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So for my class I need to use eclipse to do some graphics stuff in Java. I've tried both Eclipse standard 4.4 and Eclipse for Java developers, but with both when I tried to create a new Java project, the src folder is completely empty. Why is that?
Edit: I should add in more information. In the lab section of my class I was able to follow the instructions and create a lab 1 project src folder, which contains many files such as Lab1.java, Polygon1.java and all that. When I am trying to do it on my own machine, it's not working
Because it's a blank canvas!!
Right click on the src file New->Class
Give the new class a name and a package and you're away, you can start coding.
If you want to include libraries create a new lib folder at the same level as the src folder and copy any jar folders into this folder. Right click on the .jar files and click Bukd Path->Add to Build path, you'll now be able to import and classes contained in this jar file(s)!!!
Because you created a new project. If you haven't added any code yet, why would there be code in the src folder?
I hope it's OK to ask this here. Netbeans forums isn't responding. If not, I'll delete this or ask for it to be deleted. I'm desperate so I'll face the wrath, if any.
I moved my Netbeans projects folder from one directory node to another to make backing up all my stuff easier. BAD MOVE.
Now when I open a project using Files | Open project (ctrl-shift-O) NO source files appear because there is no "+Source Packages" node to expand.
It looks like this for all projects, e.g. one named GBL:
Projects
-GBL
+Libraries
It doesn't look like this anymore:
Projects
-GBL
+Source Packages (How do I get this back?)
+Libraries
The Netbeans Properties for each project shows me the path it's using. Windows 7 Explorer shows me that the src, build, and nbproject folders contain files and ALL the source files are in the src folder for that path.
What have I done and more importantly what should I do to get back to being able to open a project normally?
(I've tried recreating the original Netbeans folder and using Windows Explorer to copy an entire project folder into it but: same result--all I see is the Libraries node under the project's name node.)
I just tried to Clean (and also Build) to see what would happen. Error:
ant -f C:\\Users\\Dov\\Documents\\NetBeansProjects\\BasicShirt -Dnb.internal.action.name=build jar
C:\Users\Dov\Documents\NetBeansProjects\BasicShirt\nbproject\build-impl.xml:[u]231[/u]:
Must set src.dir
I just Set Configuration by right-clicking the project's name and provided a path to the src folder.
NOW I SEE MY SOURCE FILES BUT NOW THIS line in the .xml file is flagged with similar message:
<fail unless="[u][b]test[/b][/u].src.dir">Must set test.src.dir</fail>
NOW what do I do? (Netbeans 7.4.)
If I could get rid of the 7.4 automatic creation of +Test Packages, I might be OK.
If you can help, I'd be very happy.
(I'm considering re-installing 7.3 if available or removing and reinstalling 7.4 and try to avoid the "testing" requirement, but there goes all my many tweaks of 7.4.)
Well, after considerable frustration with the problem, I solved it, essentially.
It's here, in total. My synopsis plus how it helped me follows. In short, I had to set up a new java project based on existing sources using the New Project Wiz and simply direct Netbeans to the sources.
File > New Project
Choose Java Project with Existing Sources.
Type a (new) project name and ...
... make the Project Folder contains the path to where you want the new project to be stored. (For me, this is the folder where Netbeans has been able to find my sources.)
Click Next for the Existing Sources page of the wizard and ...
5a. ... in the Source Packages Folder pane, click Add Folder and ...
5b. ... navigate to your sources and select the source root folder.
Clicking Next goes to the Includes/Excludes pane, which I didn't need to use.
Well I have my source code that i have done using the IDE netbeans. Now I wanted to move this java application to a web application. For that I need to create a jar file from my source code, so that I could invoke it in ma jsp file.
I have not been able to find any option in netbeans or any other way to create a .jar file of this source code.
Could someone tell me how to do that.
Thanks
Create a Java archive (.jar) file using NetBeans as follows:
Right-click on the Project name
Select Properties
Click Packaging
Check Build JAR after Compiling
Check Compress JAR File
Click OK to accept changes
Right-click on a Project name
Select Build or Clean and Build
Clean and Build will first delete build artifacts (such as .class files), whereas Build will retain any existing .class files, creating new versions necessary. To elucidate, imagine a project with two classes, A and B.
When built the first time, the IDE creates A.class and B.class. Now you delete B.java but don't clear out B.class. Executing Build should leave B.class in the build directory, and bundle it into the JAR. Selecting Clean and Build will delete B.class. Since B.java was deleted, no longer will B.class be bundled.
The JAR file is built. To view it inside NetBeans:
Click the Files tab
Expand Project name >> dist
Ensure files aren't being excluded when building the JAR file.
Please do right click on the project and go to properties.
Then go to Build and Packaging.
You can see the JAR file location that is produced by defualt setting of netbean in the dist directory.
I also tried to make an executable jar file that I could run with the following command:
java -jar <jarfile>
After some searching I found the following link:
Packaging and Deploying Desktop Java Applications
I set the project's main class:
Right-click the project's node and choose Properties
Select the Run panel and enter the main class in the Main Class field
Click OK to close the Project Properties dialog box
Clean and build project
Then in the fodler dist the newly created jar should be executable with the command I mentioned above.
Now (2020) NetBeans 11 does it automatically with the "Build" command (right click on the project's name and choose "Build")
I've installed NetBeans 6.9.1 and installed few updates for it.
Then I've created a new project from existing sources. After a few changes I've closed it. And now I am having an error, when trying to open a new project from existing sources (the same files):
Sources directory is already netbeans project (maybe only in memory).
After Googling it, I noticed it happened not only with me. But I didn't find the correct solution. I've tried to restart the IDE, I've tried to restart the PC, I've tried to reinstall NetBeans. Nothing helped.
Thank you!
I was having the same problem:
Sources directory is already NetBeans project (maybe only in memory).
Netbeans creates a folder in your project named "nbproject". Once you delete that, restart the IDE and you're good to go.
When you create a NetBeans project from existing sources, NetBeans uses the same directory to add its own files: a netbeans folder with .proj files.
Solution: delete the netbeans folder and restart the IDE. Opening a new project should now work.
Go to the folder containing your project
Delete the folder named nbproject
Restart Netbeans
Try creating your project again from the original folder
This means the project folder is already a netbeans project. So instead of adding it as a new project open it as
This happens(i believe) because netbeans tries to version control the files created or edited.
Under the project folder netbeans create a netbeans directory just delete it . This has been tested in Ubuntu. Then you can import your project if php then php using existing sources.
Click File >> Recent Projects > and you should be able to use edit it again. Hope it helps :)
On Windows at least none of these answers work (for me anyway!). I have found the only way is to copy an existing netbeans project folder in to your new project and manually edit the xml project name.
I also opened the private/private.xml and removed the open files xml just incase these caused problems.
Once I'd done this the project works as normal.
I checked the "Put NetBeans metadata in separate directory" tick and it works fine.
This is in 2. Name and Location after you choose PHP from existing source
In my case my project root directory consists ".project". This contain the XML reference of the project name.
By removing this, i am able to create a project.
Usually this happened when we copy source code of a already created project and copied in different folder and try to create a project from it. as netBeans create its folder nbproject in our project folder this folder also get copied with our source code and it give error "Sources directory is already NetBeans project (maybe only in memory)" remove this folder from you newly copied folder and voila you can create a new project.
If this is your own source code and you already have a Netbeans project folder with your source files you should just start with:
File | Open Project...
not
File | New Project ...
because the project is not new.
If it helps anyone else, I had the same problem and the solution was to reinstall NetBeans.
I had tried all sorts of fixes: Deleting the NetBeansProjects folders, checking/unchecking "Put Netbeans metadata in a separate directory", killing/restarting NetBeans, restarting the system, etc. Nothing cleared the message...except the reinstall.
The advice here about removing the nbproject directory is not quite the whole story.
What Netbeans seems to do (and we are guessing at reverse engineering here) is to look for an xml file which has opening and closing project tags in it. This it concludes is evidence of an already existing project. Now if your files have an nbproject directory there, that will contain a project.xml file which contains the said tags. So removing that will do what you want.
But, my files don't have a nbproject directory but still NetBeans tells me there is an existing project maybe in memory. The reason is: my files include a file called pom.xml and that contains the said project tags in the xml (it was created by an entirely different system). Once that xml file is removed, then NetBeans will create an html project for me importing my code.
In sum: look through any xml files in you existing code, and be wary of project tags.
This happened to me when I tried to import an Eclipse project in a brand new NetBeans 7.2.1 install on Ubuntu 12.04LTS.
I mistakenly selected the import projects from workspace (the first option in the import wizard's opening pane) on the first attempt, and it opened the project in the original Eclipse workspace path (which was on a usb stick).
From this, I then realized that I actually need the second option - import project ignoring project dependencies, which lets you specifically choose source and destination folders. After closing the project, I tried to import again with the proper option, but it didn't work.
From then on nothing I did helped - restart the IDE, move the source folder, nothing. There was no nbproject folder in the project or /var/cache in the user folder to delete (in-fact there was no nbproject folder in the whole file-system).
Since restart didn't work, I'm guessing that there is a garbage project entry somewhere which Nb reads (See Martin Frické answer above).
After googling along the lines of 'netbeans clear memory project cache' with no success, I opted to reinstall NetBeans -
sudo /usr/local/netbeans-7.2.1/uninstall
sudo ./netbeans-7.2.1-ml-javase-linux.sh
which solved it.
If you are on a Mac, press command shift G and in the box type /users and then go, next click on your user name and navigate to netbeansprojects and open it. Then delete the ones in there that are causing problems. You can then create your project.
Note: I had moved my wordpress folder to my desktop trying to figure this out, so I dropped it back into the origional location and it works fine. So if you did this, just replace the wordpress folder after deleting the problem projects from the netbeansprojects folder and its contents back to the original installation folder.
Hope this helps...:)
This is what I did to solve this error:
1) I copied a folder named "folder1" (and I called the new folder "folder2"). "folder1" was a Netbeans project so it had a folder called "nbproject" inside it.
2) When I tried to create a project out of the "folder2", Netbeans threw an error "Sources directory is already netbeans project (maybe only in memory)."
3) Inside Netbeans delete the project of "folder1". Then, delete the two folders named "nbproject" (one is inside "folder1" and the other is inside "folder2").
4) Inside Netbeans, create two new projects: one for "folder1" and another for "folder2". The error should not appear anymore.
copy an existing netbeans project folder in to your new project and manually edit the xml project name.
reinstall netbeans
copy/move all files/folders (except nbproject/ folder) to a new folder for your project, with a new name.
Try to create a new empty project; then you can copy the public_html to the new project folder and it will appear .
I faced the same issue:
Sources directory is already NetBeans project (maybe only in memory).
The solution is:
Netbeans creates a folder in your project named "nbproject". Once you
delete that, restart the IDE and you're good to go.
Just going through the sample Scala code on Scala website, but encountered an annoying error when trying to run it.
Here's the code: http://www.scala-lang.org/node/45. On running it on Eclipse, I got this message 'Editor does not contain a main type' that prevents it from running.
Is there anything I need to do...i.e break that file into multiple files, or what?
In Eclipse, make sure you add your source folder in the project properties -> java build path -> source. Otherwise, the main() function may not be included in your project.
I have this problem a lot with Eclipse and Scala. It helps if you clean your workspace and rebuild your Project.
Sometimes Eclipse doesn't recognize correctly which files it has to recompile :(
Edit:
The Code runs fine in Eclipse
A simpler way is to close the project and reopen it.
You have to make sure that your .java files are in the .src folder in eclipse. I had the same exact problem until I got it figured out.
Just make sure that the folder you work in is added to the built path:
right-click your folder --> build Path --> Use as source Folder
and it should now find main therein.
You can try to run the main function from the outline side bar of eclipse.
I had the same problem. I tried all sorts of things. And I came to know that
My .java files were not linked and
they were not placed in the 'src' folder.
Things I did:
Project properties >> Java Build Path >> Source
Deleted the original 'src' folder which was empty using 'Remove' option
Added the source that contained my source .java files using the 'Add Folder' option
This solved the error.
Just close and reopen your project in Eclipse. Sometime there are linkage problems. This solved my problem
A quick solution:
First, exclude the package:
Right click on the source package >> Build Path >> Exclude
Then include it back:
Right click on the source package >> Build Path >> Include
What you should do is, create a Java Project, but make sure you put this file in the package file of that project, otherwise you'll encounter same error.
That code is valid. Have you tried to compile it by hand using scalac? Also, have you called your file "addressbook", all lowercase, like the name of the object?
Also, I found that Eclipse, for some reason, set the main class to be ".addressbook" instead of "addressbook".
you should create your file by
selecting on right side you will find your file name,
under that will find src folder their you right click select -->class option
their your file should be created
Make sure that your .java file is present either in the str package, or in some other package. If the java file with the main function is outside all packages, this error is thrown.
Have faced the similar issue, resolved this by right clicking on the main method in the outline view and run as Java application.
I just had this problem too. The solution is to make sure eclipse created the project as Java project. Just create a new Java project and copy your class into the src folder (and import the eventual dependencies). This should fix the problem.
The correct answer is: the Scala library needs to before the JRE library in the buildpath.
Go to Java Buildpath > Order and Export and move Scala library to the top
I had this problem with a Java project that I imported from the file system (under Eclipse Helios). Here's a hint: the src code didn't seem to be compiled at all, as no "bin" directory showed up.
I had to create a Java project from scratch (using the wizard), then compare the .project files of the non-working and working projects.
The project giving "Editor does not contain a main type" had this as the "buildSpec" in the .project file:
<buildSpec>
</buildSpec>
But the working project had this as the "buildSpec":
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
I copied this in, and the imported project worked.
I know my answer is for Java, but the same might be the issue for your Scala project.
May be the file you have created is outside the src(source) folder. Trying to call the class object(from the file located in the src folder) from the .java file outside the source folder results in the same error. Copy .java file to the source folder, then build it. The error will be gone.
I had the same problem. I had the main class out of the src package, in other folder. I move it in and correct folder and solved
run "eclipse -clean -refresh" from command line. This fixed the issue for me when all other solutions failed.
This could be the issue with the Java Build path.
Try below steps :
Go to project properties
Go to java Build Path
Go to Source tab and add project's src folder
This should resolve the issue.
If it is maven project please check the java file is created under src/main/java
If you are not getting please change the JRE path and create the java files in above folder structure
For me, in Eclipse 3.6, this problem occurs when my main method is not public. I caused the problem by having a main method like this:
static void main(String[] args)
The dubugger was unable to detect this by itself. I am pretty suprised Eclipse overlooked this.
In the worst case - create the project once again with all the imports from the beginning. In my case none of the other options worked. This type of error hints that there is an error in the project settings. I once managed to solve it, but once further developments were done, the error came back. Recreating everything from the beginning helped me understand and optimize some links, and now I am confident it works correctly.
Follow the below steps:
Backup all your .java files to some other location
delete entire java project
Create new java project by right click on root & click new
restore all the files to new location !!
File >> Import >> Existing Projects into Workspace >> Select Archive Filed >> Browse and locate file >> Finish. If its already imported some other way delete it and try it that way. I was having the same problem until i tried that.
One more thing to check: make sure that your source file contains the correct package declaration corresponding to the subdirectory it's in. The error mentioned by the OP can be seen when trying to run a "main type" declared in a file in a subdirectory but missing the package statement.
I have this problem too after I changed the source folder. The solution that worked for is just editing the file and save it.
Try 'Update Project'. Once I did this, The Run as Java Application option appeared.
In my particular 'Hello World' case the cause for this problem was the fact, that my main() method was inside the Scala class.
I put the main() method under the Scala object and the error disappeared.
That is because Scala object in Java terms is the entity with only static members and methods inside.
That is why Java's public static void main() in Scala must be placed under object.
(Scala class may not contain static's inside)