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Rolling upgrades. Explain about the function associated with T3 in WebLogic server? T3 provides enhancements support for the messages of WebLogic server. 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. Explain the use of HTTP? HTTP is the protocol that is made used for the purpose of enabling communication between the WebLogic server and processes.
Explain the functionality of IIOP? 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. How can default JVM be changed to other? For changing the JVM can be done by following the steps below.
Change the config. 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. Explain the functionality of T3 associated with WebLogic server?
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.
How can classpath be set? Explain the functioning of Stub?
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. The first step involved in this process of creating pooling is to download 3 jar files which are the commons-dbcp The next step is to make an entry inside server.
How can you differentiate server crash and server hang? 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. What are the causes for server crash? How can you solve the issue of server crash? 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. The package names in the package manager have a number of regexes i. If two or more packages match, a Package Preference Algorithm is applied which seeks to discover the package with the lowest preference; the version of the "most trusted" package is returned.
This method has been found to occasionally work but only in some environments and with old versions of WebLogic Server Application Model Produced by Software Pattern Product Architecture It is possible to run multiple instances of Weblogic on a single host. In this case they will have cluster name set for their configuration in config.
Each cluster should have its own unique communication socket either unicast or multicast.
RootDirectory' or 'weblogic. Server' in its argument list or one of the Windows services, beasvc. The pattern attempts to add domain, cluster, listen address, listen port, ssl listen port, channels, default protocol and default secure protocol information to the Software Instance. Virtual Hosts can be configured in two ways: by specifying server name or server's cluster name as a target.
Note that if unicast messaging mode is used the pattern obtains the socket details from the related Channel Detail which is used for the communication by the curent WebLogic Cluster.
Pattern aims to determine whether the discovered Application Server is an Administration server in order to populate JMX port information which can then be used for extended discovery of WebLogic. This confirmation is obtained via config.
JMX information obtaining from config. Starting from BMC Discovery The extended J2EE discovery functionality includes approach which uses the WebLogic configuration file - config.