[GROOVY-9353] Metaclass constructor overriding not working for a method inside of @CompileStatic annotated class

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 2.4.10
• Component/s: groovy-jdk
• Labels: metaClass metaprogramming

Environment

```
------------------------------------------------------------
Gradle 3.5
------------------------------------------------------------

Groovy: 2.4.10,
Ant: Apache Ant(TM) version 1.9.6 compiled on June 29 2015,
JVM: 1.8.0_221 (Oracle Corporation 25.221-b11),
OS: Mac OS X 10.15.2 x86_64
```

• Flags: Important
• External issue URL: https://stackoverflow.com/questions/59476058/metaclass-constructor-overriding-not-working-for-a-method-inside-of-compilestat

Docs Text

According to the Groovy Lang doc:
```
MockFor and StubFor can not be used to test statically compiled classes e.g for Java classes or Groovy classes that make use of @CompileStatic. To stub and/or mock these classes you can use Spock or one of the Java mocking libraries.
```

• Assignee: Unassigned
• Reporter: Viplav Soni
• Created: 25/Dec/19 08:38
• Updated: 26/Jan/20 23:59
• Resolved: 26/Jan/20 23:59

Description

When we use `someClass.metaClass.constructor for any specific class (like RESTClient) available inside the method of a class which is annotated with @CompileStatic, constructor overriding is not working at all.

When we removed the `@CompileStatic` annotation, this works properly. Am I missing something?

 

Sample Code:

 

```

@CompileStatic

class FooClass {

 String getDataFromProvider() {

        String url = "https://www.example.com"

                   RESTClient restClient = new RESTClient(url)         

                  HttpResponseDecorator response = restClient.post([:]) as HttpResponseDecorator  

        return response

          }

}
```

And the test case:

```
 
import groovyx.net.http.HttpResponseDecorator

import groovyx.net.http.RESTClient

import spock.lang.Specification

class FooContentSpec extends Specification {

     void "test getDataFromProvider method"() {

        given: "Rest url"

        String restURL = "https://www.example.com"

        and: "Mock RESTClient"

        RESTClient mockedRestClient = Mock(RESTClient)

        // THIS IS NOT WORKING

        RESTClient.metaClass.constructor = { Object url ->

          assert restURL == url

          return mockedRestClient

                  }

        mockedRestClient.metaClass.post = { Map<String, ?> args ->                        return ""

       }

        when: "We hit the method"

        HttpResponseDecorator response = Content.getDataFromProvider()

                   then: "We should get status 200" 

        response.statusCode==200

     }

}
```