Java getting the class path in the runtime

In some cases, you may need to know for debugging purposes from where a specific class is loaded. This happens usually if there are two different versions of the class in the class path (the one used in compilation is different from the one used in the runtime) which results in the popular java.lang.NoClassDefFoundError error).

Thanks to the ProtectionDomain, you can get this information as shown below.

try {
	Class myclass = Class.forName("org.apache.commons.logging.Log"); /*or any other class you wish*/
	System.out.println(myclass.getProtectionDomain().getCodeSource()
			.getLocation());

} catch (ClassNotFoundException e) {
	e.printStackTrace();
}
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About Hazem Saleh

Hazem Saleh has more than eleven years of experience in Cloud, Mobile and Open Source technologies. He worked as a software engineer, technical leader, application architect, and technical consultant for many clients around the world. He is an Apache PMC (Project Management Committee) member and a person who spent many years of his life writing open source software. Beside being the author of the "JavaScript Unit Testing" book, "JavaScript Mobile Application Development" book, "Pro JSF and HTML5" book and the co-author of the "Definitive guide to Apache MyFaces" book, Hazem is also an author of many technical articles, a developerWorks contributing author and a technical speaker in both local and international conferences such as ApacheCon North America, Geecon, JavaLand, JSFDays, CON-FESS Vienna and JavaOne. Hazem is an XIBMer, he worked in IBM for ten years. Now, He is working for Nickelodeon New York as a Mobile Architect. He is also an OpenGroup Master Certified Specialist.

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