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https://issues.apache.org/jira/browse/MNG-6495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16661094#comment-16661094
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Elliotte Rusty Harold commented on MNG-6495:
--------------------------------------------
I'll have to see if I can repro this. This as not a command line invocation of
Maven. It happened because some of my own code attempted to pass null for an
argument.
> ModelResolver cannot be null
> ----------------------------
>
> Key: MNG-6495
> URL: https://issues.apache.org/jira/browse/MNG-6495
> Project: Maven
> Issue Type: Bug
> Components: Bootstrap & Build
> Affects Versions: 3.5.4
> Reporter: Elliotte Rusty Harold
> Priority: Major
>
> Got this exception stacktrace while writing some of my own code today:
> {noformat}
> Exception in thread "main" java.lang.NullPointerException:
> request.modelResolver cannot be null (parent POM
> com.google.guava:guava-parent:26.0-jre and POM
> com.google.guava:guava:[unknown-version])
> at org.apache.commons.lang3.Validate.notNull(Validate.java:225)
> at
> org.apache.maven.model.building.DefaultModelBuilder.readParentExternally(DefaultModelBuilder.java:1046)
> at
> org.apache.maven.model.building.DefaultModelBuilder.readParent(DefaultModelBuilder.java:830)
> at
> org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:332)
> at
> com.google.cloud.tools.opensource.dependencies.MetadataExplorer.main(MetadataExplorer.java:50)
> {noformat}
> No big deal except that the JavaDoc at
> [ModelBuildingRequest|http://maven.apache.org/ref/3.5.4/maven-model-builder/apidocs/org/apache/maven/model/building/ModelBuildingRequest.html]
> says "The model resolver to use, may be null."
> Not sure whether to update the docs or the code here.
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