How to bypass accessDeclaredMembers permission as applet?

Question

I used some code from another question to access the private field "classes" in the Java ClassLoader. This works fine, however when I move it to an applet it gets messed up with this exception: access denied (java.lang.RuntimePermission accessDeclaredMembers). I've done some searching and tried using PrivlegedExceptionAction to skip that, but it isn't working. So my question is this: is is possible to bypass this, and if not what is another way to get a list of classes?

Reflection Code:

final ClassLoader cLoader = getClass().getClassLoader();
            final Field f = ClassLoader.class.getDeclaredField("classes");
            AccessController.doPrivileged(new PrivilegedExceptionAction() {
                    public Object run() throws Exception {
                        f.setAccessible(true);
                        return null;}});
            Vector<Class> classes = (Vector<Class>)f.get(cLoader);
            cList.addAll(classes);

@jérôme This question (stackoverflow.com/questions/2681459/…) — Octavia Togami
– Octavia Togami, Commented Sep 6, 2012 at 15:04
What are you trying to achieve using this and Greenfoot? You can't do this on an applet if you expect it to go on greenfoot.org, but depending on your task there may be another way. — Michael Berry
– Michael Berry, Commented Oct 8, 2012 at 14:13
This is for a request someone made, I'm trying to get it to work. — Octavia Togami
– Octavia Togami, Commented Oct 8, 2012 at 22:29

Andrew Thompson · Accepted Answer · 2012-09-06 22:28:50Z

2

Digitally sign the applet code (then get the user to accept it when prompted) to gain full privileges.

answered Sep 6, 2012 at 22:28

Andrew Thompson

169k42 gold badges224 silver badges441 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Octavia Togami Over a year ago

Sorry I forgot to mention this but I am using greenfoot to do this (it has to be done in this program) and I cannot make a digital signature unless I could do it programmatically.

Andrew Thompson Over a year ago

(shrugs) Whether it is 'greenfoot' or paper, glue & sparkles used to make the applet does not matter. The answer to your question remains the same.

Octavia Togami Over a year ago

I can't make a digital signature because I am not in control of the upload.

Brian Knoblauch Over a year ago

I'm having the exact same problem with an app that is digitally signed, what do you recommend in that case?

Andrew Thompson Over a year ago

@BrianKnoblauch I recommend you ask your own question, link to this one, and explain the differences. Name the exact JRE version this occurs in. Security has been tightened in recent times/JREs.

Collectives™ on Stack Overflow

How to bypass accessDeclaredMembers permission as applet?

1 Answer 1

5 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related