Data service JPA query doesnt compile when invoked from a Java class

### Steps to Reproduce

1. Build the application

### Expected Behaviour

No compile error

### Actual Behaviour
```
/home/olav/dataquerybug/build/tmp/compileGroovy/groovy-java-stubs/com/example/BookService.java:13: error: element value must be a constant expression
@grails.gorm.services.Query(value=null) java.util.List getTitles();
^
1 error
startup failed:
Compilation failed; see the compiler error output for details.

1 error

FAILURE: Build failed with an exception.
```

### Environment Information

- **Operating System**: Ubuntu 18.04
- **GORM Version:** 7.0.0
- **Grails Version ** 4:00
- **JDK Version:** Openjdk 11

### Example Application

https://github.com/olavgg/dataquerybug

Reproduce the failure by building the linked example application with the stated Grails, GORM, and JDK versions. Start with the generated compileGroovy stub at build/tmp/compileGroovy/groovy-java-stubs/com/example/BookService.java and the data service query that produces it. Done means the application builds without the reported constant-expression compile error.

Written by the indexing model from the issue text.