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'[[File:RMI-Stubs-Skeletons.svg|thumb|right|400px|A typical implementation model of Java-RMI using [[Class stub|stub]] and [[Distributed object communication#Skeleton|skeleton]] objects. Java 2 SDK, Standard Edition, v1.2 removed the need for a skeleton.]] In [[computing]], the '''Java Remote Method Invocation''' ('''Java RMI''') is a [[Java (programming language)|Java]] [[Application programming interface|API]] that performs [[remote method invocation]], the object-oriented equivalent of [[remote procedure call]]s (RPC), with support for direct transfer of [[Serialization#Java|serialized]] Java classes and [[Distributed Garbage Collection|distributed garbage-collection]]. The original implementation depends on [[Java Virtual Machine]] (JVM) class-representation mechanisms and it thus only supports making calls from one JVM to another. The protocol underlying this Java-only implementation is known as Java Remote Method Protocol (JRMP). In order to support code running in a non-JVM context, programmers later developed a [[Common Object Request Broker Architecture|CORBA]] version. Usage of the term '''RMI''' may denote solely the programming interface or may signify both the API and JRMP, [[IIOP]], or another implementation, whereas the term [[RMI-IIOP]] (read: RMI over [[IIOP]]) specifically denotes the RMI interface delegating most of the functionality to the supporting [[CORBA]] implementation. The basic idea of Java RMI, the distributed garbage-collection (DGC) protocol, and much of the architecture underlying the original Sun implementation, come from the "network objects" feature of [[Modula-3]]. ==Generalized code== The programmers of the original RMI API generalized the code somewhat to support different implementations, such as a [[Hypertext Transfer Protocol|HTTP]] transport. Additionally, the ability to pass arguments "[[Call by value|by value]]" was added to CORBA in order to be compatible with the RMI interface. Still, the RMI-IIOP and JRMP implementations do not have fully identical interfaces. RMI functionality comes in the package {{Javadoc:SE|package=java.rmi|java/rmi}}, while most of Sun's implementation is located in the <code>sun.rmi</code> package. Note that with Java versions before Java 5.0 developers had to compile RMI stubs in a separate compilation step using <code>'''rmic'''</code>. Version 5.0 of Java and beyond no longer require this step. ==References== {{reflist}} ==External links== *{{cite web |title=Remote Method Invocation Home |url=http://www.oracle.com/technetwork/java/javase/tech/index-jsp-136424.html |website= Oracle Technology Network for Java Developers |publisher=[[Oracle Corporation]] |___location=Redwood Shores, CA, USA |access-date=2014-07-14}} * [http://download.oracle.com/javase/tutorial/rmi/index.html The Java RMI tutorial] - a good starting point to learn RMI. Also check the [http://java.sun.com/j2se/1.5.0/docs/guide/rmi/hello/hello-world.html Hello World in RMI] * [http://java.sun.com/developer/onlineTraining/rmi/RMI.html the Java RMI online training] - Very good for training JavaRMI and as reference * [http://docs.oracle.com/javase/7/docs/technotes/guides/rmi/index.html The RMI page in the JDK docs] * {{Javadoc:SE|package=java.rmi|java/rmi}} (Sun's Java API Reference for the RMI package) * {{cite document | author1= Ann Wollrath | author2= Roger Riggs | author3 = Jim Waldo |author3-link=Jim Waldo | title= A Distributed Object Model for the Java System | url=http://pdos.csail.mit.edu/6.824/papers/waldo-rmi.pdf | access-date= 2009-02-11}} * [http://docs.oracle.com/cd/E12840_01/wls/docs103/rmi/rmi_intro.html Programming WebLogic RMI] - an introduction to RMI in Oracle Weblogic. * [http://notes.corewebprogramming.com/student/RMI.pdf General Remote Method Invocation] [[Category:Java platform|RMI]] [[Category:Remote procedure call]] [[Category:Articles with example Java code]]'