I'm finally done with my project, JConsole Maker. I put all the Javadoc comments in and I'm ready to export the Javadoc. I just don't know how. I can do it into a folder, but is there any specific way to export it to a .jar so Eclipse developers can use it too?
My answers does not correspond exactly what you're asking but here is a way to build a .jar of your project (JConsole Maker) with associated javadoc:
Once you have generated the javadoc into a folder, do
File > Export...> Java > Jar File and check "Export Java source files and resources".
Then your javadoc will be associated with your whole project.
Please notice that your sources files will also be included...
Related
(I couldn't figure out how to upload my screen capture to stackoverflow. So this is a streamable link: https://streamable.com/0im8tx)
In this video, VSCode opens QueriesController.class as opposed to QueriesController.java when I cmd click into QueriesController.
I have compiled provided the definitions of the jar file in my workspace:
"settings": {
"java.project.referencedLibraries": {
"include": [
"<path-to-jar-that-contains-QueriesController.jar>",
....
"sources": {
"<path-to-jar-that-contains-QueriesController.jar>": "/my/local/java/definition/src/folder",
Does anyone know why VSCode is choosing to open the definition as a .class file rather than a .java file?
I use commands to generate a simple jar package and use it in another project. It's true that when we click the class name, .class file is opened instead of .java file:
About how to generate a executable jar package, you can have a look at this reply:
Compile .java file and generate .class;
Generate manifest and pack them into jar
In general, a JAR (Java ARchive) is a package file format typically used to aggregate many Java class files and associated metadata and resources (text, images, etc.) into one file for distribution.
.java file isn't included in jar packages, and that's why you get .class file opened instead of .java file.
I am not familiar with VSCode but your problem is common across most IDEs.
Usually when a jar is made, it consists of compiled class files rather than original source codes. The reason for this is to run code as efficient and fast as possible and usually people don't want source code in jar because when running they also have to be recompiled again which is a waste of time.
Take a look at this picture. I have just downloaded a jar file from mavenrepository and it downloads the compiled version of jar. The extension is .class
What the IDE does is it tries to decompile the code with a decompiler (In this case as you can see FernFlower decompiler).
However it lacks formatting and in-code documentation the source code (.java) has. Which is why most IDEs offer to download sources. Intellij shows this right on top. Other IDEs may have this setting buried in deep. (You may have to check for yourself)
When you download sources, IDE try to contact the server and download original source code. Probably that would look something like this:
If you look closely you can see name has changed to .java which represents the source code.
VS Code has option under Java Settings, Java Download sources and Maven download sources.
It is not enabled by default. Upon enabling it, VS Code shows the proper source file, although the name appears to be .Class files.(Upon Ctrl + Clicking the symbol, with method implementations, comments, etc.,JavaDoc Comments)
If proper sources are not found in m2 repository, it shows the decompiled class file with stubbed methods. A comment similar to this is shown at the beginning of the file.
// Failed to get sources. Instead, stub sources have been generated by the disassembler.
// Implementation of methods is unavailable.
In Either of the cases, VS Code shows the maven library files as .Class files in read-only mode. Also, source files are not displayed on the Java Project Explorer.(Although even if it exists in the local .m2 repos).
Hope that helps! Happy Coding!
question is: what is included in the executable jar when exporting as such from Eclipse?
I am asking because I would like to know, for example, if I have an image in the project root, would that image be included in the export?
Clarification: I am talking about runnable jar files (edited)
You mean File->Export...->Runnable JAR file? Only the class files are in the jar and - if this option is selected - the linked libraries. You can, however create a source folder (name it "ressources" or so) and this will also be included in your jar.
Eclipse JAR exporter follows JAR Package Specification:
http://docs.oracle.com/javase/1.4.2/docs/guide/jar/jar.html
But as always - the best option to learn is just give it a try.
It's quick and straightforward.
I am using eclipse IDE and want to edit the attached source file of the jar file. For doing this i downloaded the src.zip and attached the file, but it is opening as a .class though I am able to read the file (which is a .class file) but i also want to edit the file.
Why I am not allowed to edit it? how to open an attached file with .java extension not .class extension.
thanks in advance
That's not possible. In order to edit the source, you have to unpack the JAR and create an eclipse project, from which you can then create a JAR with the modified code.
Because you have to link it... Source files are not tied to compiled classes in jar, so if you edit it, nothing will happen to the jar file
You have to create a separate project in Eclipse, and rebuild the jar with your modifications
.class files are not readable by human being unless you decompile it. Many decompilers exist. Carefull about what you are allowed to do and what you aren't, though...
Usually, .java aren't in .jar.
Is there a way to extract the source code from an executable .jar file (Java ME)?
Use JD GUI. Open the application, drag and drop your JAR file into it.
You can extract a jar file with the command :
jar xf filename.jar
References : Oracle's JAR documentation
I believe this can be done very easily. You can always extract the source files (Java files) of a jar file into a zip.
Steps to get sources of a jar file as a zip :
Download JAD from http://techieme.in/resources-needed/ and save it at any
location on your system.
Drag and drop the jar for which you want the sources on the JAD.
3 JAD UI will open with all the package structure in a tree format.
Click on File menu and select save jar sources.
It will save the sources as a zip with the same name as the jar.
Hope this helps.
The link is dead due to some reason so adding the link from where you can download the JDGUI
Your JAR may contain source and javadoc, in which case you can simply use jar xf my.jar to extract them.
Otherwise you can use a decompiler as mentioned in adarshr's answer:
Use JD GUI. Open the application, drag
and drop your JAR file into it.
I know it's an old question Still thought it would help someone
1) Go to your jar file's folder.
2) change it's extension to .zip.
3) You are good to go and can easily extract it by just double clicking it.
Note: I tested this in MAC, it works. Hopefully it will work on windows too.
Do the following on your linux box where java works (if u like the terminal way of doing things)
cd ~
mkdir decompiled_code && cd decompiled_code
// download jar procyon from https://drive.google.com/file/d/1yC2gJhmLoyE8royCph5dLEncgkNZXj58/view?usp=sharing
java -jar procyon-decompiler-0.5.36.jar /Path/to/your/jar -o .
NOTE : as #Richard commented "this may be illegal depending on whether you own the copyright to the jar, the country you live in and your purpose for doing it."
Steps to get sources of a jar file as a zip :
Download JD-GUI from http://java-decompiler.github.io/ and save it
at any location on your system.
Drag and drop the jar or open .jar file for which you want the
sources on the JD.
Java Decompiler will open with all the package structure in a tree
format.
Click on File menu and select save jar sources. It will save
the sources as a zip with the same name as the jar.
Example:-
We can use Eclipse IDE for Java EE Developers as well for update/extract code if require.
From eclipse chose Import Jar and then select jar which you need. Follow instruction as per image below
AndroChef Java Decompiler produces very good code that you can use directly in your projects...
Above tools extract the jar. Also there are certain other tools and commands to extract the jar.
But AFAIK you cant get the java code in case code has been obfuscated.
suppose your JAR file is in C:\Documents and Settings\mmeher\Desktop\jar and the JAR file name is xx.jar, then write the below two commands in command prompt:
1> cd C:\Documents and Settings\mmeher\Desktop\jar
2> jar xf xx.jar
-Covert .jar file to .zip (In windows just change the extension)
-Unzip the .zip folder
-You will get complete .java files
I have a jar file which is used in html file as applet. I want to modify the content of the jar file and to rebuild the jar file so that the html will work fine with the new jar file. How can i do this??
I already tried unzipping using 7zip nad modified the source and created the new jar. But when i use it in html it shows some java.lang.Classnotfound error
You can unjar or rejar the classes and source files as you wish.
unjar
jar -xvf abc.jar
jar
jar cf abc.jar input-files
http://docs.oracle.com/javase/tutorial/deployment/jar/build.html
Make the changes in the code (.java files), recompile to get the .class files. Then simply replace the old .class files in the jar with the new ones. I usually use WinZip, but you can use whatever app that can handle .Zip files. It should just work.
I've faced cases where the launcher of the app uses some sort of verification and checks for this kind of changes. I had to use a new launch script. This doesn't seem to be your case though.
This is surely possible from the command line. Use the u option for jar
From the Java Tutorials:
jar uf jar-file input-file(s)
"Any files already in the archive having the same pathname as a file being added will be overwritten."
See Updating a JAR File
A brief test shows this quickly updates changes apart from trying to delete the file.
I haven't seen this answer on other threads about modifying jar files, and many, marked as duplicates, suggest there is no alternative but to remake the jar completely. Please correct if wrong.
JARs are just ZIP files, use whatever utility you like and edit away!
Disclaimer: When reverse engineering any code be sure that you are staying within the limits of the law and adhering to the license of that code.
Follow the instructions above to unpack the JAR.
Find the original source of the JAR (perhaps its on SourceForge) and download the source, modify the source, and rebuild your own JAR.
You can also decompile the class files in the JAR. This is a rather advanced process and has a lot of "gotchas".