JRMP in Java Create barcode 128 in Java JRMP

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7.4 JRMP generate, create none none for none projects ISO Standards Overview JRMP is the none none native transport protocol of RMI. Similar to IIOP, it can invoke methods, and pass arguments, return values, and exceptions over the network. RMI does not typically (at this time) come with a body of services, though there is a naming service included with it.

The most significant difference from IIOP however, is that JRMP does not restrict argument and return types to data values, JRMP handles objects. Objects have state and behavior, which means that JRMP provides a mechanism to transfer the class file of an object into the recipient of an argument or returned value (or an exception for that matter). This copying of class file is done on an as-needed basis to avoid wasting bandwidth.

Before you can copy classes, you must complete additional administrative setup. Because these setup tasks are sometimes not done, or done incorrectly, you sometimes find RMI/JRMP systems that exhibit the more limited behavior of CORBA, that is, that do not move objects over the network, but only move state. This is not always a problem, provided the system is designed that way, indeed, it can result in slightly higher performance and slightly lower network bandwidth usage.

Because JRMP is the native protocol for RMI and does not have to support a myriad of different host data formats and byte ordering, there is less overhead in setting up the argument and return values for a call over JRMP than with language neutral systems, such as IIOP. Used correctly, this can result in higher performance. JRMP does not include encryption or identification of parties by default.

However, it is easy to set JRMP to use SSL as a transport. This is achieved by using socket factories. Further information on the mechanics of this is in the API documentation.

Additionally, Java Authentication and Authorization Service (JAAS) is a framework for distributed. authenticat ion and authorization, and adds a great deal of valuable security functionality to a system. It is common to think of JRMP as restricted to use with Java technology. This isn"t accurate.

In the same way that installation of additional code (the CORBA system) on, for example, a C++ system allows that system to communicate using IIOP, installation of additional code (a JVM) allows that same C++ system to communicate using JRMP. Therefore, the appropriate use of JNI allows JRMP to provide its functionality in a language-neutral way. JNI is bidirectional, it allows the invocation of a Java technology system from outside as well as allowing the Java technology system to invoke the legacy system.

If you try to run an applet on a customer"s system, and that applet attempts to use JRMP to communicate with one of your systems, then you will quickly run into the problem of firewalls that restrict outbound traffic. The standard solution to this is tunneling using HTTP on port 80, and this is supported by JRMP..

Essential Points The following summarizes the most important points described in this chapter. HTTP can ru none none n on any port as needed, although port 80 is the default. HTTP GET requests carry a limited amount of data from client to server, POST requests can carry unlimited amounts. HTTP is a stateless protocol.

State can be added by using cookies, URL rewriting, or using SSL as a transport (which produces HTTPS). HTTP on port 80 is usually allowed out of firewalls, so HTTP is a common choice for tunnelling. HTTPS is HTTP over SSL SSL gives encryption, validation of parties, and an identifiable session for maintaining state.

Encryption and validation in SSL depend on configuration and capabilities of both ends, and might be negotiated to nothing. SSL, and therefore HTTPS, has a significant startup overhead. IIOP is the method-invocation protocol for CORBA.

IIOP moves state for arguments and return values of method calls. CORBA defines a variety of standard services that, if installed, will be available to IIOP. CORBA services include security, transactions, and naming.

CORBA, and therefore, IIOP, is available for a variety of languages and platforms. IIOP is supported by Java IDL and RMI/IIOP. IIOP supports tunneling over HTTP/port 80.

JRMP is the method-invocation protocol for RMI. JRMP moves state and behavior (whole objects) for arguments, return values, and exceptions in method calls..

JRMP is a n ative Java technology protocol, so it has less overhead than protocols that have to perform format conversion. JRMP can use SSL and JAAS for security. JRMP connects to other languages via JNI.

JRMP supports tunneling over HTTP/port 80..
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