CODEWITHSUNDEEP
javajava-mejarjvm
anupsth
anupsth

Reputation: 687

how to know which class / package/ methods used by given jar file?

I have a jar file. I want to know which external classes and methods are used by classes inside JAR file. Can anyone suggest me any tool?

For example - if below two classes are packaged into Myjar.jar

import java.util.Vector;
class MyJarClass{

    public static void main(String args[]){
        Vector v = new Vector();
        AnotherClass another = new AnotherClass();

        v.addElement("one");
        another.doSomething();

    }
}

class AnotherClass{

    void doSomething(){
    }
}

When I supply that JAR to a tool - the tool should show java.util.Vector and Vector.adElements() are from external source (not present in MyJar.jar)

Forgot to mention, i don't have access to sourcecode.

Upvotes: 6

Views: 2006

Answers (4)

Enrico Sasdelli
Enrico Sasdelli

Reputation: 11

Check untangle

It's a small cli utility that searches usages of class or packages inside jars or directories containing classes.

Disclaimer: I'm the author of untangle

Upvotes: 1

Andreas Dolk
Andreas Dolk

Reputation: 114767

Easy

import com.example.*;

Possible

List<com.example.MyType> = new ArrayList<com.example.MyType>();

A challenge

Class<?> clazz = Class.forName("com.example.MyType");

Mission impossible

List<String> classes = getClassNamesFromUrl("http://example.com/classes.txt");
for (String className:classes) {
   doSomethingWith(Class.forName(className));
}

I support Jon's advice to look at the byte code (BCEL) but just be aware, that in general it is not possible to read all dependencies from a jar, as they can be dynamic and defined outside the library (see: Mission impossible).

Hard to tell if there's a tool, have a look at those directories on java-source.net:

Further reading

Upvotes: 5

stacker
stacker

Reputation: 68962

Check JDepend

The graphical user interface displays the afferent and efferent couplings of each analyzed Java package, presented in the familiar Java Swing tree structure.

Upvotes: 0

Jon Skeet
Jon Skeet

Reputation: 1500525

You might want to look at BCEL, which will allow you to parse the class files and find out what they use. I expect it'll be a certain amount of effort though.

Upvotes: 3

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