IntelliJ IDEA cannot resolve symbol and cannot resolve method

Question

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

User · Answer

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

User · Answer

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- gt  Project Structure- gt  platform Settings- gt  SDKs Check your JDK is correct or not   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

User · Answer

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

User · Answer

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

User · Answer

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

[intellij-idea] IntelliJ IDEA "cannot resolve symbol" and "cannot resolve method"

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