java.sql.SQLException:客户端尝试检出Connection的尝试已超时 [英] java.sql.SQLException: An attempt by a client to checkout a Connection has timed out
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问题描述
我有一个Java客户端服务器，该服务器应该在启动时建立连接池，但是在超时错误时失败.在同一问题上有很多线程，但是没有一个解决方案对我有用
I have a java client server which is supposed to establish connection pool on startup but its failing on timeout error. There are so many threads on this same issue but none of the solutions worked for me
使用jdk 7及更低版本的AM是mchange maven依赖项
AM using jdk 7 and below is the mchange maven dependency
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.2.1</version>
</dependency>
jdbc.properties
jdbc.properties
url=jdbc\:sqlserver\://server\\instance;databaseName\=db
driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
user=admin
password=admin
maxPoolSize=20
minPoolSize=5
acquireIncrement=5
这是我的DAO类，它在服务器启动时建立连接池
Here is my DAO class which establishes connection-pool on server startup
public class ShareDocDAO {
//..........
private static Connection getConnection() throws SQLException {
LOG.info("Getting DB connection");
ComboPooledDataSource cpds = getPool();
return cpds.getConnection(); //Line 36:
}
private static ComboPooledDataSource getPool() {
if (pool!=null) {
return pool;
}
ComboPooledDataSource cpds = new ComboPooledDataSource();
try {
Properties dbProperties = getDbProperties();
//loads the jdbc driver
cpds.setDriverClass(dbProperties.getProperty("driver"));
cpds.setJdbcUrl(dbProperties.getProperty("url"));
cpds.setUser(dbProperties.getProperty("user"));
cpds.setPassword(dbProperties.getProperty("password"));
// the settings below are optional -- c3p0 can work with defaults
cpds.setMinPoolSize(Integer.valueOf(dbProperties.getProperty("minPoolSize")));
cpds.setAcquireIncrement(Integer.valueOf(dbProperties.getProperty("acquireIncrement")));
cpds.setMaxPoolSize(Integer.valueOf(dbProperties.getProperty("maxPoolSize")));
cpds.setCheckoutTimeout(30000);
cpds.setIdleConnectionTestPeriod(10800);
cpds.setMaxIdleTime(21600);
LOG.info("cpds driver "+cpds.getDriverClass()+ " JDBC URL = "+cpds.getJdbcUrl() +" User = "+cpds.getUser()+ " Pwd = "+cpds.getPassword()+ " MinPoolSize "+cpds.getMinPoolSize() +" AcquireIncrement "+cpds.getAcquireIncrement() +" MaxPoolSize "+cpds.getMaxPoolSize());
} catch (Exception ex) {
LOG.error("failed to create pool", ex);
}
pool = cpds;
return pool;
}
}
这是堆栈跟踪
[Oct 29 11:58:22] SSLHandshake-3 | ERROR | com.dc.ssltunnel.server.ShareDocDAO | Error querying for User Information
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)
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:77)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:687)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140)
at com.dc.ssltunnel.server.ShareDocDAO.getConnection(ShareDocDAO.java:36)
at com.dc.ssltunnel.server.ShareDocDAO.checkSerialNumber(ShareDocDAO.java:75)
at com.dc.ssltunnel.server.MainServer.retrieveOrCreateClient(MainServer.java:95)
at com.dc.ssltunnel.server.MainServerHandshakeThread.handshake(MainServerHandshakeThread.java:58)
at com.dc.ssltunnel.server.MainServerHandshakeThread.run(MainServerHandshakeThread.java:71)
at com.dc.ssltunnel.utilities.threading.ShutdownThreadPoolExecutor$1.run(ShutdownThreadPoolExecutor.java:36)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@3414b7f8 -- timeout at awaitAvailable()
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1416)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:606)
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)
... 12 more
[Oct 29 11:58:22] SSLHandshake-3 | DEBUG | com.dc.ssltunnel.server.MainServerHandshakeThread | Handshake thread is done
[Oct 29 11:58:22] SSLHandshake-3 | DEBUG | com.dc.ssltunnel.server.MainServerHandshakeThread | Handshake thread is done
[Oct 29 11:58:22] SSLHandshake-1 | INFO | com.dc.ssltunnel.server.ShareDocDAO | Getting DB connection
[Oct 29 11:58:22] SSLHandshake-1 | INFO | com.dc.ssltunnel.server.ShareDocDAO | Getting DB connection
[Oct 29 11:58:22] SSLHandshake-3 | DEBUG | com.dc.ssltunnel.utilities.threading.ShutdownThreadPoolExecutor | RUNNABLE:removing total:2
[Oct 29 11:58:22] SSLHandshake-3 | DEBUG | com.dc.ssltunnel.utilities.threading.ShutdownThreadPoolExecutor | RUNNABLE:removing total:2
[Oct 29 11:58:22] SSLHandshake-1 | ERROR | com.dc.ssltunnel.server.ShareDocDAO | Error querying for User Information
java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:689)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140)
at com.dc.ssltunnel.server.ShareDocDAO.getConnection(ShareDocDAO.java:36)
at com.dc.ssltunnel.server.ShareDocDAO.checkSerialNumber(ShareDocDAO.java:75)
at com.dc.ssltunnel.server.MainServer.retrieveOrCreateClient(MainServer.java:95)
at com.dc.ssltunnel.server.MainServerHandshakeThread.handshake(MainServerHandshakeThread.java:58)
at com.dc.ssltunnel.server.MainServerHandshakeThread.run(MainServerHandshakeThread.java:71)
at com.dc.ssltunnel.utilities.threading.ShutdownThreadPoolExecutor$1.run(ShutdownThreadPoolExecutor.java:36)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1418)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:606)
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)
... 12 more
有人可以帮我配置/代码有什么问题吗?
Can someone please help me whats wrong with my config/code?
推荐答案
问题通常是
Transaction.Begin()不能直接或间接调用.因此这可能是会话，SessionFactory或配置的问题
Transaction.Begin() is not called directly or indirectly. so this can be a problem with a session, SessionFactory or configurations
您始终可以通过对会话对象执行查询来调试该调试器，如果该测试查询有效，则向其添加一个事务，然后适当地进行begin()，commit()
You can always debug this by, doing a Query with your session object, if that test query works then add a transaction to it and begin(), commit() appropriately
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