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Questions tagged [jar]

A JAR file allows Java runtimes to efficiently deploy a set of classes and their associated resources. The elements in a JAR file can be compressed, which, together with the ability to download an entire application in a single request, makes downloading a JAR file much faster than separately downloading the many uncompressed files which would form a single Java Application. The package java.util.jar contains classes that read and write JAR files.

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Decompiling or modifying .exe file generated from .jar

I have one .exe file which is generated from .jar file but I'm not sure how it was made. I cannot open it with winrar or something. I need to modify it or just to decompile it. Any answer should be ...
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1answer
1k views

Reverse-obfuscated Java code [duplicate]

Any idea how to reverse obfuscated java code !?
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1answer
555 views

Reverse engineering Android device framework

I'm trying to get to an Android device framework source to perform static analysis on it. I'm specifically looking at a Samsung Galaxy S6 device with Android 5.1.1. I downloaded the firmware image, ...
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1answer
1k views

Java - Decipher encrypted classes in a jar file

I have a couple of classes that are encrypted. The class loader must decrypt these before executing in the JVM. The question is, how and where? What can I do to understand who is responsible to ...
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0answers
303 views

Jar reversing: Can't open as zip file nor open it with common decompilers

I'm pentesting a JNLP application composed by several .jar files. I'm able to decompile with jd-gui every 3rd party library included in it, but the main .jar coded by my client. So after running JD-...
6
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2answers
5k views

GUI for transforming Java Bytecode based on decompiled source?

Okay. So I've just come up with the most amazing program for java developers and reverse-engineerers and I was wondering if something like the following program already exists: What I'm thinking of ...
3
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1answer
1k views

Rename classes and packages in a jar file

I have an obfuscated jar file I'm trying to decompile and get into an eclipse project. I can easily view the "source" using a tool like jd-gui but I cant save it because the filenames are too long. I ...
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2answers
675 views

Patch a Java class inside a jar using C# [closed]

Being a beginner in C# I wonder if it is possible to patch a .class file inside a .jar? Since jar files tend to act like "zip" files, the approach I think might work is to decompress the jar, patch ...
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2answers
14k views

Get jar back from wrapped(into exe) jar

Is there any way to get a jar file from a jar wrapped using a exe wrapper. I have an exe file and I know that it was wrapper using exe wrapper (launch4j to be precise). How do I unwrap this jar to get ...
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7answers
88k views

What is a good Java decompiler and deobfuscator?

I am using JD-GUI to decompile Java JAR files, but the problem is that it leaves many errors, such as duplicate variables which I have to fix myself and check to see if the program still works (if I ...
16
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4answers
11k views

Checking if an .exe is actually a .jar wrapped in an .exe

Let's say I have a .jar file and wrap it into a .exe using any number of free utilities out there, like JSmooth. Would it be possible to tell, given just the .exe, if it was generated using one such ...