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Implementing Logs in the HelloWorld ApplicationLocate this document in the navigation structure

Prerequisites

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

Context

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

Procedure

  1. In the Project Explorer , choose Start of the navigation path HelloWorldEJB  Next navigation step ejbModule Next navigation step com.sap.tutorial.helloworld End of the navigation path.
  2. Right-click and choose Start of the navigation path New Next navigation step Class End of the navigation path.
  3. In the Name field, enter a non-specific name, for example LogText and choose Finish .
  4. In the LogText.java editor, replace the content with the following code sample:
    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");
             }
}

    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:
    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 will be traced with the exception stack trace...", e); 
}
  6. Save the editor.
  7. In the HelloBean.java window, insert the code line LogText.demonstrate(); .

    Your updated code seems as follows:

    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) {
           LogText.demonstrate();          
   return message + name + ".";
      }
}
  8. Save the current project.

Results

You have successfully entered the logging functionality.

Next Steps

Next step: Deploying the HelloWorld Application