Weblogic Interview Questions and Answers



WebLogic Server

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Weblogic Interview Questions and Answers

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A server that supports different and various services and infrastructure which is compatible with JEE applications is known as WebLogic server.

Some of the applications that the WebLogic server is capable of deploying are WSDL, UDDI, SOAP, etc.,

The web servers which also get utilized are Apache, Netscape, and Microsoft.

The servlets that are utilizing are HTML and JSP

Here are some of the capabilities of the WebLogic Server… it provides changes in dynamic configurations, it aids in production application redeployment and it helps with the rolling upgrades.

The main function of T3 is to provide enhancements support for all the messages in WebLogic Server.

The two protocols whose sole function is to facilitate communication between the WebLogic Server and the processes are known as HTTP and IIOP

The protocol that helps facilitate communication between the WebLogic Server and the object request broker is IIOP. That is its main function.

The function of removing any failed instances from the list is performed by the stubs inside the WebLogic Server.

XML documents are the most common form of descriptors. They are associated with all the applications and modules as they are what is used to describe the contents which are in the directory.

The application that provides the entire support infrastructure or framework for messages in WebLogic Server is T3. Product tunneling is what constitutes the main part of the enhancements support.

The following script can be used to set the classpath : WL_HOME\server\bin\setWLSEnv.cmd(in case of windows)

The stub helps in distributing the excess load amongst other host servers, thus helping to balance it out.

If the instance is of a server hang, the Java process ceases to respond completely. In the case of a server crash, the Java process will not exist thereafter.

The primary reasons for a server hang would be a deadlock, a long time for returning and a memory leak.

When objects are kept in the heap long after they have outlived their usefulness, that’s when a memory leak situation occurs.

When servers are grouped or classified together for purposes of increased availability and scalability, it is known as clustering.

The main function of clustering is to ensure that the processes maintain enhanced availability and scalability. Also, clustering helps to balance out the load accurately and thus accomplishes to failover.

Communication within a cluster occurs through the multicast IP. It is also facilitated by the intermittent messages known as heartbeat messages.

The different types of WebLogic installations are as follows… silent mode, console mode, and graphical mode. Become a Weblogic Server Expert with Certification in 25hours

An installation that makes use of interactive GUI is known as a graphics mode.

An installation that is non-interactive and based on the.XML properties is known as a silent mode.

An installation that follows an interactive text-based method is known as console mode.

The method of clustering in which there is a main cluster master and each of the other servers must ping or confirm that the server is still alive and active, is known as Unicast. This is a very simple method.

Multicast method in clustering occurs when there is no main cluster master and each server must be connected with each other to validate they’re being active. This is a much more complex method than Unicast.

The process where the admin gets an actual physical copy to distribute to the instances is known as stage deployment.

The process where there is no physical copy given, however, every server needs to be connected to the source directly for procuring the item to be deployed.

The WebLogic server cluster announces the addition of the new server in the cluster.

An unlimited number of servers can be held inside a multi-processor machine.

A logical representation of the physical is known as a Machine

This is a service provided from Java which allows us to run separate processes as opposed to only WebLogic server.

A group that consists of several WebLogic server resources is known as a Domain.

When the tuning of chuck size, performance packs, chunk pool size, work manager and connection backlog buffering occurs, it is known as Core Server Tuning.

Node manager is used for WebLogic server provides permission for starting, shutting down and restarting the manager and managed server details from the distant place. It is connected with a machine and for utilizing a similar procedure for managing the server details in some WebLogic server domain till the server details stay on a similar machine.

The management component for the deployment of the WebLogic server is known as a domain. A domain is connected with the WebLogic asset to handle as a unit. A domain contains a single detail of the WebLogic server known as the management server. The manager server helps like a middle point of details for the server details and devices of system administration.

Multicast is for dispatching the announcement on the category which is paying attention to a particular multicast address and port on the mailed declaration. The restriction with multicast is the TTL across the routers requires modification and the routers are built to communicate the multicast package over the subnet.

Unicast is the alternative of UDP for mailing to a particular person. It is a very secure method to communicate with each other. Unicast has the ability to spread over the router without worrying about TLL. The manager of a network likes to use Unicast.

WebLogic permits to build and tell how the application will compute the implementation of the work. According to the rules you can describe and detect real runtime production. WebLogic can enhance the production of the application and to handle SLA.

WebLogic Servers permits to connect the JDBC objects containing the data and multi-data authority for improving the accessibility of cluster hosted application. Each JDBC object which you have built for the cluster will survive on every controlled server in the collection.

In a group, the outer customer contains the connectivity with the help of the JDBC data source on the JNDI tree. To obtain the relationship the data sources utilize the WebLogic server RMI driver. The authority of WebLogic in the outer customer application permits the customer to appeal to other relationships when the server throws the details then the earlies relationship fails.

Multi-data sources are a distraction all over the category of data sources to deliver stability in the middle of data sources connected with multi-data sources. Multi-data sources decide or choose which data sources are to utilize for satisfying the appeal on the algorithm that is chosen in the structure of the multi-data source.

WebLogic server gives the reinforcement for the servlets and JSPs with the help of duplicating the HTTP discussion condition of the customer which connects the collected servlets and JSPs. It manages the HTTP discussion states in reminder, a file system, and details. For authorizing the mechanical failback of servlets and JSPs, the session condition will continue in the memory.

A deployment descriptor file is utilized by the Java web applications to control how URLs plan to servlets, URLs verification needs and another detail. This file is considering as web.xml. It defines the categories, structures, assets of the application.

In the stage mode, It duplicates the file from the real place to the present directories of every selected server. For example – when you install a J2EE application to 3 servers in the collection then the manager server duplicates the deployment documents to the index on every three server machines. Now every server deploys the function of J2EE by utilizing the local copy of the records files.

Nostage mode, which specifies the manager server without copying the records from the origin places. Rather than every selected server should connect the record documents from a single source index for deployment. For example – When deploying an application of JEE2 to three servers in the group then a server is capable to connect the similar application record documents to deploy the application. Choose a postage mode to run a group of server details on a similar machine.

With the help of a secure Sockets layer permits two functions to connect over a web connection for verifying the person’s identity. And hiding the fats which are interchanged between the functions. The verification permits the server and a customer for verifying the identity of the function. Verification allows the facts to transfer upon the web clearly to the expected receiver.

In the production mode, to start the WebLogic Server, the server does not start up when the boot.properties is not available. WebLogic appeals for help for the user and password for managing the user. Identify the user and password in the text box. Because startup needs the framework of safety and name which is saved in a document named boot.properties.

A set of WebLogic servers details to give fall upon and duplicates services for helping expandable supreme application for the customer in a domain. The collection arrives at the customer like a single server but the set of servers performs like a single for improving expandability and solidity.

A machine is a convincing description forgiving one and more details of the WebLogic server. Every controlled server should be given to a machine. The manager server utilizes the machine described in the combination with the Node Manager to begin the distant servers.

With the help of silent-mode installation. It utilizes a copy of the installation on the numerous machines. In the silent mode at the time of installation, the application studies the settings for the structure by an XML document which is created earlier at the time of starting an installation. The application will not show the structure alternatives at the time of the installation procedure.