Non-sequential IDs assigned using sequence="ID" on PrimaryKey

Hello,
I've seen some people asking something similar but I can't get this thing to work and it's driving me crazy. I'm using je-3.2.23 BTW.
I have this simple class:
* SYSADM.java
* Created on 26 de junio de 2007, 09:29 AM
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package haven;
import com.sleepycat.persist.model.Entity;
import com.sleepycat.persist.model.PrimaryKey;
* @author Mario
@Entity
public class SYSADM extends Usuario{
private boolean root;
@PrimaryKey(sequence="ID")
private long id;
/** Creates a new instance of SYSADM */
public SYSADM() {
/** Creates a new instance of SYSADM from parameters */
public SYSADM(boolean root,long id, String loginName, String password, String nombre, String apellido, String email) {
super(loginName, password, nombre, apellido, email);
setRoot(root);
//setId(id);
/** Creates a new instance of SYSADM from a VOSYADM */
public SYSADM(VOSYSADM voSYSADM) {
super(voSYSADM.getLoginName(),voSYSADM.getPassword(),
voSYSADM.getNombre(),voSYSADM.getApellido(),voSYSADM.getEmail());
setRoot(voSYSADM.isRoot());
//setId(voSYSADM.getId());
public VOSYSADM getVOSYSADM() {
return new VOSYSADM(this.isRoot(),this.getId(),this.getLoginName(),this.getPassword(),
this.getNombre(),this.getApellido(),this.getEmail());
public boolean isRoot() {
return root;
public void setRoot(boolean root) {
this.root = root;
public long getId() {
return id;
public void setId(long id) {
this.id = id;
and when I add records to the database using DPL I get ids like 1,101,201... and so on.
I've looked at all the examples and tested them myself and I get the same behavior from all the classes I test.
Plus all the tutorials and materials say that this is plain simple... let me quote from PrimaryIndex:
" Employee employee;
employee = new Employee("Jane Smith");
primaryIndex.putNoReturn(employee); // Inserts an entity
assert employee.id == 1;
employee = new Employee("Joan Smith");
primaryIndex.putNoReturn(employee); // Inserts an entity
assert employee.id == 2; "
I don't get... may be I'm plain dumb... should've ask that first to myself... I'm getting desperate here people... really!
Anyway... any help is much appreciated.
Regards to all,
Mario

First of all many thanks for your feedback... it's
really encouraging in times of desperation to find
somebody out willing and actually helping you! You're welcome!
This is good. I'm aware of how RDBMS are integrated
in the AS. Basically you need the driver and the
connection to the database. For DBD JE I have made a
simple test and I can persist objects from a web
application in the AS. I simply open the environment
that points to a directory in the file system. I
suppose that as long as that directory is accessible
through the network it should be fine. Is this
correct?That''s correct. However, I strongly recommend that the Environment directory be on a local disk. There are problems with using NFS, see:
http://www.oracle.com/technology/products/berkeley-db/faq/je_faq.html#1
The question of scalability arises. As far as I read
DBD C is the number one embeddable OpenSource
Database out there. So I assume the same would apply
for BDB JE some day (more even once it gets HA). How
scalable is BDB JE? The limitation seems to be the
available space in the machine where the filesystem
is located? Does the filesystem have to the same
where the AS is installed?It sounds like you're asking about data size scalability, not processor scalability. Yes, the limitation is the amount of file storage available, via a single directory, from the process that embeds JE. JE uses the standard java.io package for creating and accessing log files, so any hardware and file system that works under that API will work, as long as file locking is supported as mentioned in the FAQ above. JE creates numbered log files in sequence from 00000000.jdb to FFFFFFFF.jdb, and you can configure the size of the files. The default size is 10 MB.
Ok I 'll look into it. Specialy into what a "Service"
is. Off the top of my head I guess that by service
you are referring to a stateless ejb implementing the
Singleton pattern so you have only one instance
running at all times, that embeds all database
interactions, opens the environment at creation time,
give data-accessors and thus handles all access to
the database. Exactly.
Should I open all indexes in the
Singleton at creation time as well and simply get
data-accessors to to perform read/write operations?Yes, that's what I recommend. See:
http://www.oracle.com/technology/products/berkeley-db/faq/je_faq.html#12
Ok we willhave to wait then. One of the questions I
received about BDB JE is why a JE when you have the C
version with a Java API? I guess it's related to
being written in Java (portability-wise), it runs in
the same JVM and it's 100% Java codeYes, this is the primary reason. A pure Java library is easier to deploy, test and debug than a C-based library, especially if you target multiple platforms. And the product can be optimized for the Java platform.
and that it
incorporates the DPL much in the way JPA works to
have a closer integration. Am I correct?The DPL is only available for the JE product today, but it may be available for the C product in the future, since it is implemented on top of the base Java API that is common to both products.
Also, while the JE product has similar functionality to the C product, it uses a different internal architecture. JE uses a log structured storage system rather than a traditional page-based storage system; this is better for writing (disk head moves less) but worse for fetching records that are not in cache (disk head moves more). JE also uses record locking rather than page locking; this improves concurrent access but uses more memory for locks.
See "Berkeley DB Java Edition Architecture" here:
http://www.oracle.com/technology/products/berkeley-db/je/index.html
Last but not least. Portability-wise we are using DAO
to persist and in the DAOs we perisist the objects.
My logic is that by decorating POJOs with BDB JE
annotations i can use DAO to persist in DB JE, any
other persistency type including text, dbf, RDBMs
using an ORM (without JPA), or creating a separate
set of classes decorated with JPA annotations (though
I would stick with ANSI SQL if I could). Do you see
this as correct? Would you reccomend using DAO at all
with Berkeley?Yes, a DAO is a good idea when you need to target multiple storage mechanisms. And the DPL does not meet this need, because it can only be used for Berkeley DB JE.
If you need an API that works very well for Berkeley DB (JE and C products), plus relational DBs, then I strongly recommend Carbonado, an open-source framework from Amazon:
http://carbonado.sourceforge.net/
Mark

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