IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Tracing Java applications and the JVM > Application trace > Implementing application trace

Example HelloWorld with application trace

This code illustrates a "HelloWorld" application with application trace.

For more information about this example, see Using application trace at run time.

import com.ibm.jvm.Trace;
public class HelloWorld
{
   static int handle;
   static String[] templates;
   public static void main ( String[] args )
   {
      templates = new String[ 5 ];
      templates[ 0 ] = Trace.ENTRY          + "Entering %s";
      templates[ 1 ] = Trace.EXIT           + "Exiting %s";
      templates[ 2 ] = Trace.EVENT          + "Event id %d, text = %s";
      templates[ 3 ] = Trace.EXCEPTION      + "Exception: %s";
      templates[ 4 ] = Trace.EXCEPTION_EXIT + "Exception exit from %s";

      // Register a trace application called HelloWorld
      handle = Trace.registerApplication( "HelloWorld", templates );
      
      // Set any tracepoints that are requested on the command line
      for ( int i = 0; i < args.length; i++ )
      {
         System.err.println( "Trace setting: " + args[ i ] );
         Trace.set( args[ i ] );
      }
      
      // Trace something....
      Trace.trace( handle, 2, 1, "Trace initialized" );
      
      // Call a few methods...
      sayHello( );
      sayGoodbye( );
   }
   private static void sayHello( )
   {
      Trace.trace( handle, 0, "sayHello" );
      System.out.println( "Hello" );
      Trace.trace( handle, 1, "sayHello" );
   }

   private static void sayGoodbye( )
   {
      Trace.trace( handle, 0, "sayGoodbye" );
      System.out.println( "Bye" );
      Trace.trace( handle, 4, "sayGoodbye" );
   }}

Parent: Implementing application trace

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