Converting Jar into Exe

JSmooth is a Java Executable Wrapper. It creates native Windows launchers (standard .exe) for your java applications.

http://jsmooth.sourceforge.net/index.php

Filter and Ranking attributes in OSGi

In a dynamic system we can have multiple services of same bean type. In that case a consumer of a service can specify a filter to qualify the required bean as follows:

In one bundle publish the service as:

<bean id="helloService" class="com.ivy.example.service.factory.HelloServiceFactory" factory-method="getHelloService" />

<osgi:service ref="helloService" interface="com.ivy.example.service.HelloService">
<osgi:service-properties>
<entry key="product" value="account" />
</osgi:service-properties>
</osgi:service>


To consume the service in another bundle:

<osgi:reference id="helloService" filter="(product=account)" interface="com.ivy.example.service.HelloService" />

<bean id="testData" class="com.ivy.data.TestData" init-method="start" destroy-method="stop">
<property name="helloService" ref="helloService" /> <- dependency injection of the referenced bean
</bean>


Ranking attribute can be specified while advertising a bean:

the one with the higest rank if obtained i case of two similar services

<osgi:service ref="helloService" interface="com.ivy.example.service.HelloService" ranking=”1” >

The ranking attribute is useful for determining the 'best matching' OSGi service in case multiple candidates are available.
If one needs to pin point a service then a filter should be used.

Spring in a Nutshell

Features

The Inversion of Control (IoC) container - For Dependency Injection

Xml Configuration,Java Configeration and Property File Based Configeration

Instantiation using a static factory method,Instance factory method

Injecting dependencies - Constructor Injection,Setter Injection

Dependencies and configuration -Inner beans,Collections (list, set, map, and props elements allow properties)

Other features- depends-on,Lazy-init,Autowiring

Method Injection- for Injecting prototypes into singletons objects

Bean scopes- singleton,prototype,global,session,request,Custom scopes

Lifecycle callbacks- init,destroy

Shutting down the Spring IoC container gracefully in non-web applications

Bean definition inheritance

Container extension points- BeanPostProcessors,PropertyPlaceholderConfigurer etc

Annotation-based configuration- @Required, @Autowired, @Qualifier, @Component, @Service, @Repository

Using filters to customize scanning

Registering a LoadTimeWeaver

Aspect Oriented Programming with Spring

AOP- Aspect,Joint Point,Advice,PointCut,target,Weaving,AOP Proxy

Choosing which AOP declaration style - Spring AOP or full AspectJ

Spring AOP -- @AspectJ or XML for Spring AOP

Spring AOP APIs

Support for AspectJ load-time weaving

Transaction Managemnt

ORM Data Access - Hibernate,JDO,Oracle TopLink,IBatis,JPA etc

Spring MVC

View Technology - JSp & JSTL , Tile,Velocity,FreeMarker,XSTl , Jasper Reports

Spring Remoting

Intergration with Quartz for Scheduling

MethodInvokingFactoryBean - > to call methods of instantiated beans .

Example

<bean id="RequestObject" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">

<property name="targetObject" ref="createdBean"/>
<property name="targetMethod" value="methodToBecalled"/>
<property name="arguments">
<map>
<entry key="xxxxxx" value-ref="yyyyyyyy" />
</map>
</property>
</bean>

Log4j Slf4j issues in Spring Dm

If you try to use log4j in any application under Spring DM we may get some ClassNotFound exceptions . The issue could be the following

com.springsource.slf4j.org.apache.log4j-1.5.6.jar - is present in

springsource-dm-server-ee-1.0.2.RELEASE\repository\bundles\ext directory and it shares a package org.apache.log4j

Now when you put your log4j jar into repository\bundles\usr - it also shares the same package
org.apache.log4j .

Hence one in the repository is resolved first . So all requests to classes in the log4j jar within package org/apache/log4j will give ClassNotFound Exceptions as it looks for these classes in slf4j jar .

The easiest way i resolved this was by deleting com.springsource.slf4j.org.apache.log4j-1.5.6.ja from the repository . This change did not affect any logging of the spring Dm server.

Another way to solve this is

Import-Package: org.apache.log4j;bundle-symbolic-name="com.springsource.org.apache.log4j"

http://forum.springsource.org/showthread.php?t=73354

Updating bundle inside a PAR

Currently it is possible to update a bundle within a PAR only through spring tool suite.
This is done through the Deployer MBean - JMX.

This flexibility is not available running a standalone spring Dm server.

May be the future versions of the Spring DM server will support this.

http://forum.springsource.org/showthread.php?t=62293

Tomcat Version In Spring Dm OSGi

Spring DM Server comes with Tomcat 6.0.18, which I believe is the latest one.

You can see the latest version by looking at

DM_SERVER_HOME/repository/bundles/ext/ and

look at Catalina bundles (i.e., com.springsource.org.apache.catalina-6.0.18.jar)

Log4j/Struts Behaviour in OSGi

Log4j/Struts behaves weird if the these jar are put under repository, because this single static instance inside these jars are shared by all other bundles.

Example: Struts(struts properties),log4j(log4/properties)

All the properties are written into static members.Since the single instance is shared by both the bundles applications, the value of static references will be overridden and both the application will use the same settings.

This case is not specific to spring Dm , it will also occur when common configuration object
is put under common lib in tomcat.

Example: log4j/struts jar in tomcat common lib