Adds Warning.JPA_GETTER

equalsverifier-core/src/main/java/nl/jqno/equalsverifier/Warning.java

@@ -165,6 +165,19 @@ public enum Warning {
      */
     SURROGATE_OR_BUSINESS_KEY,
 
+    /**
+     * Disables the check that collection fields in JPA, or @Basic fields marked with
+     * FetchType.LAZY, should be accessed through their getter methods in {@code equals} and
+     * {@code hashCode} methods.
+     *
+     * <p>Normally, it is necessary to go through the getter for these fields, because their
+     * content may not be materialized in some instances. Calling the getter will materialize them,
+     * but referencing the field directly will not. This can lead to situations where the
+     * {@code equals} method of objects that should be equal to each other returns false, because
+     * one instance has the content materialized and the other does not.
+     */
+    JPA_GETTER,
+
     /**
      * Disables the check that transient fields not be part of the {@code equals} contract.
      *

equalsverifier-core/src/main/java/nl/jqno/equalsverifier/internal/checkers/FieldsChecker.java

@@ -95,7 +95,10 @@ public void check() {
         }
 
         AnnotationCache cache = config.getAnnotationCache();
-        if (cache.hasClassAnnotation(config.getType(), SupportedAnnotations.ENTITY)) {
+        if (
+            cache.hasClassAnnotation(config.getType(), SupportedAnnotations.ENTITY) &&
+            !config.getWarningsToSuppress().contains(Warning.JPA_GETTER)
+        ) {
             inspector.check(jpaLazyGetterFieldCheck);
         }
     }

equalsverifier-core/src/test/java/nl/jqno/equalsverifier/integration/extra_features/JpaLazyEntityTest.java

@@ -47,41 +47,49 @@ public void basicGetterNotUsed_givenCorrespondingFieldIgnored() {
     @Test
     public void basicGetterUsed_givenAnnotationIsOnGetter() {
         getterNotUsed(IncorrectBasicJpaLazyGetterContainer.class, "equals");
+        getterNotUsed_warningSuppressed(IncorrectBasicJpaLazyGetterContainer.class);
     }
 
     @Test
     public void basicGetterNotUsedInHashCode() {
         getterNotUsed(IncorrectBasicJpaLazyFieldContainerHashCode.class, "hashCode");
+        getterNotUsed_warningSuppressed(IncorrectBasicJpaLazyFieldContainerHashCode.class);
     }
 
     @Test
     public void basicGetterNotUsed() {
         getterNotUsed(IncorrectBasicJpaLazyFieldContainer.class, "equals");
+        getterNotUsed_warningSuppressed(IncorrectBasicJpaLazyFieldContainer.class);
     }
 
     @Test
     public void oneToOneGetterNotUsed() {
         getterNotUsed(IncorrectOneToOneJpaLazyFieldContainer.class, "equals");
+        getterNotUsed_warningSuppressed(IncorrectOneToOneJpaLazyFieldContainer.class);
     }
 
     @Test
     public void oneToManyGetterNotUsed() {
         getterNotUsed(IncorrectOneToManyJpaLazyFieldContainer.class, "equals");
+        getterNotUsed_warningSuppressed(IncorrectOneToManyJpaLazyFieldContainer.class);
     }
 
     @Test
     public void manyToOneGetterNotUsed() {
         getterNotUsed(IncorrectManyToOneJpaLazyFieldContainer.class, "equals");
+        getterNotUsed_warningSuppressed(IncorrectManyToOneJpaLazyFieldContainer.class);
     }
 
     @Test
     public void manyToManyGetterNotUsed() {
         getterNotUsed(IncorrectManyToManyJpaLazyFieldContainer.class, "equals");
+        getterNotUsed_warningSuppressed(IncorrectManyToManyJpaLazyFieldContainer.class);
     }
 
     @Test
     public void elementCollectionGetterNotUsed() {
         getterNotUsed(IncorrectElementCollectionJpaLazyFieldContainer.class, "equals");
+        getterNotUsed_warningSuppressed(IncorrectElementCollectionJpaLazyFieldContainer.class);
     }
 
     @Test
@@ -131,6 +139,13 @@ private void getterNotUsed(Class<?> type, String method) {
             .assertMessageContains("JPA Entity", method, "direct reference");
     }
 
+    private void getterNotUsed_warningSuppressed(Class<?> type) {
+        EqualsVerifier
+            .forClass(type)
+            .suppress(Warning.JPA_GETTER, Warning.NONFINAL_FIELDS)
+            .verify();
+    }
+
     @Entity
     static class CorrectJpaLazyFieldContainer {