IntelliJ Idea mapstruct java: Internal error in the mapping processor: java.lang.NullPointerException

Intellij IdeaMapstruct

Intellij Idea Problem Overview

After upgrading to the version 2020.3 of Idea i get a NullPointerException for the mapping processor. If anybody has a clue... Thank you!

Intellij Idea Solutions

Solution 1 - Intellij Idea

The solution is to update MapStruct to 1.4.1.Final or later version, see this issue for more details.

You can also add -Djps.track.ap.dependencies=false at File | Settings (Preferences on macOS) | Build, Execution, Deployment | Compiler | Build process VM options as a workaround.

Solution 2 - Intellij Idea

If you cannot update MapStruct (my case), details here.

You have to find the exact place where put the -Djps.track.ap.dependencies=false setting (and I had hard time to figure out where).

So, as they say, a picture is worth a thousand words:

Open Preferences --> Build, Execution, Deployment --> Compiler and write ps.track.ap.dependencies=false Preferences --> Build, Execution, Deployment --> Compiler

Solution 3 - Intellij Idea

There are several intellij bugs here. If I change the maven version 1.3.0.Final to 1.4.1.Final the intellij don't want to update the version.

Solution

  1. Upgrade the maven version to 1.4.1.Final
  2. Delete manually mapstruct 1.3.1.Final from External Libraries(Project Structure | Libraries)
  3. mvn clean package
  4. Click reload all maven projects

It works without -Djps.track.ap.dependencies=false

If you have swagger exclude mapstruct first:

<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${swagger2.version}</version>
<exclusions>
    <exclusion>
        <groupId>org.mapstruct</groupId>
        <artifactId>mapstruct</artifactId>
    </exclusion>
</exclusions>

Solution 4 - Intellij Idea

Expanding on freedev's answer. For windows users the following will be the place to go :

  1. Click on the settings gear icon on the right. enter image description here
  2. Go to settings (ctrl+A+S is a good shortcut to get here).
  3. Find Compiler under Build,Execution, Deployment in the left menu enter image description here
  4. Add -Djps.track.ap.dependencies=false in User-local build process VM options

Solution 5 - Intellij Idea

In my case, I made these changes and it works perfectly for me.

enter image description here

enter image description here

Then I just deleted the caches and rebuilt the entire project, maybe it wasn't necessary but that worked for me.

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionAntonioView Question on Stackoverflow
Solution 1 - Intellij IdeaCrazyCoderView Answer on Stackoverflow
Solution 2 - Intellij IdeafreedevView Answer on Stackoverflow
Solution 3 - Intellij IdeaSisakView Answer on Stackoverflow
Solution 4 - Intellij Ideafireball.1View Answer on Stackoverflow
Solution 5 - Intellij IdeaCodeXpView Answer on Stackoverflow