Java connectivity issues

I have never received this error before. Why am I getting this error and how can I fix it?

Symptoms

The JDBC URL is defined in the common.properties file.

Diagnosing the problem

Test the Java™ connectivity from the Product Master URL to the JDBC URL.

Resolving the problem

Use the following script to attempt to connect to the database and run a simple select count(*) from dual SQL command. If a connection is established, the results from the test script appear. $TOP/bin/test_db.sh