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Getting an obsolete connection using OracleDataSource with an OCI driver

I get an outdated connection error when for several hours there are no database queries from my Java application.

This is a simple Java application running on a Linux box with OCI (driver type). Do not ask me why OCI, why not lose weight. I use OracleDataSourceand OracleConnectionCacheManagerto save the cache connection objects. Here is the code snippet:

import java.sql.Connection; 
import java.sql.SQLException; 
import java.util.Properties; 

import oracle.jdbc.pool.OracleConnectionCacheManager; 
import oracle.jdbc.pool.OracleDataSource; 

import org.apache.log4j.Logger; 

import com.exception.DataException; 

public class ConnectionManager { 
private static OracleDataSource poolDataSource = null; 
private final static String CACHE_NAME = "CONNECTION_POOL_CACHE"; 
private static OracleConnectionCacheManager occm = null; 

public static void init(String url,String userId,String password) throws PCTDataException{ 
Properties cacheProps = null; 
try { 
poolDataSource = new OracleDataSource(); 
poolDataSource.setURL(url); 
poolDataSource.setUser(userId); 
poolDataSource.setPassword(password); 

cacheProps = new Properties(); 
cacheProps.setProperty("MinLimit", "1"); 
cacheProps.setProperty("MaxLimit", "5"); 
cacheProps.setProperty("InitialLimit", "1"); 
cacheProps.setProperty("ValidateConnection", "true"); 

poolDataSource.setConnectionCachingEnabled(true); 
occm = OracleConnectionCacheManager.getConnectionCacheManagerInstance(); 
occm.createCache(CACHE_NAME, poolDataSource, cacheProps); 
occm.enableCache(CACHE_NAME); 
} catch (SQLException se) { 
throw new DataException("SQL Exception while initializing connection pool"); 
}catch(Exception e){ 
throw new DataException("Exception while initializing connection pool"); 
} 
} 

public static Connection getConnection() throws PCTDataException { 
try{ 
if (poolDataSource == null) { 
throw new SQLException("OracleDataSource is null."); 
} 
occm.refreshCache(CACHE_NAME, OracleConnectionCacheManager.REFRESH_INVALID_CONNECTIONS); 
Connection connection = poolDataSource.getConnection(); 
return connection; 
}catch(SQLException se){ 
se.printStackTrace(); 
throw new DataException("Exception while getting Connection object"); 
}catch(Exception e){ 
e.printStackTrace(); 
throw new DataException("Exception while getting Connection object"); 
} 
} 

public static void closePooledConnections() { 
try{ 
if (poolDataSource != null) { 
poolDataSource.close(); 
} 
}catch(SQLException se){ 
}catch(Exception e){ 
} 

} 
}

The error is as follows:

ConnectionManager.java:getConnection:87 - Exception while getting Connection object: 
java.sql.SQLException: Invalid or Stale Connection found in the Connection Cache 
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) 
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146) 
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:208) 
at oracle.jdbc.pool.OracleImplicitConnectionCache.getConnection(OracleImplicitConnectionCache.java:390) 
at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:404) 
at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:189)

What am I missing?

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3 answers

, keep alives? , , ping , , . , . , , . , , , , , . , .

+1

OracleDataSource + OracleConnectionCacheManager OracleOCIConnectionPool, OCI.

OracleDataSource, PoolConfig OracleDataSource, OracleOCIConnectionPool .

+1

, , " ". , .

  • dba. , "ALTER SYSTEM KILL SESSION"
  • , - -, database (idle_time)
  • A network event triggered a connection to the transition, probably because the network became unavailable or the firewall disconnected a connection that had been open for too long.

Run the query below to determine the IDLE_TIME put into effect by the database

select * from dba_profiles dp, dba_users du
where dp.profile = du.profile and du.username ='YOUR_JDBC_USER_NAME';

Now try the following configuration

Properties cacheProps = new Properties(); 
cacheProps.setProperty("MinLimit", "0"); 
cacheProps.setProperty("MaxLimit", "5"); 
cacheProps.setProperty("InitialLimit", "1"); 
cacheProps.setProperty("ValidateConnection", "true");
cacheProps.setProperty("InactivityTimeout", "17000"); //something lower than the DB IDLE_TIME
cacheProps.setProperty("PropertyCheckInterval", "16000") /*something lower than the inactivity timeout
 - to make sure that connections which were inactive for more than InactivityTimeout
 are always removed from the pool*/
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