IDL Exception Handling in Java

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Exception handling in CORBA is a good way to indicate abnormal situations Rather than returning a simple error code as a return value, you can throw an exception Exception handling in CORBA varies slightly from that of Java, in that exceptions may not be subclasses This is in
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contrast to Java, where generic exceptions are commonly identified as being throwable, but more concrete implementations are thrown For example, javanetSocket Exception may be thrown when using the Socket class, but actually a subclass is being thrown (such as javanetConnectException or javanetNoRouteToHostException) You can, however, define several exceptions within an IDL schema, and have an operation throw more than one type of exception This is an easy workaround to the subclass limitation The following is an example of two IDL exceptions thrown by an operation The raises keyword is used to identify a method that throws an exception
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module BankingSystem { // Account inactive exception exception AccountInactive { string reason; }; // Account overdrawn exception exception AccountOverdrawn { string reason; }; interface BankAccount { double withdrawMoney(in double amount) raises (AccountInactive, AccountOverdrawn); // Further bank account methods might go here }; };
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124 From IDL to Java
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So far, we've covered the basic syntax of the Interface Definition Language The next step is to write a CORBA service described by an IDL schema and implemented in Java We'll also need to write a CORBA client that will access our service So you can compare between CORBA and RMI, we'll carry on the example of a distributed lightbulb service, first introduced in 11 For efficiency's sake, we will use the CORBA reference implementation that is included in the Java 2 platform While this is not a full production implementation, it is perfectly adequate for the purposes of learning CORBA, and it comes free as part of Java
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1241 A Sample Schema
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The following schema describes our distributed lightbulb service, which will be saved as a text file called LightBulbidl
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exception BulbBrokenException { }; interface LightBulb
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{ void on () raises (BulbBrokenException); void off(); boolean isOn() raises (BulbBrokenException); };
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The next step involves mapping this IDL schema to Java
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1242 Mapping an IDL Schema to Java
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Rather than manually converting an IDL schema to Java source code, we'll use a simple tool to automate the process This tool, idljexe, ships as standard with the Java 2 SDK v13 or higher for Windows Previous versions of the Java 2 SDK did not include the tool, and required you to download a program called idl2javaexe The reader is advised, if this hasn't been done already, to install the latest version of the Java 2 SDK for Windows further instructions presume that readers are able to run the idljexe program If you've already saved the lightbulb schema as LightBulbidl (preferably in a directory of its own), the next step is to generate the Java mapping, using idljexe Type the following command:
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idlj fall LightBulbidl
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You'll notice that we specify an extra parameter, fall You can specify that you want to generate only the client mapping by using fclient, and only the server mapping by using fserver For convenience, you'll usually do all mappings at once If you do a directory listing, you'll notice that there are quite a few new files These are stub and skeleton files, created automatically as part of the mapping process You should not modify these files directly; if you run the idlj program in the future your changes will be overwritten Instead, we'll use these classes as the scaffolding for a CORBA servant and a CORBA client
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1243 Writing the Servant Code
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Writing code to implement a CORBA service is fairly straightforward Most of the hard work has already been done, remember, by the IDL mapping tool When you define an interface, you'll get a variety of files The two most important ones for writing a servant are the following:
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