修改部分 jsr305 注解的使用。

plusone-basic/plusone-basic-domain/src/main/java/xyz/zhouxy/plusone/constant/EntityStatus.java

@@ -24,12 +24,10 @@ public final class EntityStatus extends Enumeration<EntityStatus> {
     private static final ValueSet<EntityStatus> VALUE_SET = new ValueSet<>(
             AVAILABLE, DISABLED);
 
-    @Nonnull
     public static EntityStatus of(int id) {
         return VALUE_SET.get(id);
     }
 
-    @Nonnull
     public static Collection<EntityStatus> constants() {
         return VALUE_SET.getValues();
     }