Here's what I'm seeing:
Normally I can choose "New Java Class" but for some reason I'm not getting this option. I created this project by opening an empty directory and building it out from there. I've seen this question, but that answer didn't help me. Here's my module settings:
Even if I open my pom.xml directly as a project, it still has this problem. How do I fix this?
The directory or one of the parent directories must be marked as Source Root (In this case, it appears in blue).
If this is not the case, right click your root source directory -> Mark As -> Source Root.
For some reason, intellij didn't recognize my directories as packages. If I created something directly from the java directory, it would give me the correct options. I fixed this by deleting everything under java/ and recreating it. This may be an intellij bug.
This happened when I was trying to add classes to a generated package using xjc plugin.
Intellij allows to add classes only to packages which are correctly names and have the "source root" status.
Can be fixed as-> right click on the directory where you're not able to add classes:
Mark sources root
refer image for clarity
This worked for me :
Right click the java folder (myproject/src/main/java)
Click "Mark Directory as"
Click "Source Root"
Right click the myproject folder (myproject/src/main/java)
Click "Mark Directory as"
Click "Source Root"
So basically had to mark some inner folder as Source project and alter mark parent project again as Source project..
Hacky way but this worked for me.
Related
I have been at this problem for a few days now, don't know why it is still happening. I have tried other solutions that have been posted on stackoverflow but no luck.
Below the following code is from the book crafting interpreters in java.
In IntelliJ 2019.4 this error always pop up when I am trying to run the .jar file.
Error: Could not find or load main class com.jam.Jam
Caused by: java.lang.ClassNotFoundException: com.jam.Jam
I have built the .jar file and setting the main class as com.jam.Jam and the class path for the .jar file as /home/username/Jam-Programming_Language/src/com/jam/Scanner.Scanner.
This is the layout of my project directory.
The following solutions I have tried:
Solution 1
Open Project Structure
Select Modules, then click on the module for which you want the
dependency
Choose the Dependencies tab
Click the '+' at the bottom of the page and choose the appropriate
way to connect to the library file. If the jar file is already
listed in Libraries, then select 'Library'.
and
Solution 2
Go to the Project Structure, click on Modules, and click on your
Module
Choose the "Dependencies" tab
Click the "+" button on the right-hand side and select "Jars or
directories..."
Add the directory(ies) you want (note you can multi-select) and
click OK
In the dialog that comes up, select "classes" and NOT "jar directory"
Make sure you're using that Module in your run target
It had no effect apparently. Any clue on what I should do?
Edit: Uploaded wrong screenshot, replaced screenshot.
Thanks to CrazyCoder for pointing out the errors in my project (silly mistakes). It seems that after I have resolved those mistakes.
I had to follow the solutions I have posted then rebuild the .jar file.
Afterwards I need to mark the src folder as a source root folder (right click folder -> Mark Directory as -> sources root)
Edit Configurations if pointing to wrong main class.
Set Project compiler output (File -> Project Structure -> Project) to a folder designated to hold the output (any folder basically in or outside the project).
The error says, it is trying to run: com.jam.testfile. Your class is called: com.jam.Jam.
Click the dropdown where it shows "testfile" with a little red X on it. Select "Edit Configuration." For the "Main class", select "com.jam.Jam". That's it!
BTW, the little red X means there is some problem with your configuration.
Related: IntelliJ does not show 'Class' when we right click and select 'New'
In the above accepted answer, it says the "New" does not give the option for Java Class because it was not the source root (blue directory).
However, as you can see, even though where I am right-clicking is source root, indicated by blue box, it is not giving me the option for Java Class
Any idea why?
This directory is imported from git so it did not follow the usual "Create Project" for java directly from Intellij
You are right clicking in the wrong spot -- youre "too high" up the tree. Go to where you code is (as in the package under "src") and try it there and you will see the option for a New Class.
EDIT: You don't need to be in the source root. You need to be in the source directories themselves. The blue dot I believe is a git status indicator. What you want is an entirely blue folder.
Go down under "src". Likely under "src" then "main" then "java", and you're there (that's blue for me) and then you will see your package folders. Below those are where you likely want to be adding classes.
As many mentioned above you can right click on the folder you would like it in. In your case:
If you push Alt+1, it might be easier for you to right click
src > New Java Class
Alternatively you can push:
Alt+1 (Project View)
Alt+Ins
or
Ctrl+Alt+Ins
1) Right click on src
2) Click New > package
3) Name your package and press OK
4) Right click the newly made package
5) New > Java Class
If the folder where we are trying to create the class is not marked as source or test then the option is not available.
Right click the project and go to project structure then under project settings -> Modules, Select the folder where you wanted to create class and mark as Source or Test appropriately and then click apply and ok.
Now you will see the change of color of the folder/package(Sources->Blue, Test->Green) and you will get the option to create the class.
This worked for me.
I know this is an old thread, but it happened to me because my gradle files were not synchronized. So if you are within a team working on same project and face this issue, make sure to run gradle sync.
You should go inside java project then you can create java class.
screenshot of my problem
IJ recognizes main.java as a package, not a normal folder.
This is maven project.
How can i solve this problem?
You have incorrectly marked src as a source root (notice that is is blue) - right click and "unmark" it as a source root.
Then, locate the src\main\java folder and right click on the java folder -> mark as source root.
Once you have done this, intellij should recognise your folder structure correctly.
You might also want to mark resources as a resource root.
I've been trying to import a project that works on a friend's computer, however no matter what I try, the package hierarchy is completely lost and the result is this
Has anyone seen this issue before? I've been struggling with it for a while. Occasionally creating a new project and copying in the src folder works, but I've been unsuccesfful in my recent attempts.
The presentation of packages is a user option. Click the little down-arrow at the top of the package panel, then select "Package Presentation" from flat to hierarchical.
Turns out we weren't including the .classpath file in the source control. Facepalm. Good answers, though.
It could also be that the folders are not listed in the project as Source Folders. Go to the project properties and check that the root folders (looks like "data" and "src" here) are listed as source folders in the Build Path.
In project I work on there are folders with name started with dot sign. They are used by external tool to generate actual code/properties variation based on some properties. IntelliJ complains about java classes in these folders (path doesn't correspond to package name). What I'd like to do is to force the compiler to ignore specific folders (they shouldn't be used in build anyway). I found Settings->Compiler->Excludes option but I can't see the dot started folders when I try to specify exclusions. Pasting folder path doesn't work either. Not sure if it is like that because of Intellij or mac hidden folder issue. Any hints?
In the module editor, set the folder to be excluded from the project, i.e totally ignored. Select the folder and then click on the "Excluded" button. Then the folder will be shown in red and will not even show up in IDEA project view, and no indexing or compiling will take place on this folder.
You can "Show Hidden Files and Directories" which should be the last icon in the Select Path window.