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Collections:There are inbuilt class for different data structures available in java . They are classified into 3 List ,Set and Map . A list can have duplicate values whereas a Set cannot have duplicate values. A Map is used to store data in form of key and value.A Map does not allow duplicate keys but allows duplicate values.

Dequeue

failed to lazily initialize a collection of role:

id to load is required for loading

id to load is required for loading  is a common error you may face while runtime .
I have faced this error while a bean call . A session bean of type entity is interacting with  JPA project  This can come due to several reasons based on your project .Some of them are as below:
If you invoke find method by passing null as primary key hibernate will throw the following exception to you .
If it is not set you might face the following exception .
Caused by: java.lang.IllegalArgumentException: id to load is required for loading
at org.hibernate.event.spi.LoadEvent.<init>(LoadEvent.java:87) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.event.spi.LoadEvent.<init>(LoadEvent.java:59) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2479) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.internal.SessionImpl.get(SessionImpl.java:994) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:807) [hibernate-entitymanager-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:781) [hibernate-entitymanager-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.jboss.as.jpa.container.AbstractEntityManager.find(AbstractEntityManager.java:193) [jboss-as-jpa-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.project.banking.AccountBean.findAccount(AccountBean.java:42) [Bean2.jar:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.7.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.7.0_51]
at java.lang.reflect.Method.invoke(Unknown Source) [rt.jar:1.7.0_51]
at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptorFactory.java:72) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:58) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:58) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.jpa.interceptor.SBInvocationInterceptor.processInvocation(SBInvocationInterceptor.java:47) [jboss-as-jpa-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:272) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]

org.hibernate.MappingException: Unknown entity:

Hi Guys ,

org.hibernate.MappingException: Unknown entity:  is a common error you may face while runtime .
I have faced this error while a bean call . A session bean of type entity . This can come due to several reasons based on your project .Some of them are as below:
1.In your persistence.xml you need to dd that particular class like as below :
            <class>model.Account</class>

If it is not set you might face the following exception .
01:09:51,133 ERROR [org.jboss.as.ejb3.invocation] (http-localhost/127.0.0.1:8088-2) JBAS014134: EJB Invocation failed on component AccountBean for method public abstract model.Account org.project.banking.AccountRemote.findAccount(model.Account): javax.ejb.EJBException: java.lang.IllegalArgumentException: Unknown entity: model.Account
at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:189) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:274) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:339) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:238) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.remote.EJBRemoteTransactionPropagatingInterceptor.processInvocation(EJBRemoteTransactionPropagatingInterceptor.java:79) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:55) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:165) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.as.ejb3.remote.LocalEjbReceiver.processInvocation(LocalEjbReceiver.java:249) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:181) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBObjectInterceptor.handleInvocation(EJBObjectInterceptor.java:58) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:183) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBHomeInterceptor.handleInvocation(EJBHomeInterceptor.java:83) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:183) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.TransactionInterceptor.handleInvocation(TransactionInterceptor.java:42) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:183) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.ReceiverInterceptor.handleInvocation(ReceiverInterceptor.java:125) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBClientInvocationContext.sendRequest(EJBClientInvocationContext.java:183) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBInvocationHandler.sendRequestWithPossibleRetries(EJBInvocationHandler.java:253) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:198) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBInvocationHandler.doInvoke(EJBInvocationHandler.java:181) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at org.jboss.ejb.client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:144) [jboss-ejb-client-1.0.24.Final-redhat-1.jar:1.0.24.Final-redhat-1]
at com.sun.proxy.$Proxy25.findAccount(Unknown Source)
at org.project.banking.Banking.getAllAccounts(Banking.java:32) [ConsultingJava.jar:]
at org.project.banking.Banking.processRequest(Banking.java:45) [ConsultingJava.jar:]
at org.project.common.router.CommonRouter.commonRoute(CommonRouter.java:63) [ConsultingJava.jar:]
at org.project.common.router.CommonRouter.route(CommonRouter.java:21) [ConsultingJava.jar:]
at org.project.common.web.CommonController.doPost(CommonController.java:69) [ConsultingJava.jar:]
at org.project.common.web.CommonController.doGet(CommonController.java:51) [ConsultingJava.jar:]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:734) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-1.jar:1.0.2.Final-redhat-1]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-1.jar:1.0.2.Final-redhat-1]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149)
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:920)
at java.lang.Thread.run(Unknown Source) [rt.jar:1.7.0_51]
Caused by: java.lang.IllegalArgumentException: Unknown entity: model.Account
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:829) [hibernate-entitymanager-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:781) [hibernate-entitymanager-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.jboss.as.jpa.container.AbstractEntityManager.find(AbstractEntityManager.java:193) [jboss-as-jpa-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.project.banking.AccountBean.findAccount(AccountBean.java:42) [Bean2.jar:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.7.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) [rt.jar:1.7.0_51]
at java.lang.reflect.Method.invoke(Unknown Source) [rt.jar:1.7.0_51]
at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptorFactory.java:72) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:58) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:58) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.jpa.interceptor.SBInvocationInterceptor.processInvocation(SBInvocationInterceptor.java:47) [jboss-as-jpa-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53) [jboss-as-ee-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.2.Final-redhat-1.jar:1.1.2.Final-redhat-1]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:272) [jboss-as-ejb3-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]

... 57 more

at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1143) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.internal.SessionImpl.locateEntityPersister(SessionImpl.java:2493) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.internal.SessionImpl.access$1900(SessionImpl.java:175) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2435) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2439) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2426) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.internal.SessionImpl.byId(SessionImpl.java:1071) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.internal.SessionImpl.get(SessionImpl.java:994) [hibernate-core-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:807) [hibernate-entitymanager-4.2.7.SP1-redhat-3.jar:4.2.7.SP1-redhat-3]
... 84 more

'hibernate.dialect' not set

Hi Guys ,

'hibernate.dialect' not set  is a common error you may face while deploying your EAR . This can come due to several reasons based on your project .

Check the below stack trace ..
To find the root cause you need to check the following :
1. make sure your bean's persistance.xml is having the following entry :
             <persistence-unit name="your unit name" transaction-type="JTA">
2. make sure your jpa project's is having the same entry .
              <persistence-unit name="your unit name" transaction-type="JTA">
3. make sure your bean is using the same unit name .
            @PersistenceContext(unitName = "ConsultingJPA")

If it is not set you might face the following exception .

Caused by: org.hibernate.HibernateException: Connection cannot be null when 'hibernate.dialect' not set
at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:98)
at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:68)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:174)
at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:76)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:160)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:132)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1822)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1780)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)
... 9 more

Jboss naming context factory and url

You might get following error while initial testing of your project

02:52:52,174 INFO  [stdout] (http-localhost/127.0.0.1:8088-1) INFO : CommonServlet do post

02:52:52,185 ERROR [stderr] (http-localhost/127.0.0.1:8088-1) javax.naming.NamingException: JBAS011843: Failed instantiate InitialContextFactory org.jnp.interfaces.NamingContextFactory from classloader ModuleClassLoader for Module "deployment.Consulting.war:main" from Service Module Loader

02:52:52,185 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at org.jboss.as.naming.InitialContextFactoryBuilder.createInitialContextFactory(InitialContextFactoryBuilder.java:64)

02:52:52,185 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)

02:52:52,186 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)

02:52:52,186 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at javax.naming.InitialContext.init(Unknown Source)

02:52:52,186 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at javax.naming.InitialContext.<init>(Unknown Source)

02:52:52,186 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at org.framework.naming.NamingWrapper.doLookUp(NamingWrapper.java:24)


Possible solution of this problem is changing the entry in
"org.jboss.naming.remote.client.InitialContextFactory".
"remote://localhost:4447"

but still it will fail :



03:32:57,376 ERROR [stderr] (http-localhost/127.0.0.1:8088-1) javax.naming.NamingException: JBAS011843: Failed instantiate InitialContextFactory org.jboss.naming.remote.client.InitialContextFactory from classloader ModuleClassLoader for Module "deployment.Consulting.war:main" from Service Module Loader

03:32:57,376 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at org.jboss.as.naming.InitialContextFactoryBuilder.createInitialContextFactory(InitialContextFactoryBuilder.java:64)

03:32:57,377 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)

03:32:57,377 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)

03:32:57,377 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at javax.naming.InitialContext.init(Unknown Source)

03:32:57,377 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at javax.naming.InitialContext.<init>(Unknown Source)


Fed up....
Now remove the entry and create initail context with any hashtable .

You might possible get the following error

03:58:25,999 ERROR [stderr] (http-localhost/127.0.0.1:8088-1) javax.naming.NameNotFoundException: consultingDS -- service jboss.naming.context.java.consultingDS

03:58:26,000 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at org.jboss.as.naming.ServiceBasedNamingStore.lookup(ServiceBasedNamingStore.java:103)

03:58:26,000 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:197)

03:58:26,000 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at org.jboss.as.naming.InitialContext.lookup(InitialContext.java:120)

03:58:26,001 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:183)

03:58:26,001 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:179)

03:58:26,001 ERROR [stderr] (http-localhost/127.0.0.1:8088-1)  at javax.naming.InitialContext.lookup(Unknown Source)


org.jboss.as.naming.ServiceBasedNamingStore.lookup(ServiceBasedNamingStore.java:103)


Then you have to make sure that your standalone.xml and domain.xmlis updated with the datasource and driver

If you have updated domain.xml and still the same exception as above the you have to update standalone.xml
while starting server might throw the following exception :


04:04:41,444 INFO  [org.jboss.as.controller] (Controller Boot Thread) JBAS014774: Service status report
JBAS014775:    New missing/unsatisfied dependencies:
      service jboss.jdbc-driver.oracle (missing) dependents: [service jboss.driver-demander.java:/consultingDS, service jboss.data-source.java:/consultingDS]

04:04:41,564 INFO  [org.jboss.as] (Controller Boot Thread) JBAS015961: Http management interface listening on http://127.0.0.1:9990/management

JBOSS AS 7 JMS

Hi Guys ,

I am going to set up Jboss AS 7 using Eclipse Kepler .

First of all you need to downlaod Jboss Developer Studios for Eclipse Kepler .

You need to create a server and all that basic steps that everyone knows .

If you are using JBOSS AS 7 for the first time and if you are an overconfident JBOSS 5 user , then be prepared you might face some difficulties .

Eclipse , by default will set up Program argument for server as

-mp "D:/software/jboss-eap-6.2.0/jboss-eap-6.2/modules" -logmodule org.jboss.logmanager -jaxpmodule javax.xml.jaxp-provider org.jboss.as.standalone -b localhost -c standalone.xml

You need to change it to

-mp "D:/software/jboss-eap-6.2.0/jboss-eap-6.2/modules" -logmodule org.jboss.logmanager -jaxpmodule javax.xml.jaxp-provider org.jboss.as.standalone -b localhost -c standalone-full.xml

Remember you can start JBOSS using standalone.xml also but messaging will not be visible and hornetq server for messaging will not be started .