[GROOVY-3471] @Delegate not working when it refers to a Map - ASF JIRA

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If you use the @Delegate to mark a Map as a Delegate you'll get an error:

java.lang.NullPointerException: Cannot invoke method put() on null object

It can be illustrated with this example:

class Test {
@Delegate Map mp
}

def t = new Test(mp: new HashMap())

println t.keySet()

I originally noticed it when trying it with a GroovyRowResult (same error as above):

import groovy.sql.GroovyRowResult

class DelegateRowResult {
@Delegate GroovyRowResult row
String foo
}

DelegateRowResult d = new DelegateRowResult( foo: "Boo")
println "$d.foo"