Hello *,
I have the following problem:
System environment:
- Server: JOnAS 2.2.7 on Win NT 4.0 WS, SUN JDK 1.3
- Database: PostgreSQL on Linux
- Client: Running on the same server over RMI
I have a simple entity bean TestCounter with a primary key and an attribute
long count and one methode:
public long getNewCount() {
count++;
System.out.println("Counter " + new Long(count).toString())
return count;
}
The entity beans should generate a unique counter, which can be used as
object id.
On the client is a TestThreadClass:
public class TestThread extends Thread{
...
public void run() {
try {
javax.naming.InitialContext initialContext =
new javax.naming.InitialContext();
TestCounterPK counterPK = new TestCounterPK("1");
TestCounterHome counterHome = (TestCounterHome)
javax.rmi.PortableRemoteObject.narrow(
initialContext.lookup("TestCounterHome"),
TestCounterHome.class);
TestCounter testCounter = counterHome.findByPrimaryKey(counterPK);
long j = 0;
for(int i= 0; i<400; i++){
j = testCounter.getNewCount();
}
System.out.println("Last Counter " + new Long(j).toString());
}
catch(Exception eEx) {
eEx.printStackTrace();
}
}
...
}
On the client I'm starting four TestThreads:
...
TestThread thread1 = new TestThread();
TestThread thread2 = new TestThread();
TestThread thread3 = new TestThread();
TestThread thread4 = new TestThread();
thread1.start();
thread2.start();
thread3.start();
thread4.start();
...
This simple programm should generate 1600 numbers, but the result is:
Output on server:
...
Counter 100
Counter 100
Counter 100
Counter 101
Counter 102
Counter 102
Counter 102
...
Output on client:
...
Last Counter 823
Last Counter 825
Last Counter 827
Last Counter 828
...
With different threads on the same entity bean are returning the same
counter, but should returning unique, different counters.
Where is the problem? Using a transaction is not a solution, it brings the
same result.
One (good?) information: Running same application on Borland Application
Server 4.5 produces same result.
Thank's for a tip!
Sven
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