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Java Standalone App (application) has its unique properties and should be considered, due its platform facilities to distribute your software to any kind of machine. Java can also be claimed as a perfect language for network based applications, because of its potential to complete with all the tools similar to UNIX: ssh, who, tcpdump, ping and also for its other functions java can create and deploy. In terms of performance java is user-friendly to double click and also runs like an original program on Operating system.
The only difference being it is relatively faster than the native program which was used 4 years ago. The creation of a new java virtual machine will initiate the process of running the program faster than the native program.
Java applications include the network based applications and a set of java classes. Java virtual machine is usually packaged as executable or to be embedded in other application. For e.g. a standalone JVM executable is a java launcher, which as a bundle of compilation called the java development kit. If the JVM is embedded in a server, it will enable us to write a customized JVM wrapper, which is a standard java, consisting of java native interface implementation, thereby providing a two-way interaction between C/C++ and Java code.
Java classes can be comprised in a set of files archives or fetched over a network. Delivering Java application as a combination of launcher and a set of files poses security and maintenance problem - files with Java Code has to be installed; launcher has to be aware of their exact location, etc. By combining customized launcher and in-memory class loader, enables delivering Java application as a single executable file.
The java stand alone application consists of two sets of utilities: Java class converter and customized launcher. The Java class converter takes, Java classes packaged in standard form – as a directory structure or library files and outputs or the same classes in an object file. To make implementation more moveable, intermediate file format is employed - intermediate file can be created in C or assembler programming languages. Generated code is an array of data, representing Java classes’ called as the byte code.
The code is linked with a modified launcher, making a byte code available to throw regular C references. Customized launcher works in two authenticated steps: first, in-memory class loader, it is loaded in JVM; then the reference to be converted and compiled Java classes is passed down, in-memory class loader, making a compiled Java classes available for JVM. |
