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alsutton
 Post subject: java.lang.ClassCastException: java.math.BigInteger for long
PostPosted: Fri Apr 28, 2006 1:21 pm 
Newbie

Joined: Fri Apr 28, 2006 1:09 pm
Posts: 9
I'm a hibernate newbie, but I've been through the docs and have been reading the Pro Hibernate 3 book, so I'm hoping this is nothing too dumb.

I've been writing a simple feed reader test application and I'm trying to write an application which will count the number of FeedSubscriptions for a specific feed and store it the corresponding FeedDetails object. The only problem is I hit an exception whenever I try to set the count via the FeedDetails setter method, and the value is not updated. The setter for the relevant field takes a long (i.e. setSubscriberCount(long newCount)), the value passed to the setter is a long, yet the exception is thrown and the count is not update (note: long as in primitive, not Long as in the object).

Code and mapping files below with a comment showing the line at which the exception is thrown.

Any help/pointers appricated.

Al.




Hibernate version:

3.1.3

Mapping documents:

FeedDetails

Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

    <class name="info.rss2mail.objects.FeedDetails">
        <id name="id">
            <generator class="native"/>
        </id>
      <property name="url" unique="true" index="feed_url_idx" />
      <property name="editorEmail" />
      <property name="blocked" />
      <property name="title" />
      <property name="lastScanned"/>
      <property name="nextScanDue"/>
      <property name="lastScanCode"/>
      <property name="subscriberCount"/>

       <set name="feedItems" table="FEED_ITEMS_MAP" lazy="true">
           <key column="feed_id"/>
           <one-to-many class="info.rss2mail.objects.FeedItem"/>
       </set>
               
    </class>

</hibernate-mapping>


Feed Subscription

Code:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

    <class name="info.rss2mail.objects.FeedSubscription">
        <id name="id">
            <generator class="native"/>
        </id>
      <property name="subscriptionLevel"/>
      <property name="subscriptionTime"/>
      <property name="lastMailingTime"/>
      <property name="active"/>

      <many-to-one   name="user"
                  lazy="false"
                  class="info.rss2mail.objects.User" />

      <many-to-one   name="feedDetails"
                   lazy="false"
                   class="info.rss2mail.objects.FeedDetails" />
    </class>

</hibernate-mapping>


Code between sessionFactory.openSession() and session.close():
Code:
      Transaction tx = null;
      try {
         tx = session.beginTransaction();

         int flushCount = 0;
         
         
         SQLQuery query = session.createSQLQuery("select id, count(*) from FeedSubscription group by id");
         List results = query.list();
          Iterator iter = results.iterator();
          while(iter.hasNext()) {
             Object[] data = (Object[]) iter.next();
             
             FeedDetails theFeed = (FeedDetails) session.load(FeedDetails.class, (Number)data[0]);
             long value = ((Number)data[1]).longValue();
/*EXCEPTION HERE:*/   theFeed.setSubscriberCount(value);
             System.out.println(theFeed.getId()+":"+value);
             session.update(theFeed);
             
             flushCount++;
             if(flushCount == 10) {
                session.flush();
             }
          }
         
         tx.commit();
         tx = null;
      } finally {
         if( tx != null ) {
            tx.rollback();
         }
      }



Full stack trace of any exception that occurs:

Exception in thread "main" java.lang.ClassCastException: java.math.BigInteger
at org.hibernate.type.LongType.set(LongType.java:42)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:83)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:65)
at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1514)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1576)
at org.hibernate.loader.Loader.doQuery(Loader.java:661)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1785)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:47)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:41)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:2730)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:365)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:346)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:123)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:82)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:862)
at org.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:820)
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:62)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:98)
at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:158)
at info.rss2mail.objects.FeedDetails$$EnhancerByCGLIB$$69b7ee90.setSubscriberCount(<generated>)
at info.rss2mail.backend.feedranker.FeedRanker.main(FeedRanker.java:52)


Name and version of the database you are using:

MySQL 3.23

The generated SQL (show_sql=true):

Hibernate: select id, count(*) from FeedSubscription group by id
Hibernate: select feeddetail0_.id as id0_0_, feeddetail0_.url as url0_0_, feeddetail0_.editorEmail as editorEm3_0_0_, feeddetail0_.blocked as blocked0_0_, feeddetail0_.title as title0_0_, feeddetail0_.lastScanned as lastScan6_0_0_, feeddetail0_.nextScanDue as nextScan7_0_0_, feeddetail0_.lastScanCode as lastScan8_0_0_, feeddetail0_.subscriberCount as subscrib9_0_0_ from FeedDetails feeddetail0_ where feeddetail0_.id=?

Debug level Hibernate log excerpt:

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select id, count(*) from FeedSubscription group by id
Hibernate: select feeddetail0_.id as id0_0_, feeddetail0_.url as url0_0_, feeddetail0_.editorEmail as editorEm3_0_0_, feeddetail0_.blocked as blocked0_0_, feeddetail0_.title as title0_0_, feeddetail0_.lastScanned as lastScan6_0_0_, feeddetail0_.nextScanDue as nextScan7_0_0_, feeddetail0_.lastScanCode as lastScan8_0_0_, feeddetail0_.subscriberCount as subscrib9_0_0_ from FeedDetails feeddetail0_ where feeddetail0_.id=?
Exception in thread "main" java.lang.ClassCastException: java.math.BigInteger
at org.hibernate.type.LongType.set(LongType.java:42)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:83)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:65)
at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1514)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1576)
at org.hibernate.loader.Loader.doQuery(Loader.java:661)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1785)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:47)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:41)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:2730)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:365)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:346)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:123)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:82)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:862)
at org.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:820)
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:62)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:98)
at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:158)
at info.rss2mail.objects.FeedDetails$$EnhancerByCGLIB$$69b7ee90.setSubscriberCount(<generated>)
at info.rss2mail.backend.feedranker.FeedRanker.main(FeedRanker.java:52)
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neketsushonen
 Post subject: I guess
PostPosted: Fri Apr 28, 2006 2:22 pm 
Regular
Regular

Joined: Wed Feb 22, 2006 11:28 am
Posts: 65
Location: Santiago, Chile
Hello Friend:

After reading ur problem:

A. Can you post your JAVA CODE of that Object [b]"FeedDetails"[/b]
B. I think the problem line site: long value = ((Number)data[1]).longValue();

You can try to cast data[1] like this:
[u]long value = Long.parseLong(String.valueOf(data[1]));[/u]

I hope that can help u.

Requests for comments.
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alsutton
 Post subject:
PostPosted: Fri Apr 28, 2006 3:21 pm 
Newbie

Joined: Fri Apr 28, 2006 1:09 pm
Posts: 9
Many thanks for the ideas, unfortunatley the combination of Long and String methods didn't work, it leaves me with the same exception :(.

The code you asked for is as follows;

Code:
package info.rss2mail.objects;

import java.util.Set;

public class FeedDetails {

   private Long id;
   
   private String url;
   private String editorEmail;
   private Boolean blocked;
   private String title;
   private long lastScanned;
   private long nextScanDue;
   private int lastScanCode;
   private long subscriberCount;
   
   private Set feedItems;
   
   public Boolean getBlocked() {
      return blocked;
   }
   public void setBlocked(Boolean blocked) {
      this.blocked = blocked;
   }
   public String getEditorEmail() {
      return editorEmail;
   }
   public void setEditorEmail(String editorEmail) {
      this.editorEmail = editorEmail;
   }
   public Long getId() {
      return id;
   }
   protected void setId(Long id) {
      this.id = id;
   }
   public int getLastScanCode() {
      return lastScanCode;
   }
   public void setLastScanCode(int lastScanCode) {
      this.lastScanCode = lastScanCode;
   }
   public long getLastScanned() {
      return lastScanned;
   }
   public void setLastScanned(long lastScanned) {
      this.lastScanned = lastScanned;
   }
   public String getTitle() {
      return title;
   }
   public void setTitle(String newTitle) {
      title = newTitle;
   }
   public long getNextScanDue() {
      return nextScanDue;
   }
   public void setNextScanDue(long nextScanDue) {
      this.nextScanDue = nextScanDue;
   }
   public String getUrl() {
      return url;
   }
   public void setUrl(String url) {
      this.url = url;
   }
   public long getSubscriberCount() {
      return subscriberCount;
   }
   public void setSubscriberCount(long count) {
      subscriberCount = count;
   }

   /**
    * Get the list of items from this feed.
    */
   
   public Set getFeedItems() {
      return feedItems;
   }

   /**
    * Set the list of items for this feed.
    */
   
   public void setFeedItems( Set newFeedItems ) {
      feedItems = newFeedItems;
   }
}
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sudhirph
 Post subject:
PostPosted: Sat Apr 29, 2006 5:39 am 
Beginner
Beginner

Joined: Thu Apr 20, 2006 3:44 am
Posts: 32
could you please make change as follows and try

<property name="subscriberCount" type="long"/>
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alsutton
 Post subject:
PostPosted: Sat Apr 29, 2006 9:02 am 
Newbie

Joined: Fri Apr 28, 2006 1:09 pm
Posts: 9
Thanks for the idea, but still not joy :(, same exception, same place.
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alsutton
 Post subject: Problem Solved
PostPosted: Sat Apr 29, 2006 11:38 am 
Newbie

Joined: Fri Apr 28, 2006 1:09 pm
Posts: 9
After some playing around I've found a fix, it appears that the exception is actually caused by the id passed to the load method (I'm guessing that the object is only fetched when I call the setter despite the code saying reading as if it's called earlier).

This means that the following code works;

Code:
Long feedId = new Long(((Number)data[0]).longValue());
FeedDetails theFeed = (FeedDetails) session.load(FeedDetails.class, feedId);
long value = Long.parseLong(String.valueOf(data[1]));
theFeed.setSubscriberCount(value);


It seems strange that the object returned for the ID column isn't actually an object compatible with the ID column, but I guess every system has it's funnies.

Many thanks to everyone who spent time looking at this and thinking about it.

Al.
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