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Remote Exception in EJB with MySQL

najmi thayyil
Posts: 4
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Hi all,
I am working on a class projectand am having a problem connecting between the J2EE Reference
Implementation Server and MySql. I have set-up the defualt.properties file for MySql

# JDBC Driver Examples:
# Oracle thin driver: oracle.jdbc.driver.OracleDriver
# Merant driver: intersolv.jdbc.sequelink.SequeLinkDriver
# Cloudscape driver: COM.cloudscape.core.RmiJdbcDriver
# MySQL driver: org.gjt.mm.mysql.Driver
# JDBC URL Examples:
# Oracle thin driver:
# jdbc racle:thin:@<host>:<port>:<sid>
# Cloudscape RMI driver:
# jdbc:cloudscape:rmi:<database>;create=true
# Merant driver:
# jdbc:sequelink://<host>:<port>/[SQLServer];Database=<database>
# MySQL driver:
# jdbc:mysql://<host>:<port>/<database>
Here is the code in a sample EJB for making a connection
* a logical database name to be used to access data
* this will be remove after we are able to use
* the connection manager.
private String dbName = "java:comp/env/jdbc/ThePackED";
* make a connection with the MySQL database via a Application Server
private void makeConnection() throws NamingException, SQLException {
InitialContext ic = new InitialContext();
DataSource ds = (DataSource)ic.lookup(dbName);
conn = ds.getConnection();
And here is the client information
public class GenerateDocumentListClient {
public static void main(String[] args) {
try {
Context initial = new InitialContext();
Object objref = initial.lookup("GenerateDocumentListBean");
GenerateDocumentListHome home = (GenerateDocumentListHome)PortableRemoteObject.narrow(objref,
GenerateDocumentList aGenerateDocumentList = home.create();
// write your test code here
System.out.println("aGenerateDocumentList = " + aGenerateDocumentList);
} catch (Exception ex) {
System.err.println("Caught an unexpected exception!");
Here is what the application tells me
// this is the value of aGenerateDocumentList after the home.create method call
aGenerateDocumentList =IOR:0000000000000034524d493a7265706f7274696e672e47656e6572617465446f63756d656e744c6973743a30303030303030303030303030303030000000000100000000000000de000101000000000e3139322e3136382 e312e3130320004de00000021afabcafe00000020b25dc41b000000020000000d0000000004000000040000000100000000000002000000010000001400000000000100200000000000010100000000000000001900000076000 000000000006e66696c653a2f633a2f6a3273646b6565312e322e312f7265706f7369746f72792f57323030302f6170706c69636174696f6e732f5265706f7274696e67436c69656e742e6a617220687474703a2f2f573230303 03a393139312f5265706f7274696e67436c69656e742e6a61720
when I try to execute the business method getProjectList I get this:
Caught an unexpected exception!
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.RemoteException: Unknown Exception/Error thrown by EJB method.; nested exception is:
java.rmi.RemoteException: Unknown Exception/Error thrown by EJB method.; nested exception is:
<<no stack trace available>>
If anyone could tell me whats wrong or give me an example or sample code for setting up the bean, client
I would greatly appreciate it!

Frank Carver
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