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Difference between JDK, JRE and JVM. Java Virtual Machine is a specification and implementaion provided by sun microsystem. It is an abstract machine that is used to provide runtime environment for java application or applet.

Difference between JDK, JRE and JVM. Java Virtual Machine is a specification and implementaion provided by sun microsystem. It is an abstract machine that is used to provide runtime environment for java application or applet.

Cliff Click from Azul Systems talks about JVM services. Appx 45 mins.

Java Topic / Java tutorial Here we will discuss about various terms like JDK, JRE, JVM, JIT and applications like javac, java.

Aegis professionals will share information about JVM and Docker and how their combination can be really helpful for Java Developers. This article is shared to Help Java Development Community and the developers all over the world.

Good and quick tutorial on how to find memory usage in java with example. step by step guide to get free memory, max memory and total memory from JVM. memory usage is critical for performance point of view

Aspect-oriented computing is continuing to increase in popularity. The modularity inherent in OSGi and Eclipse offers unique opportunities for managing and applying aspects by supplying them in bundles and directing their application to particular sets of bundles. This incubator work area is dedicated to delivering an integration of aspects and OSGi. The goal is to allow developers to use the Equinox together with AspectJ by combining the benefits of both worlds. Using a load-time weaving extension you are able to add AspectJ aspects to your bundle-based system just by putting them into general OSGi bundles. It does not matter if the pointcuts you defined inside the aspects contain join points that are defined by classes within the same bundle or any other bundle in your installation. The load-time weaving extension will take care that your aspects are woven with the appropriate classes at load-time. To illustrate this lets assume the following situation: You would like to write an aspect that traces something within the JDT plug-ins of Eclipse. Without some kind of load-time aspect weaving you would somehow need to recompile those JDT plug-ins using AJDT (for example) together with your aspect. By using the load-time aspect weaving extension all you need is to implement your aspect and add that bundle to your system. The load-time aspect weaving extension takes care of weaving your aspect with the JDT code as it is loaded. And it doesn't matter if a new JDT is installed by the user later on. The next time your application is started the load-time aspect weaving will take care of weaving your aspect into these bundles as well, if necessary. With this technology is becomes possible to modularize crosscutting concerns across different plug-ins while keeping the idea of separate compilation for bundles. Goals Provide Runtime Modularity and Versioning for Crosscutting Concerns: Aspects are used to implement crosscutting concerns. However such concerns usually compr

ability to process large amount

Janino is a super-small, super-fast Java™ compiler. Not only can it compile a set of source files to a set of class files like the JAVAC tool, but also can it compile a Java™ expression, block, class body or source file in memory, load the bytecode and execute it directly in the same JVM. Janino is not intended to be a development tool, but an embedded compiler for run-time compilation purposes, e.g. expression evaluators or "server pages" engines like JSP. JANINO is integrated with Apache Commons JCI ("Java Compiler Interface") and JBoss Rules / Drools. JANINO can also be used for static code analysis or code manipulation. JANINO can be configured to use the javax.tools.JavaCompiler API (available since JDK 1.6), which removes the Java 5-related limitations.

JRockit is an alternative to the standard Sun/Oracle/OpenJDK JVM. It was developed by BEA, primarily to provide better performance for users of BEA's Websphere. JRockit was previously a commercial product. This article explains that JRockit is now free, released under the Binary Code License - the same license Sun used to publish the J2SDK under.

Some JVMs put restrictions on the total amount of memory available on the heap. If you are getting OutOfMemoryErrors while running Eclipse, the VM can be told to let the heap grow to a larger amount by passing the -vmargs command to the Eclipse launcher. For example, the following command would run Eclipse with a heap size of 256MB: eclipse [normal arguments] -vmargs -Xmx256M [more VM args] The arguments after -vmargs are directly passed to the VM. Run java -X for the list of options your VM accepts. Options starting with -X are implementation-specific and may not be applicable to all VMs. You can also put the extra options in eclipse.ini.

The goal of the Eclipse Scout project is making it easy to build distributed enterprise applications based on the Eclipse platform. It consists of a runtime framework providing transparent service communication between the client and backend part and is shipped with a rich set of common user interface components. The user interface is not built for a particular rendering technology but it encapsulates the core functionality into a headless model. GUI factories are available for rendering the client model into a particular target UI platform. SWT and Swing are supported out of the box and an AJAX GUI factory could be easily added. Developing Scout applications is supported by the Scout SDK, a plug-in set built on top of Eclipse PDE and Eclipse JDT. The Scout SDK works directly on the bare Java resources and assists the development task by providing an augmented view on the underlying Java code. Additionally, it comes with a rich set of wizards and operations for modifying the Scout application project just by editing the underlying Java code. There is no meta-data required. Hence a developer can switch between editing resources using Eclipse's standard editors and leveraging the features of Scout SDK at any point in time. Eclipse Scout can be used to create multi-tier client/server applications, standalone client applications or OSGi-based server applications. Basically, there are three main advantages when choosing Scout as your framework for building such applications. First, the Scout runtime is service oriented by design. Almost every functionality is provided as an OSGi service. Every OSGi bundle may make use of them. Second, Scout provides a rich set of UI elements being uncoupled from a particular GUI technology. And third, building distributed client/server applications is as easy as if both parts would run within the same local JVM.

"Finagle is a library for building asynchronous RPC servers and clients in Java, Scala, or any JVM language. Overview Built atop Netty, Finagle provides a rich set of tools that are protocol independent. Finagle is flexible enough to support a variety of RPC styles, including request-response, streaming, and pipelining (e.g., HTTP pipelining and Redis pipelining). It also makes it easy to work with stateful RPC styles (e.g., those requiring authentication and those that support transactions)."

Merit campus provides the best online java training. Learn Java programming if you are a beginner, Intermediate or an expert. Practice tests on creation of java, servlets, JDK, JRE, JVM, JIT, Java Compiler and Evolution of Java etc.

Universal Java Thread dump analyzer is a free tool that parses all formats of thread dumps and produces beautiful graphs,insightful metrics. It's intelligent thread dump analysis patterns identifies root cause for CPU spikes, Poor response time, unresponsive JVM, deadlocks, OutOfMemoryError.