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我有一個java客戶端服務器，應該在啓動時建立連接池，但其超時錯誤失敗。上有同樣的問題這麼多線程，但沒有解決方案的使用JDK 7爲我工作java.sql.SQLException：客戶端嘗試檢出連接已超時
AM以下是mchange行家依賴
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.2.1</version>
</dependency>
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
這裏是我的DAO類，它在服務器啓動時建立連接池
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;
}
}
這裏是堆棧跟蹤
[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 [email protected] -- 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
有人可以幫助我什麼是錯的，我的配置/代碼？
您是否在另一個工具中測試了這些參數以驗證它們是否工作？ – 2014-10-29 17:18:10
是的，我能夠以相同的憑據登錄到SQL Server管理工作室，我也有其他的網絡應用程序，它運行良好，具有相同的jdbc屬性 – RanPaul 2014-10-29 17:19:43
也許這是一個網絡問題，確保你啓動這個應用程序的服務器可以' ping「到數據庫服務器。 – 2014-10-29 17:21:02