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What is the difference between EAR, JAR and WAR file
Answered by Jey on 2005-05-08 11:23:41: In J2EE application modules are packaged as EAR, JAR and WAR based on their functionality JAR: EJB modules which contains enterprise java beans class files and EJB deployment descriptor are packed as JAR files with .jar extenstion WAR Web modules which contains Servlet class files,JSP FIles,supporting files, GIF and HTML files are packaged...
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JMS Queue Connection
How to make the connection to JMS queue using EJB 3.0, Weblogic 10.3
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How do you establish a connection between two ear files
Sandhya.Kishan
- Jun 22nd, 2012
The Connection Pool Manager is used to establish a connection between two ear files.
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Heavy Weight and Light Weight
Why is ejb2.x considered as heavy weight and ejb3.0 is considered as light weight?What you mean by heavy/light weight? How it affects the performance of server?
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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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Need of EJB
What is the need of EJB?
Satish gupta
- Oct 29th, 2011
a business application consist of different-different layers like 1) User Interface development 2) Business logics development 3)database operation development EJB is used for Business logics develo...
Abhishek
- Oct 13th, 2011
EJB : It provides another layer where the platform's logic is stored. an EJB server provides functions such as Threading , concurrency , security and memory that(all of them ) is not provided by other container like tomcat so we need a EJB container.
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Web Module
What are the contents of a web module?
Satish gupta
- Oct 29th, 2011
A small unit of a web resource which can be deploy, can be used in our application is a web module.
for our banking or any other business application J2EE platform is a web module. -
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What is the difference between CMP and BMP
Answered by Jey on 2005-05-08 11:32:16: CMP means Container Managed Persistence. When we write CMP bean , we dont need to write any JDBC code to connect to Database. The container will take care of connection our enitty beans fields with database. The Container manages the persistence of the bean. Absolutely no database access code is written inside the bean class. BMP means Bean Managed Persistence....
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What is the difference between normal Java object and EJB
srinivask82
- Jun 11th, 2008
An EJB object is also an java object, but as it follows the EJB Specifications, it can be remotely identified in an Application server. An java object can be deployed in an application server, but can...
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What are webservices?
shahbazhafeez
- Apr 18th, 2011
Remotely hosted scalable/distributed applications/services (which process and/or store/retrieve data) such that the client does not need to execute locally on a single machine.
coolguy_krkr
- May 11th, 2008
Webservices are typically any services that can be published over the internet or on a wide range of networks so that the functionality is available to a wider audience..There is a slight differe...
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Can I invoke Runtime.gc() in an EJB
Answer posted by Mohan on 2005-05-21 19:26:48: No
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What is the difference between JavaBean and EJB
Answer posted by Mohan on 2005-05-20 08:40:04: Java Beans is intra-process component where as EJB is an Inter-Process component JavaBeans is particularly well-suited for asynchronous, intra-application communications among software
sai.pappu
- Sep 12th, 2008
JavaBean :1. Low-level approach for developing re-usable components for building different Java applications (Applets, stand-alone applications etc.).2. Java Beans runs in a JVM, just like other norma...
Guest
- Dec 14th, 2005
JavaBeans- are reuseable,non-deployable components. They can't exist independently.EJB - are deployable, reuesable, server side components. They can exist independently or in integration with other components.
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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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How to call ejbs from jsp?
bassem.aly
- Jun 2nd, 2010
You have two option.If the EJB is local (in the same EAR) you will use @EJBIf the EJB outside ear you will lookup in Application server context.
Rizwan
- Feb 7th, 2007
First approach is also correct. But in that approach you have use narrow method whereas in this case you dont need it. By using this approach also we can call EJB from a jsp initalContext ic=...
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1. How do J2EE application servers in general and the Weblogic servers in particular help software development? 2. What are EJBs? What are factors to determine which type of the EJBs to use? Give an example for each type you built recently in the projects you worked with and your reason of using that? 3. Describe how transactions are handled in EJBs. What happens to an EJB if an Exception is not caught? 4. Describe different ways of deploying EJBs to the Weblogic servers. Describe the necessary steps of deploying EJBs to the Weblogic servers for each of the methods identified above. What are the key parameters needed for the deployments?5. What are the steps to build WebServices for Weblogic application servers? Describe the necessary steps of deploying WebServices to the Weblogic servers.6. What are commonly used types of JMS subscribers? What are the steps to build the types of the JMS subscribers mentioned before? What happens if an Exception is not caught in the subscribers? 7. What is the proper way to ensure the messages are processed in order if messages are ordered entering a JMS queue? 8. What are the message selectors and how are they used?9. What will happen to the messages in a JMS queue if they do not match any one of the selectors associated with its subscribers? If JMS topics used instead of queues, will the answer be different? 10. How do you implement a priority based queue using JMS? What is the proper ways to give a group of messages higher priority? 11. If for some reason you have to delay a group of messages on a JMS queue from being processed, what is the proper way to implement it in JMS? 12. Describe the necessary steps to make a Message Driven Bean on the Weblogic server subscribe to a Foreign JMS destination, in particular if the destination is a Tibco JMS queue assuming the Tibco JMS security is turned on? 13. Describe the necessary steps to develop a XML SAX parser. Describe how XMLBean works.14. Describe how IBM MQ/JMS adaptor works. Describe the necessary steps to configure and use the IBM MQ/JMS adaptors.
NovaCarolina
- May 12th, 2010
J2EE app servers give freedom to the developer/ application deployer/ end user from vendor lockin. As far as software development is concerned, such ass servers gives flexibility in choosing between d...
Supraja
- Feb 28th, 2006
Enterprise JavaBeans (EJBs) contain the application's business logic and live business data. Although it is possible to use standard Java objects to contain your business logic and business data, usin...
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Distributed Object using RMI-IIOP
How are parameters passed to a method of a distributed object using RMI-IIOP?
NovaCarolina
- May 12th, 2010
The parameters which are passed to remote methods will be a copy of the actual parameter objects. The basic rule is that the parameters should be Serializable or primitives. The remote JVM will get an exact copy of the objects being passed as parameters from the client JVM.
EJB Interview Questions
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