Converting class files into java source codes

Dear Friends,
It is true that conversion of class files to its java source codes is possible through some software. I want to know, is there any way to protect my java source codes from viewing or copying illegally by other persons ?
If I create JAR file from java files, can it be also convertible back to source codes ?
Avi

You can use code obfuscators in order to protect your code. And yes a jar file can also be decompiled.
http://www.retrologic.com/
http://www.2lkit.com/products/2LKitObf/
http://www.codingart.com/codeshield.html
http://www.drjava.de/obfuscator/

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How to convert class file to Java source code ?

Hi All ,
Currently am working in Peoplesoft Demo project using java as Plug in.We have only the class files and jar files and we have planned to modify the code for future enhancements.We dont have any legal issues here as we are already working with our client for the original source code.
Kindly help me out in doing this reverse engineering process.We have come to know the below steps would help us out.Can someone guide us in acheiving this process step by step.Please add your experience here and let us know what are the other steps required ..
(1)Rename the file from .jar to .zip and extract the .zip file.
(2)Decompile the desired .class file using 3rd party tool and get .java file.
(3)Modify the .java file and compile it.
(4)Now zip the extracted files and rename the it from .zip to .jar.
We need to verify whether the modified .jar file will work
Thanks & Regards
Kar1983

Thanks for your reply ....We have asked them so many times ..but they say they dont have it .Since we have planned to do some enhancements from our end we have planned to do reverse engineering process.

How to convert class files into java files??

Hey Guys,
I need a little help.
I want to know wheather we can view .class files as .java files or convert the .class to .java files.Is ther any tool or software for doing that.
Or in other words can i see the source code of any .class file..??
Plz do tell me if we can do that or any other way we can do that.
Regds,
Gokul

Sort of. A "decompiler" will take a class file and generate a source code file of source code that could be compiled to get the class file you started out with. However, it won't be the same source code that was originally used to create the class. Most notably, comments will be missing, and variable names will probably be meaningless.
And before you say "java is bad because you can decompile it", note that any language that you can execute you can theoretically decompile.
Also, you can view the raw byte codes. If you're familiar with assembly language, or better yet familar with java bytecodes and the JVM in particular, you can often find out what a particular method does just by viewing the byte codes.

Convert .class files into .java files???

Does anybody know how to convert x.class file back to a x.java file. Or in other terms, extract .java files from a jarfile??
Thanks for any help
/carlos

Does anybody know how to convert x.class file back to a x.java file.As Dr.Clap said, that's decompiling.
Or in other terms, extract .java files from a jarfile??That isn't quite the same thing. You can decompile a .class that's in a jar, but a .class file doesn't have to be in a jar and a file in a jar isn't necessarily a .class.

How to convert a .class file into .java file without .jad using DeJDecompil

Hi all,
I am using DeJDecompiler and working with swing applications.If I try to convert a .class file into .java file,it is converting into .jad file only.Fine but if I try to save that file into .java file,It is giving lot of errors in that program.When I went into that program the total style of the program is changed and TRY-CATCH block is not recognised by the dejdecompiler,hence If I try to include some methods in the existing .java file thus got,I could not do.Kindly help me.
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With kind Regs
Satheesh.K

Not so urgent today then!
http://forum.java.sun.com/thread.jsp?thread=553576&forum=31&message=2709757
I'm still not going to help you to steal someone�s code.

Again,HOW to conver a .class file into .java one?

sorry , but Can't u send me a specific link for downloading this "Java decomplier"??
coz I found my self in something called (jad decompiler) with lots of versions and this is confusing
and Is that mean, that there's a decompiler which can convert the .class file into .java one?
and thanks alot man.....u help me always!
(I'm still begginner in java)

Just to emphasise what yawmark said...
Decompiled java code is NEVER going to be as clear as well-written original java source code. The decompiler can see what the compiled code does but not why or what it means, so the source code that the decompiler produces is going to be ugly and hard to read. Decompilers are really only useful for experienced programmers who know what to infer, how to read between the lines...
If you need help writing something, then you're better off looking at tutorials. In tutorials the code will be well-commented.

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Hi..
I am currently working on Internationalization. I have created property files for the textual content and using PropertyResourceBundles. Now I want to use ListResourceBundles. So what I want to know is..
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How to decompile a .class file into .java file using DEJDecompiler?

Hi all,
I am using DeJDecompiler and working with swing applications.If I try to convert a .class file into .java file,it is converting into .jad file only.Fine but if I try to save that file into .java file,It is giving lot of errors in that program.When I went into that program the total style of the program is changed and TRY-CATCH block is not recognised by the dejdecompiler,hence If I try to include some methods in the existing .java file thus got,I could not do.Kindly help me.
If I get the .java file without error then I can process the rest of the functionality.
Thanks in advance
With kind Regs
Satheesh.K

Not so urgent today then!
http://forum.java.sun.com/thread.jsp?thread=553576&forum=31&message=2709757
I'm still not going to help you to steal someone�s code.

How to convert .class files to .java files

Hi,
I want to convert .class files to .java files. Is there is any software for that doing except Dj DCompiler? Because if i am using this i am not getting proper code i mean as it is available in the file.
I tried by writing simple java file and i compiled Sample.java file and i got a .class file then i converted this Sample.class to Sample.java file by using DjDcompiler but i was missing some statements i need entire code that is available in Sample.java file. Please tell me any other software for that doing.
Thank you in advance

I want to convert .class files to .java files.
iles. Is there is any software for that doing except
Dj DCompiler? Because if i am using this i am nothttp://www.google.com/search?hl=en&q=java+decompiler&meta=
getting proper code i mean as it is available in the
file.I doubt you ever will.
I tried by writing simple java file and i compiled
Sample.java file and i got a .class file then i
converted this Sample.class to Sample.java file by
using DjDcompiler but i was missing some statements i
need entire code that is available in Sample.java
file. Please tell me any other software for that
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How can i decode .class file into .java file?
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sekhar145 wrote:
How can i decode .class file into .java file?by using a decompiler
JAD is a known one , i am sure there are other on the internet, use you favourite search engine on Java Decompiler
can any one suggest the same?by using a decompiler
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I have made a simple calculator using swing.now i want it to be used as an application from the desktop..How can i do it?..any suggestions?

raghu0007 wrote:
I have converted the class file to jar using jar cvf simplecalci.jar simplecalci.class.
Now i don't know wat to do next since when i double click the jar.....windows shows the message
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For Windows XP
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I am working on EBS R12.
I have one class which I want to decompile. Change its code and transfer it back to server.
But when I am decompiling using JAD or any other tool, it is decompiling with error and thats why I am not able to compile it.
Please help me to generate .java form .class and convert that .java into .class again.
Ex: while decompilation, in finally block, some weird things are happing and GOTO statement is looking like goto _L0.
This is the only errror which I am getting while compilation.
finally
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}

hi
these are very wrong steps ,u can not change the oracles standard files like this,controllerextension is proper way to do the changes ,pls follow thw OA devguide ,also no decompilere can decompile the class fully correct ,many times it is not possible to compile again the decompiled class.
tahxn
Pratap

Converting class files into java source codes

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