我有一个Entry
使用 Spring LDAP ODM 的映射(“实体”)。当我使用这个类运行单元测试时,我会在初始化时在控制台中收到警告:
Mar 9, 2012 2:32:40 PM org.springframework.ldap.odm.core.impl.ObjectMetaData <init>
WARNING: The Entry class Superhero should be declared final
映射的类如下所示:
@Entry(objectClasses = {"batman", "superman", "spiderman", "dontworryaboutthese"})
public class Superhero {
@Id
@JsonIgnore
private Name dn;
...
我无法通过 Google 搜索找到与此警告相关的任何内容。这是记录它的 Spring 代码:
public ObjectMetaData(Class<?> clazz) {
if (LOG.isDebugEnabled()) {
LOG.debug(String.format("Extracting metadata from %1$s", clazz));
}
// Get object class metadata - the @Entity annotation
Entry entity = (Entry)clazz.getAnnotation(Entry.class);
if (entity != null) {
// Default objectclass name to the class name unless it's specified
// in @Entity(name={objectclass1, objectclass2});
String[] localObjectClasses = entity.objectClasses();
if (localObjectClasses != null && localObjectClasses.length > 0 && localObjectClasses[0].length() > 0) {
for (String localObjectClass:localObjectClasses) {
objectClasses.add(new CaseIgnoreString(localObjectClass));
}
} else {
objectClasses.add(new CaseIgnoreString(clazz.getSimpleName()));
}
} else {
throw new MetaDataException(String.format("Class %1$s must have a class level %2$s annotation", clazz,
Entry.class));
}
// Check the class is final
if (!Modifier.isFinal(clazz.getModifiers())) {
LOG.warn(String.format("The Entry class %1$s should be declared final", clazz.getSimpleName()));
}
...
任何见解将不胜感激。我知道将一个类声明为 final 意味着它不能被扩展,但是 Spring ODM 为什么会关心呢?