on 06-28-2008 2:06 PM
Hello, experts,
I get a NullPointerException when I call method "save" and "view" from an EJB.
Please help me!Here is my code :
package com.sap.examples.telbookentry;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import javax.ejb.CreateException;
import javax.ejb.FinderException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import com.sap.engine.examples.util.TelBookException;
import com.sap.engine.examples.util.TelBookModel;
/**
@ejbHome <{com.sap.examples.telbookentry.TelBookEntryProcessorHome}>
@ejbLocal <{com.sap.examples.telbookentry.TelBookEntryProcessorLocal}>
@ejbLocalHome <{com.sap.examples.telbookentry.TelBookEntryProcessorLocalHome}>
@ejbRemote <{com.sap.examples.telbookentry.TelBookEntryProcessor}>
@stateless
@transactionType Container
*/
public class TelBookEntryProcessorBean implements SessionBean {
private TelBookEntryLocalHome entryHome;
public void ejbRemove() {
}
public void ejbActivate() {
}
public void ejbPassivate() {
}
public void setSessionContext(SessionContext context) {
myContext = context;
}
private SessionContext myContext;
/**
Business Method.
*/
public TelBookModel save(String name, String telnumber) throws TelBookException {
TelBookEntryLocal entry = null;
java.lang.String Id = generateId();
try {
entry =
entryHome.create(
Id, name, telnumber
);
} catch (CreateException e) {
e.printStackTrace();
throw new TelBookException(e.getMessage());
}
return getTelBookModel(entry);
}
/**
Business Method.
*/
public TelBookModel delete(String name, String telnumber) {
// TODO : Implement
return null;
}
/**
Business Method.
*/
public TelBookModel[] view() throws TelBookException {
ArrayList entries = new ArrayList();
try {
Collection present = entryHome.findMethod();
for (Iterator iterator = present.iterator(); iterator.hasNext();) {
entries.add(
getTelBookModel((TelBookEntryLocal) iterator.next()));
}
} catch (FinderException e) {
e.printStackTrace();
throw new TelBookException(e.getMessage());
}
TelBookModel[] result = new TelBookModel[entries.size()];
entries.toArray(result);
return result;
}
/**
Business Method.
*/
public TelBookModel change() {
// TODO : Implement
return null;
}
/**
Create Method.
*/
public void ejbCreate() throws CreateException {
try {
Context ctx = new InitialContext();
entryHome =
(TelBookEntryLocalHome) ctx.lookup(
"java:comp/env/TelBookEntry/TelBookEntryBean");
} catch (NamingException e) {
throw new CreateException(e.getMessage());
}
}
private String generateId() {
Date temp = new Date();
String stemp = String.valueOf(temp.hashCode());
if (stemp.length() < 10)
return stemp.substring(1, stemp.length());
else
return stemp.substring(1, 9);
}
private TelBookModel getTelBookModel(TelBookEntryLocal entry) {
TelBookModel data = new TelBookModel();
data.setId(entry.getId());
data.setName(entry.getName());
data.setTelnumber(entry.getTelnumber());
return data;
}
/**
Business Method.
*/
}
}
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