HibernateIdEqualsVerifier.java

import static org.junit.Assert.fail;

import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;

import javax.persistence.EmbeddedId;
import javax.persistence.IdClass;

import org.reflections.Reflections;
import org.reflections.scanners.FieldAnnotationsScanner;
import org.reflections.scanners.SubTypesScanner;
import org.reflections.scanners.TypeAnnotationsScanner;

import nl.jqno.equalsverifier.EqualsVerifier;
import nl.jqno.equalsverifier.EqualsVerifierApi;
import nl.jqno.equalsverifier.EqualsVerifierReport;
import nl.jqno.equalsverifier.Warning;
/**
 * <pre>{@code
 public class EqualsTest {
    @Test
    public void verifyHibernateEquals() throws Exception {
        HibernateIdEqualsVerifier.verify(Application.class.getPackage().getName());
    }
  }
 * }</pre>
 */
public class HibernateIdEqualsVerifier { 
    public static void verify(String basePackage) {
        Reflections reflections = new Reflections(basePackage, //
                new SubTypesScanner(), //
                new TypeAnnotationsScanner(), //
                new FieldAnnotationsScanner());
        Set<Class<?>> checkedClasses = new HashSet<>();

        reflections.getTypesAnnotatedWith(IdClass.class).stream()//
        .map(c -> c.getAnnotation(IdClass.class))//
        .map(IdClass::value)//
        .forEach(checkedClasses::add);

        reflections.getFieldsAnnotatedWith(EmbeddedId.class).stream()//
        .map(f -> f.getType())//
        .forEach(checkedClasses::add);

        String report = checkedClasses.stream()//
                .map(HibernateIdEqualsVerifier::configureVerifier)
                .map(EqualsVerifierApi::report)//
                .filter(r -> ! r.isSuccessful())//
                .map(EqualsVerifierReport::getMessage)//
                .collect(Collectors.joining("\n"));
        if(! report.isEmpty())
            fail(report);
    }

    private static <T> EqualsVerifierApi<T> configureVerifier(Class<T> checkedClass){
        return EqualsVerifier.forClass(checkedClass).usingGetClass()//
                .suppress(Warning.NONFINAL_FIELDS);
    }
}