Show TOC

Procedure documentationImplementing Logs in the HelloWorld Application Locate this document in the navigation structure

 

Use this procedure to implement log messages in the created HelloWorld application.

Prerequisites

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

Procedure

  1. In the Project Explorer, choose   HelloWorldEJB   ejbModule   com.sap.tutorial.helloworld  .

  2. Right-click com.sap.tutorial.helloworld and choose   New   Class  .

  3. In the Name field, enter a non-specific name, for example LogTest.

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

    Syntax Syntax

    1. 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”

  5. 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

    1. 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.

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

    Your updated code seems as follows:

    Syntax Syntax

    1. package com.sap.tutorial.helloworld;
import javax.ejb.Stateless;
import javax.jws.WebService;
 @WebService(endpointInterface="com.sap.tutorial.helloworld.HelloBeanRemote", 
portName="HelloBeanPort", serviceName="HelloBeanService", 
targetNamespace="http://sap.com/tutorial/helloworld/")
@Stateless(name="HelloBean")
public class HelloBean implements HelloBeanRemote, HelloBeanLocal {
   private String message = "Hello, ";
   public String sayHello(String name) {
	   LogTest.demonstrate();	   
   return message + name + ".";
      }
}
    End of the code.

  7. Save the current project.

Result

You have successfully entered the logging functionality.

Next step: Deploying the HelloWorld Application