I have used Hibernate wrapped in a Session Bean under JBoss 3.2.5 and been using it successfully. However, I run into a problem, on the client side, when i call the same EJB from with a persistent class (POJO). I have narrowed it down to the fact that, i get the exception ONLY because of the presence of the narrow() statement in the Account (POJO) class. Why is that?
By the way, in case you are curious, I have made the Account class Serializable because I'm using Betwixt to print out the object contents in XML form for readability and debugging.
Following is the code of interest:
Code:
Account Session Bean: -----------------------------------------------
public class AccountDAOSessionBean implements SessionBean {
protected Session hibernate;
...
public Account find(long number) throws EJBException {
log.debug("find(" + number + ")");
try {
if (!hibernate.isConnected())
hibernate.reconnect();
Query query = hibernate.getNamedQuery(Account.class.getName()
+ ".findByNumber");
query.setLong("number", number);
query.setBoolean("online", true);
query.setBoolean("deleted", false);
List list = query.list();
if (list.isEmpty())
throw new Exception("account " + number + " not found");
return (Account) list.get(0);
} catch (Exception e) {
log.warn("could not find account " + number, e);
throw new EJBException("could not find account " + number, e);
} finally {
try {
hibernate.disconnect();
} catch (Exception e) {
log.warn("error closing hibernate session", e);
}
}
}
public List findChildren(Account account) throws EJBException {
log.debug("getChildren(" + account.toShortString() + ")");
try {
if (!hibernate.isConnected())
hibernate.reconnect();
Query query = hibernate.getNamedQuery(Account.class.getName()
+ ".findChildren");
query.setProperties(account);
return query.list();
} catch (Exception e) {
throw new EJBException("error getting children for account " + this, e);
} finally {
try {
hibernate.disconnect();
} catch (Exception e) {
log.warn("error closing hibernate session", e);
}
}
}
...
}
Account POJO: ---------------------------------------------------------
public class Account implements Serializable {
...
public List getChildren() {
try {
Object obj = new InitialContext().lookup("AccountDAO");
AccountDAOHome accountDAOHome = (AccountDAOHome) PortableRemoteObject
.narrow(obj, AccountDAOHome.class);
// return accountDAOHome.create().findChildren(this);
} catch (Throwable e) {
}
return null;
}
...
}
Client's main() method: ------------------------------------------------
153 public static void main(String[] args) throws Exception {
154 Context context = new InitialContext();
155 Object obj = context.lookup("AccountDAO");
156 AccountDAOHome accountDAOHome = (AccountDAOHome) PortableRemoteObject
157 .narrow(obj, AccountDAOHome.class);
158 AccountDAO accountDAO = accountDAOHome.create();
159 Account account = accountDAO.find(1517);
160 log.info(account);
161 }
Exception Thrown within client: -----------------------------------------
java.lang.reflect.UndeclaredThrowableException
at $Proxy1.find(Unknown Source)
at com.unisource.ec.ejb.account.AccountDAOSessionBean.main(AccountDAOSessionBean.java:159)
Caused by: java.io.InvalidClassException: com.unisource.ec.schema.account.Account; local class incompatible: stream classdesc serialVersionUID = 5464614373768493396, local class serialVersionUID = 7044260632390500770
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:463)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1521)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1521)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
at java.rmi.MarshalledObject.get(MarshalledObject.java:135)
at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:136)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:96)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:53)
at org.jboss.proxy.ejb.StatefulSessionInterceptor.invoke(StatefulSessionInterceptor.java:104)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:85)
... 2 more
Exception in thread "main"
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