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6.2.5. Customizing Internationalized Exceptions

6.2.5.1. Add Message Ids and Project Codes to Exception Messages
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The following procedure shows the steps required to add message IDs and project codes to internationalized Exception messages created using JBoss Logging Tools.
Message IDs and project codes are unique identifiers that are prepended to each message displayed by internationalized exceptions. These identifying codes make it possible to create a reference of all the exception messages for an application so that someone can lookup the meaning of an exception message written in language that they do not understand.

Prerequisites

  1. You must already have a project with internationalized exceptions. Refer to Section 6.2.2.3, “Create Internationalized Exceptions”.
  2. You need to know what the project code you will be using is. You can use a single project code, or define different ones for each interface.

Procedure 6.10. Add message IDs and project codes to exception messages

  1. Specify a project code

    Specify the project code using the projectCode attribute of the @MessageBundle annotation attached to a exception bundle interface. All messages that are defined in the interface will use that project code. 
    @MessageBundle(projectCode="ACCTS")
interface ExceptionBundle
{
   ExceptionBundle EXCEPTIONS = Messages.getBundle(ExceptionBundle.class);
}
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  2. Specify message IDs

    Specify a message id for each exception using the id attribute of the @Message annotation attached to the method that defines the exception. 
    @Message(id=143, value = "The config file could not be opened.")
IOException configFileAccessError();
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Important

A message that has both a project code and message ID displays them prepended to the message. If a message does not have both a project code and a message ID, neither is displayed.

Example 6.3. Creating internationalized exceptions

This exception bundle interface has the project code of ACCTS, with a single exception method with the id of 143. 
@MessageBundle(projectCode="ACCTS")
interface ExceptionBundle
{
    ExceptionBundle EXCEPTIONS = Messages.getBundle(ExceptionBundle.class);

    @Message(id=143, value = "The config file could not be opened.")
    IOException configFileAccessError();
}
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The exception object can be obtained and thrown using the following code. 
throw ExceptionBundle.EXCEPTIONS.configFileAccessError();
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This would display an exception message like the following: 
Exception in thread "main" java.io.IOException: ACCTS000143: The config file could not be opened.
at com.company.accounts.Main.openCustomProperties(Main.java:78)
at com.company.accounts.Main.go(Main.java:53)
at com.company.accounts.Main.main(Main.java:43)
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