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.
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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.
The installation process for the synchronization plugin uses the maven install goal to manually upload the plugin into the repository. This is a method of installation that is non-interactive and is usually based on the. For integration with Oracle Coherence that supports scaling JPA applications up onto large clusters and leveraging the processing power of the grid to parallelize queries for Oracle Coherence cached objects. 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. 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.
Within the request it passes along some additional information that indicates what WebSocket capabilities it supports. This is called the opening handshake. This response is called the opening handshake response. Once the WebSocket connection has been established, the client and the server can then freely send WebSocket back and forth.
The connection stays alive until either peer decides to explicitly close the connection or something external such as a network timeout due to inactivity or a problem with the underlying network causes the connection to be closed. Data is sent over a WebSocket connection as a series of WebSocket messages. Each WebSocket message is sent within a data frame, with long messages being broken up into multiple frames that are sent in order, with the recipient reassembling them to reproduce the original message.
The API introduces the concept of a WebSocket Endpoint, which is responsible to handling one side of a conversation, sending and receiving messages as required and responding to the lifecycle activities that are imposed on it. The server-side of the WebSocket connection is known as a ServerEndpoint. There are two approaches defined in the specification for creating ServerEndpoint implementations — an annotation based approach, where the configuration of the Endpoint itself and the appropriately defined lifecycle methods are specified using annotations, such as OnOpen, OnMessage and so forth.
The second approach is with its programmatic API that provides developers with base classes and interfaces that are used to provide the necessary lifecycle methods and to dynamically define and configure Endpoint instances.
The core lifecycle events that are sent to an application that exposes WebSocket endpoint are the following: For example, as a slight variant on the usual echo WebSocket, the following class receives a message from a WebSocket client and sends it back in a reversed form.
OnMessage; import javax. The OnMessage annotation denotes the method used to handle incoming WebSocket messages. In this simple case the method receives a whole text message.
Additional method definitions can be used to receive binary messages as well as handling partial forms for both message types.
The Endpoint class defines an equivalent set of lifecycle methods that can be overridden to handle WebSocket open, error and close events. This method is invoked when messages are received by the Endpoint.
As with the annotated model, the MessageHandler and requisite onMessage method can take one of several forms to allow it to handle text and binary messages that are received as either whole or partial messages.
IOException; import javax. Endpoint; import javax. EndpointConfig; import javax. MessageHandler; import javax. In this implementation a ServerEndpointConfig instance is created that contains the Endpoint class es and the URI s for clients to access it. The ServerEndpointConfig class can also handle more complex tasks such as sub-protocol negotiation, origin server checking and so forth.
HashSet; import java. Set; import javax. ServerApplicationConfig; import javax. For working with custom Java objects, the specification defines the concept of Encoder and Decoder components, which can be implemented to transform custom Java objects to and from a format that can be sent as a WebSocket message.
For developers that have been using the asynchronous Ajax programming style where HTTP requests are made and callback functions used to handle the asynchronous responses when they are received, the WebSocket API has a very familiar feel, but offers the benefits of using the more efficient and powerful WebSocket Protocol. For example, a simple WebSocket client application to call the reserving echo WebSocket endpoint would make calls as shown below, to open the connection, send a message and receive a message back via the onmessage callback function.
To that end the JSR specification, in addition to providing a server-side programming model, also addresses the area of creating the client-side of a WebSocket application. A ClientEndpoint is subject to the same lifecycle and event model of the general WebSocket Endpoint and can be defined using the annotation or programmatic model.
WebSocketContainer; import javax. ClientEndpoint; import javax. ContainerProvider; import javax. DeploymentException; import javax. Closing time.. I got this message 'Hello! All new development activity should be focused on the Java standard API — javax. Through integration with WebLogic networking and threading services, high levels of performance and scalability have been measured in internal benchmarks, outperforming the previous implementation across the set of metrics used when the same benchmark test was performed.
WebSocket Client Emulation With the WebSocket Protocol expected to provide a cornerstone of HTML5 by enabling the server push of data to browser clients, its use will be become a common element of the many modern web applications deployed using WebLogic Server.
However there is also expected to be some situations where there are the use of WebSocket connections may be problematic because either there are network intermediaries such as firewalls and proxies that do not allow WebSocket connections, or because the browser platform being used does not support WebSockets.
In which case developers are forced to detect whether their particular deployment environment will support WebSocket connections, and if not, employ some other HTTP-based technique such as long polling to emulate server push operations. This kind of accommodation of differences in environment and browser support for WebSockets leads to additional complexity for developers in selecting and programming for such fallback situations.
To support this use case, Oracle WebLogic Server This is transparent to the developer, who is able to build applications that utilize the features of the WebSocket protocol and related programming models, while removing the need to provide explicit solutions that handle situations where WebSocket connections can not be regularly or reliably established.
These applications are often created using different programming languages and run in very different environments. JSON is suited to this scenario because it is an open standard, it is easy to read and write, and it is more compact than other representations. The tree can then be navigated, analyzed, or modified. This approach is the most flexible and allows for processing that requires access to the complete contents of the tree.
However, it is often slower than the streaming model and requires more memory. The object model generates JSON output by navigating the entire tree at once. The parser generates events and stops for processing when an object or an array begins or ends, when it finds a key, or when it finds a value. Each element can be processed or discarded by the application code, and then the parser proceeds to the next event.
This approach is adequate for local processing, in which the processing of an element does not require information from the rest of the data.
The streaming model generates JSON output to a given stream by making a function call with one element at a time. The interface javax. Similarly, the interface JsonArray provides a List view to access the ordered sequence of zero or more values from the model. The object model API uses builder patterns to create these object models.
These object models can also be created from an input source using the class JsonReader. Similarly, these object models can be written to an output source using the class JsonWriter. In this model the application code controls the thread and calls methods in the parser interface to move the parser forward or to obtain JSON data from the current state of the parser. This has specific applicability for WebSocket enabled applications where the exchange of messages with browser based WebSocket clients typically makes use of JSON.
The implementation of Encoder and Decoder classes used by WebSocket endpoints that javax. Json; import javax. JsonObject; supports import the transformation of Java objects to and from JSON representations specifically benefit from the javax. In this case, JSON is being used as the payload format. JsonArrayBuilder; import javax.
For more information, see the blog entry by Blaise Doughan at http: Java API for RESTful Web Services With the expansion in both the ease of access to and corresponding use of mobile applications that provide users with access to a vast array of information from sources such as social media posts, photographs, news stories, sports scores, stock prices, currency valuations, online gaming and the like, the interest in providing remote APIs for applications and services is following suit.
Not unsurprisingly, given the communication channel is the Internet, the growth of web services that follow the REST architectural style. RESTful web services are those that conform to architectural style constraints such as stating that resources must be fully addressable via URIs and interacted with through a uniform interface.
Integration with the Java EE platform enables applications containing these Resources to be deployed and exposed as REST web services for clients to call and make use of.
This is provided through the introduction of shared-library that can be deployed and used by deployed applications. This new standard Client API is designed to make it easy and straightforward to consume a web service exposed over the HTTP protocol and enables developers to concisely and efficiently implement client-side solutions that are now portable across vendors and environments.
One of the direct benefits of the Client API is that it allows developers to design and work at the level of the Resources they are having interactions with, instead of needing to work at the level of the HTTP protocol itself and constructing and parsing the low level interactions of HTTP needed to work with the Resource. If the code had to be written using HttpUrlConnection, the developer would have to write custom code to serialize the form data that are sent within the POST request and de-serialize the response input stream into a JAXB bean.
Jersey 2. Adding properties, parameters and objects for the call is done using the same style of fluent API. For example, to obtain a random quote from a REST service takes only several lines of code.
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. 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. This is especially useful if your Java application sometimes seems to hang when running under load, as an analysis of the dump will show where the threads are stuck.
The enhancements support for WebLogic Server messages is provided by T3. T3 is superset of java Object. Serialization and RMI can be done over T3. By default, if a Managed Server is unable to connect to the specified Administration Server during startup, it can retrieve its configuration by reading a configuration file and other files directly.
A WebLogic Server cluster consists of multiple WebLogic Server server instances running simultaneously and working together to provide increased scalability and reliability. A cluster appears to clients to be a single WebLogic Server instance. The server instances that constitute a cluster can run on the same machine, or be located on different machines.
Each server instance in a cluster must run the same version of WebLogic Server. WebSphere MQ Real-time Transport is a lightweight protocol optimized for use with nonpersistent messaging. WebSphere MQ Real-time Transport is ideal for applications where large numbers of messages need to be sent or where messages need to be sent to large numbers of client applications. The WebSphere MQ Real-time Transport does not provide any facilities for persistent messaging or durable subscriptions. Ant is an open source project available under the Apache license.
Therefore, its source code can be downloaded and modified. Additionally, Ant uses XML build files which make its development easy.
Cross Platform: Use of XML along with Java makes Ant the perfect solution for developing programs designed to run or be built across a range of different operating systems. New tasks are used to extend the capabilities of the build process, while build listeners are used to help hook into the build process to add extra error tracking functionality. As Ant is extensible and open, it can be integrated with any editor or development environment easily.
An application-specific XML-based deployment descriptor file named web. Each J2EE module is a collection of one or more J2EE components of the same container type Web or EJB that are represented by one component deployment descriptor for that type in the web. A WebLogic-specific deployment descriptor file named weblogic.
Examples of weblogic. When you upgrade a domain to WebLogic Server 8. For server-side applications, JRockit has these advantages over other virtual machines:. Stop WebLogic Server. Start WebLogic administration console. On the login screen, type your administrator user name and password, and click Log In. Start Node Manager. Ensure that WebLogic Server is running. Windows startNodeManager. Stop Node Manager. Start a WebLogic managed server. In the right pane, click the Control tab.
Select the managed server that you want to start. Click the Start button below the managed server you want to start. Stop a WebLogic managed server.