Reading a jar file from resource location

Question

In my application I have to read a jar file available in the disk location and segregate .classes file from the jar.

Code is

 JarFile jarFile = new JarFile("./resources/CD.jar"); for(Enumeration<JarEntry> em = jarFile.entries(); em.hasMoreElements();) { String s= em.nextElement().toString(); ZipEntry entry = jarFile.getEntry(s); String fileName = s.substring(s.lastIndexOf("/")+1, s.length()); if(fileName.endsWith(".class")){ System.out.println(fileName); }

But I am getting an error

java.io.FileNotFoundException: .\resources\CD.jar (The system cannot find the path specified).

What do you mean by segregate? Do you mean that you want to list the file names inside .jar file only or you want to do something else? I can see that your code only displays the name — mustangDC
– mustangDC, Commented Jun 12, 2015 at 5:45

viveknaskar · Accepted Answer · 2019-12-26 09:20:57Z

I found a solution to my problem:

Add the 'resource' location to the classpath
Allow external service API to place cd.jar in resources location

Using a child class loader add the cd.jar to the classpath code snippet is given below:

URLClassLoader childLoader = new URLClassLoader(new URL[] { getURLOfTestclass() }, this.getClass().getClassLoader()); URL url = getClass().getClassLoader().getResource("CD.jar"); return url;

NilZzz · Accepted Answer · 2015-06-12 05:57:32Z

0

Did you try adding the CD.jar file in your classpath? I would try doing that once.

answered Jun 12, 2015 at 5:57

NilZzz

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2 Comments

nom Over a year ago

I don't think this would make any difference.

Anoop M Nair Over a year ago

This jar file is not in my class path.External service placed that file in this location

nom · Accepted Answer · 2015-06-12 06:01:45Z

0

Change ".\resources\CD.jar" to a fully qualified URI. Eg:C:\Users\Whoever\Documents\resources\CD.jar.

answered Jun 12, 2015 at 6:01

nom

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2 Comments

Anoop M Nair Over a year ago

But then it wont work for general purpose, that is if I want to run my application in linux machine I have to change the code. Isn't it?

nom Over a year ago

@ANP Precisely. A solution to that would be keeping cd.jar in the same folder as your application.

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