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Oracle WebLogic Server: The Market Leading Application Server. Oracle WebLogic Server 12c is the number one application server, with a 40 percent share. Section , "WebLogic Server API Examples and Sample Application" Oracle WebLogic Server is a scalable, enterprise-ready Java Platform, Enterprise. In this chapter, we will introduce you to the basics of WebLogic Server, with terms and concepts that Various ways to use WebLogic Server as an HTTP server.

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Oracle WebLogic Server: the Administration Console, the Node Manager Oracle WebLogic Server 11g is a component of Oracle Fusion Middleware 11g. WebLogic Server supports the following Web Service standards. – JAX-WS – JAX-RPC – Web Services for Java EE – Web Services Metadata. credited with creating the first J2EE application server, the WebLogic Application Server. BEA Systems acquired WebLogic, Inc in Oracle Corporation.

You can start and stop Admin Server using: Server class is the main class for a WebLogic Server instance.

WebLogic uses the T3 protocols for internal and external connections to the servers. Proprietary of WebLogic Server. Http protocols are used primarily for HTTP communication between the browser and the web server. So you can access a web page hosted by the server using a URL such as https: All that has changed is the protocol over which the client must communicate with the server. The Administration Server stores the master copy of the domain configuration, including the configuration for all Managed Servers in the domain.

Each Managed Server stores a local copy of the domain configuration file. When a Managed Server starts, it connects to the Administration Server to synchronize the configuration. When the configuration is changed, the Administration Server sends the changed configuration to the Managed Servers. WLS 9. Multicast is easier to explain over Unicast.

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There is a defined range for valid Multicast address Everyone listening on the given address hears the announcement just like following a Twitter post. Unicast is more of a point to point UDP option to send the packet to a specific member and not everyone. That way, unicast is more of a private conversation between two individuals while multicast is more of a shout to a group or room.

But Unicast can span across routers and does not have to worry about TTL without the everyone hearing the announcement. So, Network Admins in general prefer to go with Unicast over Multicast for these reasons. At the time of the creation of domain, the wizard for setting configuration asks for the details like user name, password etc. If the domain is created in development mode, the configuration wizard saves the encrypted password as well as the username inside an identity file.

This file is available for reference during the time of booting so that in the absence of this file, system can prompt the user for the purpose of entering credentials. A new boot — identity file can be created if you want to change the use credentials or else if you are having the requirement of creating domain in the production mode.

WebLogic Server installs the following script that you can use to set the classpath that a server requires: WebLogic Server uses two mechanisms to determine if a given server instance is unavailable.

By monitoring heartbeat messages, server instances in a cluster determine when a server instance has failed. The other server instances will drop a server instance from the cluster, if they do not receive three consecutive heartbeats from that server instance WebLogic Server also monitors socket errors to determine the availability of a server instance.

For example, if server instance A has an open socket to server instance B, and the socket unexpectedly closes, server A assumes that server B is offline. Clustering is the process of grouping the servers together for accomplishing high percentage of scalability and availability. The major goal of performing the process of clustering is to make high scalability as well as availability of the servers possible. This process also helps in balancing the load in a proper manner and also accomplishes failover.

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The communication through cluster is made possible by the multicast IP as well as port by the process of sending periodic messages which are normally called as heartbeat messages. Oracle bought Weblogic from BEA.

This utility is used to apply the WebLogic Server Patches. The usual process is that in case of any difficulty for the manager server to get connected to any administration server at the time of start up, there is an option for the managed server to retrieve the configuration related to it from the configuration files as well as other files involved.

The information thus retrieved cannot be altered and it is possible only when the administration server is really available. When the administration server is unavailable, then the managed server enters into its independence mode for carrying out its operations. There are two modes Development mode: You use development mode while you are developing your applications.

Development mode uses a relaxed security configuration and enables you to auto-deploy applications. Production mode: You use production mode when your application is running in its final form. A production domain uses full security and may use clusters or other advanced features. There are two method of clustering Horizontal and Vertical.

Horizontal clustering: Horizontal scaling is more reliable than vertical scaling, since there are multiple machines involved in the cluster environment, as compared to only one machine Vertical clustering: There are three starting modes are available: Administration Server copies the deployment files from their original location on the Administration Server machine to the staging directories of each target server 2 External Stage: The Administration Server does not copy deployment unit files; instead, all servers deploy using the same physical copy of the deployment files, which must be directly accessible by the Administration Server and target servers.

A Java thread dump is a way of finding out what every thread in the JVM is doing at a particular point in time. The enhancements comprise of the object replacement, the working of the seblogic server — clusters and also HTTP. T3 also performs serialization of java object and also predation of RMI. T3 can be considered as a superset associated with java object. T3 is mandated between WebLogic servers, programmatic clients and cluster associated with WebLogic server.

HTTP is the protocol that is made used for the purpose of enabling communication between the WebLogic server and processes. IIOP is a kind of protocol helpful in enabling the communication between WebLogic server and object request broker. How do stubs function inside WebLogic server cluster at the time of failure?

Stubs perform the process of removing the failed instance from the list whenever there is a failure. The stub usually makes use of DNS for finding the running server and also for obtaining the list of the instances that are currently available with the application.

List of the instances available with the server inside cluster gets periodically refreshment and allows in acquiring advantages associated with new servers.

The advantages are gained as the server gets added to the cluster. Bandwidth gets wasted in the case of continues DNS requests to that of unavailable machine at the time of server failure. This problem usually occurs during the time of startup associated with the application that of client side. This removal prevents the clients from accessing failed servers. A third party load — balancers are made used for avoiding the unnecessary DNS requests. Some of the third party load — balancers are BigIP, resonate, local director and Alteon.

The main function of these third party loads — balancers is to mask multiple addresses of DNS in to a single one. T3 is capable of providing framework or overall structure for the messages that are capable of supporting the enhancements. The enhancements comprises of product tunneling, working in the context associated with clusters of WebLogic server and also in object replacement. Stub is usually expected by the people who connect to the WebLogic server cluster.

The stub has the list that consists of the available instances of server that perform host implementations associated with object. The stub also has the functionality of balancing the load by distributing load amongst the host servers. With a server crash, there is no existence for the Java process and if it is a server hang, then the Java process stops responding.

You need to refer this file for finding out the root cause for such a crash.

In the case of native IO being the origin of thread, you need to disable it. If the origin of the problem is from the driver, need to contact the driver team. How can Server Hang be solved? Java WebLogic. Admin PING needs to be checked for finding whether you get a normal and positive response. You can find out the root cause for hanging from this file.

You just need to rectify the errors that are identified from this file. Explain the reasons for server hang? The major reasons that lead to the server hang are memory leak, deadlock, and long time for returning. Define memory leak? Memory leak is the condition that arises when the objects get retained in the heap even after they have no use.

There are various reasons that can lead to this condition and they are Insufficient size of the heap compared to the extra load. Placing of the objects takes longer period of time like that of HTTP sessions.

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Occurrence of memory leak inside the application code. If the condition has aroused because of HTTP session, then it will be automatically solved when the session gets time out.

You should also verify the code associated with the handling of jdbc connectivity.

You should also optimize the size of the heap by considering the load. When can high usage of CPU occur? This is the condition that usually occurs when a single thread or process makes use of a larger portion of the CPU in an unexpected manner. How can the issue associated with high CPU usage be solved? In windows platform the issue of CPU high usage can easily be solved by making use of pslist and also with the process explorer to observe the function performed by the thread or the process.

Explain the term clustering?

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Clustering is the process of grouping the servers together for accomplishing high percentage of scalability and availability. What is the purpose of clustering? The major goal of performing the process of clustering is to make high scalability as well as availability of the servers possible. This process also helps in balancing the load in a proper manner and also accomplishes failover.Classloading Analysis and Configuration Classloading is a complex, and often misunderstood area of application servers.

The files supplied to support and enable JPA 2. Java WebLogic. It allows business applications to process exceptionally large volumes of transactions with extreme efficiency and linear scalability. Click the Start button below the managed server you want to start.

Seeing that the little devil buried his head in his clothes, Fang 1Z Study Materials Yi could not help but lick his mouth. So you can access a web page hosted by the server using a URL such as https: