HowTo Build an OSGI EJB3 Server

Ekkehard Gentz, Independent Software Architect

OSGI Experts Day 2009-05-24

ekke Ekkehard Gentz, Rosenheim

Freelancer, Software Architect, ERP Consultant

Business Developer (ERP Solutions)Assembler, Cobol, Pascal,4GL, Java

Domains: Apple Dealer, Paper Manufacturer, Waste & Recycling, ...

Who am I

So many articles and guidelines about OSGI: how to do it the right way

Is this reality for OSGI Enterprise Apps ?you have to...

... live with existing code

... use 3rd party bundles

... integrate different OSGI products, frameworks etc

Why this session

Project built from scratch

Business Processes and Rules change 'daily'

Short time-frame

Small Project Ressources

Possible to make it run ?

Business Project Overview

Easy to use for business users

Server 24*7 online

Rich Clients with great UI comfort

Processes and Rules change heavy and often

Has to run on different OS (XP, Vista, OSX)

Business Project Requirements

Frameworks

Technology

Project Decisions

UML (MagicDraw) MD DSL Customization Engine

MD Customized Domain-Specific Editors

MD Reader available

Eclipse - Integration

Why not EMF - only ?

Combine UML and EMF oAW as Generatorframework

Design and Modeling Tools

Eclipse RCP Platform

plus Riena UI Ridgets

Markers

Validators

plus Riena Navigation

plus redView dynamic Views for Business Apps

CDO distributed view models

Eclipse RCP (SWT) as Rich Client

OSGI modular, dynamic updates

flexible server architecture

Why Equinox as OSGI Framework ? its Eclipse ;-)

Riena uses Buddy Policy

so I‘m bound to Equinox

OSGI (Equinox) as Server

Easybeans choosen pure OSGI bundle implementation

vs WSAD, Glassfish or other OSGI-based JEE Server:

integrate Easybeans into your OSGI Enterprise app

all is under your control, no deploy to Appserver

Hibernate as JPA provider my knowledge of Hibernate

already bundled with EasyBeans OSGI

Services and Persistence: EJB3, JPA

First decision: jBPM + Drools jBPM as BusinessProcess Engine

Drools as Rules Engine + Decision Nodes in jBPM

Drools 5 supports both: Business Process Flow

Business Rules

Drools Business Rules and Process Flow

Relational data and xml data can be mixed

low costs for small companies

scales well if company grows

I know it

RDBMS: IBM DB2 Express

Perfect Integration into Eclipse world

Reports direct from DB2 RDBMS

Reports directly using Hibernate Pojos

BIRT as Reporting Engine

EJB3 Standard

Out of the box directly from EJB3 Container services

persistence

transactions

OSGI goes Enterprise

Easybeans OSGI JPA Container

Why OSGI and EJB3

Pros: all stored in EMF Models, EMF Databinding

no lazy exceptions from hibernate at client side

scales very well, persistence (Teneo, Hibernate)

Cons: model evolution not supported, no data-migration

no reporting tools like BIRT to use CDO repositories

future: could be an alternate way

Why not CDO to persist Business Models

Bundles entity

ejb, interfaces

enumerations

Fragments icons, fonts, OS-dependent-styles

Logging Utils, Logging Configuration

OSGI Server

Bundles entity

interfaces

enumerations

OSGI Server (Bundles)

@Stateless@PersistenceContext

@Local, @Remote

@Stateless, @Stateful

Entity Bundles

EJB Bundles

PersistenceContext Bundles

Business - Interface Bundles

implementsimplements

injects

Enumeration Bundles

@Entity, @Embeddable

Bundles unlimited

per Subapplication

per Subdomain

Productfamilies

used at Client and Server

Server-only Dependencies should be optional

Entity Bundles

@Entity, @Embeddable

Bundles per Subapplication

per Subdomain

per Customer / Product

Why separate Bundles ?Enumeration Literals different per Customers

Easy to change / enhance

Also used by Business Processes, Rules

Enumeration Bundles

BundlesStateless Beans

implements BusinessInterfaces

contains PersistenceContext (EntityManager)

only used at Server

JIRA EZB-294 all EJB‘s of PersistenceContext = 1 Bundle

All @Entity and @Embeddable must be listed inside persistence.xml because of a Bug

@Stateless

@PersistenceContext

Persistence Context Configuration

MyBean.java (in a PersistenceContext Bundle)

META-INF/persistence.xml

config/easybeans.xml

BundlesStateless or Stateful

only used at Server

can inject other EJB‘s from PersistenceContext Bundles

Productfamilies

@EJB(mappedName) BusinessInterface

JIRA EZB-322 can‘t found Interfaces from other Bundles

EJB Bundles

@Stateless,

@Stateful@EJB

EJB Bundles

Bundles Local or Remote

unlimited Bundles

structured per Subdomain, Product, ...

used on Client and Server

Business Interface Bundles

@Local,

@RemoteBusiness - Interface Bundles

Fragments Icons

Fonttemplates

OS-dependent-styles

Logging - Utilities

OSGI Server (Fragments)

openArchitectureWare (oAW) perfect integrated into eclipse

working with UML and EMF models side-by-side

generating:Entity, EJB, Business Interfaces

BusinessProcess /-rules Integration

EMF View models from Entity

configuration files and more

Quicktime Demo

UML Entity Diagram (MagicDraw) … oAW

(openArchitectureWare) Templates …

redView (Riena - EMF - Dynamic Views)

Overview

Different Eclipse Installations for different Roles Architect and Modeler

Client-Server-Platform Developer

UI Designer (Development)

UI Design and Prototyping (Business User)

Eclipse Workspaces and Installations

Eclipse Modeling

EMFUML2openArchitectureWare- XPand- XTend- Workflow

Eclipse Installations Eclipse Workspaces

my oAW Cartridges

javaentityejbservicesprocesses

Eclipse Runtime

Target Platform

EquinoxRCPRienaEasyBeans

abcfoosample

generates

Project Workflows

Project codeProject "foo"

entityejb - beansejb - apiservicesprocessesrulesui

Project Bundles

Integrate 3rd Party

Bundle Start Order

Services, ServiceTracker or DS ?

Logging Frameworks and OSGI

Dependency Cycles

Classloader used by 3rdParty

How to configure Target Platform

Problems solved using oAW

Problems to solve

Are they all brave OSGI citizens ? 1 jar == 1 bundle

import package instead of required bundles ?

always Versioning Bundles and Dependencies ?

HowTo integrate 3rdParty Bundles (1)

Quicktime Demo

look inside an OSGI Monster Bundle

… or… „can you count the jars ?“ ;-)

Are there any Monsters ? look inside EasyBeans core bundle

Are there dependency - cycles ? SLF4J + Logback, Easybeans

HowTo integrate 3rdParty Bundles (2)

Goal: Try to avoid Start-Levels needed but 3rdParty:

Agents like EasyBeans Agent

Logging first if using Log Bridges from OSGI

start first to avoid black holes

Bundle Start Order (1)

To make a System run: try using Start-Levels

then Iterations:

Add OSGI Services

Add ServiceTracker to start Bundles

Add DeclarativeServices to reduce ServiceTracker Complexity

early it

erations

ServerAgent tracks Services from EasyBeans using a

ServiceTracker

registers @Remote Interfaces for Riena

registers a Service if all is done

ServerAgent tracks Services from EasyBeans using a

ServiceTracker

registers @Remote Interfaces for Riena

registers a Service if all is done

early it

erations

MyServer waits for the ServerAgent - Service

registers a Service if all is ready

registers this also as RienaRemote Service

now the Clients know that the Domain Server runs

MyServer waits for the ServerAgent - Service

registers a Service if all is ready

registers this also as RienaRemote Service

now the Clients know that the Domain Server runs

early it

erations

Using Declarative Services

replace Easybeans Agent by own Implementation using DS

Using Declarative Services

replace Easybeans Agent by own Implementation using DS

Riena Remote Services

EasyBeans Services

ServiceTracker

Declarative Services (DS)

ServiceTracker vs DS

Services, Services, Services...

Riena Remote Services (1)

Publishing Service

Injecting Service the Riena Way (fluent interfaces)

I prefer DeclarativeServices

EasyBeans registers Services for each Business Interface (@Local, @Remote)

thanks to the EZB Team:

changed to ManagedServices, so Properties can easy used in Filters of ServiceTrackers

or DeclarativeServices (DS)

EasyBeans Services (1)

EasyBeans registers: ManagedServiceFactory Services for each EasyBeans

components:Transactions, Mail, JDBCPool, JMS, etc

EZBContainer Services

EJB3Container ready

PersistenceContext: Hibernate Mapping, Binding

JDBCPoolComponent the DataSource is available

EasyBeans Services (2)

start EJB Bundles ?

Service Tracker (1)

ManagedServiceFactory registered

all EZB

Components

registered ?

JDBCPool

Component ?

register JNDI for

DataSource

all DataSources

registered ?

Start EJB Bundles

start EJB Bundles ?

Service Tracker (1)

all EZB

Components

registered ?

JDBCPool

Component ?

register JNDI for

DataSource

all DataSources

registered ?

Start EJB Bundles

early it

erations

EasyBeans Components ? carol, hsqldb,

jotm, quartz, event, jmx, jdbcpool, joram

Services named like

carol-component-factory

Service Tracker (2)

all EZB

Components

registered ?

EasyBeans Components ? carol, hsqldb,

jotm, quartz, event, jmx, jdbcpool, joram

Services named like

carol-component-factory

Service Tracker (2)

all EZB

Components

registered ?

early it

erations

DataSources registered ? easybeans.xml

Service Tracker (3)

JDBCPool

Component ?

register JNDI for

DataSource

all DataSources

registered ?

DataSources registered ? easybeans.xml

Service Tracker (3)

JDBCPool

Component ?

register JNDI for

DataSource

all DataSources

registered ?

early it

erations

Service Tracker (4)

start EJB Bundles:

EasyBeans creates EJB3-Container for each PersistenceContext Bundle

Service Tracker (5)

all EZB

Components

registered ?

JDBCPool

Component ?

register JNDI for

DataSource

all DataSources

registered ?

Start EJB Bundles

start EJB Bundles:

EasyBeans creates EJB3-Container for each PersistenceContext Bundle

Service Tracker (5)

all EZB

Components

registered ?

JDBCPool

Component ?

register JNDI for

DataSource

all DataSources

registered ?

Start EJB Bundles

early it

erations

Service Tracker (6)

EZB Container Service registered

Container for all

EJB Bundles ?

register

RienaEasyBeansServerService

ManagedService registered

Remote Business

- Interface ?

register as Riena Remote Endpoint

ManagedServicesregistered by EasyBeansfor Business - Interfacesimplemented by @Stateless or @Statefull Beansfrom EJB - Bundles

EZBContainerServicesregistered by EasyBeansfor each EJB - Bundle

EasyBeans registers:

ManagedService for @Local, @Remote

EZBContainer Service for each EJB3-Container

Service Tracker (7)

ServiceTracker now tracks ManagedServices

tests for some Properties from EasyBeans

registers Services as RienaRemoteService

Service Tracker (7)

ServiceTracker now tracks ManagedServices

tests for some Properties from EasyBeans

registers Services as RienaRemoteService

early it

erations

Service Tracker (8)

All logic around EasyBeans EJB3-Container at a central point

Sounds good ?

Difficult to maintain or to test

What to do ?

We can describe the same complex logic solved with ServiceTracker using

DeclarativeServices (DS) let the OSGI Framework do the work

easy to maintain

lazy loading of Bundles

Eclipse 3.4 Ganymede: edit XML files

Eclipse 3.5 Galileo: PDE Tooling-Support

Declarative Services (1)

We can describe the same complex logic solved with ServiceTracker using

DeclarativeServices (DS) let the OSGI Framework do the work

easy to maintain

lazy loading of Bundles

Eclipse 3.4 Ganymede: edit XML files

Eclipse 3.5 Galileo: PDE Tooling-Support

final so

lution

Example „EasyBeans Components started ?“

final so

lution

final so

lution

OSGI Runtime with DeclarativeServices Wondering why a DS not started ?

set debug-trace-log vm-parameters:

-Dequinox.ds.debug=true

Console Output:

some more Properties: equinox.ds.print=true prints tracelogs to console

equinox.ds.perf=true logs execution times in ms

equinox.scr.waitTimeOnBlock=10000 how many ms should DS ait until a service component is ready

Are DS replacement for ServiceTracker (ST) ? ST has access to all methods of a Service

DS only access to properties

Missing graph visualization for some Dependencies

Service Tracker vs Declarative Services

Over all my recommendation:

Use Declarative Services where possible

Equinox DS will do all the difficult work for you

Service Tracker vs Declarative Services

OSGI Logging

'classic' Logging

Compare LoggingFrameworks

HowTo integrate them all

Logging with OSGI and 3rdParty

LogService

Equinox Extended LogService graduated soon

OSGI Logging

CommonsLogging

JDK Logging (java.util)

Classic Logging

...Easybeans Commons-Logging

JDK Logging

Riena Extended LogService

Start Parameters, ExtensionPoint

Hibernate switched from CommonsLogging to SLF4J

Logging used by ...

Compare LogFrameworks

SLF4JoverOSGI Bridge SLF4J with logback implementation

catches JCL, JDK, SLF4J, OSGI Log, ext. Log

Marker and Bundles

Fragments

alternate Solution: PAX Logging Log4J

catches JCL, JDK, SLF4J, Avalon

HowTo integrate them all

Eclipse 3.4 PDE Export has Problems with Cycles

Equinox Runtime works well

Trick:

put a „Fake“ Bundle without Dependencies into Workspace

HowTo solve Dependency Cycles

Eclipse 3.5M6 PDE Tooling Support

dont forget to set Compiler Warnings:

HowTo solve Dependency Cycles

EasyBeans contains Hibernate Hibernate uses ContextClassLoader

Try to avoid Dynamic Import *

BuddyPolicy only if really needed

Classloader from 3rd party

Overview

TargetPlatformDefinition Files to be portable: variable - string substitution

PDE Tooling 3.5 easier

Duplicates, Deltas Bugzilla Reports discuss better PDE Tooling support

HowTo configure the TargetPlatform (1)

Locations

EZB, Hibernate Bug Annotations generate classnames into persistence.xml

Check JPA Persistence data length of indizes, tables, inheritance strategies

EZB problems JNDI naming generate mapped Names into Interfaces

Bridge between UML and EMF from UML to EMF - UI and back

oAW - your little Helper

generate classnames into persistence.xml

oAW - solves Bug detecting Entity

generate @EJB.mappedName

oAW - solves Bug injecting @EJB (1)

now its easy to use:@EJB (mappedName = MyInterface.EZB_MAPPED_NAME)

MyInterface mi = null;

Server

Equinox (OSGI Framework), Riena (OSGI RemoteServices)

EasyBeans (OSGI EJB3 Container, JPA, Hibernate)

Rich Client

Eclipse RCP, Riena (UI Ridgets and Navigation)

Riena (OSGI Remote Services, ObjectTransactions)

ModelDriven Project

Eclipse Modeling (EMF, UML, CDO)

openArchitectureWare (oAW): Workflow, XPand, Xtend

MagicDraw (UML, DSL, oAW Integration)

Summary

Quicktime Demo

start the server: equinox, riena,

easybeans EJB3 … write some data to db

… watch (SLF4J/logback) logfiles with

lilith …

Other ways to persist ?

More M2M Transformations

Give Value back to Open Source Community

Next Steps

EasyBeans and EclipseLink EasyBerans provides both: Hibernate + EclipseLink

CDO with Teneo Hibernate re-use of JPA Annotations for Teneo

EMF Databinding

CDO remoting instead of RienaRemoteOSGI

possible ????

Alternate Ways to Persist Data

whole Business Model as EMF extra M2M transformation from UML

redView Drag‘n‘Drop for Databinding

needed if CDO in the future becomes an alternative

Extra M2M transformation

Open Source OSGI - EJB3 - Riena Server core equinox-EasyBeans OSGI-EJB3 server

UML Profiles (Java, JPA, EJB3, Drools)

oAW Templates and Cartridges

MagicDraw DSL Customization + Editors

Riena for Remote OSGI Services

plus core ERP functionality (business modules)

first beta published in june 2009

open-erp-ware.org (1)

slf4joverOSGI LoggingBridge

could be used additional to SLF4J / LogBack Bridges

open-erp-ware.org (2)

Open Source Dynamic Views for Business ApplicationsEMF

Ridgets

Prototyping

WYSIWYG Editor for dynamic SWT Views

redView - Riena EMF Dynamic Views

Question & Answer

ekke@ekkes-corner.org Blog: http://ekkes-corner.org (en) Blog: http://ekkes-ecke.org (de) Video Podcasts: http://ekkes-corner-tv.org Twitter: @ekkescorner

http://open-erp-ware.org http://redview.org

Video Podcast

you like to watch and hear this screencast as a Video Podcast ?

visit: http://ekkes-corner-tv.org or search iTunes for „ekkes-corner“

HowTo Build an OSGI EJB3 Server

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