Implementing Logs in the HelloWorld Application

Prerequisites

You have successfully exposed the HelloWorld EJB as a Web Service.

Procedure

In the Project Explorer, choose HelloWorldEJB ejbModule com.sap.tutorial.helloworld .
Right-click com.sap.tutorial.helloworld and choose New Class .
In the Name field, enter a non-specific name, for example LogTest.

In the empty class window, enter the following code sample:

Syntax Syntax

package com.sap.tutorial.helloworld;
import com.sap.tc.logging.Location;
import com.sap.tc.logging.Category;
import com.sap.tc.logging.Severity;
import com.sap.tc.logging.SimpleLogger;
public class LogTest {
   private static final Location loc = Location.getLocation(Location.getLocation("log.test"));
   public static void demonstrate() {
	SimpleLogger.log(Severity.INFO, Category.SYS_SERVER, loc, "api:ab0200", 
         "Component LogRecommendations started");
             }
}

End of the code.

Using this code, the application will output the INFO message:

“Component LogRecommendations started”

If you want some more details to be logged (with exception), for example a timer, add the following code sample in the end:

Syntax Syntax

try { //do something to be logged
           } catch (Exception e) {  
               SimpleLogger.log(Severity.ERROR, Category.SYS_SERVER, loc, "api:ab0201", 
"Problem communicating with DB during demonstrating LogExamples. 
 See traces for specific details. "); 
               SimpleLogger.traceThrowable(Severity.ERROR, loc, "a relevant meaningful message.
But not an ex.getMessage() because an exception message will be 
traced with the exception stack trace...", e); 
}

End of the code.

In the HelloBean.java window, insert the code line LogTest.demonstrate();.

Your updated code seems as follows:

Syntax Syntax

package com.sap.tutorial.helloworld;
import javax.ejb.Stateless;
import javax.jws.WebService;
 @WebService(endpointInterface="com.sap.tutorial.helloworld.HelloRemote", 
portName="HelloBeanPort", serviceName="HelloService", 
targetNamespace="http://sap.com/tutorial/helloworld/")
@Stateless(name="HelloBean")
public class HelloBean implements HelloRemote, HelloLocal {
   private String message = "Hello, ";
   public String sayHello(String name) {
	   LogTest.demonstrate();	   
   return message + name + ".";
      }
}

End of the code.

Save the current project.

Result

You have successfully entered the logging functionality.

Next step: Deploying the HelloWorld Application