[MNG-6495] ModelResolver cannot be null

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.5.4
• Fix Version/s: 3.6.1
• Component/s: Bootstrap & Build
• Assignee: Michael Osipov
• Reporter: Elliotte Rusty Harold
• Created: 16/Oct/18 17:52
• Updated: 04/Apr/19 23:13
• Resolved: 16/Feb/19 21:45

Description

Got this exception stacktrace while writing some of my own code today:

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)

No big deal except that the JavaDoc at ModelBuildingRequest says "The model resolver to use, may be null."

Not sure whether to update the docs or the code here.