IntelliJ IDEA "cannot resolve symbol" and "cannot resolve method"

Intellij Idea

Intellij Idea Problem Overview

What are common causes for IntelliJ IDEA not being able to resolve built-in JVM types and methods? For example, when I mouse over String the tooltip says "Cannot resolve symbol 'String'". It's as if IntelliJ has doesn't know where the JVM is.

By the way, I am running OS X 10.6.6. Everything was working fine until I ran the system update this morning.

Intellij Idea Solutions

Solution 1 - Intellij Idea

Most likely JDK configuration is not valid, try to remove and add the JDK again as I've described in the related question here.

Solution 2 - Intellij Idea

First check if you have configured JDK correctly:

  • Go to File->Project Structure -> SDKs
  • your JDK home path should be something like this: /Library/Java/JavaVirtualMachine/jdk.1.7.0_79.jdk/Contents/Home
  • Hit Apply and then OK

Secondly check if you have provided in path in Library's section

  • Go to File->Project Structure -> Libraries
  • Hit the + button
  • Add the path to your src folder
  • Hit Apply and then OK

This should fix the problem

Solution 3 - Intellij Idea

For me, IntelliJ could autocomplete packages, but never seemed to admit there were actual classes at any level of the hierarchy. Neither re-choosing the SDK nor re-creating the project seemed to fix it.

What did fix it was to delete the per-user IDEA directory ( in my case ~/.IntelliJIdea2017.1/) which meant losing all my other customizations... But at least it made the issue go away.

Solution 4 - Intellij Idea

I was facing the same problem when import projects into IntelliJ.

for in my case first, check SDK details and check you have configured JDK correctly or not.

Go to File-> Project Structure-> platform Settings-> SDKs

Check your JDK is correct or not.

enter image description here

Next, I Removed project from IntelliJ and delete all IntelliJ and IDE related files and folder from the project folder (.idea, .settings, .classpath, dependency-reduced-pom). Also, delete the target folder and re-import the project.

The above solution worked in my case.

Solution 5 - Intellij Idea

For me, I had to remove the intellij internal sdk and started to use my local sdk. When I started to use the internal, the error was gone.

my sdks

Solution 6 - Intellij Idea

First of all you should try File | Invalidate Caches and if it doesn't help, delete IDEA system directory. Then re-import the Maven project and see if it helps.

Solution 7 - Intellij Idea

For me ,

File -> project structure -> Project Language Level (11) selection worked. Local variable syntax for lambda paramters.

Solution 8 - Intellij Idea

In my case, cloning repo from the remote was the easiest way to solve this issue.

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionLandon KuhnView Question on Stackoverflow
Solution 1 - Intellij IdeaCrazyCoderView Answer on Stackoverflow
Solution 2 - Intellij Ideauser4660857View Answer on Stackoverflow
Solution 3 - Intellij IdeaDarienView Answer on Stackoverflow
Solution 4 - Intellij IdeaMaulik KakadiyaView Answer on Stackoverflow
Solution 5 - Intellij IdeaThiago CavalcantiView Answer on Stackoverflow
Solution 6 - Intellij Ideasarjeet singhView Answer on Stackoverflow
Solution 7 - Intellij IdeaRishabh DugarView Answer on Stackoverflow
Solution 8 - Intellij IdeaTemur IsroilovView Answer on Stackoverflow