Question

我正在尝试使用c3p0连接到RDS，当不使用RDS时，代码可以运行，但对于RDS则失败，带有DriverManager的纯Java可以创建连接，使我相信问题出在c3p0

connectionPool.setUser(user);
connectionPool.setPassword(password);
connectionPool.setJdbcUrl(jdbc);
try {
    Connection con = connectionPool.getConnection();//fails after several seconds
    con.isValid(1);
    con.close();
} catch (SQLException e) {
    e.printStackTrace();
}
try {
    Connection con = DriverManager.getConnection(jdbc, user, password);
    con.isValid(1);//true
    con.close();
} catch (SQLException e) {
    e.printStackTrace();
}

但是c3p0归咎于postgres

java.sql.SQLException：无法从基础数据库获取连接！在com.mchange.v2.sql.SqlUtils.toSQLException（SqlUtils.java:118）在com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection（C3P0PooledConnectionPool.java:692）在com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection（AbstractPoolBackedDataSource.java:140）在我的代码中，“ connectionPool.getConnection（）”行由以下原因引起：com.mchange.v2.resourcepool.CannotAcquireResourceException：ResourcePool无法从其主工厂或源中获取资源。在com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable（BasicResourcePool.java:1469）在com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource（BasicResourcePool.java:644）在com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource（BasicResourcePool.java:554）在com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse（C3P0PooledConnectionPool.java:758）在com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection（C3P0PooledConnectionPool.java:685） ...另外13个引起原因：org.postgresql.util.PSQLException：此ResultSet已关闭。在org.postgresql.jdbc2.AbstractJdbc2ResultSet.checkClosed（AbstractJdbc2ResultSet.java:2852）在org.postgresql.jdbc2.AbstractJdbc2ResultSet.setFetchSize（AbstractJdbc2ResultSet.java:1875）在org.postgresql.jdbc4.Jdbc4Statement.createResultSet（Jdbc4Statement.java:37）在org.postgresql.jdbc2.AbstractJdbc2Statement $ StatementResultHandler.handleResultRows（AbstractJdbc2Statement.java:221）在org.postgresql.core.v3.QueryExecutorImpl.processResults（QueryExecutorImpl.java:1853）在org.postgresql.core.v3.QueryExecutorImpl.execute（QueryExecutorImpl.java:255）在org.postgresql.jdbc2.AbstractJdbc2Statement.execute（AbstractJdbc2Statement.java:561）在org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags（AbstractJdbc2Statement.java:405）在org.postgresql.jdbc2.AbstractJdbc2Connection.execSQLUpdate（AbstractJdbc2Connection.java:382）在org.postgresql.jdbc2.AbstractJdbc2Connection.getTransactionIsolation（AbstractJdbc2Connection.java:904）在com.mchange.v2.c3p0.impl.NewPooledConnection。（NewPooledConnection.java:120）在com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection（WrapperConnectionPoolDataSource.java:240）在com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection（WrapperConnectionPoolDataSource.java:206）在com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool $ 1PooledConnectionResourcePoolManager.acquireResource（C3P0PooledConnectionPool.java:203）在com.mchange.v2.resourcepool.BasicResourcePool.doAcquire（BasicResourcePool.java:1138）在com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess（BasicResourcePool.java:1125）中在com.mchange.v2.resourcepool.BasicResourcePool.access $ 700（BasicResourcePool.java:44）在com.mchange.v2.resourcepool.BasicResourcePool $ ScatteredAcquireTask.run（BasicResourcePool.java:1870）在com.mchange.v2.async.ThreadPoolAsynchronousRunner $ PoolThread.run（ThreadPoolAsynchronousRunner.java:696）引用

我尝试使用connectionPool.setDriverClass，但没有帮助我使用的是hibernate-c3p0 https://mvnrepository.com/artifact/org.hibernate/hibernate-c3p0/5.4.2.Final上的java11和c3p0，试图更新到最新的beta，这没有帮助

带有Amazon Postgres RDS的c3p0

0 个答案: