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JDBC 4.0 and Oracle JDeveloper for J2EE Development
You might get errors while configuring a JDBC connection. If you are using MySQL, and the connection URL is incorrect, or the MySQL database is not running, the following error message is generated:
Communications link failure
If you are using Oracle database, some possible connection configuration errors are listed below:
IO exception: The Network Adapter could not establish the connection
IO exception: Connection refused
The The Network Adapter could not establish the connection exception is caused by one or more of the following configuration errors:
1. The database host name, port number, or database instance name is wrong.
2. The database TNSListener has not been started. The TNSListener may be started with the lsnrctl utility.
C:\>lsnrctl start
The Connection refused exception is caused by one or more of the following configuration errors:
1. The database SID specified is incorrect.
2. The database instance has not been started. To start the database instance...
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