I use the ejb-ql SELECT OBJECT(O)    FROM t As O WHERE O.id = (SELECT MAX(C.id) FROM t AS C ) in ejb-jar. It runs well in Weblogic, while throws exception when migrated to Jboss-5.1.0.GA. Can't  Jboss-5.1.0.GA support nested select?  Following is the exception.

org.jboss.deployment.DeploymentException: Error compiling EJB-QL statement for EJB 'T': SELECT OBJECT(O)    FROM t As O WHERE O.id = (SELECT 1 FROM t AS C )
    at org.jboss.ejb.plugins.cmp.jdbc.JDBCEJBQLQuery.<init>(JDBCEJBQLQuery.java:67)
    at org.jboss.ejb.plugins.cmp.jdbc.JDBCCommandFactory.createEJBQLQuery(JDBCCommandFactory.java:75)
    at org.jboss.ejb.plugins.cmp.jdbc.JDBCQueryManager.start(JDBCQueryManager.java:286)
    at org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.startStoreManager(JDBCStoreManager.java:505)
    at org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.start(JDBCStoreManager.java:396)
    at org.jboss.ejb.plugins.CMPPersistenceManager.start(CMPPersistenceManager.java:172)
    at org.jboss.ejb.EjbModule.startService(EjbModule.java:495)
    at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:376)
    at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:322)
    at sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
    at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
    at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
    at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
    at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
    at org.jboss.system.microcontainer.ServiceProxy.invoke(ServiceProxy.java:189)
    at $Proxy38.start(Unknown Source)
    at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:42)
    at org.jboss.system.microcontainer.StartStopLifecycleAction.installAction(StartStopLifecycleAction.java:37)
    at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62)
    at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71)
    at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51)
    at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
    at org.jboss.system.microcontainer.ServiceControllerContext.install(ServiceControllerContext.java:286)
    at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631)
    at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934)
    at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082)
    at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984)
    at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822)
    at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553)
    at org.jboss.system.ServiceController.doChange(ServiceController.java:688)
    at org.jboss.system.ServiceController.start(ServiceController.java:460)
    at org.jboss.system.deployers.ServiceDeployer.start(ServiceDeployer.java:163)
    at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:99)
    at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:46)
    at org.jboss.deployers.spi.deployer.helpers.AbstractSimpleRealDeployer.internalDeploy(AbstractSimpleRealDeployer.java:62)
    at org.jboss.deployers.spi.deployer.helpers.AbstractRealDeployer.deploy(AbstractRealDeployer.java:50)
    at org.jboss.deployers.plugins.deployers.DeployerWrapper.deploy(DeployerWrapper.java:171)
    at org.jboss.deployers.plugins.deployers.DeployersImpl.doDeploy(DeployersImpl.java:1439)
    at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1157)
    at org.jboss.deployers.plugins.deployers.DeployersImpl.doInstallParentFirst(DeployersImpl.java:1178)
    at org.jboss.deployers.plugins.deployers.DeployersImpl.install(DeployersImpl.java:1098)
    at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348)
    at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631)
    at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934)
    at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:1082)
    at org.jboss.dependency.plugins.AbstractController.resolveContexts(AbstractController.java:984)
    at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:822)
    at org.jboss.dependency.plugins.AbstractController.change(AbstractController.java:553)
    at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:781)
    at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:702)
    at org.jboss.system.server.profileservice.repository.MainDeployerAdapter.process(MainDeployerAdapter.java:117)
    at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:362)
    at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:255)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:181)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:205)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)
Caused by: org.jboss.ejb.plugins.cmp.ejbql.ParseException: Encountered "SELECT" at line 1, column 65.
Was expecting one of:
    "ABS" ...
    "LENGTH" ...
    "LOCATE" ...
    "SQRT" ...
    "MOD" ...
    "(" ...
    "+" ...
    "-" ...
    <INTEGER_LITERAL> ...
    <FLOATING_POINT_LITERAL> ...
    <NUMERIC_VALUED_PARAMETER> ...
    <NUMERIC_VALUED_PATH> ...
   
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.generateParseException(EJBQLParser.java:4366)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.jj_consume_token(EJBQLParser.java:4243)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ArithmeticPrimary(EJBQLParser.java:1831)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ArithmeticFactor(EJBQLParser.java:1760)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ArithmeticTerm(EJBQLParser.java:1684)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ArithmeticExpression(EJBQLParser.java:1630)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ArithmeticPrimary(EJBQLParser.java:1797)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ArithmeticFactor(EJBQLParser.java:1760)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ArithmeticTerm(EJBQLParser.java:1684)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ArithmeticExpression(EJBQLParser.java:1630)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ScalarExpression(EJBQLParser.java:1622)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.SingleValueDesignator(EJBQLParser.java:1618)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ComparisonExpression(EJBQLParser.java:1553)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.SimpleCondExpression(EJBQLParser.java:924)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ConditionalPrimary(EJBQLParser.java:881)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ConditionalTest(EJBQLParser.java:849)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.ConditionalFactor(EJBQLParser.java:826)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.WhereConditionalTerm(EJBQLParser.java:673)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.WhereExpression(EJBQLParser.java:628)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.WhereClause(EJBQLParser.java:592)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.EJBQL(EJBQLParser.java:176)
    at org.jboss.ejb.plugins.cmp.ejbql.EJBQLParser.parse(EJBQLParser.java:65)
    at org.jboss.ejb.plugins.cmp.jdbc.JDBCEJBQLCompiler.compileEJBQL(JDBCEJBQLCompiler.java:168)
    at org.jboss.ejb.plugins.cmp.jdbc.JDBCEJBQLQuery.<init>(JDBCEJBQLQuery.java:58)
    ... 64 more