Sven Templin wrote:
>
> 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.
>
You must make sure that either:
- Your bean is marked as Rentrant=False in the deployment descriptor
- You have set transaction attribute=Required for that method.
But may be you will have to try with the last jonas version (in CVS) because
a bug has been fixed recently about transaction isolations.
> 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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>
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