HelloController.java

package slim3.controller;

import org.slim3.controller.Controller;
import org.slim3.controller.Navigation;
import org.slim3.datastore.Datastore;

import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.Transaction;

public class HelloController extends Controller {

    @Override
    public Navigation run() throws Exception {
        Entity entity = new Entity("Test", "k");
        Datastore.put(entity);

        Transaction tx = Datastore.beginTransaction();
        entity.setProperty("p", 0);
        Datastore.put(tx, entity); // これがすりぬけてる感じ
        Datastore.rollback(tx);

        if (Datastore.get(entity.getKey()).getProperty("p") != null) {
            throw new IllegalStateException();
        }
        return forward("Hello.jsp");
    }
}

App Engine SDK: 1.3.2
Slim3: 1.0.2
Production

DatastoreUtil.put のなかでPb触ってる感じ