4

I have an Entity class with composite PK as below:
using @Embeddable and @EmbeddedId annotations.

/** The primary key class for the uom_conversion database table. */
@Embeddable
public class UomConversionPK implements Serializable {
    private static final long serialVersionUID = 1L;

    @Column(name="product_id", insertable=false, updatable=false)
    private int productId;

    @Column(name="base_uom_id", insertable=false, updatable=false)
    private int baseUomId;

    @Column(name="to_unit_id", insertable=false, updatable=false)
    private int toUnitId;
    //getters, setters
}

And the Entity which is using it is:

/** The persistent class for the uom_conversion database table. */
@Entity
@Table(name="uom_conversion")
public class UomConversion implements Serializable {
    private static final long serialVersionUID = 1L;

    @EmbeddedId
    private UomConversionPK id;
}

Here Eclipse is displaying error: "UomConversionPK cannot be resolved to a type"

Eclipse error snapshot

In another project I'm using Entities with composite PK without any errors.

Now this seems to be a JPA facet problem, wondering why Eclipse is not able to resolve UomConversionPK or am I doing something wrong ?

JonathanDavidArndt
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Mahesh Kakade
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  • Are you importing `com.itsys.erp.server.dal.entities.UomConversionPK` in your `UonConversion` class? – Kevin Swan Aug 09 '18 at 15:41
  • Both UomConversion and UomConversionPK classes are in same package. And this error is occurring in other Entity classes as well - having composite PK. – Mahesh Kakade Aug 09 '18 at 17:49
  • Are you positive they're in the same package? Eclipse can see your `UomConversionPK` class, but it's not visible from within `UomConversion` without an explicit import, which suggests it's actually in a different package. – Kevin Swan Aug 09 '18 at 17:57

1 Answers1

5

Well this error do occur sometimes for @EmbeddedId annotation, though not always, when creating JPA entities from tables using JPA Tools.

In my case this problem was not resolved until I set the following to Ignore and then back to Error:
Windows -> Preferences -> Java Persistence -> JPA -> Errors/Warnings -> Attribute -> Embedded ID classes should implement hashcode() and equals(). This error occurs even if Embeddable class do have hashcode() and equals() method implementation. May be this works for you as well.

Ahmed Serry
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Swetha N
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