[GROOVY-7648] Problem with @CompileStatic, generic types, and varags

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.4
• Component/s: groovy-jdk
• Assignee: Eric Milles
• Reporter: Adam Augusta
• Created: 27/Oct/15 15:25
• Updated: 08/Mar/22 12:16
• Resolved: 25/Oct/21 16:32

Description

Similar to GROOVY-7182, groovyc fails to handle generic types if a class uses @CompileStatic and the generically typed method has a varargs parameter. Removal of @CompileStatic or the varargs parameter eliminates the compile error.

(Clarification: methodOn need not be defined in the @CompileStatic class. In the original case, the method was ControllerLinkBuilder#methodOn from Spring's HATEOAS library.)

VarArgsGenericsCase.groovy

import groovy.transform.CompileStatic

@CompileStatic
class VarArgsGenericsCase {

    def markus(String name) {
        methodOn(VarArgsGenericsCase).markus(name)
    }

    static <T> T methodOn(Class<T> clazz, Object... parameters) {
        return clazz.newInstance()
    }
}

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
VarArgsGenericsCase.groovy: 7: [Static type checking] - Cannot find matching method java.lang.Object#markus(java.lang.String). Please check if the declared type is correct and if the method exists.
 @ line 7, column 9.
           methodOn(VarArgsGenericsCase).markus(name)
           ^

1 error

Issue Links

• relates to: GROOVY-7182 Static type error when using generic methods and Closures as parameters