Help on JSP-RMI connection

Hi..
can anyone provide me any tutorial/link which will help me in learning JSP and RMI connection. Like I need to acces RMI server object from JSP.

Hi ...
I didn't get any reply from any one....
Is it possible to make Java Server Pages and RMI work together -
to invoke a method on a server object from a JSP? And if, does
someone know of a good tutorial, article etc., on this matter?
waiting for ur reply!!!!

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Help need to know about JSP-RMI connection

Hi All...
Can anyone send me any tutorial/link about JSP-RMI connection. I need to access a RMI server object from JSP page.Is it possible?
Looking for your responds.....

Hi ...
I didn't get any reply from any one....
Is it possible to make Java Server Pages and RMI work
together -sure, jsp's can make requests to servlets which can then talk to remote objects, then a response can be sent back down to the jsp
to invoke a method on a server object from a JSP? And
if, does
someone know of a good tutorial, article etc., on
this matter?hmm, Google, JSP Tutorial, RMI Tutorial, etc.

Very very urgent. Please help. JSP - JDBC connectivity.

Hi.
Can any one guide me the methods and steps to be followed for storing the input entered on a JSP front end into a database. Also help is needed for retrieving the data from the table and displaying on the front end. Please reply as early as possible as I am stuck in my work due to this reason. Please do reply as soon as possible,.
Regards
Venkat

What part don't you understand?Here are my guesses about what the OP doesn't understand:
>
JSP? Yes.
JDBC? Yes.
Relational databases? Yes.
Deploying Web apps? Yes.
Your servlet/JSP container? Yes.
What? Yes.Again, just wild guesses. :-)

Using JSP to connect to an Access Database

I need help on using JSP to connect to an Access database.
This is the code I currently have connecting to a mySQL DB. I need to change it to connect to an Access DB. The reason I am switching DB's is because mySQL is no longer going to be carried by my host.
Here is the code:
<html>
<head>
<basefont face="Arial">
</head>
<body>
<%@ page language="java" import="java.sql.*" %>
<%!
// define variables
String UId;
String FName;
String LName;
// define database parameters
String host="localhost";
String user="us867";
String pass="jsf84d";
String db="db876";
String conn;
%>
<table border="2" cellspacing="2" cellpadding="5">
<tr>
<td>Owner</td>
<td>First name</td>
<td>Last name</td>
</tr>
<%
Class.forName("org.gjt.mm.mysql.Driver");
// create connection string
conn = "jdbc:mysql://" + host + "/" + db + "?user=" + user + "&password=" +
pass;
// pass database parameters to JDBC driver
Connection Conn = DriverManager.getConnection(conn);
// query statement
Statement SQLStatement = Conn.createStatement();
// generate query
String Query = "SELECT uid, fname, lname FROM abook";
// get result
ResultSet SQLResult = SQLStatement.executeQuery(Query);
 while(SQLResult.next())
 UId = SQLResult.getString("uid");
 FName = SQLResult.getString("fname");
 LName = SQLResult.getString("lname");
 out.println("<tr><td>" + UId + "</td><td>" + FName + "</td><td>" + LName
+ "</td></tr>");
// close connection
SQLResult.close();
SQLStatement.close();
Conn.close();
%>
</table>
</body>
</html>
Thank You,
Josh

<%@ page language="java"%>
<html>
<head>
<title>
First Bean
</title>
<%@ page import="java.sql.*" %>
</head>
<body>

<%!
Connection con;
Statement st;
ResultSet rs;
String userid;
String password;
%>
<%!public void db(JspWriter out)
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:phani");
catch(Exception e){}
try{
st=con.createStatement();
rs=st.executeQuery("SELECT * FROM login");
while(rs.next())
userid=rs.getString("userid");
password=rs.getString("password");
out.println(userid);
out.println("");
out.println(password);
 out.println("");
}catch(Exception e){}
try{
con.close();
}catch(Exception e){}
%>
<%db(out);%>

</body>
</html>
phani is dsn name
login is table name
Good luck
phani

RMI-Server "checks" when Client closes RMI-Connection

Hi there!
I hope somebody can help me...
I'm developing a client/server application where my client calls a remote method and my server starts working (i.e. 5-7 minutes batch processing).
Is there a way my server "gets informed", when RMI connection is closed (network failure, client closes)? In this situation the server should perform a rollback, delete generated files, etc.
I don't know if there is thrown a exception inside the server method, which I can catch ....
Any suggestion is welcome ..
Best Regards
Anton

Thanks a lot, I will have a look at the tutorial.
Initially my thoughts on this issue were:
-) The Client-RMI call is made in an own Thread (There are several things to do before job processing can start on the remote machine).
-) when the RMI call is processed, the thread gets blocked, so doesn't add load to the machine (hope so).
-) RMI does the "alive-checking", when network connection fails the client can mark the job as failed. The called server should also do some rollback. So I do not have to implements callback-listeners to react on server callbacks
-) But I'm worried about open connections, running out of socket resources and that there is no way to abort a endless running job.
This is my first aproach to solve this problem, I would be very glad about any comment ...

Help me understand JDBC connections using DataSource objects

I'm writing a simple Java server application that accepts connections from multiple clients via RMI, connects to a SQL Server 2000 database via Microsoft's SQL 2000 JDBC driver, gets some data, and returns it to the client. The server application will handle every SQL database connection. However, it must be able to establish multiple simultaneous connections, since multiple clients may connect at the same time and request data.
Sounds like a simple multi-threaded server that utilizes a connection pool for database connectivity, right? Well, if I want to do that, I have to register a PooledDataSource object with JNDI. My server threads that are handling requests will simply grab connections out of the pool to retrieve data (presumably).
This seems like a fairly simple server application; however, all the information and tutorials I've read on using DataSource objects for database connections rather than DriverManager.getConnection() mention XML config files, J2EE application servers, Tomcat, WebSphere, etc. I really don't want to have to deal with all that just to get connection pooling and not have to use the DriverManager.getConnection() method.
Is there a simple way to use DataSource objects without installing a lot of extra junk on my server?

Thanks, diazlara. Your response was exactly what I needed to know. All the information I've read prior to this suggested that I had to have a J2EE server running, and that I had to register the DataSource object with JNDI. If you ladies and gents could take a quick look at this and let me know if I'm doing it correctly, I'd appreciate it.
As proflux suggested, I wrote a connection manager:
import java.sql.*;
import javax.sql.*;
import com.microsoft.jdbcx.sqlserver.*;
public class SQLConnectionManager {
   private static ConnectionPoolDataSource connectionPool;
   // Initialize the connection manager
   public SQLConnectionManager() {
      init();
   // Retrieve a connection from the connection pool and return it
   public static Connection getConnection() {
      Connection connection = null;
      try {
         connection = connectionPool.getPooledConnection("myUsername", "myPassword").getConnection();
      catch (SQLException ex) {
         System.err.println("A problem occurred while getting a connection from the pool.");
         ex.printStackTrace();
      return connection;
   // Initialize the datasource and connection pool
   private static void init() {
      SQLServerDataSource mds = new SQLServerDataSource();
      mds.setDescription("MS SQLServerDataSource");
      mds.setServerName("127.0.0.1");
      mds.setPortNumber(1433);
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}As you can see, I'm hard-coding the username and password for testing purposes. I'll incorporate a login/authentication system for any production code that I use this in.
Once the SQLConnectionManager is created, connections can be retrieved as follows:
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         DatabaseMetaData metaData = connection.getMetaData();
         ResultSet rs = metaData.getCatalogs();
         while (rs.next()) {
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      catch (SQLException ex) {
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Thanks so much for all the helpful responses.

RMI Connection Refused through Firewall

Hi,
I am having problems making an RMI connection through a firewall. On the server outside the firewall I have my servlet application running in an OC4J container and inside the firewall I have an EJB listening on port 6666. I have setup the firewall to allow connections through on port 6666. If I telnet from the machine outside the firewall on port 6666 I am able to make a connection to the EJB. So I know the firewall has been setup to handle the connection.
I run the servlet application and when it tries to make the connection it gives an error:
javax.naming.NamingException: Lookup error: java.net.ConnectException: Connection refused; nested exception is:
java.net.ConnectException: Connection refused
When I do a snoop on the external machine to see what data is trying to be sent to the internal machine there is no data. When doing the telnet test there was data.
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Anyone able to help me see what I am missing?
Thanks
Shawn Clark

not sure what you mean by having a 'EJB listening' on port 6666. Do you mean actually having a socket listening within the EJB code? If so then that is a suspicious EJB activity.
If not then i guess you mean the ORMI listening port of the OC4J application. This is normally set on port 23791 to allow the RMI communication to flow.
-lp

Upon upgrading iPhoto, iPhoto Help no longer works. It gives the error message: "The selected topic is currently unavailable. To see all iPhoto Help, you must be connected to the Internet." Help!?

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I cannot scan anything at the moment despite the fact that I was able to do so several weeks ago. I went to the HP online support site and downloaded a scan doctor programme. It tells me that I do not have the proper scan software on my system and to download it from the HP website. It does't take me to the specific software I need but to a list of things I don't have so I downloaded all of this. I am half way through the setup process for one program and it is asking me to connect the printer/scanner to my computer using a usb cable so that "the settings of your wireless network can be communicated to the printer". I don't remember getting a usb cable with the printer but if I did I have no idea where it now is. What are the chances that finding this/buying this will actually solve my problem and is there a way to solve them without the cable? Any advise would be greatly appreciated.

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I noticed that your HP Deskjet 3520 is telling you to connect it to the computer with a USB cable. I am happy to help you with this connection issue!
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RnRMusicMan
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Help me in understand connect By Prior

Hi ,
please help me in understand connect By Prior
I did a sample example , but unale to follow , please explain
How did it understand that KING shuld be displaed first .
On wht basis the results are shown here ?
SELECT empno,
ename,
job,
mgr,
hiredate,
level
FROM   emp
START WITH mgr IS NULL
CONNECT BY PRIOR empno = mgr
7839     KING PRESIDENT      17-Nov-81     1
7566     JONES MANAGER 7839     2-Apr-81     2
7788     SCOTT ANALYST 7566     19-Apr-87     3
7876     ADAMS CLERK 7788     23-May-87     4
7902     FORD ANALYST 7566     3-Dec-81     3
7369     SMITH CLERK 7902     17-Dec-80     4
7698     BLAKE MANAGER 7839     1-May-81     2
7499     ALLEN SALESMAN 7698     20-Feb-81     3
7521     WARD SALESMAN 7698     22-Feb-81     3
7654     MARTIN SALESMAN 7698     28-Sep-81     3
7844     TURNER SALESMAN 7698     8-Sep-81     3
7900     JAMES CLERK 7698     3-Dec-81     3
7782     CLARK MANAGER 7839     9-Jun-81     2
7934     MILLER CLERK 7782     23-Jan-82     3

Hi,
user10503747 wrote:
Hi ,
please help me in understand connect By Prior
I did a sample example , but unale to follow , please explain
How did it understand that KING shuld be displaed first .
On wht basis the results are shown here ?In a CONNECT BY query (without an ORDER BY clause), if x is an ancestor of y (that is, if x is the parent of y, or x is the parent of the parent of y, and so on), then y will be displayed after x, but before any other row that does not have x as its ancestor. (That is also the order in which ROWNUM will be assigned. This applies only to the query in which CONNECT BY is done. If you use the results set as a sub-query, the super query may cause the results to be re-arranged. An ORDER BY clause always takes precedence.)
In a CONNECT BY query, every row in the result set either:
(a) satisfies the START WITH condition, or
(b) is a descendant of some row in (a); that is, some row that satifies the START WITH condition is its ancestor.
Since ancestors always come before their descendants, the first row in the result set must be a row that satisfied the START WITH condition. In your example, the row with ename='KING' was the only row that satisfied the condition "START WITH mgr IS NULL", and all the other rows are its descendants, so the row with ename='KING' must come first, as APC said.

Help on JSP-RMI connection

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