[appengine-java] Querying sub objects with JDOQL in GAE/J

[enthusiast]

I have a very basic question about JDOQL with GAE/J. Hope someone can
shine light on this:

I have modeled two persistent objects Employee and ContactInfo such
that Employee contains an instance of ContactInfo, as follows:

ContactInfo.java

import com.google.appengine.api.datastore.Key;
// ... imports ...

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class ContactInfo {
    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;

    @Persistent
    private String city;

    // ...
}


Employee.java

import ContactInfo;
// ... imports ...

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Employee {
    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;

    @Persistent
    private Integer salary;

    @Persistent
    private ContactInfo contactInfo;

    Integer getSalary() {
        return salary;
    }

    void setSalary(Integer salary) {
        this.salary = salary;
    }

    ContactInfo getContactInfo() {
        return contactInfo;
    }

    void setContactInfo(ContactInfo contactInfo) {
        this.contactInfo = contactInfo;
    }

    // ...
}

I am able to create instances of Employee with relevant ContactInfo
objects. However, I am not able to query for Employee which uses a
field on the ContactInfo object. E.g. If I want to retrieve only those
employees whose salary > 10000 AND ContactInfo.city == "New York", how
do I construct such a query?

If I just want to query on the field in the Employee object, I get the
results, but when I use a field in the sub-object of Employee (i.e.
ContactInfo) I get an error.

Any help???
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