use different non-zero exit codes

Author: tofi86

src/universalJavaApplicationStub

@@ -225,7 +225,7 @@ elif [ ! -z ${JVMVersion} ] && [ -x /usr/libexec/java_home ] ; then
 		# display error message with applescript
 		osascript -e "tell application \"System Events\" to display dialog \"ERROR launching '${CFBundleName}'\n\nNo suitable Java version found on your system!\nThis program requires Java ${JVMVersion}\nMake sure you install the required Java version.\" with title \"${CFBundleName}\" buttons {\" OK \"} default button 1 with icon path to resource \"${CFBundleIconFile}\" in bundle (path to me)"
 		# exit with error
-		exit 1
+		exit 3
 	fi
 
 # otherwise check "/usr/libexec/java_home" symlinks
@@ -256,7 +256,7 @@ if [ -z ${JVMMainClass} ]; then
 	# display error message with applescript
 	osascript -e "tell application \"System Events\" to display dialog \"ERROR launching '${CFBundleName}'!\n\n'MainClass' isn't specified!\nJava application cannot be started!\" with title \"${CFBundleName}\" buttons {\" OK \"} default button 1 with icon path to resource \"${CFBundleIconFile}\" in bundle (path to me)"
 	# exit with error
-	exit 1
+	exit 2
 
 
 # check whether $JAVACMD is a file and executable