This question already has answers here:
Java obfuscators [closed]
(6 answers)
Closed 7 years ago.
I have made a jar file for a software that I need to use. The problem is that since it is a jar file, anyone can get .class files and decompile them to get the actual java code.
Could some one please point out how to keep this java code secure. I have tried converting this jar to exe using launch4j but noticed that it just packs everything to exe. This exe can be extracted and then decompiled to get the actual java code.
I just need code to be secure, whether by converting to exe or by any other method. Please help.
Thanks in advance
What you need is Java Code obfuscator which will change the Java code without changing the actual functions.
Check ProGuard which does that.
Related
This question already has answers here:
JAR hidden inside EXE?
(5 answers)
Closed 8 years ago.
I've always wondered how, on Windows, Minecraft has an exe file that will work, You can also change the file extension to .jar and run it like a normal jar file as well, Any ideas on how they have accomplished this?
I've searched all over google and haven't found any answers. Unless I'm just searching the wrong thing, I would like to know how to package my JARs like this!
Thanks!
They use a program called launch4J to wrap the jar into an exe. As you can see the program here http://launch4j.sourceforge.net/. This is apparent when you run minecraft with No java installed you will see a message box from launch4j saying that you need to install java. Note the java code is not converted to native windows code just launched natively.
This question already has answers here:
Closed 10 years ago.
Is there is any converter which convert our compiled .class (Abc.class) into .java(Abc.java). If we can do so then how we called as Java is secure language. Is there is any other way to convert our class into .java file
Am raising the question about the java security also please note that
thank you all
There are tools to decompile .class files, such as JAD http://en.wikipedia.org/wiki/JAD_(JAva_Decompiler)
In that sense, I wouldn't say java is secure if you're distributing your class files. However, there are measures you can take such as using an obfuscator such as ProGuard (http://proguard.sourceforge.net/)
This question already has answers here:
How can I convert my Java program to an .exe file?
(16 answers)
Closed 7 years ago.
How would I make a .JAR file open up when I make another file as .EXE?
I have tried many things, but they don't work.
I want this for another way to protect my source code. Kind of like what Minecraft does. You open a .EXE, and somehow the .EXE opens up the .JAR file.
Anyone have any ideas?
To convert to exe, I use JAR2EXE.
However obfuscating your code can deter people who want to access your code. But a determined person would still access it. You can use proguard to obfuscate your code.\
ProGuard
You want something like this:
-> http://en.wikipedia.org/wiki/Obfuscated_code
You can access the MineCraft.jar but the code is obfuscated.
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
How can I convert my Java program to an .exe file?
How can i create Exe file for java program. Do i need to install any software for it, And how to add Icon to that exe file.
Use known tools: JSmooth, LaunchAnywhere, JexePack
It's difficult. JDK could not do that, you need a third tool to do that. please refer http://www.duckware.com/jexepack/index.html.
Why do you need to do that? maybe you should use c#/vb to program.
You can but this wouldnt be a real EXE, you will still need to install the JVM to run your app. try jstart32.
This question already has answers here:
Closed 11 years ago.
Possible Duplicates:
Where can I find a Java decompiler?
How to decompile a whole Jar file?
I have a .jar file. Its a single file, but I want to "decompile" it to get at the original java code (or at whatever would be closest to the Java code - something I could understand, and edit). I believe my file is (specifically) a java applet, but its saved as an executable jar file (.jar).
How would I do such a thing?
Take a look at Java Decompiler.
It allows you to decompile jar files with the JD-GUI and browse the class files as source.
Here is another stackoverflow question.