Java Reference
In-Depth Information
The HelloInterceptor class defines an @AroundInvoke interceptor method,
modifyGreeting , that converts the string passed to HelloBean.setName to
lowercase.
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@AroundInvoke
public Object modifyGreeting(InvocationContext ctx) throws Exception
{
Object[] parameters = ctx.getParameters();
String param = (String) parameters[0];
param = param.toLowerCase();
parameters[0] = param;
ctx.setParameters(parameters);
try {
return ctx.proceed();
} catch (Exception e) {
logger.warning("Error calling ctx.proceed in modifyGreet-
ing()");
return null;
}
}
The parameters to HelloBean.setName are retrieved and stored in an Object array
by calling the InvocationContext.getParameters method. Because setName
has only one parameter, it is the first and only element in the array. The string is set
to lowercase and stored in the parameters array, then passed to InvocationCon-
text.setParameters . To return control to the session bean, InvocationCon-
text.proceed is called.
The user interface of interceptor is a JavaServer Faces web application that consists
of two Facelets views: index.xhtml , which contains a form for entering the name, and
response.xhtml , which displays the final name.
Running the interceptor Example
You can use either NetBeans IDE or Ant to build, package, deploy, and run the inter-
ceptor example.
To Run the interceptor Example Using NetBeans IDE
1. From the File menu, choose Open Project.
2. In the Open Project dialog, navigate to tut-install /examples/ejb/ .
3. Select the interceptor folder and click Open Project.
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