleResource :
"[unknown]") );
trace();
}
while ((avail = unused.size()) == 0)
{
// the if case below can only occur when 1) a user attempts a
// checkout which would provoke an acquire; 2) this
// increments the pending acquires, so we go to the
// wait below without provoking postAcquireMore(); 3)
// the resources are acquired; 4) external management
// of the pool (via for instance unpoolResource()
// depletes the newly acquired resources before we
// regain this' monitor; 5) we fall into wait() with
// no acquires being scheduled, and perhaps a managed.size()
// of zero, leading to deadlock. This could only occur in
// fairly pathological situations where the pool is being
// externally forced to a very low (even zero) size, but
// since I've seen it, I've fixed it.
if (pending_acquires == 0 && managed.size() < max)
_recheckResizePool();
this.wait(timeout);
if (timeout > 0 && System.currentTimeMillis() - start > timeout)
throw new TimeoutException("A client timed out while waiting to acquire a resource from " + this + " -- timeout at awaitAvailable()");
if (force_kill_acquires)
throw new CannotAcquireResourceException("A ResourcePool could not acquire a resource from its primary factory or source.");
ensureNotBroken();
}
}
finally
{
acquireWaiters.remove( t );
if (acquireWaiters.size() == 0)
this.notifyAll();
}
}
解决方案：
1.增加maxPoolSize大小
2.排查系统，减少db使用次数，优化代码
c3p0连接池使用情况查看
要开启jmx
