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public class MessageBean implements MessageDrivenBean, MessageListener { private MessageDrivenContext ctx; public void onMessage(Message msg) { MapMessage map = (MapMessage) msg; String symbol = null; String description = null; ErrorHome errorHome = null; try { symbol = map.getString("Symbol"); description = map.getString("Description"); System.out.println("Received Symbol : " + symbol); System.out.println("Received Description : " + description); processEquityMessage( symbol, description ); } catch(Exception e){ e.printStackTrace(); System.out.println("Error Creating Equity with Symbol:"+symbol); System.out.println("Consuming error and " + "passing on to error Handler"); try{ handleError( e, msg ); } catch(Exception errorExc){} } } private void handleError( Exception e, Message msg ) { ErrorHandler handler = lookupErrorEJB(); handler.handleMessageDrivenError( e.getMessage(), msg ); } }

One last use of external variables being passed to awk is related to potential problems with awk versions. In some cases, the versions of awk, nawk, or gawk handle the -v switch differently. There are also issues when passing variables that have spaces included in literal strings. Most awk commands from the command line are contained within single quotes: '. When passing external shell variables to awk, in the space within the awk command where the variable containing spaces would normally be applied you should embed the shell variable directly into the command by surrounding it with more single quotes. In the following example, the awk command starts with a single quote and then begins a for loop. The counter variable i is set to the initial value of 3 and will continue to loop while i is less than or equal to $end. $end is a shell variable that is embedded between two single quotes. The first of these quotes ends the initial awk statement and the shell is then used to expand the value of the $end variable. The second single quote that follows the $end variable reopens the awk command, which includes the loop increment value as well as the print statements. The final single quote ends the whole awk statement. This example is very simple and nearly the same as the range-printing solution. It illustrates the use of a shell variable within an awk command. The differences are that the ending variable ($end) is passed from the shell environment and it is not contained within the single quotes of the awk command. The shell variable $end is set to the value 6.

compile the report prior to use. Similar to JSPs, it will do this the first time it encounters a new report and then cache the resultant .jasper file. To do this, however, you need to make the jdt-compiler.jar available to your application and configure the JRCompiler accordingly. As such, it s recommended only for development environments. For production, you can precompile your reports using an Ant task provided with Jasper and deploy the compiled versions instead.

The handleError() method looks up a session EJB that handles specific errors. For example, the following remote interface could expose error-handling functionality to an entire EJB application:

echo $VAR | awk '{for(i=3; i<='$end'; i++) {printf "%s ",$i}; print ""}'

provide support for conversation invalidation at the time of writing. This will likely be added in a future release of Spring Web Flow.

public interface ErrorHandler extends javax.ejb.EJBObject { public void handleMessageDrivenError( String message, Message mg ); public void handleSessionError( Object errorMessage ); public void handleEntityError( Object errorMessage ); }

Here is the output:

In 11 we took a brief look at the various constructs within Spring Web Flow, such as the flow, states, and transition elements, and this section will explore them again in more detail. Table 12-7 recalls the different types of states.

The message-driven EJB shown in the recipe processes messages containing equity information. The actual message-processing logic is not shown, so instead let s examine the handleError() method invoked only when an exception occurs during message processing. The session EJB interface shown in the recipe declares methods for handling different types of errors. For example, the session bean has a specific way it can handle session bean errors, entity bean errors, and messagedriven bean errors. Using an error-handling system like this does not have to take the place of a normal transactional system. Instead, it acts as a way to store information on errors occurring in your application acting as a logger of errors, and possibly offloading them to a management system.

The length value in awk is another internal variable that contains the number of characters in the current line.

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