File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
The moose likes EJB and other Java EE Technologies and the fly likes Problem in bmp entity bean while running client? Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » EJB and other Java EE Technologies
Bookmark "Problem in bmp entity bean while running client?" Watch "Problem in bmp entity bean while running client?" New topic
Author

Problem in bmp entity bean while running client?

vikram veera
Ranch Hand

Joined: Dec 26, 2000
Posts: 43
Hai everyone,
I have a doubt in setting a envirnoment propery for bmp entity bean.Ie if i want to set the connectivity to the database through environment property it through exception when client run...
If i set the database connectvity with in the bean it works perfectly...
Please help me how to set environment property...
I am using weblogic server5.1 and database is oracle8...
See the program if i set the database connectvity with in the bean
it is okey..
the program is given below

import java.io.Serializable;
import java.rmi.*;
import javax.ejb.*;
import java.util.*;
import java.sql.*;
import javax.naming.*;
public class AccountBean implements EntityBean
{
protected EntityContext ctx;
public String accountID;
public String ownerName;
public double balance;

public AccountBean()
{
}
public void deposit(double amount)
{
balance += amount;
}
public void withdraw(double amount) throws AccountException
{
if(amount > balance)
{
throw new AccountException("Request to withdraw $" + amount +
" more than balance " +
balance +
" in account " + accountID);
}
balance -= amount;
// return balance;
}
public double getBalance()
{
return balance;
}

public String getAccountID()
{
return accountID;
}
public void setAccountID(String id)
{
this.accountID=id;
}

public String getOwnerName()
{
return ownerName;
}
public void setOwnerName(String name)
{
ownerName = name;
}
public void ejbActivate() throws RemoteException
{
}
public void ejbRemove() throws RemoteException
{
AccountPK pk =(AccountPK)ctx.getPrimaryKey();
String id = pk.accountID;
Connection con = null;
PreparedStatement ps = null;
try
{
con = getConnection();
ps= con.prepareStatement("delete from accounts where id = ?");
ps.setString(1,id);
int i = ps.executeUpdate();
if (i == 0)
{
throw new RemoteException ("Account ( "+pk+ " ) failed to
remove database");
}
}
catch (SQLException sqe) {
throw new RemoteException (sqe.getMessage());
}
finally
{
try
{
ps.close();
con.close();
}
catch (Exception e)
{
throw new RemoteException (e.getMessage());
}
}
}
public void ejbPassivate()
{
}
public void ejbLoad() throws RemoteException
{
AccountPK pk =(AccountPK)ctx.getPrimaryKey();
String id=pk.accountID;
Connection con = null;
PreparedStatement ps = null;
try
{
con = getConnection();
ps= con.prepareStatement("select ownerName,balance from accounts
where id = ?");
ps.setString(1,id);
ResultSet rs=ps.executeQuery();
rs.next();
ownerName = rs.getString("ownerName");
balance = rs.getDouble("balance");
}
catch (SQLException sqe)
{
throw new RemoteException ("Account"+pk+"failed to load from
database"+sqe);
}
finally
{
try
{
ps.close();
con.close();
}
catch (Exception e)
{
throw new RemoteException (e.getMessage());
}
}
}
public void ejbStore() throws RemoteException
{
Connection con = null;
PreparedStatement ps = null;
try
{
con = getConnection();
ps = con.prepareStatement("update accounts set ownerName =
?,balance = ? where id = ?");
ps.setString(1,ownerName);
ps.setDouble(2,balance);
ps.setString(3,accountID);
ps.executeUpdate();
}
catch (SQLException sqe)
{
throw new RemoteException ("Account"+accountID+"failed to load
from database"+sqe);
}
finally
{
try
{
ps.close();
con.close();
}
catch (Exception e)
{
throw new RemoteException (e.getMessage());
}
}
}
public void setEntityContext(EntityContext ctx) throws
RemoteException
{
this.ctx = ctx;
//env = ctx.getEnvironment();
}
public void unsetEntityContext() throws RemoteException
{
this.ctx = null;
//this.env = null;
}
public void ejbPostCreate(String accountId, String ownerName) throws
RemoteException
{
}
public AccountPK ejbCreate(String accountId, String ownerName) throws
CreateException, RemoteException
{
Connection con = null;
PreparedStatement ps = null;
try
{
this.accountID = accountId;
this.ownerName = ownerName;
this.balance=0;
con = getConnection();
ps = con.prepareStatement("insert into accounts
(ID,ownerName,balance) values(?,?,?)");
ps.setString(1, accountId);
ps.setString(2, ownerName);
ps.setDouble(3, balance);
ps.executeUpdate();
return new AccountPK(accountID);
}
catch (SQLException sqe) {
throw new CreateException (sqe.getMessage());
}
finally {
try {
ps.close();
con.close();
}
catch (Exception e) {
throw new RemoteException (e.getMessage());
}
}
}
public AccountPK ejbFindByPrimaryKey(AccountPK pk) throws
FinderException, RemoteException
{
Connection con = null;
PreparedStatement ps = null;
try
{
con=getConnection();
ps = con.prepareStatement("select id from accounts where id =
?");
ps.setString(1,pk.toString());
ResultSet rs = ps.executeQuery();
rs.next();
return pk;
}
catch (Exception e)
{
throw new FinderException(e.toString());
}
finally
{
try
{
ps.close();
con.close();
}
catch (Exception e)
{
throw new RemoteException (e.getMessage());
}
}
}
public Enumeration ejbFindByOwnerName(String Name) throws
FinderException, RemoteException
{
PreparedStatement ps = null;
Connection con = null;
Vector v = new Vector();
try
{
con=getConnection();
ps = con.prepareStatement("select id from accounts where
ownerName = ?");
ps.setString(1,Name);
ResultSet rs = ps.executeQuery();
while(rs.next())
{
String id = rs.getString("id");
v.addElement(new AccountPK(id));

}
return v.elements();
}
catch (Exception e)
{
throw new FinderException(e.toString());
}
finally
{
try
{
ps.close();
con.close();
}
catch (Exception e)
{
throw new RemoteException (e.getMessage());
}
}
}
//public static final String JDBC_URL="JDBC_URL";
public Connection getConnection() throws SQLException {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}catch(ClassNotFoundException ee) {}
//String jdbc_URL=(String)env.get(JDBC_URL);
return DriverManager.getConnection("jdbc dbc:sample","scott","tiger");
}
}
this works fine...
------------------------------------------------------------------
If i set this database connectvity through environment property it through exception...
The exception is throws when i run client...
But in deployment it gives no problem..
the program is given below..
import java.sql.*;
import javax.naming.*;
import javax.ejb.*;
import java.util.*;
import java.rmi.RemoteException;
public class AccountBean implements EntityBean {
protected EntityContext ctx;
// Bean-managed state fields
public String accountID;// PK
public String ownerName;
public double balance;
// Environment properties the bean was deployed with
public Properties env;
public AccountBean() {
System.out.println("New Bank Account Entity Bean Java
Object created by EJB Container.");
}
//
// Business Logic Methods
//
/**
* Deposits amt into account.
*/
public void deposit(double amt) throws AccountException {
System.out.println("deposit(" + amt + ") called.");

balance += amt;
}

public void withdraw(double amt) throws AccountException {
System.out.println("withdraw(" + amt + ") called.");
if (amt > balance) {
throw new AccountException("Your balance is " +
balance + "! You cannot withdraw " + amt + "!");
}
balance -= amt;
}
public double getBalance() {
System.out.println("getBalance() called.");
return balance;
}
public void setOwnerName(String name) {
System.out.println("setOwnerName() called.");
ownerName = name;
}

public String getOwnerName() {
System.out.println("getOwnerName() called.");
return ownerName;
}

public String getAccountID() {
System.out.println("getAccountID() called.");
return accountID;
}

public void setAccountID(String id) {
System.out.println("setAccountID() called.");
this.accountID = id;
}


public void ejbActivate() throws RemoteException {
System.out.println("ejbActivate() called.");
}

public void ejbRemove() throws RemoteException {
System.out.println("ejbRemove() called.");

AccountPK pk = (AccountPK) ctx.getPrimaryKey();
String id = pk.accountID;
PreparedStatement pstmt = null;
Connection conn = null;
try {

conn = getConnection();

pstmt = conn.prepareStatement("delete from
accounts where id = ?");
pstmt.setString(1, id);


if (pstmt.executeUpdate() == 0) {
throw new RemoteException("Account " +
pk + " failed to be removed from the database");
}
}
catch (SQLException ex) {
throw new RemoteException(ex.toString());
}
finally {
try {
if (pstmt != null) pstmt.close();
}
catch (Exception e) { }
try {
if (conn != null) conn.close();
}
catch (Exception e) { }
}
}

public void ejbPassivate() throws RemoteException {
System.out.println("ejbPassivate () called.");
}

public void ejbLoad() throws RemoteException {
System.out.println("ejbLoad() called.");

AccountPK pk = (AccountPK) ctx.getPrimaryKey();
String id = pk.accountID;
PreparedStatement pstmt = null;
Connection conn = null;
try {

conn = getConnection();

pstmt = conn.prepareStatement("select
ownerName, balance from accounts where id = ?");
pstmt.setString(1, id);
ResultSet rs = pstmt.executeQuery();
rs.next();
ownerName = rs.getString("ownerName");
balance = rs.getDouble("balance");
}
catch (SQLException ex) {
throw new RemoteException("Account " + pk + "
failed to load from database", ex);
}
finally {

try {
if (pstmt != null) pstmt.close();
}
catch (Exception e) { }
try {
if (conn != null) conn.close();
}
catch (Exception e) { }
}
}

public void ejbStore() throws RemoteException {
System.out.println("ejbStore() called.");
PreparedStatement pstmt = null;
Connection conn = null;
try {

conn = getConnection();

pstmt = conn.prepareStatement("update accounts
set ownerName = ?, balance = ? where id = ?");
pstmt.setString(1, ownerName);
pstmt.setDouble(2, balance);
pstmt.setString(3, accountID);
pstmt.executeUpdate();
}
catch (SQLException ex) {
throw new RemoteException("Account " +
accountID + " failed to save to database", ex);
}
finally {
try {
if (pstmt != null) pstmt.close();
}
catch (Exception e) { }
try {
if (conn != null) conn.close();
}
catch (Exception e) { }
}
}

public void setEntityContext(EntityContext ctx) throws
RemoteException {
System.out.println("setEntityContext called");
this.ctx = ctx;
env = ctx.getEnvironment();
}

public void unsetEntityContext() throws RemoteException {
System.out.println("unsetEntityContext called");
this.ctx = null;
this.env = null;
}
public void ejbPostCreate(String accountID, String ownerName)
throws RemoteException {
}

public AccountPK ejbCreate(String accountID, String ownerName)
throws CreateException, RemoteException {
PreparedStatement pstmt = null;
Connection conn = null;
try {
System.out.println("ejbCreate() called.");
this.accountID = accountID;
this.ownerName = ownerName;
this.balance = 0;

conn = getConnection();


pstmt = conn.prepareStatement("insert into accounts
(id, ownerName, balance) values (?, ?, ?)");
pstmt.setString(1, accountID);
pstmt.setString(2, ownerName);
pstmt.setDouble(3, balance);
pstmt.executeUpdate();

return new AccountPK(accountID);
}
catch (Exception e) {
throw new CreateException(e.toString());
}
finally {

try {
pstmt.close();
}
catch (Exception e) { }
try {
conn.close();
}
catch (Exception e) { }
}
}

public AccountPK ejbFindByPrimaryKey(AccountPK key) throws
FinderException, RemoteException {
PreparedStatement pstmt = null;
Connection conn = null;
try {
System.out.println("ejbFindByPrimaryKey(" + key + ")
called");

conn = getConnection();


pstmt = conn.prepareStatement("select id from accounts
where id = ?");
pstmt.setString(1, key.toString());
ResultSet rs = pstmt.executeQuery();
rs.next();


return key;
}
catch (Exception e) {
throw new FinderException(e.toString());
}
finally {

try {
pstmt.close();
}
catch (Exception e) { }
try {
conn.close();
}
catch (Exception e) { }
}
}

public Enumeration ejbFindByOwnerName(String name) throws
FinderException, RemoteException {
PreparedStatement pstmt = null;
Connection conn = null;
Vector v = new Vector();
try {
System.out.println("ejbFindByOwnerName(" + name + ")
called");


conn = getConnection();


pstmt = conn.prepareStatement("select id from accounts
where ownerName = ?");
pstmt.setString(1, name);
ResultSet rs = pstmt.executeQuery();
/*
* Insert every primary key found into a vector
*/
while (rs.next()) {
String id = rs.getString("id");
v.addElement(new AccountPK(id));
}

/*
* Return an enumeration of found primary keys
*/
return v.elements();
}
catch (Exception e) {
throw new FinderException(e.toString());
}
finally {
/*
* Release DB Connection for other beans
*/
try {
pstmt.close();
}
catch (Exception e) { }
try {
conn.close();
}
catch (Exception e) { }
}
}
public static final String JDBC_URL = "JDBC_URL";


public Connection getConnection() throws SQLException {
String jdbcURL = (String) env.get(JDBC_URL);



return DriverManager.getConnection(jdbcURL, env);
}

}

and the environment setting is
Environment property
setting value
-------------------- ----------------------------
jdbc.drivers"sun.jdbc.odbc.JdbcOdbcDriver"
JDBC_URL"jdbc dbc:sample"
It throws a exception like this...
javax.ejb.CreateException: java.lang.NullPointerException
at
weblogic.rmi.extensions.AbstractRequest.sendReceive(AbstractRequest.jav
a:76)
at
AccountBeanHomeImpl_WLStub.create(AccountBeanHomeImpl_WLStub.java:167)
at AccountBeanHomeImpl_ServiceStub.create(Compiled Code)
at Client.main(Client.java:22)
Please help me in this ...
Please send me the steps to solve it...
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Problem in bmp entity bean while running client?