Stateless Session Bean pool MaximumSize with strictMaximumSi

[ashley_betts70]

Hi all,
I'm trying to restrict the number of active stateless session beans to 1 for a particular bean with no success. I've seen some of the comments/suggestions on other forums and have applied these but it still doesn't seem to recognise MaximumSize enforced with strictMaximumSize. The version of Jboss I'm currently using is 4.2.3.

jboss.xml:

<!DOCTYPE jboss PUBLIC
"-//JBoss//DTD JBOSS 4.2//EN"
"http://www.jboss.org/j2ee/dtd/jboss_4_2.dtd">

<enterprise-beans>

<ejb-name>coupledSeqResource</ejb-name>
<jndi-name>coupledSeqResource</jndi-name>
<configuration-name>SequentialRequires</configuration-name>

</enterprise-beans>
<container-configurations>
<container-configuration extends="Standard Stateless SessionBean">
<container-name>SequentialRequires</container-name>
<container-pool-conf>
1
true
</container-pool-conf>
</container-configuration>
</container-configurations>


(for some reason the post seems to remove the tags MaximumSize and strictMaximumSize but they are there wrapping the values in container-pool-conf)

When I check jmx-console it seems to show a maximum of 30 (and 2 as its current size after a couple of test executions):

Name Type Access Value Description
Name java.lang.String R StatelessDelegateWrapper MBean Attribute.
StateString java.lang.String R Started MBean Attribute.
CreateCount int R 2 MBean Attribute.
State int R 3 MBean Attribute.
InvokeStats org.jboss.ejb3.statistics.InvocationStatistics R MBean Attribute.
CurrentSize int R 2 MBean Attribute.
RemoveCount int R 0 MBean Attribute.
MaxSize int R 30 MBean Attribute.
AvailableCount int R 30 MBean Attribute.

standardjboss.xml hasn't been modified from the standard release.

Anyone have any suggestions to why this isn't working for me?

Regards,

Ashley

[rmurugs]

in jboss.xml , add this and try out.


<ejb-name>ejbName</ejb-name>
<pool-config>
<pool-class>org.jboss.ejb3.StrictMaxPool</pool-class>
<pool-max-size>5</pool-max-size>
<pool-timeout>60000</pool-timeout>
</pool-config>

[ashley_betts70]

Thanks for the response rmurugs.

Unfortunately what you've suggested doesn't comply with the dtd: http://www.jboss.org/j2ee/dtd/jboss_4_2.dtd and won't build.

Is there any other way I can enforce StrictMaxPool?

[shreyasshinde]

For EJB 3.0 you can edit the ejb3-interceptors-aop.xml file under /jboss_home/server/all/deploy directory. Edit the element for "Stateless Bean" with something like this
@org.jboss.annotation.ejb.PoolClass (value=org.jboss.ejb3.StrictMaxPool.class, maxSize=1, timeout=10000)


I hope this helps.

Thanks,

[sandeepk]

With StrictMaxPool class and maxSize 1 it blocks all the EJB calls and only allow one call. Is there a way to instance only one Object and not blocking? Like SingleTon bean. I am chasing a problem where too many EJB stateless bean are created. When I configure only one EJB call at a time which make system suffer for throughput.
I want to create only one instance but the call shouldn't be blocked. Multiple threads should be able to access the ejb stateless pool. Let me know what are my options.

[aravindsk]

     i am not sure this is the right place for my question.

i am currently using 6.0 CR1 and implementing coding using ejb3.1

@Startup

@Singleton

@Startup

@Singleton

public class StartupBean {

String item = "";

@Resource

TimerService timerService;

@EJB

SLSBean sBean;

     @PostConstruct

public void init() {

timerService.createTimer(1 * 60 * 1000, 1*60* 1000, item);

}

@Timeout

public void process(javax.ejb.Timer timer) {

try {

sBean.process(timer);

} catch (Exception e) {

e.printStackTrace();

}

}

}

@Stateless

public class SLSBean {

@Inject

private Logger logger;

@Asynchronous

public void process(javax.ejb.Timer timer) {}

}

my question is when it is always shows only one instace of SLSBean is created when i expected multiple slsb's

config:

Available Count 1

Create Count 1

Current Count 1

Max Size 1 The maximum number of instances that are  allowed to be pooled

ejb3-interceptors-aop.xml shows max size of  30.

      <annotation expr="class(*) AND !class(@org.jboss.ejb3.annotation.Pool)">
          @org.jboss.ejb3.annotation.Pool (value="ThreadlocalPool", maxSize=30, timeout=10000)
       </annotation>

what is that i need to change so that multiple slsbs created and pooled.

[jaikiran]

Aravind, please continue this discussion in your other thread here http://community.jboss.org/message/572349#572349