My code here: Employee Class: @PersistenceCapable(identityType = IdentityType.APPLICATION,detachable="true") public class Employee implements Serializable { private static final long serialVersionUID = 1L; @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true") private String id; @Persistent private String ename; @Persistent private String designation; @Persistent(mappedBy="parentEmployee",defaultFetchGroup="true") private List<Leave> leaves;
@Persistent @Embedded private EmployeeManager employeeManager; } Leave Class: @PersistenceCapable(identityType = IdentityType.APPLICATION,detachable="true") public class Leave implements Serializable{ private static final long serialVersionUID = 1L; @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true") private String leaveid; @Persistent private String reason; @Persistent private String status; // @OneToMany(fetch=FetchType.EAGER) public Employee parentEmployee; } EmployeeManager: @PersistenceCapable @EmbeddedOnly public class EmployeeManager implements Serializable { private static final long serialVersionUID = 1L; @Persistent public String managerId; } when i covert the result into String and then send to client then it is accepting but when i am sending object it giving me error like: Type 'org.datanucleus.store.appengine.query.StreamingQueryResult' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = [parentemp.client.Employee@1988799, parentemp.client.Employee@ee738e, parentemp.client.Employee@e48ee2] What should i do...??? -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.