[GROOVY-7639] NPE when using safe traversal operator with CompileStatic

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.5
• Fix Version/s: 2.4.6
• Component/s: Compiler
• Assignee: Shil Sinha
• Reporter: Ben Podoll
• Created: 19/Oct/15 16:41
• Updated: 22/Feb/16 20:48
• Resolved: 02/Nov/15 20:55

Description

In the code below, the "if" condition throws a NPE when it reaches the "p3" object. If I remove the @CompileStatic from the "SomeOther" class it works.

import groovy.transform.CompileStatic

@CompileStatic
class Person {
  String name
  OtherInfo otherInfo
}

@CompileStatic
class OtherInfo {
  int favoriteNumber
}

@CompileStatic
class SomeOther {
  SomeOther() {
    Person p1 = new Person(name: 'Ben', otherInfo: new OtherInfo(favoriteNumber: 1))
    Person p2 = new Person(name: 'Aaron', otherInfo: new OtherInfo())
    Person p3 = new Person(name: 'Fred')
    [p1,p2,p3].each { Person p ->
      println "checking: ${p.name}"
      println p?.otherInfo?.favoriteNumber
      if(p?.otherInfo?.favoriteNumber == 7){
        println "luckiest number!"
      }
    }
  }
}

new SomeOther()