[jOOQ/jOOQ#17787] Regression when enabling <jpaAnnotation> for NOT NULL

DEFAULT columns, which should continue to be marked as @Column(nullable
= true)

jOOQ-codegen/src/main/java/org/jooq/codegen/JavaGenerator.java

@@ -10105,7 +10105,7 @@ public class JavaGenerator extends AbstractGenerator {
             }
 
             String nullable = "";
-            if (effectivelyNotNull(out, column))
+            if (!column.getType(resolver(out)).isNullable())
                 nullable = ", nullable = false";
 
             String length = "";