Develop Reference

Adding External jar copy to Project

I created a project but I am using an external library for it. enter link description here
I added the library to my Beans as follows:
Right click on folder "Libraries"
Add Library
Create...
Gave it a name "gson 2.7"
Picked the class, source and javadoc files.
I went on and continued programming and then I added my code to Github. Then when I cloned it my Library was missing.
How can I fix this ? How can I make it dynamic so I dont have to worry about this anymore. In other words I need to add the library to my code and not just the reference.
Thanks a lot for the help

Just upload a copy of your library to github.

I have not used netbeans, but from what I understand it adds the jar somewhere outside of your project directory, and it simply adds the location of the jar to your classpath. When you upload and then clone the project from github, the jars are not uploaded/cloned, and the project structure metadata for your project is also lost from netbeans.
My suggestion is to learn and start using a build tool like maven. It takes up the responsibility of adding your dependency libraries everytime, given that you have an internet connection. It also adds the libs to the target directory of your project folder, so you probably will need the internet connection only once. The libs will be uploaded and cloned back from the github repo everytime.
IDEs like eclipse have inbuilt support for maven, so you don't even have to worry about executing the mvn commands. Here's a tutorial that will get you intrigued - with the IDE that you prefer.
https://platform.netbeans.org/tutorials/nbm-maven-quickstart.html

Thanks a lot for all the replies and comments.
Technically there are two approaches to my problem. For this articular example I chose to copy the external jar files to my project.
1. Copy jar files to your project.
Go to project properties
Under Libraries folder make sure to set up a libraries folder by following the steps.
Add Library at the bottom ( you can create or import; since I already had gson in Netbeans I just imported it.)
Press ok to confirm and you are done!
2. Use Maven
Go to plugings and make sure you have all Maven plugins installed, if not do so.
Create an new project and choose maven/java application
Follow the prompts
At this point you can start coding (in my case I just imported my class files from the other project)
Right click in "Dependencies folder and then "Add Dependency"
Under query type the repository you are looking for; in my case "com.google.code.gson : gson : 2.7"
Click add and you are done!
Thanks a lot to everyone for the help :)

How can I commit only a single .java file to git from an eclipse project?

I want to commit only a .java file to an already existing repository. I am using github for a class, and we are each given access to a private repo containing project information. I am supposed to add only a .java file to this repo, but I can't figure out how to do this. I have come close: I committed only the .java file, but it is inside a directory with the same name as my eclipse project.
Is there a way to commit only the .java file, without any of the project information, while keeping the project usable?
Thanks.
edit:
My goal is to have \git\repoName\MyFileName.java
as well as keeping the files already in \repoName\ and keeping the MyFileName.java in a usable eclipse project.

Is there a way to commit only the .java file, without any of the project information, while keeping the project usable?
yes, you will need to create a .gitignore file, and put the rest of your project into the gitignore file, (and also gitignore itself), that way, the only files that are tracked by git are the .java files.
As for the files being inside the directory with the same name as your project, take a look at where you cloned the git repo to, and make sure it is on the same level as your project files.
Take a look at this documentation
http://git-scm.com/docs/gitignore
https://help.github.com/articles/ignoring-files/

I think its much simpler than what you are expecting :)
You can do, git add, docs:
git add yourFileName.java
Now you can commit the .java file
git commit -m "I am updating only .java"
You can either reset or let it be as it is!!
git reset
reset will not have any history. So, be careful if you want to reset. In this scenario I think you dont have to reset. See here for some help.
See my answer on how to push/pull changes from eclipse into github. Let me know for any help on how to interact with github on eclipse.
You want to remove a subtree and create a new repo?
This is definnitely possible but you have to be careful. Creating a subtree only for file like yourFileName.java surprizes me a bit, but why?
For whatever reasons, see this for an easy way, and the original post is this Detach (move) subdirectory into separate Git repository
This blog might also help you.

I figured it out!!
The key was to add a source. You can do it when you create a project, one of the options will say "Link Source" or something along those lines.
You can also do it after a project is created:
Right click the project in Project Explorer. Go to Properties -> Java Build Path (on the left) -> Source (the first tab) -> "Link Source..."(button on the right)
Then just browse for the git repo folder that you already have and you're good to go! Just create new class files within /repoName in Project Explorer.
If anyone needs clarification or anything, let me know.

How to commit project into trunk from Eclipse (via Subclipse)?

I have a project in Eclipse, MyProject/, that I want to share and import into my SVN repo:
MyProject/
src/
dist/
lib/
...etc.
Ultimately, I want to end up with an SVN repo for this project that looks like this:
svn://mySVNrepo/
MyProject/
trunk/
src/
dist/
lib/
branches/
tags/
But when I right-click MyProject and select Team >> Share, and follow the prompts, I end up with:
svn://mySVNrepo/
MyProject/
src/
dist/
lib/
So it's: (1) not allowing me to create trunk, branches and tags dirs, and (2) not allowing me to "nest" my imported project into trunk.
I then tried to create the directories manually from the SVN Repo Explorer view, and created:
svn://mySVNrepo/
MyProject/
trunk/
branches/
tags/
Then, I tried to share my project at:
svn://mySVNrepo/trunk
When I try to run this initial import, I get a warning from Eclipse:
Warning: The specified folder already exists in the repository. If you continue, that folder will be checked out to your local workspace and your project will be connected to this existing location. Do you want to continue?
I don't want to overwrite my local copy (that I'm trying to share); it has a lot of work in it!
I don't really understand what this warning is telling me, and basically I don't want to mess anything up!
So I ask: is my approach wrong, and if so, how can I commit my project for the first time into a trunk/ subdirectory? And if my approach is correct, then please help me decipher this warning message and advise on what I should do. Thanks in advance!

One approach that would work is to keep your manually created trunk/branches/tags directories in SVN. Check out the empty /trunk into a parallel directory on your local workstation (Let's say directory #2, with your local project as #1). Then copy your project + code from #1 into that /trunk directory and commit to SVN.
Then you can make a 3rd directory locally, and check-out your SVN copy and ensure it compiles/runs properly. If so you can delete the intermediate #1/#2 directories, or keep your initial project as a backup just incase (but it'll be non-versioned). Then continue to use directory #3 as your new SVN monitored workspace.
If I'm unsure how my changes will affect work that I don't want to lose, I try to take an approach like this so the least amount of harm is done to my code if something goes wrong (say with a SVN command/operation I'm unfamiliar with, etc).

From the menu, select Window > Open Perspective > SVN Repository Exploring
Right click your repository > New Project Structure > Single project or multiple projects layout > enter 'MyProject' for the Name. This will create the new project with the /trunk/branches/tags/ project structure.
Once it's created, right click the Project and select Checkout.
'MyProject' should now be in your Navigator View. From there you can copy your /src /dist and /lib folders into 'My Project' trunk folder.
Right click your Project and select Team > Commit.
EDIT:
You can also try the Subversive plugin for Eclipse. This plugin has an easier way to share your existing projects to svn as a multiple project layout (trunk/branches/tags folder structure).
I posted the steps in a similar thread.

After one hour of trial and error, I just did the following:
Share it to a wrong folder
Go into the SVN explorer and rename the folder (with src etc.) to trunk
Move that trunk to the correct location (e.g. Project/trunk) in svn
Got into the Project Explorer in Eclipse, right click on the project, team, switch and select the new trunk.

Eclipse Hell . . . Failed to read the project description file (.project)

I think Eclipse is trying to make me miserable. A couple of hours ago, my project was working and compiling well. Suddenly that all changed. Eclipse somehow wipes out all changes I have made to my files(activity, manifest etc.) I make sure to save often but when I go to run the project, I get the error that I have a build error. I checked and there was none, so I go to close Eclipse, so I can reopen and see if the errors will go away. Instead what happens is Eclipse wipes clean all my files and I end up with a project on disk with lots of blank code files. I try to run anyway, and I get the error message below.
Failed to read the project description file (.project) for 'com.example.android.nfc.simulator.FakeTagsActivity.FakeTagsActivity'. The file has been changed on disk, and it now contains invalid information. The project will not function properly until the description file is restored to a valid state.
Anyone have an idea what in the world this is about and how I can rectify this?

I would recommend to wipe out all the eclipse related configuration files(make sure you take the backup if you have manually made some changes in those) and import the project again, by following
File -> Import... -> Existing Project into Workspace
Make sure you take the backup of whole project before doing this.

When Eclipse gets stuck in some obscure status, I usually find useful to recreate the .metadata folder in workspace directory. It is a drastic solution, but it usually works for me. After that you can reimport all your projects.

This happened to me because I had a conflict in my .project file. I opened it up in a text editor and fixed the conflict (in my case, removed from ====... to >>>branch..., as well as <<<HEAD) and then I was able to open the project in eclipse.

I was just encountering this same issue (using Zend Studio 12, which is built on Eclipse). My problem was that I was creating a project from a Remote Server, and I was just downloading everything, which also included the .project file from the old project. It wasn't showing this error until I'd closed the program and tried to open it again (which usually wasn't until the next day).
I seem to have resolved it by making sure not to download the .project when initializing the project.

If the .project file is a text file, so if you have it in version control you might want to copy it over from there.
Before you trying the following make a backup of your current project state.
Assuming you don't have an old copy, you can open it in a text editor and try to see if there is something obvious wrong.
If this fails, copy the source files of your project to a fresh location (without the eclipse configuration files) and import it as a new project into eclipse.

if you still have all of your other source (.java files, AndroidManifest.xml, resources), you might be able to get your project back by simply going to the folder containing the project, removing the .project file that you say is now empty, and then using the new project wizard to recreate the project (and .project file) for you from your existing tree of source.
from the menus, select File -> New... -> Project , and then, in the first dialog, choose Android Project from Existing Code .
if you had done anything special to the .project (reliance on specific .jar files or changes to classpath), you may have to re-do these steps after you re-create your project; but at least it should pick up the code you already have.

If all the files are empty, and you have no working Backup, I can't help. I would recommend to use proper version control in the future.
Use git or mercurial, they have nice UI integrations (see tortoisegit/tortoisehg).
To decouple the build process and library management from eclipse, take a look at maven or gradle, this might help you in future projects.

If you use git, complete the merge e.g. del the head in your androidmanifest.

I also got the Same Issue in Eclipse but the real problem is i removed the actual Source project folder from source location (from which eclipse is trying to take the project) to some other place hence my eclipse is unable to get web.xml file since it is not available. Now i changed my source project folder location to the path where eclipse is trying to search for. Issue Resolved for me.

Just delete the 'servers' folder in your workspace and try again.

After checking out Subversion code into Eclipse, how do I get it to build?

This problem has been frustrating me for some time...
A lot of sites like Sourceforge use SVN or Subversion to manage their code. I have little problem compiling SVN code in C++, but when it comes to Java, my IDE gives me a headache.
I've installed Subclipse for SVN support for Eclipse, and it works. I can check out any code into my Workspace. Now Subclipse will put the whole thing into a special project of some sort that can't be compiled. So I search Google for something and I come up with modifying the eclipse XML file to specify the 'nature' to be a Java project.
Okay, now it's a Java project. Say I have a folder structure like:
\src
\data
\graphics
I get 800 compiler errors complaining the package name is org.company.SomePackage instead of src.org.company.SomePackage.
Then what I do is create packages called src, data, graphics, etc, instead of just folders. I cut and paste everything in the folders into the packages and finally I can compile it.
What is a better way to do this?
EDIT: I can only check out anything SVN as a SVN project, and there's no way within Eclipse to change that to a Java project. How can I check out the SVN as a java project in the first place?

I get 800 compiler errors complaining
the package name is
org.company.SomePackage instead of
src.org.company.SomePackage.
Right click on Project -> Properties -> Java Build Path -> Source Tab -> Add "src" as a source folder and remove any others.

it thinks your source is stored in root folder. you need to specify to the project that /src is the source folder.

In general when we have an Eclipse project, which contains Java code – but we didn’t set it up as a Java project when we created or checked out this project, we are struck. And Eclipse doesn’t allow to change the project type inside the Gui. So we need to add the java nature as below.
1. Close your project.
2. Open your project file (which is located in your root directory of the appropriate project) called .project with your default editor. Search for
< natures>
< /natures>
and change it to as below
< natures>
<nature>org.eclipse.jdt.core.javanature</nature>
< /natures>
Save the changed file.
3. Open the project again – now it should become a java project.
Then do the following as explained by Kevin
On the Project Explorer Window ->Right click on the specific Project -> Properties -> Java Build Path -> Source Tab -> Add "src" as a source folder and remove any others.
For me when I went into “Source Tab” – the “src” folder was already added, but it was not giving me the desired result (ie I was still not seeing the .java files in the project explorer window). So I removed the “src” filed that was already added in the Source Tab and then added them again. And then all worked fine.

You have to configure proper source paths. Some open source projects make this automatic by checking their .project and .classpath files in with the rest of their files. For others, you'll have exactly the problem you are having. You need to set the classpath so the Java compiler knows where to find the source. You right click on the project and select properties and configure an arbitrary classpath, but the answer given by Kevin is easier for a beginner.