Dependencies are not resolved in Maven projects

Problem

When opening the maven project, there are errors highlighted for some symbols in the code, like import statements, class usage, etc.

Solution

1. Check the pom.xml and make sure all the required dependencies are valid (no errors highlighted under <dependencies> section). In the Maven tool window, the project is correctly recognized (shown in the Maven tool window, and the dependency list is correct).
2. Check any customized settings
   • Make sure Settings | Build, Execution, Deployment | Build Tools | Maven is correctly configured.
   • Go to <project root>/.idea/workspace.xml and search for <component name="MavenImportPreferences"> , make sure the context is the same as the settings.
3. Try the solution in https://support.jetbrains.com/hc/en-us/articles/40249549269394--Cannot-resolve-symbol-error.
4. If you have any customized settings for the maven settings file or maven repository, please make sure they are synced with the default maven settings:

   • For a customized maven repository, please add the <localRepository> tag in ~/.m2/settings.xml .

     <?xml version="1.0" encoding="UTF-8"?>
     
     <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                                   https://maven.apache.org/xsd/settings-1.0.0.xsd">
     
         <localRepository>/absolute/path/to/maven-repository</localRepository>
     
     </settings>
     

   • For customized setting defined outside the default ~/.m2 folder, please manually create the ~/.m2 folder and paste the settings.xml here.

   • Go to IntelliJ IDEA and click File | Invalidate Caches | check the first three options | Invalidate and Restart.