java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.lang/String;)Lorg/apache/log4j/Logger"

Issue

• Getting below error in EAP 6 :

java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.lang/String;)Lorg/apache/log4j/Logger;" the class loader (instance of org/jboss/modules/ModuleClassLoader) of the current class, org/apache/log4j/Logger, and the class loader (instance loader) for resolved class, org/apache/log4j/LogManager, have different Class objects for the type r; used in the signature

• We are invoking EJB Bean. As the response object, we punt com.example.dto.security.Password into com.example.dto.customer.CommunicationChannel as below:

CommunicationChannel commChannel = new CommunicationChannel();
Password password = new Password();
commChannel.setPasswordData(password);

we got strange exception as follows:

java.lang.LinkageError: loader constraint violation: loader (instance of org/jboss/modules/ModuleClassLoader) previously initiated loading for a different type with name "com/example/dto/security/Password"