rmic [options] class in Java

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where options is one or more of the supported options, and class is the Java qualified name of a remote class: a class which implements a remote interface For each class XXX, rmic generates a stub class whose class file is named XXX_Stubclass If the v11 or vcompat option is specified, or if you are using JDK 11, it also produces a skeleton class whose class file is named XXX_Skelclass You must avoid defining classes with names of these forms, so as to avoid clashing with classes generated by rmic The stub and skeleton classes generated by rmic are defined in the same package as the server class Up to and including JDK 122, these class files are produced in the current directory From JDK 13, the class files are produced in the same directory as the source class In either case, if the behaviour is not what you want, specify the directory with the d directory option In our experience the JDK 13 behaviour is what you want, and indeed this is why it was changed Consult the JDK documentation for full details on rmic 771 Stub protocols The RMI stub protocol is used by the stub to communicate with the server So far there are two versions of this protocol:
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11, which communicates with a skeleton 12, which communicates with a reflection based dispatcher introduced in JDK 12
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Which protocol is used depends on two factors: what kind of stub was generated, and which JDK the client is executing under The 11 stub protocol is used when the client is executing under JDK 11, or when the stub was generated with rmic v11 (or both) The 12 protocol is used in all other cases This information is summarized in Table 73
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Table 73 Stub protocols
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rmic flag vcompat (default) vcompat (default) vcompat (default) vcompat (default) v11 v12
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Server JDK 11 11 12 12 Any 11 12 12
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Client JDK 11 12 11 12 Any Any 11 12 11
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Stub protocol
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Not supported[a] 11 12 11 Not supported[b] Not supported 12
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This case shouldn't arise, because the stub must be generated by the JDK which is used
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to support the server JDK 11 always generates 11 style stubs If the situation is constructed artificially, a run time protocol error may result
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This case shouldn't arise, for a similar reason to the above: JDK 11 can't generate a 12 style stub If you are not deploying servers or clients with JDK 11, you should use the v12 parameter to rmic, which does not generate skeleton classes one less thing to install at the server 772 Installation and distribution Stub class files are required by both clients and servers You can use RMI code mobility, discussed in 9, to make stub files available to clients; otherwise you must ensure that stub files are distributed with the client parts of your application Server implementation class files and skeleton files are normally not required by clients at all, and should not be distributed to them, except when clients export their own servers (eg to implement a callback function): in this case, clients need all the classes concerned
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78 Foundation classes
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This section describes the foundation classes RemoteObject and RemoteServer, and provides general information about remote object semantics 781 RemoteObject javarmiserverRemoteObject is the abstract base class for the standard RMI server and stub classes It implements remote object semantics by overriding the methods for equals, hashCode, and toString The hashCode and equals methods are implemented to allow RemoteObjectreferences to be stored in hashtables and compared:
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the equals method returns true if two RemoteObjects refer to the same remote object the hashCode method returns the same value for all remote references that refer to the same underlying RemoteObject (because references to the same object are considered equal) the toString method "is defined to return a string which represents the remote reference of the RemoteObject"[8]
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RMI specification, 511
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Equality of two RemoteObjects is not tested by comparing the contents of the objects, because (a) that would require two remote method calls, which would be slow, and (b) these method calls could throw a remote exception, which the equals method can neither deal reasonably with nor throw Objects that require these remote semantics may extend RemoteObject, typically via RemoteServer, UnicastRemoteObject, or Activatable RemoteObject also provides a getRef method which returns the remote reference for the object A remote reference is an internal handle for a remote object, used by remote stubs to carry
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out remote method invocations to the remote object, or by remote servers to export themselves or get the client's hostname 782 RemoteServer javarmiserverRemoteServer is the abstract base class for the classes UnicastRemoteObject and Activatable It provides a getClientHost method, which returns the hostname of the current client (or throws a ServerNotActiveException if not called within a remote method invocation), and getLog and setLog methods, for controlling server logging[9]
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All these methods are static Up to JDK 13, the JDK documentation described RemoteServer as also providing abstract methods which a concrete implementation class such as UnicastRemoteObject must implement: this statement is incorrect in all versions of Java we have seen 783 Semantics of remote objects The public methods exported by javalangObject include equals, hashCode, and toString These methods define the semantics of a local object properties which Java can rely on as being exhibited by any Java object The semantics of a remote object are a compromise between being identical with the semantics of local objects, which would require RMI calls for each of the methods listed above, and the requirements of efficiency, which dictate that each of these methods be implemented without requiring a remote method invocation Remote semantics are only required of objects acting as proxies for remote objects ie remote stubs which, as generated by rmic, always inherit the required behaviour from RemoteObject Remote objects exported servers may implement remote semantics: either those of RemoteObject or some other semantics (eg equality of a remote server and its stub) Remote objects should implement remote semantics if they are going to be used in local hashtables (eg to associate remote objects with their stubs, to enable local call optimization)
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