Composite key field is not a simple type or enum

Question

According to the docs here - http://www.oracle.com/technology/documentation/berkeley-db/je/java/index.html?com/sleepycat/persist/model/PrimaryKey.html - you can use "A composite key class containing one or more simple type or enum fields" as a key field. When we try that we get "java.lang.IllegalArgumentException: Composite key field is not a simple type or enum: Result$Key.recordId". Am I misreading the docs?
Thanks,
Trevor
@Persistent
public final class RecordKey {
@KeyField(1)
private final String name;
@KeyField(2)
private final int duplicateNumber;
RecordKey(final String name, final int duplicateNumber) {
this.name = name;
this.duplicateNumber = duplicateNumber;
RecordKey() {
this.name = null;
this.duplicateNumber = -1;
@Persistent
static final class Key {
@KeyField(1)
private final RecordKey recordId;
@KeyField(2)
private final String key;
Key(final RecordKey recordId, final String key) {
this.recordId = recordId;
this.key = key;
Key() {
this.recordId = null;
this.key = null;
}

Answer 1

Hi Trevor,
You're nesting one key class inside another. All fields of a key class must be simple types or enums, which is what the exception message is trying to say. If you want all those fields in your key class, you'll have to include them in a single flattened class.
Neither nesting of key classes nor inheritance of key classes is supported. We have enhancements filed to support these in the future, but no concrete plans.
--mark