Spring Batch

When we need to perform batch jobs, better to use Spring Batch.
This is matured framework with many options.

1. Easy to configure
2. Repeat options / Retry options
3. Scalability with parallel process
4. Support for multiline records
Many more

http://docs.spring.io/spring-batch/reference/html/index.html

#spring

Spring Web Services 2 Cookbook

Spring Web Services 2 Cookbook
Paperback: 322 pages
Publisher: Packt Publishing (May 13, 2012)
Language: English
ISBN-10: 1849515824
ISBN-13: 978-1849515825
Books is available at Amazon.com

Spring Web Services 2 Cookbook

This is very nice book on Spring Web Services.

#cookbook, #spring-web, #web-services

New Webapp – Spring, GWT EXT, Restlet, Hibernate,….etc

Problem Statement: How to build very nice rich website?

Option 1: Single tier architecture
Advantages: Saves Time, Easy to implement
Disadvantages: Difficult to break up later to support other user interfaces.

Option 2: Two tier architecture
Advantages: Both are in its own spheres. Easy to modify and re-write later if required.
Disadvantages: Takes more time to setup the environment and looks like more code.

Technologies:
UI: GWT
Services: Spring, RESTful Services, Hibernate

Notes:
RESTful – http://www.xfront.com/REST-Web-Services.html
Restlet with Spring – http://jgoday.wordpress.com/2009/04/10/restlet-with-spring/
RESTful from Wiki: http://en.wikipedia.org/wiki/Representational_State_Transfer
Archtypes:
Archetype – HibernateSpringGwt https://opensource.fastconnect.org/redmine/projects/show/spring-gwt-archetype
maven-gwtext-archetype http://code.google.com/p/maven-gwtext-archetype/

-o-

#gwt-ext, #hibernate, #restlet, #spring

Spring Bean – Order of injecting properties

Problem Statement: We need to start some task, after injecting all properties. How to resolve this?

Solution: Dont / Never depend on order of injecting values into bean. It is not controlled.

import org.springframework.beans.factory.InitializingBean;

public class BeanName implements InitializingBean
{

public void afterPropertiesSet() throws Exception
  {
    System.out.println( "It will be called after completion of properties setting.");
    //do whatever is required here.
  }

}

#afterpropertiesset, #injecting-properties-order, #spring-framework

Injecting boolean values into Spring bean

Problem Statement: How to inject boolean values into spring bean?

Wrong:

<property name="isFlagEnabled" value="true"/>

private boolean isFlagEnabled = false;

Correct:

<property name="isFlagEnabled">
	<value type="java.lang.Boolean">true</value>
</property>

private Boolean isFlagEnabled = false;

-o-

#inject-boolean-value, #spring-bean

Spring – Inject Properties file into Bean

Problem Statement: Spring – Inject Properties file into Bean

Spring Bean configuration file

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd">

<util:properties id="propertiesFileID1" location="classpath:complete_file_pathfilename.properties"/>

<bean name="BeadID" class = "com.abc.ClassNameABCD" >
	<property name="propFile1" ref="propertiesFileID1"/>
</bean>

</beans>

Source code

package com.abc;

import java.util.Properties;

public class ClassNameABCD
{

 private Properties propFile1;

 //Prepare getter and setters for propFile1;

}

Read this for more information
http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/apcs02.html#xsd-config-body-schemas-util-properties

#spring-inject-properties

Spring – Oracle Connection Pool Configuration

Problem Statement: Configure Oracle Connection Pool in Spring

This is basic data source (Only testing)

<bean id="datasource1"
 class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName">
         <value>oracle.jdbc.driver.OracleDriver</value>
    </property>
<property name="url">
         <value>ORACLE URL</value>
    </property>
<property name="username">
         <value>user id</value>
    </property>
<property name="password">
         <value>user password</value>
    </property>
</bean>

This is dbcp data source (Preferred for Testing.)

<bean id="datasource2"
 class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName">
         <value>org.apache.commons.dbcp.BasicDataSource</value>
    </property>
<property name="url">
         <value>ORACLE URL</value>
    </property>
<property name="username">
         <value>user id</value>
    </property>
<property name="password">
         <value>user password</value>
    </property>
<property name="initialSize" value="5"/>
<property name="maxActive" value="20"/>
</bean>

This is Oracle Connection Pool (Production Quality)

<bean id="connectionPool1" class="oracle.jdbc.pool.OracleDataSource" destroy-method="close">
<property name="connectionCachingEnabled" value="true" />
<property name="URL">
         <value>ORACLE URL</value>
    </property>
<property name="user">
         <value>user id</value>
    </property>
<property name="password">
         <value>user password</value>
    </property>
<property name="connectionCacheProperties">
      <value>
		MinLimit:1
		MaxLimit:5
		InitialLimit:1
		ConnectionWaitTimeout:120
		InactivityTimeout:180
		ValidateConnection:true
      </value>
   </property>
</bean>

Oracle Connection Pool is better than DBCP and C3P0

-o-

select * from v$version;

“BANNER”
“Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 – 64bit Production”
“PL/SQL Release 11.2.0.1.0 – Production”
“CORE 11.2.0.1.0 Production”
“TNS for Linux: Version 11.2.0.1.0 – Production”
“NLSRTL Version 11.2.0.1.0 – Production”

Go to Oracle and Choose correct Driver and Download it.
http://www.oracle.com/technetwork/database/enterprise-edition/jdbc-112010-090769.html

Option 1: Added to Maven Repo and pom.xml

Add jar to maven Repo
http://www.mkyong.com/maven/how-to-add-oracle-jdbc-driver-in-your-maven-local-repository/

Refer it in pom file.

<project ...>
 
	<dependencies>>
 
		<!-- ORACLE database driver -->
		<dependency>
			<groupId>com.oracle</groupId>
			<artifactId>ojdbc6</artifactId>
			<version>11.2.0.1.0</version>
		</dependency>
 
	</dependencies>
</project>

Option 2: Add the jar file to Lib folder.

#oracle-jdbc-pool-oracledatasource