Hi,
We are trying to work a simple EJB 3 application. Our goal is to post a
stateless bean and acces to it from a web application.
We are developing it with eclipse. Here is the program structure:
-A java application that contains two interfaces and the bean (also a metainf)
to implement the stateless bean.
-A web application 2.4 (we had tried also with 2.5).
We deploye the bean as a jar in the jboss, and it seems to recognize it. But
when we try to acces with the web app (via servlet) we got an
java.nullPointerException.
Ejb Code:
| import java.sql.ResultSet;
| import java.sql.SQLException;
| import javax.ejb.Remote;
|
|
| /**
| * This is the business interface for Carp enterprise bean.
| */
| @Remote
| public interface EjbRemote {
|
| boolean doStatement(String queryName) throws SQLException;
|
| ResultSet doQuery(String query) throws SQLException;
|
| void printQuery(String query);
| }
|
| import java.sql.ResultSet;
| import java.sql.SQLException;
| import javax.ejb.Local;
| @Local
| public interface EjbLocal {
|
| boolean doStatement(String queryName) throws SQLException;
|
| ResultSet doQuery(String query) throws SQLException;
|
| void printQuery(String query);
| }
|
| import javax.annotation.Resource;
| import javax.ejb.Stateless;
| import javax.sql.DataSource;
| import java.sql.Statement;
| import java.sql.Connection;
| import java.sql.ResultSet;
| import java.sql.SQLException;
|
| @Stateless
| public class EjbBean implements EjbLocal, EjbRemote {
|
| @Resource(mappedName = "TACWDS") DataSource TACWDS;
|
| public EjbBean() {
|
| }
|
| public boolean doStatement(String query) {
| //TODO implement doStatement
| return false;
| }
|
| public final ResultSet doQuery(String query) throws SQLException {
| System.out.println("Esecuzione query : " + query);
| Connection conn = TACWDS.getConnection();
| Statement stm = conn.createStatement();
| return stm.executeQuery(query);
| }
|
| public final void printQuery(String query) {
| System.out.println("Esecuzione query : " + query);
| }
| }
|
Servlet Code:
|
| public class appServlet extends HttpServlet {
| @EJB EjbLocal sless;
|
| public void service(HttpServletRequest req, HttpServletResponse resp)
| throws ServletException, IOException{
|
| resp.setContentType("text/html");
| PrintWriter out = resp.getWriter();
| //sless.printQuery("SELECT * FROM FOO");
|
| System.out.println("sless state: "+sless);
| }
| }
|
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4117092#4117092
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4117092
_______________________________________________
jboss-user mailing list
[email protected]
https://lists.jboss.org/mailman/listinfo/jboss-user
