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= ROOT|Technical|Code_Examples|Java|launcher|java.c =

page 5 of 20



    }

    /* At this stage, argc/argv have the applications' arguments */
    if (_launcher_debug) {
	int i = 0;
	printf("Main-Class is '%s'\n", classname ? classname : "");
	printf("Apps' argc is %d\n", argc);
	for (; i < argc; i++) {
	    printf("    argv[%2d] = '%s'\n", i, argv[i]);
	}
    }

    ret = 1;

    /*
     * Get the application's main class.
     *
     * See bugid 5030265.  The Main-Class name has already been parsed
     * from the manifest, but not parsed properly for UTF-8 support.
     * Hence the code here ignores the value previously extracted and
     * uses the pre-existing code to reextract the value.  This is
     * possibly an end of release cycle expedient.  However, it has
     * also been discovered that passing some character sets through
     * the environment has "strange" behavior on some variants of
     * Windows.  Hence, maybe the manifest parsing code local to the
     * launcher should never be enhanced.
     *
     * Hence, future work should either:
     *	   1)	Correct the local parsing code and verify that the
     *		Main-Class attribute gets properly passed through
     *		all environments,
     *	   2)	Remove the vestages of maintaining main_class through
     *		the environment (and remove these comments).
     */
    if (jarfile != 0) {
	mainClassName = GetMainClassName(env, jarfile);
	if ((*env)->ExceptionOccurred(env)) {
	    ReportExceptionDescription(env);
	    goto leave;
	}
	if (mainClassName == NULL) {
	  const char * format = "Failed to load Main-Class manifest "
	                        "attribute from\n%s";
	  message = (char*)JLI_MemAlloc((strlen(format) + strlen(jarfile)) *
				    sizeof(char));
	  sprintf(message, format, jarfile);
	  messageDest = JNI_TRUE;
	  goto leave;
	}
	classname = (char *)(*env)->GetStringUTFChars(env, mainClassName, 0);
	if (classname == NULL) {
	    ReportExceptionDescription(env);
	    goto leave;
	}
	mainClass = LoadClass(env, classname);
	if(mainClass == NULL) { /* exception occured */
	    ReportExceptionDescription(env);
	    message = "Could not find the main class.  Program will exit.";
	    goto leave;
	}
	(*env)->ReleaseStringUTFChars(env, mainClassName, classname);
    } else {
      mainClassName = NewPlatformString(env, classname);
      if (mainClassName == NULL) {
	const char * format = "Failed to load Main Class: %s";
	message = (char *)JLI_MemAlloc((strlen(format) + strlen(classname)) * 
				   sizeof(char) );
	sprintf(message, format, classname); 
	messageDest = JNI_TRUE;
	goto leave;
      }
      classname = (char *)(*env)->GetStringUTFChars(env, mainClassName, 0);
      if (classname == NULL) {
	ReportExceptionDescription(env);
	goto leave;
      }
      mainClass = LoadClass(env, classname);
      if(mainClass == NULL) { /* exception occured */
	ReportExceptionDescription(env);
	message = "Could not find the main class. Program will exit.";
	goto leave;
      }
      (*env)->ReleaseStringUTFChars(env, mainClassName, classname);
    }

    /* Get the application's main method */
    mainID = (*env)->GetStaticMethodID(env, mainClass, "main",
				       "([Ljava/lang/String;)V");
    if (mainID == NULL) {
	if ((*env)->ExceptionOccurred(env)) {
	    ReportExceptionDescription(env);
	} else {
	  message = "No main method found in specified class.";
	  messageDest = JNI_TRUE;
	}
	goto leave;
    }

    {    /* Make sure the main method is public */
	jint mods;
=5=

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