[GROOVY-11030] CompileStatic: string concatenation in method parameter default value results in NoSuchMethodError

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.0.9, 4.0.11
• Fix Version/s: 4.0.12
• Component/s: Compiler, Static compilation
• Assignee: Eric Milles
• Reporter: Jason Garrett
• Created: 27/Apr/23 17:57
• Updated: 23/Aug/23 09:07
• Resolved: 27/Apr/23 19:17

Description

If a method parameter's default value is defined by concatenating a String literal to a String variable, calling the method throws java.lang.NoSuchMethodError.

import groovy.transform.CompileStatic
import spock.lang.Specification

@CompileStatic  // works without CompileStatic
class MyClass {
    String makePlural(String word, String plural = word + "s") {  // java.lang.NoSuchMethodError: 'java.lang.String java.lang.String.plus(java.lang.CharSequence)'
        return plural
    }
}

class Test extends Specification {
    def test() {
        setup:
            MyClass myObj = new MyClass()
        expect:
            myObj.makePlural("word") == "words"
    }
}    

Live demo.

A workaround is to do the concatenation in a GString:

String makePlural(String word, String plural = "${word}s") { 

Issue Links

• is related to: GROOVY-11023 SC: IncompatibleClassChangeError when closure direct-targets extension method