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02.21.2008 at 05:26AM PST, ID: 23180965
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Get application name.

Tags: Java
Hi All,

I would like to work out a way of reliably getting the name of the application from inside a utility package.

In package 'utils' I need a method getAppName that returns the name of the app. This will be used for naming folders and log files etc. This naming will be done by other tools in the utils package. I have the enclosed code that collects the name of the jar but it wont work under debug where the utilities package is accessed through source rather than jar.

One technique I have seen is to create an exception, pull out a stack trace from it and walk through it. Doing this in a static object would allow me to get in at <Init> time but this doesn't seem to work. The app name does not appear anywhere reliably.

Thanks in advance.

Paul
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public static String getAppName() {
	// Assume we are in the same jar as the main class.
	// We are likely to be as these utils should be packaged in the jar.
	URL url = ClassUtils.getLocation(VersionUtils.class);
	System.out.println("URL: "+url.toString());
	File file = new File(url.getFile());
	String name = file.getName();
	System.out.println("Name: "+name);
	if ( name.toLowerCase().endsWith(".jar") ) {
	    name = name.substring(0, ".jar".length());
	} else {
	    if ( name.toLowerCase().equals("classes") ) {
		// Its source.
	    }
	}
	System.out.println("AppName: "+name);
	return name;
    }
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Question Stats
Zone: Programming
Question Asked By: PaulCaswell
Solution Provided By: cmalakar
Participating Experts: 2
Solution Grade: A
Views: 4
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02.21.2008 at 05:42AM PST, ID: 20947587

Rank: Guru

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02.21.2008 at 06:13AM PST, ID: 20947813

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02.21.2008 at 06:20AM PST, ID: 20947909

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02.21.2008 at 06:27AM PST, ID: 20947983

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02.21.2008 at 05:42AM PST, ID: 20947587

Rank: Guru

When running on a Sun VM you could use the undocument VMSupport class:

String cmd = sun.misc.VMSupport.getAgentProperties().getProperty("sun.java.command");

This will give you the actual java command used to launch the application.
 
02.21.2008 at 06:13AM PST, ID: 20947813

Rank: Guru

Will this be useful..

 ThreadMXBean  temp = ManagementFactory.getThreadMXBean();
 ThreadInfo t = temp.getThreadInfo(1, Integer.MAX_VALUE);
 System.out.println("Name: " + t.getThreadName());
 StackTraceElement st[] = t.getStackTrace();
 System.out.println("Main Class Name: " + st[st.length - 1].getClassName());

This prints the Main Class Name..

This can be executed only in jdk 1.6
Accepted Solution
 
02.21.2008 at 06:20AM PST, ID: 20947909
Thanks both,

Sorry, not running under sun VM.

Sorry, need to be JVM 1.5 compatible and, if possible, 1.4.

Any more ideas?

Paul
 
02.21.2008 at 06:27AM PST, ID: 20947983

Rank: Guru

Sorry.. My code works from 1.5 onwards..
 
 
02.21.2008 at 07:14AM PST, ID: 20948417
cmalakar,

Perfect!

I am guessing this grabs a stack crawl of the current thread and pulls the name of the class out of the bottom of the stack. Cute. :)

Paul
 
 
02.21.2008 at 09:36PM PST, ID: 20954927
>> I am guessing this grabs a stack crawl of the current thread

It is not actually current thread, It is the stack trace of the *main* thread..
 
 
 
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