[GROOVY-10723] Closure in parent class can't access private method in same class when called from a child class

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate

Language

groovy

• Assignee: Unassigned
• Reporter: Leonard Brünings
• Created: 16/Aug/22 17:45
• Updated: 17/Jul/23 14:51
• Resolved: 18/Aug/22 15:01

Description

Private method of parent class can't be accessed by closure when called from a child class:

class Child extends BaseClass {
    static void main(String... args) {
        println new Child().doStuff([1,2])
    }
}

class BaseClass {
    private int helper(int a) {
        a + 1
    }
    
    def doStuff(List<Integer> numbers) {
        numbers.collect {
         	helper(it)   
        }
    }
} 

WebConsole

org.codehaus.groovy.runtime.InvokerInvocationException: groovy.lang.MissingMethodException: No signature of method: Child.helper() is applicable for argument types: (Integer) values: [1]
Possible solutions: sleep(long), every(), grep(), every(groovy.lang.Closure), sleep(long, groovy.lang.Closure)
	at BaseClass.invokeMethod(Script1.groovy)
Caused by: groovy.lang.MissingMethodException: No signature of method: Child.helper() is applicable for argument types: (Integer) values: [1]
Possible solutions: sleep(long), every(), grep(), every(groovy.lang.Closure), sleep(long, groovy.lang.Closure)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:70)

When using a classical foreach loop it works

class Child extends BaseClass {
    static void main(String... args) {
        println new Child().doStuff([1,2])
    }
}

class BaseClass {
    private int helper(int a) {
        a + 1
    }
    
    def doStuff(List<Integer> numbers) {
        def result = []
        for (int it in numbers){
			result << helper(it)
        }
        result
    }
}

WebConsole

Removing the private modifier also fixes this problem.

Issue Links

• duplicates: GROOVY-2433 Closure in base class unable to call private methods when invoked from derived class
• duplicates: GROOVY-5438 Private field inaccessible in closure when using a subclass