NullPointer in conn.prepareCall

Question

I am trying to execute a java stored procedure (function) via JDBC code. In the conn.prpareCall method call I get a NullPointerException. The stored procedure (function) excutes pefectly from SQl*plus so that rules out the stored procedure not being deployed properly.
The code is pasted below.
* The Java Stored procedure
public class FirstJavaStoredProc {
public FirstJavaStoredProc() {
public static String prependHello(String tail) {
          return "Hello " + tail;
} //end of class
AND
* The 'client' JDBC code
import java.sql.*;
public class FirstJavaStoredProcCall {
private CallableStatement oCallStmt;
private Connection conn;
//Method that runs the example
public String runStoredProc() throws SQLException {
     String strName = "Is There Anyone out there";
     String strOutput = "";
//Prepare the callable statement object
     oCallStmt = conn.prepareCall("{? = call PREPENDHELLO(?)}");
     //registering output param
oCallStmt.registerOutParameter(1,Types.VARCHAR);
     //setting input param
     oCallStmt.setString(1,strName);
     //executing
     oCallStmt.execute();
     //getting the result
     strOutput = oCallStmt.getString(1);
     return strOutput;
//Main method
public static void main (String args[]) {
try {
String dbUrl = "jdbc:oracle:thin:@ABHIMACHINE:1521:vermadb";
     String user = "scott";
     String password = "tiger";
     Class.forName("oracle.jdbc.driver.OracleDriver");
     Connection conn = DriverManager.getConnection(dbUrl, user, password);
FirstJavaStoredProcCall obj = new FirstJavaStoredProcCall();
String str = obj.runStoredProc();
     System.out.println(str);
conn.close();
catch (Exception e) {
e.printStackTrace();
} //End of method main
}//end of class
* The excpetion stacktrace
java.lang.NullPointerException:
     at com.gepower.gees.ico.dao.FirstJavaStoredProcCall.runStoredProc(FirstJavaStoredProcCall.java:16)
     at com.gepower.gees.ico.dao.FirstJavaStoredProcCall.main(FirstJavaStoredProcCall.java:40)
The exception is being thrown on the line
oCallStmt = conn.prepareCall("{? = call PREPENDHELLO(?)}");
What is wrong??
Please help !!!
Thanks in advance
Abhi

Answer 1

Plz ignore this !!! There was a dumb mistake. Its working now
-Abhi