Problem connecting to DB after DB restart

Question

Hi,
I am using Oracle9.1 and WLS 8.1 sp6. My application runs fine and is able to connect to database and everything looks great.
Problem starts when for xyz reason database is stopped/down, say for maintenance. My application gets exception as expected. But even after restarting the Database, my application keeps getting the exception "SQLException: Closed Connection", which does not make sense.
Can anyone please help?
I am using WLS Connection Pool. I access the database through JDBC and get the connection using a DataSource that I have configured on the server. The driver is oracle.jdbc.OracleDriver.
This is how I get the connection.
code:
     protected Connection getConnection() throws CatalogDAOSysException {          if (dataSrc == null) {               try {                    ServiceLocatorImpl sl = ServiceLocatorImpl.getInstance();                    //System.out.println(JNDINames.CATALOG_DATASOURCE);                    dataSrc = (DataSource) sl.getDataSource(JNDINames.CATALOG_DATASOURCE);               } catch (Exception slx) {                    slx.printStackTrace();                    throw new CatalogDAOSysException("NamingException while looking up DB context : "                         + slx.getMessage());               }               try {                    Connection c = dataSrc.getConnection();                    if (c == null) {                         throw new CatalogDAOSysException("getConnection: Unable to get connection from the DataSource");                    }                    return c;               } catch (SQLException se) {                    this.logger.error(new Date() + " SQLException. ErrorCode : "                               + se.getErrorCode() + "  SQL State" + se.getSQLState() , se);                    throw new CatalogDAOSysException(                              "getConnection: SQLException while getting connection from the DataSource",                              "error.connection", se);               }          }     }
I am not sure what other details might be needed. Please let me know if you need to know anything else.
Thanks,
Sushma

Answer 1

Sushma Sharma wrote:
Hi,
I am using Oracle9.1 and WLS 8.1 sp6. My application runs fine and is able to connect to database and everything looks great.
Problem starts when for xyz reason database is stopped/down, say for maintenance. My application gets exception as expected. But even after restarting the Database, my application keeps getting the exception "SQLException: Closed Connection", which does not make sense.
Can anyone please help?
I am using WLS Connection Pool. I access the database through JDBC and get the connection using a DataSource that I have configured on the server. The driver is oracle.jdbc.OracleDriver.
This is how I get the connection.
code:
     protected Connection getConnection() throws CatalogDAOSysException {          if (dataSrc == null) {               try {                    ServiceLocatorImpl sl = ServiceLocatorImpl.getInstance();                    //System.out.println(JNDINames.CATALOG_DATASOURCE);                    dataSrc = (DataSource) sl.getDataSource(JNDINames.CATALOG_DATASOURCE);               } catch (Exception slx) {                    slx.printStackTrace();                    throw new CatalogDAOSysException("NamingException while looking up DB context : "                         + slx.getMessage());               }               try {                    Connection c = dataSrc.getConnection();                    if (c == null) {                         throw new CatalogDAOSysException("getConnection: Unable to get connection from the DataSource");                    }                    return c;               } catch (SQLException se) {                    this.logger.error(new Date() + " SQLException. ErrorCode : "                               + se.getErrorCode() + "  SQL State" + se.getSQLState() , se);                    throw new CatalogDAOSysException(                              "getConnection: SQLException while getting connection from the DataSource",                              "error.connection", se);               }          }     }
I am not sure what other details might be needed. Please let me know if you need to know anything else.
Thanks,
SushmaThe pool should be configured to test-on-reserve, and the test table should be 'DUAL'.
Joe