NullPointerException at oracle.jdbc.driver.OracleDriver.connect()

Question

I have written a java stored procedure. The method can be executed properly in local PC environment.
but when the java program is load into Oracle DB JVM by loadjava command. such method is called in SQL> prompt as a java stored procedure. I got
java.lang.NullPointerException
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:379)
at java.sql.DriverManager.getConnection(DriverManager.java:573)
at java.sql.DriverManager.getConnection(DriverManager.java:187)
at WCZSynchronizer.testLocalConn(WCZSynchronizer:901)
as shown in the trace file.
The line in my own java program WCZSynchronizer is simply
Connection conn = java.sql.DriverManager.getConnection(db_connection_string,username,password);
I am sure that the db_connection_string, username and password are correct as it works in my local PC.
I even try to get default connection by
Connection conn = java.sql.DriverManager.getConnection("jdbc:default:connection:");
and
Connection conn = new oracle.jdbc.driver.OracleDriver().defaultConnection();
I got the same NullPointerException in both cases too.
In fact, the java stored procedure worked before. but suddenly it's failed! The Oracle DB server is under my control and I did not change any configuration nor setting on it.
I can't find similar case from this forum. Do any one know why?
thanks.

Answer 1

First try debugging the test case by making sure that none of the parameters passed to getConnection is null.
When you are sure that none of the parameters are null, if the issue still reproduces. Let us know
- The driver version
- The jar file you are using
cheers
Ashok