rmi://registry_hostname:registry_port/servicename in Java

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rmi://registry_hostname:registry_port/servicename
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where registry_hostname is the hostname or IP address of a rmiregistry, registry_port is an optional port field for nonstandard registry locations, and servicename is the name of an RMI service The default port for an rmiregistry 1099 Methods All methods provided by the Naming class have public access modifiers The Naming class defines the following methods:
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static void bind ( String url, Remote obj) throws javarmi AlreadyBoundException javarmiAccessRestriction, javanet MalformedURLException, javarmiRemoteException inserts a registry
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entry (specified by the URL string) for the remote service into the registry, and "binds" the entry to that object If the remote service is already bound, the operation is not permitted, an invalid URL is specified, or the registry is not available, an exception will be thrown static String[] list( String url ) throws javanetMalformed URLException javarmiRemoteException returns a list of services available from the specified rmiregistry (denoted by the URL string) If an invalid URL is specified, or the registry was not contactable, then an exception will be thrown static Remote lookup( String url ) throws javarmiAccessExcep tion javarmiNotBoundException, javanetMalformedURLException, javarmiRemoteException returns a reference for the remote object represented by the specified registry entry (denoted by the URL string) This reference may then be cast to a particular RMI service interface (for example, an RMILightBulb, as used earlier in the chapter) If the operation is not permitted, the registry entry does not exist, or the registry is not contactable, then an exception will be thrown static void rebind( String url, Remote obj) throws javarmi one does not exist, for the specified remote object If the operation is not permitted, an invalid URL is specified, or the registry is not available, an exception will be thrown static void unbind( String url) throws javarmiAccessException
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javarmiNotBoundException, javanetMalformedURLException, AccessException javanetMalformedURLException, javarmi RemoteException modifies an existing registry entry, or creates a registry entry if
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javarmiRemoteException removes a registry entry (specified by URL string) for a remote service and "unbinds" the remote service associated with that entry If removal of the entry is not permitted, an entry for that service does not exist, an invalid URL is specified, or the registry is not available, an exception will be thrown
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RMISecurityManager Class All RMI servers and clients that support dynamic class loading (discussed in Section 1110) will require a security manager to be registered with the JVM For convenience, an RMI-specific manager is provided that protects rogue code from initiating network connections, masquerading as servers, or gaining file access This is a more restrictive form of security than that imposed on applets, but may be modified to grant additional privileges by using a security policy file The RMISecurityManager class extends the javalangSecurityManager class The default action of each method is to throw a SecurityException, unless additional privileges have been granted by a security policy The number of methods of any security manager is extremely large and not particularly relevant to a networking text However, more information about these methods may be found in the Java API documentation AccessException Class An AccessException may be thrown by the Naming class to indicate that a bind, rebind, lookup, or unbind operation cannot be performed This class extends the javarmiRemoteException class AlreadyBoundException Class If a remote object is already bound to a registry entry, or if another object has already bound that service name, then AlreadyBoundException class is used to indicate that the bind operation could not proceed The RMI service could unbind and attempt the bind operation again, or it could use the rebind method of the Naming class This class extends the generic javalangException class ConnectException Class This exception class represents an inability to connect to a remote service, such as a registry This class extends the javarmiRemoteException class ConnectIOException Class Similar to the ConnectException class, this represents an inability to connect to a service to execute a remote method call This class extends the javarmi RemoteException class MarshalException Class This class represents an error that has occurred during the marshalling of parameters for a remote method call, or when sending a return value For example, if the server connection is disconnected while writing arguments, this may be thrown If it occurs at the client end, it is impossible to tell whether the method was invoked by the remote system a subsequent method invocation may actually cause the method to be invoked twice While not always significant, it is something that developers should be mindful of, if the method causes state information to change This class extends the javarmiRemoteException class NoSuchObjectException Class
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If an attempt to invoke a remote method is made, and the object to which the reference points no longer exists, a NoSuchObjectException may be thrown This indicates that the method call never reached the object, and may be transmitted at a later date (or to another machine), without a duplicate of the method call being sent This class extends the javarmiRemoteException class NotBoundException Class When attempts are made to look up or unbind a registry entry that does not exist, the
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NotBoundException class is thrown by the Naming class This class extends the generic javalangException class
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RemoteException Class The RemoteException class represents an error that occurs performing a RMI operation It is the superclass of many exceptions defined in the javarmi and javarmiserver packages It extends the javaioIOException class ServerError Class Representing an error that occurs in an RMI server, this class indicates that the method invocation caused a javalangError to be thrown This error extends the javarmiRemoteException class ServerException Class When a method call to an RMI server causes a RemoteException to be thrown by the object implementing the service interface, a ServerException is thrown StubNotFoundException Class If a stub for an RMI service interface cannot be located on the local file system (or externally, if dynamic class loading is enabled), this exception is used to indicate failure to locate the necessary class definition For a remote object to be passed as a reference and unmarshalled, or a remote object method to be invoked, stub class definitions are required This class extends the javarmi RemoteException class UnexpectedException Class The UnexpectedException class is used by clients to represent an exception thrown by a remote method that was not declared in the throws clause of the RMI interface This class extends the javarmiRemoteException class UnknownHostException Class If a client making a remote method request can't resolve a hostname, the java rmiUnknownHostException will be thrown This should not be confused with the similarly named javanetUnknownHostException, which is not RMI specific This class extends the javarmiRemoteException class UnmarshalException Class The UnmarshalException class represents an error during the unmarshalling process, either of arguments or of return values If, for example, the class definition for a remote interface could not
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be located due to a javalang ClassNotFoundException being thrown, it would be represented by an UnmarshalException This class extends the javarmiRemoteException class 11912 Package javarmiactivation The javarmiactivation package supports remote object activation, an advanced topic discussed later in the chapter (see Section 1112) As the reader is unlikely to use every class and interface from this package, only the most important classes and exceptions are covered Readers are advised that activation is an advanced topic of RMI, and is not essential for the development of RMI systems Nonetheless, some readers may be interested in learning more about the javarmiactivation package, or may wish to come back to it at a later time Furthermore, only the most important of classes, interfaces, and methods used to create activation RMI systems are discussed For further coverage of this package, see the Java API documentation for javarmiactivation Activatable Class This class provides a base from which remote objects that support activation can be built Just as the UnicastRemoteObject class provides all of the necessary code to create remote objects, so too does the Activatable class Developers creating activatable services must extend the Activatable class, implement a remote service interface, and provide their own implementing methods for that service interface All of the constructors for the Activatable class are marked protected, and not used by developers, but there are several useful methods that the reader may want to be aware of Methods Unless noted otherwise, all methods of the Activatable class are public
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static Remote exportObject ( Remote obj, ActivationID id, int port ) throws javarmiRemoteException makes the specified remote service available at the specific port Activatable objects should not invoke this static method;
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