kwin opened a new issue, #503:
URL: https://github.com/apache/maven-build-cache-extension/issues/503
### Affected version
1.2.2
### Bug description
When a project with maven-build-cache-extension enabled within m2e I run
into the following NPE:
```
java.lang.NullPointerException: Cannot invoke "java.io.File.toPath()"
because the return value of
"org.apache.maven.execution.MavenExecutionRequest.getMultiModuleProjectDirectory()"
is null
at
org.apache.maven.buildcache.CacheUtils.getMultimoduleRoot(CacheUtils.java:106)
at
org.apache.maven.buildcache.xml.CacheConfigImpl.initialize(CacheConfigImpl.java:160)
at
org.apache.maven.buildcache.RemoteCacheRepositoryProvider.<init>(RemoteCacheRepositoryProvider.java:46)
```
Although from the javadoc it is not clear if `null` must be expected as
return value from
[`MavenExecutionRequest.getMultiModuleProjectDirectory()`](https://maven.apache.org/ref/3.9.15/maven-core/apidocs/org/apache/maven/execution/MavenExecutionRequest.html#getMultiModuleProjectDirectory())
there should be no unconditional dereferencing in
https://github.com/apache/maven-build-cache-extension/blob/8b89d01c97b5d2b69e2fd06d8f4ddc33eb6d1fd5/src/main/java/org/apache/maven/buildcache/CacheUtils.java#L115
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