What is an EJB Context?
EJBContext is an interface that is implemented by the container, and it is also a part of the bean-container contract. Entity beans use a subclass of EJBContext called EntityContext. Session beans use a subclass...
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How can I call one EJB from inside of another EJB?
EJBs can be clients of other EJBs. It just works. Use JNDI to locate the Home Interface of the other bean, then acquire an instance reference, and so forth.
What is the difference between Message Driven Beans and Stateless Session beans?
In several ways, the dynamic creation and allocation of message-driven bean instances mimics the behavior of stateless session EJB instances, which exist only for the duration of a particular method call. However, message-driven beans...
What happens if remove( ) is never invoked on a session bean?
In case of a stateless session bean it may not matter if we call or not as in both cases nothing is done. The number of beans in cache is managed by the container....
What are the special design care that must be taken when you work with local interfaces?
It is important to understand that the calling semantics of local interfaces are different from those of remote interfaces. For example, remote interfaces pass parameters using call-by-value semantics, while local interfaces use call-by-reference. This...
Brief description about local interfaces
EJB was originally designed around remote invocation using the Java Remote Method Invocation (RMI) mechanism, and later extended to support to standard CORBA transport for these calls using RMI/IIOP. This design allowed for maximum...
What are the the new features in J2SE 7 or java 1.7 ?
Java SE 7 Download JDK 7 Java 7 (codename Dolphin) is a major update that was launched on July 7, 2011 and was made available for developers on July 28, 2011. The development period...
What are the the new features in J2SE 6 or java 6.
Java SE 6 Download JDK 6 Codename is Mustang. As of the version released on December 11, 2006, Sun replaced the name “J2SE” with Java SE and dropped the “.0” from the version number....
What are the the new features in J2SE 5 or java 1.5 ?
Java 5.0 New Features Autoboxing/Unboxing Enumerations Varargs Enhanced for loop Metadata-Annotations Java Generics Java 5.0 New Features Java 5.0 New features are listed in short here Autoboxing/Unboxing Enumerations – with ‘enum’ keyword Varargs –...
What does the “abstract” keyword mean in front of a method? A class?
A class containing abstract method is called Abstract class. An Abstract class can’t be instantiated. Example of Abstract class: abstract class testAbstractClass { protected String myString; public String getMyString() { return myString; } public...
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