Why so red IntelliJ seems to think every declaration method cannot be found resolved

Question

I just installed and re-installed IntelliJ  Every Java file is coming up RED  I checked the JDK  it is at 1 6     The maven clean install build worked just fine   I m getting the usual highlighted errors  On every declaration      Cannot resolve symbol SomeEntityBean Bean   and on every method      Cannot resolve method SomeFunction     How do I fix these false errors

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IntelliJ sometime gets confused after importing maven projects and then changing poms externally or generating sources outside IntelliJ.

You might want to try a maven->force reimport from within intellij on the project root

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In my case  getter and setter dependencies were coming through lombok plugin  Using java with Spring   And in the new installation of intellij idea  I had not installed the lombok plugin  Installing the lombok plugin fixed it for me

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Try to delete the  IntelliJIdea15 depends on version  from C  Users Username  When you start IntelliJ it will create the folder again

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I could not get any of these solutions to work for me  I had to manually go to every method class that I got the error on and import it manually  After that everything was fine

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If you re still getting this error  even after you ve tried all the other suggestions on this question  you have checked all your JDK  Maven settings  invalidated cache  synchronized your workspace and restarted  but things still aren t working for you  then go to your project directory and delete the entire  idea folder  Restart your IntelliJ  all the files under  idea will be created freshly which reflects the current situation    At least  this worked for me

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I had the same problem after changing JDK from 1 6 to 1 7 in my pom xml and setting Maven 3 path   JDK project settings to 1 7   What did it for me was    File -  Invalidate Caches and Restart  PS  problem occured again  so i just reimported the full project after deleting the  idea folder and now it works fine as usual

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I have IntelliJ IDEA 12 x on the Mac and I use Maven 3 and I get the red highlighting over my code even though the Maven build is fine  None of the above  re-indexing  force import  etc   worked for me  I had to do the following    Intellij - gt  Preferences - gt  Maven - gt  Importing         Use Maven3 to import projects   I have to check the Maven3 import option and that fixes the issue

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I had the same problem and after trying all of the above suggestions  it turned out that my IntelliJ installation had not picked up my JAVA HOME system variable  and it had no SDK JDK set   I fixed it by following these instructions  Configuring Global  Project and Module SDKs

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I experienced this when I updated my JDK manually and removed the previous JDK  Solution  In the 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    And everything should be back to life

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Resolved by simply  Refresh All Gradle Projects

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This is if you see Java classes in red and get this error   Cannot resolve symbol    If you re importing projects into IntelliJ and none of the above solutions worked for you then give this a try  This is what worked for me when everything else failed   Go to to your project folder and rename delete the  idea folder which has the idea settings for your project  This would have been created from your old IntelliJ version  Once you have renamed deleted the  idea folder  import your project into IntelliJ  You should not see any errors for your Java classes now  Hope this helped

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My problem solved by changing jdk to default   like this  Open Jdk was installed but don t know why intellij set configuration to  java-8-openjdk-amd64  This was the problem I have changed to default-java and no more red error

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Using IntelliJ 2019 3 and a Gradle project dependent on my own Gradle project  the only thing that fixed it for me was Reimport All Gradle Projects under View - gt  Tool Windows - gt  Gradle  and refresh button     Before that I tried restarting IDE  I tried  Invalidate Caches and Restart   I tried Rebuild project  neither helped

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I had the same issue  what fixed it for me was   Go to File gt Setting gt Maven  I set the Maven home directory  settings file and local repo   Go to Maven Projects and click on Reimport All Maven Projects      This did the trick

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I was trying to use all the advices above  but unfortunately no one helped me  So finally I ve decided to delete my intelij workspace and create the new one - it helped    But earlier I was also doing cleaning the cache  reimporting maven projects  cleaning projects and rebuilding them

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The issue was that the file I was trying to import was so large that IntelliJ wouldn t run any CodeInsights on it   Setting the idea max intellisense filesize option to a higher value as per the instructions on this answer resolved my issue

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I face the same issue when upgraded Intellij version  It was resolved for me by using old maven than the one bundled with the new Intellij

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Yet another work around One of the solutions  which suggested clicking Alt Enter didn t have the Setup JDK for me  but Add     to classpathworked

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I spent most of a day trying all the solutions here  but nothing seemed to work   The only thing that worked for me was to completely uninstall IntelliJ and install it again   However  for me  when I deleted IntelliJ from the Application folder  the problem returned as soon as I re-installed it   What I finally had to do was to use App Cleaner to completely remove IntelliJ and all the config and settings files   After I did that and then reinstalled IntelliJ  the problem finally went away   See How to uninstall IntelliJ on a Mac

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Tried invalidating cache  reimporting the project  switching to built-in Maven  removing the  m2 folder and its parts  - nothing worked  After I had completely broken Maven  while it had built the project successfully before  now it couldn t anymore   I had to reinstall it from scratch  It helped

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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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I had the same problem   In my case the problem was with maven home directory and user settings file in Intellij Settings under Maven  I had installed Maven not in the default directory and I had also changed the location of the settings xml file  This should also be changed in the IntelliJ Settings   Hope this helps also

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Check that you have a proper JVM SDK setting in IntelliJ Properties  If invalidate-cache-and-restart isn t enough  check that your are using the proper JVM SDK  such as Java 1 7   Look in  Preferences -  IDE Settings -  Scala -  JVM SDK  Or right click your project -  Open Module Settings -  Project Settings -  Project -  Project SDK -   Set to Java 1 7   Open Module Settings -  Platform Settings -  SDKs -   Ensure that there is a Java 1 7  otherwise you ll need to add it   If you ve made a change  then it s probably best to re-run Invalidate Cache  amp  Restart

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I had this problem on a fresh install of IDEA  I thought it had brought its own JDK or would be able to find the one already on the machine  but apparently not  not sure what the checkbox in the install dialog did  now   When I clicked on the lightbulb and clicked the  Setup JDK  button and then clicked  Configure   it revealed that it was trying to get the JDK from  C  Program Files JetBrains IntelliJ IDEA Community Edition 2018 1 jre64  I browsed around  trying a few folders in the JetBrains tree  but at least the dialog was smart enough not to let me apply any  including the original   saying they were not valid locations for a JDK  So I browsed over to the Java tree and tried that  and it accepted this   C  Program Files Java jdk1 8 0 40  After I OK ed the config  it didn t appear to have worked  so I went to try invalidating the IDEA cache and restarting  as described in other answers   and it told me that I had background tasks running  So I canceled out of the invalidation  and while I was doing that  whatever recompilation or database updating it was doing completed  and all the red in the edit window went away  So it takes a few seconds  at least  for the JDK config to settle out

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I had the same issue I was using JDK 1 9 with IntelliJ 14  I solved reinstalling Java with latest version of JDK 1 8 1 8 0 161 in this case   I also removed the 1 9 version from  HKEY CURRENT USER Software JavaSoft JRE Security Baseline

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Yet another solution on IntelliJ Ultimate 2018 2   Hover over the import marked red Select dropdown arrow on the popup that appears on left  below  Choose  Add library     to classpath

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For me it was the JDK that was not set up correctly  I found a solution that I documented here  https   stackoverflow com a 40127871 808723

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IntelliJ sometimes gets confused all by itself  even without the external changes Korgen described  though that is a good way to consistently reproduce it     Click File -  Synchronize  and IntelliJ should see that everything is okay again    If that doesn t work  IntelliJ s caches might be corrupt  this used to happen a lot more often than it does now   in that case  regenerate them by   Clicking File -  Invalidate Caches and restarting the IDE    though loading the project will take a while while the caches are recreated

[java] Why so red? IntelliJ seems to think every declaration/method cannot be found/resolved

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