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Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 2 posts ] 
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 Post subject: java.math.BigDecimal cannot be cast to java.lang.String OGM5
PostPosted: Fri Apr 08, 2016 5:58 pm 
Newbie

Joined: Thu Apr 07, 2016 8:39 am
Posts: 3
OGM version: 5.0.0.Beta1
Cassandra version: 2.2.5

One of the data types I have for an attribute in the Cassandra keyspace entity I am trying to retrieve data from is a DECIMAL, having had a look around it seems it is recommended that for this type, the java equivalent should be BigDecimal, therefore I used this for this particular attribute in my table POJO and recieved:

Exception in thread "main" java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.String
at org.hibernate.ogm.type.descriptor.impl.StringMappedGridExtractor.extract(StringMappedGridExtractor.java:32)
at org.hibernate.ogm.type.impl.AbstractGenericBasicType.nullSafeGet(AbstractGenericBasicType.java:220)
at org.hibernate.ogm.type.impl.AbstractGenericBasicType.nullSafeGet(AbstractGenericBasicType.java:216)
at org.hibernate.ogm.type.impl.AbstractGenericBasicType.nullSafeGet(AbstractGenericBasicType.java:207)
at org.hibernate.ogm.type.impl.AbstractGenericBasicType.hydrate(AbstractGenericBasicType.java:296)
at org.hibernate.ogm.persister.impl.OgmEntityPersister.hydrateValue(OgmEntityPersister.java:996)
at org.hibernate.ogm.persister.impl.OgmEntityPersister.hydrate(OgmEntityPersister.java:941)
at org.hibernate.ogm.loader.impl.OgmLoader.loadFromResultSet(OgmLoader.java:1157)
at org.hibernate.ogm.loader.impl.OgmLoader.instanceNotYetLoaded(OgmLoader.java:1064)
at org.hibernate.ogm.loader.impl.OgmLoader.getRow(OgmLoader.java:958)
at org.hibernate.ogm.loader.impl.OgmLoader.getRowFromResultSet(OgmLoader.java:497)
at org.hibernate.ogm.loader.impl.OgmLoader.doQuery(OgmLoader.java:372)
at org.hibernate.ogm.loader.impl.OgmLoader.doQueryAndInitializeNonLazyCollections(OgmLoader.java:282)
at org.hibernate.ogm.loader.impl.OgmLoader.loadEntity(OgmLoader.java:201)
at org.hibernate.ogm.loader.impl.OgmLoader.load(OgmLoader.java:157)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3955)
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:491)
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:456)
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:199)
at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:261)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:137)
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129)
at org.hibernate.internal.SessionImpl.access$2600(SessionImpl.java:164)
at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2696)
at org.hibernate.internal.SessionImpl.get(SessionImpl.java:975)
at org.hibernate.engine.spi.SessionDelegatorBaseImpl.get(SessionDelegatorBaseImpl.java:630)

Now I have tried replacing the BigDecimal to different types like long and double which causes an earlier datatype error, the method that I am calling upon execution is simply:

Code:
public class Main_v2 {
    public static void main(String[] args) {
        //v1
        OgmSession ss = HibernateUtil_v1.openOgmSFSession();
        Transaction trans = ss.beginTransaction();

        long id = 2370256;

        MediaEntity media = ss.get(MediaEntity.class, id);

        trans.commit();

        System.out.println("Capture Device: " + media.getLatitude());
        System.out.println("Date Uploaded: " + media.getUploadDate());

        //v1
        //ss.close();
        HibernateUtil_v1.closeOgmSessionFactory();
    }
}


The MediaEntity POJO with the declared BigDecimal datatype:
Code:
@Entity
@Table(name = "media")
public class MediaEntity implements Serializable{

    private long mediaID;
    private BigDecimal latitude;
    private Date uploadDate;

    public MediaEntity() {}

    @Id
    @Column(name = "media_id", nullable = false)
    public long getMediaID() {
        return mediaID;
    }

    public void setMediaID(long mediaID) {
        this.mediaID = mediaID;
    }

    @Column(name = "latitude")
    public BigDecimal getLatitude() {
        return latitude;
    }

    public void setLatitude(BigDecimal latitude) {
        this.latitude = latitude;
    }

    @Column(name = "date_uploaded")
    public Date getUploadDate() {
        return uploadDate;
    }

    public void setUploadDate(Date uploadDate) {
        this.uploadDate = uploadDate;
    }
}


I'm not converting it to a string myself therefore it must be some background process the OGM framework does, but for some reason this error occurs. The value that I would be expecting to get from Cassandra for this specific media is 54.3. Any ideas folks?

Cheers :>


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 Post subject: Re: java.math.BigDecimal cannot be cast to java.lang.String OGM5
PostPosted: Mon Apr 11, 2016 7:06 am 
Hibernate Team
Hibernate Team

Joined: Fri Sep 09, 2011 3:18 am
Posts: 295
Hi,
Hibernate OGM at the moment stores BigDecimal as text, I've created an issue for it and sent a pull request:

If you could test it and let us know if it solves you issue, that would be great.

Thanks,
Davide


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