Google Appengine - id爲「com.google.appengine.api.datastore.Key：Product（」Potatoe「）」的對象由不同的對象管理器管理

Question

嗨，我碰到了「由不同對象管理器管理的常見錯誤「

我在網上看了一圈，沒有找到適合我的問題的解決方案。我在JSP頁面中調用以下代碼

PersistenceManager pm = PMF.get().getPersistenceManager(); 
String query = "SELECT FROM " +Location.class.getName(); 
List<Location> locTs = (List<Location>) pm.newQuery(query).execute(); 
for (Location location : locTs) { 
    location.genRes(pm); 
} 
pm.close(); 
return "done"; 

location.genRes

public void genRes(PersistenceManager pm) { 
Key product = this.getLtype(pm).getProductKey(); 
String query = "SELECT FROM " + LocationInventry.class.getName() + " WHERE location == '"+key.getId()+"' && product == '"+product.getId()+"'"; 
List<LocationInventry> lvd = (List<LocationInventry>) pm.newQuery(query).execute(); 
if (lvd.size() == 0) { 
    LocationInventry locationInventry = new LocationInventry(product, this); 
    pm.makePersistent(locationInventry); 
} 
else { 
    lvd.get(0).gen(); 
} 
} 

被扔在pm.makePersistent（locationInventry）錯誤;

據我所知，我只使用一個持久性管理，並在使用後關閉它。謝謝你的幫助。

Object with id "com.google.appengine.api.datastore.Key:Product("Potatoe")" is managed by a different Object Manager 
org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:375) 
org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:674) 
org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:694) 
net.sparktank.quilage.datastore.Location.genRes(Location.java:220) 
net.sparktank.quilage.server.MainRunner.genResources(MainRunner.java:239) 
org.apache.jsp.server.generateResources_jsp._jspService(generateResources_jsp.java:45) 
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:806) 

Answer 1

我前一段時間有同樣的問題，我有我的jdoconfig.xml文件丟失或配置不正確記憶模糊。 查看http://code.google.com/appengine/docs/java/datastore/usingjdo.html瞭解更多詳情。