Glassfish example source code file (HelloEJB.java)

This example Glassfish source code file (HelloEJB.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

ejb, email, email, exception, hello, helloejb, into, jdbc, name, name, preparedstatement, preparedstatement, resource, servlet, sql, sqlexception, string, string, web, xml

The Glassfish HelloEJB.java source code

/*
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 *
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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package endpoint.ejb;

import javax.jws.WebService;
import javax.xml.ws.WebServiceRef;
import javax.ejb.Stateless;
import javax.ejb.SessionContext;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.annotation.Resource;
import java.sql.*;
import javax.sql.DataSource;

@WebService(endpointInterface="endpoint.ejb.Hello", targetNamespace="http://endpoint/ejb")
@Stateless
public class HelloEJB implements Hello {

    @Resource private SessionContext ctx;
    @Resource(mappedName="jdbc/__default") private DataSource ds;

    @TransactionAttribute(TransactionAttributeType.REQUIRED)
    public String sayHello(String who) {
	System.out.println("**** EJB Called");
	Connection con=null;
	String tableName = "CUSTOMER_rb1";
	String nameEntry = "Vikas";
	String emailEntry= "vikas@sun.com";

	try {
	con = ds.getConnection();
	System.out.println("**** auto commit = " + con.getAutoCommit());

	updateTable(con, tableName, nameEntry, emailEntry);
	readData(con, tableName);
        } catch(Exception ex) {
            throw new RuntimeException(ex);
        } finally {
	    try {
	    if(con != null) con.close();
	    } catch (SQLException se) {}
	}
	ctx.setRollbackOnly();
        return "WebSvcTest-Hello " + who;
    }

    private void updateTable(Connection con, String tableName, String name, String email) throws Exception {
        PreparedStatement pStmt = 
             con.prepareStatement("INSERT INTO "+ tableName +" (NAME, EMAIL) VALUES(?,?)");
	pStmt.setString(1, name);
	pStmt.setString(2, email);
        pStmt.executeUpdate();
    }

    private void readData(Connection con, String tableName) throws Exception {
        PreparedStatement pStmt = 
             con.prepareStatement("SELECT NAME, EMAIL FROM "+tableName);
        ResultSet rs = pStmt.executeQuery();
        while(rs.next()){
            System.out.println("NAME="+rs.getString(1)+", EMAIL="+rs.getString(2));
        }
    }
}