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What is the difference between ejb2.0 and ejb3.0 and i reviewed in net that ejb 3.0 using POJO(plain old java objects) what is pojoi want the reply for this
Satish gupta
- Oct 29th, 2011
using ejb2 framework application provides the business layer logic's in distributive and secured manner but it is little bit heavy weighted and complex, so to reduce its complexity and to overcome the...
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Wait(), notify() and notyfyAll() methods
Why wait(), notify() and notyfyAll() methods are avialble in Object class but not in Thread class? Explain.
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Editorial / Best Answer
janswain- Member Since Sep-2008 | Sep 25th, 2008
Each object in java is associated with a lock and the wait and notify methods are not associated with a thread but with a lock, so?coupling locks and objects meant that each object should have wait and notify methods that operate on that objects lock.
Java provides a way to lock the code for a thread which is currently executing it using the synchorinized keyword, and making other threads that wish to use it wait until the first thread is finished.These other threads are placed in the waiting state .Once the first thread completes it task than it notifies others in the queue by giving the lock to JVM.Now JVM decides which thread will exceute next by its internal algo.Hence, the wait and notify methods has to be in Object class as it acquires lock and has to notify others.....tarunkgupta
- Sep 2nd, 2010
A thread having a lock on the shared object (by using synchronized constructs) can invoke these methods on that shared Object. It gives a hint to JVM scheduler to pick or block the next thread contend...
NovaCarolina
- May 12th, 2010
A lock is done on an object. It is an obect which is locked, hence these methods are characteristics of the object, hence defined in the Object class.
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What is EJB
opbehera
- Feb 8th, 2010
EJB is a distributed technology i.e capable of developing java based distributed applications, enterprise application & heavy weight business component giving the advantages of readyma...
sai.pappu
- Sep 26th, 2008
EJB is an server side component & its a WODA ( Write Once Deploy Any Where).EJB's run will under the control of EJB container.EJB is popular due to System level services provided by it.Developer can more concentrate on Business Logic due to services provided byu EJB.thanks.
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