jdo

问题 I am trying to build my first Google App Engine WAR and am setting up my own external (outside of Eclipse) Ant build to be executed from the terminal. I'm trying to get the <enhance_war/> Ant macro working and am running into a bizarre NoSuchMethodError . Here's my Ant target: <target name="package" depends="gendocs"> <echo message="Enhancing WAR JDO classes." /> <enhance_war war="war" /> <echo message="Packaging the WAR file." /> <war destfile="gen/dist/myapp.war" webxml="war/web.xml">

问题 I am trying to build my first Google App Engine WAR and am setting up my own external (outside of Eclipse) Ant build to be executed from the terminal. I'm trying to get the <enhance_war/> Ant macro working and am running into a bizarre NoSuchMethodError . Here's my Ant target: <target name="package" depends="gendocs"> <echo message="Enhancing WAR JDO classes." /> <enhance_war war="war" /> <echo message="Packaging the WAR file." /> <war destfile="gen/dist/myapp.war" webxml="war/web.xml">

问题 I am getting the following error message: org.datanucleus.exceptions.NucleusUserException: Object Manager has been closed I have read up on everything I could find on it but I still don't understand what is causing it. I am about to give up and switch to an SQL DB if I cannot resolve this simple issue. Yes I am closing the pm: static void persistAll(Object[] objs) { PersistenceManager pm = PMF.get().getPersistenceManager(); Transaction tx = pm.currentTransaction(); try { tx.begin(); for

问题 I am getting the following error message: org.datanucleus.exceptions.NucleusUserException: Object Manager has been closed I have read up on everything I could find on it but I still don't understand what is causing it. I am about to give up and switch to an SQL DB if I cannot resolve this simple issue. Yes I am closing the pm: static void persistAll(Object[] objs) { PersistenceManager pm = PMF.get().getPersistenceManager(); Transaction tx = pm.currentTransaction(); try { tx.begin(); for

问题 I've got a Product POJO that looks like. @PersistenceCapable(identityType = IdentityType.APPLICATION) public class Product extends AbstractModel { @Persistent private String name; @Persistent private Key homePage; @Persistent private Boolean featured; public String getName() { return name; } public void setName(String name) { this.name = name; } public Key getHomePage() { return homePage; } public void setHomePage(Key homePage) { this.homePage = homePage; } public boolean isFeatured() {

问题 I've been trying to get JDO working with parent/child relationships, but I'm not having much success. Using the relationship setup as seen here and queries as seen here, I want to be able to link a child to a parent, then be able to query for all children of a given parent. Unfortunately, I don't seem to be querying the children correctly. I keep getting the error: Class Parent for query has not been resolved. Check the query and any imports/aliases specification Here's what my code looks

问题 iam trying to persist a Hashmap data in JDO. initially i created a Hashmap like Map<Integer,String> dat=new HashMap<Integer,String>(); and this worked perfectly and i was able to save data., but when i tried Map<Integer, ArrayList<String>> dat=new HashMap<Integer,ArrayList<String>>(); i got an error like this data: java.util.ArrayList is not a supported property type. am i using a non supported data type ?? is there a better alternative ?? i am just doing this for learning purpose ...so your

问题 Using JDO and Persistence, I'm able to successfully store an ArrayList field and retrieve it from a class later. Unfortunately, arrays like myobject[][][] are not supported, as stated in documentation. I tried ArrayList<ArrayList<myobject>> , but this gives many errors, and careful reading of the documentation would seem to suggest this may not be possible. Is it possible to persist an array of two or more dimensions? If so, what is the most correct way to do this? 回答1: If you want multiple

问题 I am using DataNucleus 3.0.0-release JDO implementation to connect my Java app to MongoDB. The related JARs in my CLASSPATH are as follows: datanucleus-api-jdo-3.0.0-release.jar datanucleus-core-3.0.0-release.jar datanucleus-jdo-query-3.0.0-release.jar datanucleus-mongodb-3.0.0-release.jar mongo-java-driver-2.5.2.jar The class that I am persisting is as follows: @PersistenceCapable(detachable = "true") public class Record implements Serializable, Cacheable<String> { private static final long

问题 I am using DataNucleus 3.0.0-release JDO implementation to connect my Java app to MongoDB. The related JARs in my CLASSPATH are as follows: datanucleus-api-jdo-3.0.0-release.jar datanucleus-core-3.0.0-release.jar datanucleus-jdo-query-3.0.0-release.jar datanucleus-mongodb-3.0.0-release.jar mongo-java-driver-2.5.2.jar The class that I am persisting is as follows: @PersistenceCapable(detachable = "true") public class Record implements Serializable, Cacheable<String> { private static final long