Getting ClassNotFoundException for external java method stored procedure in weblogic

package net.local.util.common;

import java.sql.*;
import org.apache.log4j.Logger;
import com.pointbase.jdbc.*;


public class DBLog {
	
	
	private static final Logger logger = Logger.getLogger(DBLog.class);
	private static boolean DEBUGGING = logger.isDebugEnabled();
	private static Connection conn = null;
	private static Statement m_stmt;
	private static Statement l_stmt;
	private static CallableStatement m_callStmt = null;
		
	
public DBLog() {
	
	logger.info("DbLog constructor called");
	init();
	
}

public void init() {
	logger.info("DbLog init called");
}

public void logPreAuth() {
	
	try {
		logger.info("Inside logPreAuth method");
			
		String I_URL = "jdbc:pointbase:server://localhost:9093/weblogic_eval";
		//Class.forName("com.pointbase.jdbc.jdbcUniversalDriver").newInstance();
		Class.forName("com.pointbase.jdbc.jdbcUniversalDriver");
		conn = DriverManager.getConnection(I_URL, "PBPUBLIC", "PBPUBLIC");
		
		doCreateProc();	
		doInvokeProc();
	}

	catch (Exception e) {
		logger.error("Error in logforSSP method" + e);
	}
	finally {
		if (m_stmt != null) {
			try {
				m_stmt.close();
			}
			catch (Exception e) {
				logger.info("Exception" + e);
			}
		}
		
		if (m_callStmt != null) {
			try {
				m_callStmt.close();
			}
			catch(Exception e) {
				logger.info("Exception: " + e);
			}
		}
		
		if (conn != null) {
			try {
				conn.close();
			}
			catch(Exception e) {
				logger.info("Exception :" + e);
			}
		}
	}

	}

public static void doCreateProc() throws SQLException {
	String SQL_CREATE_PROC = "CREATE PROCEDURE insLog(IN P1 VARCHAR(30))"
		+ " LANGUAGE JAVA"
		+ " SPECIFIC insLog"
		+ " DETERMINISTIC"
		+ " NO SQL"
		+ " EXTERNAL NAME \"DBLog::insLog\""
		+ " PARAMETER STYLE SQL"; 
	
	m_stmt = conn.createStatement();
	m_stmt.executeUpdate(SQL_CREATE_PROC);
	//m_stmt.close();  
	logger.info("SP Created");
}

public static void doInvokeProc() throws SQLException 
{
		
		m_callStmt = conn.prepareCall("{ call PBPUBLIC.insLog(?) }");
		m_callStmt.setString(1, "Success!!");
		m_callStmt.executeUpdate(); 
				
		logger.info("SP executed");
		//l_rs = l_stmt.executeQuery("Insert into logs values('" + test + "')");
		//l_stmt.executeUpdate("Insert into logs values('" + test + "')");
		
		
	
}

public static void insLog(String test) {
	try {
		l_stmt = conn.createStatement();
		l_stmt.execute("Insert into logs values('" + test + "')");
		//l_rs.close();
		l_stmt.close();
	}
	catch(SQLException e){
		logger.info("SQL Exception: " + e);
	}
	finally {
		if (l_stmt != null) {
			try{
				l_stmt.close();
			}
			catch(Exception e) {
				logger.info("Exception: " + e);
			}
		}
	}
}

}

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