CODEWITHSUNDEEP
java
konsolas
konsolas

Reputation: 1091

Getting a class' constant pool programmatically

Lets say I have class Foo:

public class Foo {
    // ...
}

I want to get its constant pool as a byte array from another class. i.e:

public class Bar {
    void butts() {
        byte[] fooConstantPool = Foo.class.getConstantPool();
        // ...
    }
}

Class#getConstantPool is not part of the standard API. Is there any consistent way I can get another class' constant pool?

Upvotes: 0

Views: 855

Answers (2)

Stefan Reich
Stefan Reich

Reputation: 1110

You can scan your class loader to find the class's location on disk, then use a framework like BCEL to analyze it.

I have a website demonstrating this, but StackOverflow says I am not allowed to post links to it.

Upvotes: 0

dds
dds

Reputation: 2415

You can get it as sun.reflect.ConstantPool object via reflection like this:

import sun.reflect.ConstantPool;
public class Bar {
    private static final Method getConstantPool;

    static {
        try {
            getConstantPool = Class.class.getDeclaredMethod("getConstantPool");
            getConstantPool.setAccessible(true);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        }
    }
    void butts() {
        ConstantPool constantPool = (ConstantPool) getConstantPool.invoke(Foo.class);
        // ...
    }
}

but I'm not sure how to get it as byte array. You can try to serialize it :)

Upvotes: 2

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