Intellij Cannot resolve symbol on import

Question

This problem happens intermittently for different libraries and different projects  When trying to import a library  the package will be recognized  but the class name can t be resolved   If on the import statement  I right-click - gt  Goto - gt  the package s declaration  I see all the decompiled classes displayed in the side pane -- Including the ones I need -- If I try to auto-complete the import statement  I notice the class I need is not featured in the dropdown   I tried invalidating caches already  doesn t work  I cannot find any class conflicts -- there is no other jar file in my classpath with the same package name  I am able to import this class into other projects   Please see screen shots       Anyone have a clue

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you can try invalidating the cache and restarting intellij  in many cases it will help   File -  Invalidate Caches Restart

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For 2020 1 4 Ultimate edition  I had to do the following  View - gt  Maven - gt  Generate Sources and Update Folders For all Projects The issue for me was the libraries were not getting populated with mvn -U clean install from the terminal

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Had the same problem till I noticed that the src folder was marked as root source instead of java  Changing to only the java  src main java  to be the source root solved my problem

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I tried invalidating caches and restarting  but the only thing that worked for me was wiping out the  idea directory completely  then creating a new project from scratch

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Check your module dependencies    Project Structure  Ctrl Alt Shift S   Modules Select your problem module  Change tab on top of window  Dependencies   Check what needed library  maybe  you need to add specified library in the tab  libraries   or module has listed here and it has right scope   complile  mostly

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IntelliJ has issues in resolving the dependencies  Try the following    Right click on pom xml -  Maven -  Reimport Again Right click on pom xml -  Maven -  Generate sources and update folders

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I found the source cause   In my case  I add a jar file include some java source file  but I think the java source is bad  in Intellij Idea dependency library it add the source automatic  so in Editor the import is BAD  JUST remove the source code in  Project Structure  -   Library   it works for me

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Nothing I tried above worked for me  not that I tried every suggestion    What finally did the trick was to rename the class -- I just added a 2 to the class name and filename   Then I resolved all the references manually    Since they weren t recognized  the refactoring did not change the references automatically    Once the  2-version  was happily resolved everywhere  I was then able to refactor and remove the 2 from the class and file  and everything was then as it should be

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I had a similar issue with my imported Maven project  In one module  it cannot resolve symbol on import for part of the other module  yes  part of that module can be resolved    I changed  Maven home directory  to a newer version solved my issue   Update  Good for 1 hour  back to broken status

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Intelli iDEA causes these stupid troubles   times  Simple goto pom xml   right click and do -  Maven -  Reimport   This should solve the problem

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I had this recently while trying to use Intellij to work on NiFi  turned out the issue was that NiFi requires Maven    3 1 0 and the version that I d checked out with  I guess my default  was 3 0 5  Updating the Maven version for the project fixed it  so in some cases Maven version mis-alignment can be a thing to look   I d guess it s fairly unusual but if you get this far on the thread you re probably having an unusual issue

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Anton Dozortsev I was driven crazy by a similar behavior  I ended up re-installing the IDE a bunch of times  only getting past the issue after removing the IDEA app  all caches  preferences  etc   I tried all kinds of steps in the interim   like restarts  invalidations  deleting  idea and   iml files  and others    Turns out  the problem was due to IntelliJ s idea max intellisense filesize setting   I had set it to 100KB  which was smaller than my dependency s size  leading to IntelliJ showing it as unknown  just like in your screenshot   Fix    Click on Help -  Edit Custom Properties Set the property to a larger value  the default is 2500KB idea max intellisense filesize 2500

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I found the following answer from  jossef-harush and  matt-leidholm useful from another link    in IntelliJ editor  click on the red keyword  Integer for example  and press ALT   ENTER  or click the light bulb icon  select Setup JDK from the intentions menu      click on Configure      In my case  the JDK path was incorrect  pointed on  opt jdk1 7 0 51 instead of  opt jdk1 7 0 65       click on the     and browse to the right JDK path       let s clear the cache

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I faced a similar issue  Mike s comment helped me move in the direction to solve it   Though the required library was a part of the module in my project too  it needed a change of scope  In the module dependency  I changed the scope to  Compile  rather than  Test  and it works fine for me now

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in my case the solution was to add the project as maven project  besides the fact that i imported as maven project  P   go to pom xml -  right click -  add as maven project

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I had the same issue and the reason for that was incorrect marking of the project s sources   I manually created the Root Content and didn t notice that src main test folder was marked as Sources instead of Tests  So that is why my test classes were assumed to have all their test libraries  JUnit  Mockito  etc   with the scope of Compile  not Test   As soon as I marked src main test as Tests and rebuilt the module all errors were gone

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The same problem  If these methods not work  you can try to delete the lib from local maven repository  and reimport to pom      Finally it  fine for me

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Missing io  Try import org openide util io ImageUtilities

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I also got this error for multiple times when I try to build a new java project    Below is the step how I got this stupid issue     Create an empty project  and create new directory src main java  Create the source package net gongmingqm10 sketch  Use gradle wrapper  gradle idea to build the gradle stuff for the project  Add some dependencies in build gradle file  and gradle build  reimport the project  Create User java and School java in the existing package net gongmingqm10 sketch I got the error while I try to use import School in User java  Intellij keeps complain can not resolve symbol on import    Solution   Build the project first  and mark the main java as the source root  Create a new directory with the same name net gongmingqm10 sketch  Move all the files from the old troubling packages to new package   Root cause   Directory tree of source code  As you can see from the tree  I got a directory named net gongmingqm10 sketch  But what we really need is the 3 levels directory  net- gongmingqm10- sketch  But before I finish building my project in Intellij  I create new directory named net gongmingqm19 sketch  which will give me a real directory with the name net gongmingqm10 sketch   When we trying to import it  Obviously  how can intellij import the file under the weired directory with the name a b c

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File -  Invalidate Caches Restart or rebuilding the project did not work wor me   What worked for my Gradle project was to  Refresh all Gradle projects  from the Gradle tab on top-right corner of IntelliJ v2017  using the yellow marked button shown below

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Please try File-  Synchronize  Then close and reopen IntelliJ before you invalidate   Once I restarted  I would have invalidated but the synchronize cleared everything after restarting

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Run this command in your project console    mvn idea idea   Done   Had this issue many times  Tried  Invalidate Cache  amp  Restart  and all other solutions  Running that command works perfect to me   I m currently using IntelliJ 2019 2  but this also happened in previous versions and solution worked as well

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file-  Project Structure -  Modules  find the module with problems  click it and choose the Dependencies tab in the right side  Click the green plus sign  try to add the jar or libraries that cause the problem  That works for me

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Right click on pom xml file  go to Maven click on Reimport  I had similar problem and this worked for me

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File - gt  Invalidate Caches Restart And Build your project

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There can be multiple reasons for this  In my case it was wrong source root issue  Invalidate caches didn t work along with other solutions   Check your module source roots    Project Structure  Ctrl Alt Shift S   Modules Select your problem module  Change tab on top of window  Sources   Remove unwanted source roots  Keep one and add src and test source roots in this root

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What did it for me is to edit the package file in the  idea folder as I accidentally added sources to this jar library and android couldn t resolve it by deleting the sources line as marked in the b m picture library error   Then rebuild the gradle and bam problem solved

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After a long search  I discovered that a dependency was somehow corrupted on my machine in a maven project  The strange thing was that the dependency was still working correctly in the compiled java code  When I cleaned and rebuilt my maven dependency cache however  the problem went away and IntelliJ recognized the package  You can do this by running   mvn dependency purge-local-repository   Intrestingly  the source of my problem hence wasn t IntelliJ  but maven itself

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Simple Restart worked for me   I would suggest first try with restart and then you may opt for invalidating the cache    PS   Cleaning out the system caches will result in clearing the local history

[java] Intellij Cannot resolve symbol on import

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