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.
Related
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.
This question already has answers here:
Java creating .jar file
(5 answers)
Closed 8 years ago.
I decompile jar file using jd-gui app. I made some changes on it.
After that i try to compile main.java file which one include all packages & other java files.
Then it Shows classnotfound exception.
I need to it without using any IDE.
Please Help me.
Thanks in advance.
A JAR (http://en.wikipedia.org/wiki/JAR_%28file_format%29) file is a ZIP-compatible archive of your compiled classes and other binary resource.
Feel free to unpack/pack it or treat it the way you treat ZIP-archive, say using your favorite archiving tool, like 7zip.
You can even create a ZIP archive with the contents you wish your JAR to contain and simply change the file extension to .jar.
NOTE: in case you use compression for your ZIP-archive, because in that case your manifest often must be the first entry in the archive.
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 exists:
Closed 12 years ago.
Possible Duplicate:
Where can I find a Java decompiler?
Can anyone tell me how i can convert jar file to it's corresponding .java source file?
I have jar file from unknown source. Is it possible to get the corresponding .java source file out of jar?
You can use java decompiler
In principle you can decompile any jar file, by using ,for example, JAD
http://en.wikipedia.org/wiki/JAD_%28JAva_Decompiler%29
But if the jar was obfuscated the result may not be very pretty. ;)
My fav decompiler is cavaj, you can download from the following url
http://cavaj-java-decompiler.en.softonic.com/
Normally are in a "jar" archive only the compiled Java files (". class"). But you could theoretically try to decompile these files.
Here you'll find e.g. a decompiler
This question already has answers here:
How to make a JAR file that includes DLL files?
(2 answers)
Closed 9 years ago.
I have a third party library that comes with .dll files that I need in order to run my java jar file. How can I include them in my jar file when I deploy my application? (I am using JSmooth to create an exe file - if that helps anything)
NOTE: I have looked at this stackoverflow question, but there's only one answer there, and I don't think it will work for me.
Thanks so much!
this has come up before. the short answer is that you cant - the dll has to be accessible to the underline OS and so cannot be inside the jar.
it can, however, be unpacked from within the jar to somewhere in the PATH before you call loadLobrary ....
look here : How to make a JAR file that includes DLL files?