I have an exe that I know was written in java. I understand that java programs can be made into an exe and there are tools to convert jar files to exe but is it possible to convert back? AFAIK jar files can be run on any platform that can run java and I would like to use a windows compiled java program on mac without using any extra virtualisation (wine,vmware)
It depends how the exe has been built:
If it has simply wrapped, with a tool like JSmooth, the same tool can extract the jar
If it it has been compiled, with for instance gcj (as illustrated by this question),... I am not sure.
If it has been compiled by a static compiler (or AOT - Ahead-Of-Time -), I believe it is not possible to extract the orignial jars.
If your application was wrapped using JSmooth, you can look in your default temp directory (C:\Documents and Settings\Username\Local Settings\Temp) while the application is running.
Open a windows explorer window to the temp dir, then start up your application. You should see a jar file show up (Temp#.jar). Just make a copy of this and you should be on your way.
i suggest just rename your file extension from .exe to .jar and try to extract them.
to view the code use java Decompiler LIKE:
http://java-decompiler.github.io
It is possible to convert file.exe back to file.jar , To go with this reversing process to will require you to know how the file was beeen encrypted ,for example if is the first level encryption class name and files are not hidden , for the second level file classes are hidden , for the 3rd level file and classes are hidden . to get this well download jar to exe software and try how they convert jar to exe then you will be able to know the reverse. to know how you proceed with reversing the process there is a single blog which helped me and all tools you may use are listed there like : Resource Hacker
Winhex
Ollydbg 1.10+ MemoryDump 0.9 and Olly Advanced or StrongOD Plugin(for advanced ctrl+g).
DJ Java Decompiler
7-Zip or Winrar
The link:
https://reverseengineeringtips.blogspot.com/2014/12/unpacking-jar2exe-21-extracting-jar.html?showComment=1480364662658#c447064983483780468
thanks
Related
I have a couple of python files with some dependencies on third-party libraries, like pyaudio. So is there a way to compile everything including python intepreter itself into one .jar\dll file to use them in java\android or xamarin\ .net core, without actual installing python + doing pip install every time?
Also as an option - compile into c\c++?
You can use PyInstaller to create an executable.
Use this command:
pyinstaller --onefile <your_script>.py
https://medium.com/dreamcatcher-its-blog/making-an-stand-alone-executable-from-a-python-script-using-pyinstaller-d1df9170e263
I do not know about compiling into C, but for compiling executables in general you can use pyinstaller, cx_freeze, or a few other less common modules to create an executable folder which contains all the .dll files to run the program. I only have experience with cx_freeze so I'll discuss that here. If your goal is to have the end-user have only 1 "file" show up when they download it you need to use an installer program. To semi-quote cx_freeze documentation at: https://cx-freeze.readthedocs.io/en/latest/faq.html
cx_Freeze does not support building a single file exe, where all of the libraries for your application are embedded in one executable file. [There are modules that do this, but it's my understanding they use "hacks" that can get them flagged by antivirus software.]
You can use IExpress to compress the build directory from cx_Freeze into a self-extracting archive: an exe which unpacks your application into a temporary directory and runs it. IExpress is a utility that’s included with Windows, intended for making installers, but it works equally well if you tell it to run the cx_Freeze-built exe after extraction.
Alternatively, you can create a self extracting archive using 7zip. This is a bit more complex than using IExpress, but might provide more flexibility, and allows you to build your application using only open source tools.
Alternatively you can compile with python setup.py bdist_msi to create a single .msi file which will let the user choose where they want to install the program. At the end of the day the user will still have a directory with all the .dll files and whatnot, but they get to choose where they tuck that stuff away on their hard drive! I think this is the method most applications I've installed use. This is assuming you develop on Windows as well, if not you should include your OS on your post.
I've converted a jar application to an exe because I want to execute this app on computers which not have installed java.
But the .exe file (the old jar) still want JVM or will be executed by Windows?
It depends entirely on whether the method you're using to convert your JAR to an EXE includes the Java runtime in (or alongside) the EXE. If it doesn't, it will have to locate the JRE on the computer it's executing on.
If you feel like elaborating a little, perhaps we can give a more detailed answer.
The implication in the question is that the .jar file was simply renamed to have a .exe extension. If this is what was done, it will not work.
To package a .jar as a .exe that includes its own jvm, look at tools like:
https://www.duckware.com/jexepack/index.html
http://www.jar2exe.com/
http://launch4j.sourceforge.net/
I have exe file called Myapp.exe. Now I want to convert .exe to jar file. That jar file should also work in NON JAVA system. I don't have any idea to implement it. Can anyone please suggest me how to do it?
Direct conversion not available !!!
because they are in entirely different platforms.
Meeting your requirements is impossible for two reasons.
1) You cannot change an EXE to a JAR file.
2) You cannot run a JAR file on a system that doesn't have Java installed.
If you want to run something on a (Windows) system with no Java installation, it needs to be an EXE ... or something else that doesn't require Java.
(It might help if you explained why you think you need to do this. Perhaps there is an alternative set of requirements that are not impossible to meet.)
why i am doing all those stubs is for making my jar has to work in java not installed system.
It needs to be an EXE then!
I have an jar.It is working fine in java installed system.My task is to Bundle jre inside jar(Not along with jar(i.e we can put jre and jar in same folder to run a jar as given in following url mindfiresolutions.com/… ))Because i have to give jar file only to client,in such a way that they can use this Myapp.jar in non java system also.But,i don't know how to bundle jre inside jar.I Don't how to run jre inside jar?
Ermm ...
Is it possible?
No. You cannot embed a JRE inside a JAR file in any way that would allow it (the JAR file) to run your Java code without first installing Java. (And installing Java would defeat the purpose of embedding the JRE ... of course.)
But what you can do is create an EXE file which has a JRE and a JAR embedded in it. And there are tools for doing this. Here's the canonical Question on how to do it:
How can I convert my Java program to an .exe file?
I think you need to read the Oracle documentation on what a JAR file really is, and how Java programs are normally executed. That will help you understand what is feasible ... and what is nonsensical.
How can I put my jar file to web. i.e is there a software that decompile jar file and make html pages of it?
In other words I want to make a java doc.
[Edit according to user comment]
So you want to extract javadoc from a jar...
First you must understand that if your jar doesn't contain the sources, but only the compiled code that your javadoc will not show any comment.
Then you just need to extract the file in your jar using any zip program (for exemple on windows, rename file to .zip, and extract it).
Last thing to do, is to call the javadoc tool on it. Like other said you can use an IDE for that, or simply call from the command line :
http://download.oracle.com/javase/1.5.0/docs/tooldocs/windows/javadoc.html#examples
javadoc -d \home\html -sourcepath \home\src -subpackages java -exclude java.net:java.lang
Creating Javadoc the way it was intended works, as far as I know, only from sources. If the JAR file also contains the source files, then it's just a matter of writing a Java program that opens the JAR file and puts any source files through the javadoc utility.
Interesting idea, but I don't know of anything doing that at the moment. To my knowledge it is however possible to generate Javadoc from inside of java program.
Another approach would be to load the classes into your classpath and use reflection to figure out methods, fields, etc. It will give you a rough overview of the classes, but sadly not the detailed stuff "normal" javadoc generation gives you. A lot of information is discarded upon compilation.
Converting .jar file to html seems impossible, except if you intend to users to download the .jar file from the web. However, html to .jar is possible.
I am certain that only the java source can be converted to javadoc. See here to convert java source to javadoc.
I have created a JAVADOC from a jar file that is not created by you i.e you don't have its source code.
Its simple but tricky.
Get source code from .jar file by using java decompiler. I use JD-GUI | Java Decompiler
Make a new project in myEclipse and copy the 'source code' in source folder.
In project menu you will see Generate Javadoc. Click and select you project and follow the steps. Java doc will be ready after you finish it.
Cheers
Imran Tariq
Once you downloaded your APK file , You need to do the following steps to get a editable java code/document.
Convert your apk file to zip (while start your download don't go
with save option , just go with save as and mention your
extension as .zip) by doing like this you may avoid APKTOOL...
Extract the zip file , there you can find somefilename.dex. so
now we need to convert dex -> .class
To do that, you need dex2jar(you can download it from
here , after extracted, in
command prompt you have to mention like,
[here] (Keep in mind that your somefilename.dex must be inside the same folder where you
have keep your dex2jar.)
Download jad from
http://www.viralpatel.net/blogs/download/jad/jad.zip and
extract it. Once extracted you can see two files like "jad.exe" and
"Readme.txt" (sometimes "jad.txt" may there instead of "jad.exe", so
just rename its extension as.exe to run)
Finally, in command prompt you have to mention like [D:\jad>jad
-sjava yourfilename.class] it will parse your class file into editable java document.
Use mvn javadoc:javadoc in Maven.
everyone, how can I create executable file for the program written on Java in Eclipse Helios? I mean to create small icon to be able start program only by double-clicking on its icon, thanks in advance
edited
I mean executable for Windows
Export .jar in eclipse. (how to)
Use JSmooth (info) to make an .exe file. (how to)
Here is a tutorial that shows you how to make a jar file from eclipse.
If Java is installed on the computer, you can execute your application by doubleclicking the jar file:
http://ecs.victoria.ac.nz/Courses/COMP205_2009T1/TutorialEclipseExportToJar
You didn't mention what platform you are using. There are 2 ways I can think of.
The easiest way is for you to create a *.bat file (in Windows) that contains the java YourApp command line.
If you want to create a more fancy installer and executable, you can use NSIS script to do so. Since you are using eclipse, consider trying EclipseNSIS to generate the NSIS script, which is much faster and easier than writing it yourself from ground up.
The best answer for this situation is to launch the app. using Java Web Start. JWS can not only create desktop and start menu launch items, but provides automatic updates, cross-platform compatibility and much more.
Create a 1-line metafile to specify which class the JVM should look for to start with the main(String[]) method.
Run the command jar cmf [metafileName] [jarfileName] [classfiles] [img/txtDirectories]
You have an executable jar file - type in "java -jar jarfileName" or, directly "jarfileName" at your prompt. On windows, you can also double click on the jar file logo/name to get it started.
Good wishes, - M.S.
PS: Here is the link to a more detailed tutorial:
http://csdl.ics.hawaii.edu/~johnson/613f99/modules/04/jar-files.html