Я случайно получаю org.datanucleus.exceptions.ClassNotPersistableException, когда пытаюсь выполнить запрос в локальном хранилище JDO моего приложения GWT/App Engine. Это происходит только при запуске приложения в режиме Hosted. Когда я развертываю его в Google App Engine, все работает отлично.
Трассировка стека:
org.datanucleus.exceptions.ClassNotPersistableException: The class "com.wayd.server.beans.WinePost" is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data/annotations for the class are not found.
at org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:305)
at org.datanucleus.ObjectManagerImpl.getExtent(ObjectManagerImpl.java:3700)
at org.datanucleus.jdo.JDOPersistenceManager.getExtent(JDOPersistenceManager.java:1515)
at com.wayd.server.WinePostServiceImpl.getPosts(WinePostServiceImpl.java:212)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527)
... 25 more
Caused by: org.datanucleus.exceptions.ClassNotPersistableException: The class "com.wayd.server.beans.WinePost" is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data/annotations for the class are not found.
at org.datanucleus.ObjectManagerImpl.assertClassPersistable(ObjectManagerImpl.java:3830)
at org.datanucleus.ObjectManagerImpl.getExtent(ObjectManagerImpl.java:3693)
... 32 more)
Класс WinePost - это очень простой класс, поддерживающий JDO:
@PersistenceCapable (identityType = IdentityType.APPLICATION) открытый класс WinePost {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;
@Persistent
private User author;
@Persistent
private String grape;
@Persistent
private String comment;
public WinePost(final User author, final String grape,
final String comment) {
super();
this.grape = grape;
this.comment = comment;
}
public User getAuthor() {
return author;
}
public void setAuthor(final User author) {
this.author = author;
}
public Long getId() {
return id;
}
public void setId(final Long id) {
this.id = id;
}
public String getGrape() {
return grape;
}
public void setGrape(final String grape) {
this.grape = grape;
}
public String getComment() {
return comment;
}
public void setComment(final String comment) {
this.comment = comment;
}
public String getUserNickname() {
String retVal = null;
if (author != null) {
retVal = author.getNickname();
}
return retVal;
}
public WinePostModel getWinePostModel() {
final WinePostModel winePostModel = new WinePostModel(grape, vintage, getUserNickName());
return winePostModel;
}
}
Запрос хранилища данных выполняется следующим способом:
public ArrayList<WinePostModel> getPosts() {
final ArrayList<WinePostModel> posts = new ArrayList<WinePostModel>();
final PersistenceManager persistenceManager = PMF.get()
.getPersistenceManager();
final Extent<WinePost> winePostExtent = persistenceManager.getExtent(
WinePost.class, false);
for (final WinePost winePost : winePostExtent) {
posts.add(winePost.getWinePostModel());
}
winePostExtent.closeAll();
return posts;
}
