Tag : spring

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Spring @Value – Import a list from properties file

In this tutorial, we will show you how to import a “List” from a properties file, via Spring EL @Value Tested with : Spring 4.0.6 JDK 1.7 Spring @Value and List In Spring @Value, you can use the split() method to inject the ‘List” in one line. config.properties server.name=hydra,zeus server.id=100,102,103Continue Reading

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Spring @PropertySource example

In Spring, you can use @PropertySource annotation to externalize your configuration to a properties file. In this tutorial, we will show you how to use @PropertySource to read a properties file and display the values with @Value and Environment. P.S @PropertySource has been available since Spring 3.1 1. @PropertySource andContinue Reading

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Spring @Value default value

In this tutorial, we will show you how to set a default value for @Value 1. @Value Examples To set a default value in Spring expression, use Elvis operator : #{expression?:default value} Few examples : @Value("#{systemProperties[‘mongodb.port’] ?: 27017}") private String mongodbPort;   @Value("#{config[‘mongodb.url’] ?: ‘127.0.0.1’}") private String mongodbUrl;   @Value("#{aBean.ageContinue Reading

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Spring – ${} is not working in @Value

A simple Spring @PropertySource example to read a properties file. db.properties db.driver=oracle.jdbc.driver.OracleDriver AppConfig.java @Configuration @PropertySource("classpath:db.properties") public class AppConfig {   @Value("${db.driver}") private String driver; But the property placeholder ${} is unable to resolve in @Value, if print out the driver variable, it will display string ${db.driver} directly, instead of “oracle.jdbc.driver.OracleDriver”.Continue Reading

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Spring MVC Abstract Controller example

For self-reference, this article shows you how to create a Abstract class for Spring Controller, or a template method design pattern. 1. Abstract Controller In Abstract class, the @Controller annotation is optional, your implemented class will apply it. AbstractResultController.java package com.mkyong.web.controller;   import java.util.Map; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.PathVariable;Continue Reading

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Spring Profiles example

Spring @Profile allow developers to register beans by condition. For example, register beans based on what operating system (Windows, *nix) your application is running, or load a database properties file based on the application running in development, test, staging or production environment. In this tutorial, we will show you aContinue Reading

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Import Spring XML files into @Configuration

This is common to mix XML configuration into Spring @Configuration, because developers are used to the XML namespaces. In Spring, you can use @ImportResource to import Spring XML configuration files into @Configuration : AppConfig.java import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.ImportResource;   @Configuration @ImportResource("classpath:/config/spring.xml") public class AppConfig {   } Another example AppConfig.javaContinue Reading

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Spring Caching and Ehcache example

In this tutorial, we will show you how to enable data caching in a Spring application, and integrate with the popular Ehcache framework. Tools used Ehcache 2.9 Spring 4.1.4.RELEASE Logback 1.0.13 Maven 3 / Gradle 2 JDK 1.7 Eclipse 4.4 Note Spring supports caching since version 3.1 Spring cache hasContinue Reading

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How to autowire DataSource in JdbcDaoSupport

A Simple DAO class extends JdbcDaoSupport, but, unable to inject or @autowired a “dataSource”, the method setDataSource is final, can’t override. UserDetailsDaoImpl.java package com.mkyong.users.dao; import javax.sql.DataSource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.support.JdbcDaoSupport; import org.springframework.stereotype.Repository;   @Repository public class UserDetailsDaoImpl extends JdbcDaoSupport implements UserDetailsDao {   //Error, cannot override the final method fromContinue Reading

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TestNG + Spring Integration Example

In this tutorial, we will show you how to test Spring’s components with TestNG. Tools used : TestNG 6.8.7 Spring 3.2.2.RELEASE Maven 3 Eclipse IDE 1. Project Dependencies To integrate Spring with TestNG, you need spring-test.jar, add the following : pom.xml <properties> <spring.version>3.2.2.RELEASE</spring.version> <testng.version>6.8.7</testng.version> </properties>   <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId>Continue Reading

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Spring and Java Thread example

Here are 3 examples to show you how to do “threading” in Spring. See the code for self-explanatory. 1. Spring + Java Threads example Create a simple Java thread by extending Thread, and managed by Spring’s container via @Component. The bean scope must be “prototype“, so that each request willContinue Reading

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Spring @Autowired into JSF custom validator

Here’s the scenario, create a custom JSF validator, injects a bean via Spring’s @Autowired. UsernameValidator.java – Custom JSF validator package com.mkyong.user;   import javax.faces.application.FacesMessage; import javax.faces.component.UIComponent; import javax.faces.context.FacesContext; import javax.faces.validator.FacesValidator; import javax.faces.validator.Validator; import javax.faces.validator.ValidatorException; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Scope; import org.springframework.stereotype.Component; import com.mkyong.user.bo.UserService;   @Component @Scope("request") @FacesValidator("UsernameValidator") public class UsernameValidator implementsContinue Reading

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Spring 3 and JSR-330 @Inject and @Named example

Since Spring 3.0, Spring supports for the standard JSR 330: Dependency Injection for Java. In Spring 3 application, you can uses standard @Inject instead of Spring’s @Autowired to inject a bean. @Named instead of Spring’s @Component to declare a bean. Those JSR-330 standard annotations are scanned and retrieved the sameContinue Reading

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How to inject null value in Spring

In Spring, you can uses this special <null /> tag to pass a “null” value into constructor argument or property. 1. Constructor Argument The wrong way to inject a null into constructor argument, a really common mistake, and nice try :) <bean id="defaultMongoTypeMapper1" class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper"> <constructor-arg name="typeKey" value="null" /> </bean> CorrectContinue Reading

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IncompatibleClassChangeError : JobDetailBean has interface org.quartz.JobDetail as super class

Developing Quartz 2.1.5 + Spring 3.1.2.RELEASE, hits following error messages : Caused by: java.lang.IncompatibleClassChangeError: class org.springframework.scheduling.quartz.JobDetailBean has interface org.quartz.JobDetail as super class at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2901) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1170) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556) at org.springframework.util.ClassUtils.forName(ClassUtils.java:258) … 19 more Solution Quartz 2 APIs are changedContinue Reading

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