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Maven Dependencies not imported in IntelliJ 2020.2.4

My IntelliJ today just decided to stop importing my dependencies. Running "mvn clean install" normally downloads all the dependencies, but then they are not imported in "External Libraries" at all. It's been all day and I tried a ton of things found online, but nothing worked.
Things I tried:
Changing the Maven used and changing from the bundled one to my own
The buttons Reload Maven Projects and Download Sources do nothing, they start and stop in under a second
File -> Invalidate Cache/Restart
Deleting .idea folder
I have localhost mapped
No, it's not only a visual problem because the libraries result as not resolved.
Thanks in advance!

I think what you need to do is push the "Reload Maven Projects" button in the top-right hand corner of the screen. If it's not there, you need to expand the maven tab.

Ok I solved it.
I had ${version} in the pom because I was using the command "mvn clean install -Dversion=1" to pass that as parameter. Apparently IntelliJ does his checks on the pom before the build even starts, so changing the version directly in the pom did the trick!

No option to reimport dependencies in Maven (IntelliJ)

I added a dependency to my pom.xml file but cannot find the option to import the dependency. I'm not able to use the library in my program.
I've looked online and many suggest going to Settings -> Maven -> .... but this option simply does not exist for me.
I have also seen other solutions of simply right clicking the pom.xml -> Maven -> Reimport. Again, I don't have this option. I am pretty sure this is a Maven project.
Does anyone know what might be the problem?

You might need to configure Auto-Import for Maven projects. You can enable such feature going to File > Settings > Maven > Importing. There is a checkbox that says "Import Maven projects automatically". If you can't find that option, try using Ctrl+Shift+A that helps you to find actions by name. Just write "maven" and check what alternative suits you the best.
If this do not work, open my "Maven Project" Panel. Find it at the right side of your IDE. There you have the reimport button.
EDIT:
A few weeks ago, I faced the same problem when reimporting a project. It was due to Intellij didn't remember the setting for the maven setting file. I needed to override the default "User settings file" (see the picture below) with my valid ~/.m2 path.

The maven will automatically download the jar file from public repository after you save the pom file.
If you find that it doesn't exist in your maven dependencies, you can try to check below:
Check your network connectivity, whether it's able to connect to public repository.
Check whether the required dependency exist in public.
If it's a local dependency, please make sure you have done the Maven Install.

IntelliJ should download and add all your dependencies to the project's classpath automatically as long as your POM is compliant and all the dependencies are available.
When importing Maven projects into IntelliJ an information box usually comes up asking you if you want to configure Auto-Import for Maven projects. That means that if you make any changes to your POM those changes will be loaded automatically.
You can enable such feature going to File > Settings > Maven > Importing, there is a checkbox that says "Import Maven projects automatically".
If that doesn't help, then I would suggest to make a full clean-up and start again:
Close your project window (and IntelliJ) and remove all *.iml files and all .idea folders (there should be one per module).
Run mvn clean install from the command line
Re-import the project into IntelliJ and pay attention when it asks you to enable auto-import
Check this post for more Information

IntelliJ cannot find any declarations

I completely uninstalled IntelliJ and have now reinstalled and imported my project. I imported using gradle and can see all of the files in my project present. However, when I open a file I can't find any declaration to go to by doing cmd + click. I have the Java 7 SDK setup, and I can't even go to the declaration of classes in my own project. Going to a Java core class like String or List doesn't work either. How can I enable the IDE to be able to find my classes?
I'm on OSX Yosemite, IntelliJ 2016.1.2 build 145.972.

I had this same problem, and #AniaG's solution in the comments worked for me.
Right-click src folder
Mark Directory as > Sources Root

I faced the same issue and spent almost 15-16 tiring hours to clean, rebuild, invalidate-cache, upgrade Idea from 16.3 to 17.2, all in vain.
We have a Maven managed project and the build used to be successful but just couldn't navigate between declaration/implementations as Idea couldn't see the files.
After endlessly trying to fix this, it finally dawned to me that it's the IDEA settings causing all the headache. This is what I did (Windows system):
Exit IDE
Recursively delete all .iml files from project directory del /s /q "C:\Dev\trunk\*.iml"
Find and delete all .idea folders
Delete contents of the caches, index, and LocalHistory folders under <user_home>\.IntelliJIdea2017.2\system
Open Idea and import project ....
VOILAAAAAAAAAAAA...!!
I hope this helps a poor soul in pain

I had the same issue with idea and I was trying to open a maven project but the pom files where not identified. So right clicking on the pom file and choosing "add as maven project" did all the magic for me :)

Had the same problem. But only on my own methods.
Just fixed it by invalidating cache: (File-> Invalidate Caches/Restart)

I was having similar issues in my IntelliJ mvn project. Pom.xml was not recognized.
What worked for me was right click on the pom.xml and then add as a maven project.

Most of the times there has been a problem with building the cache of the IDE, or something related.
Most probably, File -> Invalidate Caches / Restart, will resolve this problem, just let the IDE finalize it's caching.

Your source folders where your Symbols are (Classes) are need to be configured as "Content Root".
Open Project Structure: #;
Click Modules
You can configure your Content Root (Sources, Tests, Resources etc) for each module that you want to Navigate to.
Once done you should be able to navigate to your symbols.

If you see red circle on the icon of Java files, and got warning like "cannot find declaration to go to". Then you can do something below:
Right click root folder of your project/module.
Mark Directory As -> Excluded.
It works for me. in Windows 7, Intellij 2016.1.1

Right-click on your src folder and choose the option "mark directory as" --"Source root" and along with it again right-click on your project and choose "reformat code"(under this choose cleanup code too) and that will work fine.

I got this problem on Big Sur.
Solution:
File -> Invalidate Caches. After that press Option + Enter on every red field.

In my case, I just updated my IntelliJ to Ultimate 2018.2 and all of my projects suddenly cannot find the implementations and the 'src' folders - it turned out IntelliJ removed the type of project (e.g. Maven).
What I did is:
Right click on the root project > Add Framework support... > Look for Maven (in my case) > Wait to re-index again > Then it worked again.
UPDATE 2:
I have always been encountering this when I update IntelliJ (2019.1.1 Ultimate Edition).
Just click the refresh button of Maven Tab and it should re-index your current project as Maven Project:

I found this cannot find declaration to go to problem once in my Maven project. The reason for this was just that one of the sub-projects in my project did not import as maven project correctly.

None of the methods listed in this channel works for me.
However, I am able to resolve it using the following method, and I hope that it works for you too.
Right Click the pom.xml file and then select "Maven". After that, click "Import Maven Project"

Ensure that the directory which contains your compiled classes and libraries is marked as sources Root.

I too faced this issue. I've tried the solutions mentioned here. The issue seems not with the source folder.
For me the issue occurred when I installed a new version of IntelliJ, was using 2019 version moved to 2020 version.
The project got opened in the new version but the declarations were missing.
I fixed this by :
- File>Project Structure.
- Under Project Settings go to Modules. Here you should see the different project folders, for me it was not there.
- Click the + button on top and click Import Module.
- Select the root pom.xml and wait for the indexing to complete.
After the indexing is done all the declarations were working.

Importing my project (which had 3 different modules in it) - as File -> Module From Existing Sources fixed it for me.

Just run below commands
mvn idea:clean
mvn idea:idea

IDEA may ignore some of your maven dependency files. The "External Libraries" node in your project structure might be empty or incomplete.
Go to:
IntelliJ --> Preferences
Search for Maven [on the left tab] -> Ignored Files
See if there is any path on the right side that is checked(ignored) and uncheck that.

Came across the same issue and in my case (Java project), I had to include all the dependent jars in the project's libraries section.
File -> Project Structure -> Libraries
I had to add my project dependent jars in the above section (for example; project/web/lib/). After doing so, all resolved fine. I hope this will help someone.

For someone whom the above solution didn't worked.
For gradle,
File -> Project Structure
Click on Project Under Project Settings
Update Project Language level as Modules, private methods in interfaces etc.
Click OK and Import Gradle Settings

I had similar issue with Goland JetBrain and what worked for me is similar to what #user8382868 said but I only closed the IDE, renamed the folder .idea file to .idea.old and after re-opening the project everything worked.

For Java based project, this is what worked for me :-
-Download Intellij 2020.3.4 version instead of 2021.1.1
-Add configuration, plugins.
-Configure settings, Project Structure
-Right click on the root folder -> Mark Directory as -> Sources Root
-File -> Invalidate caches/restart -> Invalidate and Restart

In my case I was using a gradle project with subprojects. The reason IntelliJ couldn't find declarations was that the subprojects were not built.
After investigating why subprojects were not built, I found out that using "auto-import" was breaking the subprojects.
After importing the project from build.gradle without auto-import, it worked for me.

For what its worth, in Pycharm it is: Right click on the root folder->Mark Directory as-> Sources Root

Same Problem for Python Project!!!
I tried to make a clean new intellij project and updated everything. Tried different virtualenvs but nothing worked out.
UNTIL I uninstalled the Python Plugin + Restart IntelliJ + Intall Python Plugin + Restart IntelliJ again. I'm not sure if this is a "real" solution, but it solved my issue.
Maybe you can try something familar for Java "Plugin"/JDK?

In my case, none of the above helped. Only upgrade of Intellij from 2017.3 to 2018.2 helped.
Do not try 2018.1 as it had a bug wherein the Find files popup would not come up.

Somehow I set my Maven modules to be ignored. In the Maven tool window right click and select 'Unignore Projects'.
Then all the directories will be automatically selected.

I had the same issue.
what i did was.
Select your project >right click> go to settings> plugins > search for cucumber > and then re-bundled the plugin
and restart your intellij.
It should fix the issue.

Nothing above worked for me unfortunately. I deleted all downloaded dependencies from .m2\repository and did a mvn clean install to download them again. (Although i did not have any issues in the pom.xml at the first place)
That worked for me.

In my case, I've to open preferences:
And I went to Project -> Project Structure -> set my folder project in +Add Content Root
So now all it work fine!

How to build and run Maven projects after importing into Eclipse IDE

I am learning building a Java project in Eclipse using Maven. I created a Java project HelloWorld from
“maven-archetype-quickstart” template in a folder D:/maven_projects. Then to convert the Maven project to support Eclipse IDE, I navigated into the project folder and issued the commands:
mvn eclipse:eclipse and mvn package .
Then I imported the project in Eclipse and did the necessary Eclipse configurations like setting the Maven local repository in Eclipse classpath. Now the project in D:/EclipseWorkspace folder. I ran the project successfully in Eclipse printing "helloworld".
Now if I want to go on develop the project and for that reason want to add new dependencies in pom.xml in Eclipse, then the new jars are not added in classpath when I run the project.
So my question is after importing a Maven project into Eclipse how can I add more and more dependencies in pom.xml, then build and run the project? What is the recommended and efficient way to do this?

I would recommend you don't use the m2eclipse command line tools (i.e. mvn eclipse:eclipse) and instead use the built-in Maven support, known as m2e.
Delete your project from Eclipse, then run mvn eclipse:clean on your project to remove the m2eclipse project data. Finally, with a modern version of Eclipse, just do "Import > Maven > Existing project into workspace..." and select your pom.xml.
M2e will automatically manage your dependencies and download them as required. It also supports Maven builds through a new "Run as Maven build..." interface. It's rather nifty.

1.Update project
Right Click on your project maven > update project
2.Build project
Right Click on your project again. run as > Maven build
If you have not created a “Run configuration” yet, it will open a new configuration with some auto filled values.
You can change the name. "Base directory" will be a auto filled value for you. Keep it as it is. Give maven command to ”Goals” fields.
i.e, “clean install” for building purpose
Click apply
Click run.
3.Run project on tomcat
Right Click on your project again. run as > Run-Configuration.
It will open Run-Configuration window for you.
Right Click on “Maven Build” from the right side column and Select “New”.
It will open a blank configuration for you.
Change the name as you want. For the base directory field you can choose values using 3 buttons(workspace,FileSystem,Variables). You can also copy and paste the auto generated value from previously created Run-configuration. Give the Goals as “tomcat:run”. Click apply. Click run.
If you want to get more clear idea with snapshots use the following link.
Build and Run Maven project in Eclipse
(I hope this answer will help someone come after the topic of the question)

Dependencies can be updated by using "Maven --> Update Project.." in Eclipse using m2e plugin, after pom.xml file modification.

Just install the m2e plugin for Eclipse. Then a new command in Eclipse's Import statement will be added called "Import existing maven projects".

answer 1
Right click on your project in eclipse
go to maven -> Update Project
answer 2
simply press Alt+F5
after updating your pom.xml. This will build your project again and download all jar files

Right Click on your project
Go to Maven>Update Project
Check the Force Update of Snapshots/Releases Checkbox
Click Ok
That's all. You can see progression of build in left below corner.

When you add dependency in pom.xml , do a maven clean , and then maven build , it will add the jars into you project.
You can search dependency artifacts at http://mvnrepository.com/
And if it doesn't add jars it should give you errors which will mean that it is not able to fetch the jar, that could be due to broken repository or connection problems.
Well sometimes if it is one or two jars, better download them and add to build path , but with a lot of dependencies use maven.

If you are getting this error :in cucumber Exception
Cucumber Exception: java.lang.ClassNotFoundException:
cucumber.io.ResourceLoader :
then add following jar file to your pom.xml
<dependency>
<groupId>info.cukes</groupId>
<artifactId>cucumber-core</artifactId>
<version>1.1.8</version>
</dependency>

Run the maven build once and should be gone

In eclipse, maven dependencies are overriding project dependencies

I have a "master project" that uses several "modules". The modules are in the pom.xml, but I also have the code for the modules as projects in Eclipse. I defined the modules as project dependencies both in "Properties|Project References" and in "Properties|Java Build Path". I also made sure all of the Eclipse projects are at the top of "Order and Export" in Java Build Path.
The master project is not recognizing changes to the modules within eclipse. When I press F3 to see the code, it opens java source from my .m2 directory. It's obviously ignoring my Eclipse projects. Am I missing some setting? What should I do?

You don't need to add the dependent projects into the Project references (at least when using m2eclipse-plugin), just add them as dependencies on your masters' pom.xml. I haven't had the need to touch the Build path since I've started using Maven in Eclipse.
Make sure you have enabled the Workspace resolution of the plugin by right clicking on project root -> Maven -> Enable Workspace Resolution. If it says "Disable Workspace Resolution", it is already enabled. You may also need to run "Update project configuration" under the same menu.
This way when you run your master-project from within Eclipse, any changes made to the other projects will be "visible" to the master (and you can actually use hot swap during runtime even on the other projects).

If you're using Maven, you pretty much want to commit to Maven. Even if you do configure Eclipse with Eclipse-specific dependencies, anytime you update your project configuration using Maven, it will do a complete rewrite of your configuration.
I strongly recommend converting any of your other project build dependencies into Maven-enabled projects that can be used as Maven dependencies.
In your specific case (through using the Maven modules), this means ensuring that each of your modules are imported into Eclipse as m2e-enabled projects. m2e will then automatically wire in the dependencies between modules and other dependent projects.

Im scratching my head as to why you would need your modules defined as dependencies on your top level project. Are you trying to avoid having to define the (cross) dependencies at a module level? In any case, as per other suggestions, first of all put your dependencies in the correct places in your POM, then either run
mvn eclipse:clean eclipse:eclipse
to update your Eclipse settings, or better still, make sure m2eclipse is installed and import your maven projects directly into the IDE.