dependency injection

Jersey and HK2 dependency injection (auto scanning)

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This article shows how to use HK2 dependency injection framework in Jersey and enable auto-scanning auto-discovery of the declared @Contract and @Service components. Table of contents 1. Jersey and HK2 dependency injection 2. @Contract, @Service, and @Inject 3. HK2 manual register @Contract and @Service 4. HK2 auto scanning @Contract and @Service 4.1 HK2 inhabitant files …

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

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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 same way as Spring annotations, the …

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Spring DI via constructor

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Uses Spring to dependency inject a bean via constructor. 1. IOutputGenerator An interface and implementation class of it. package com.mkyong.output; public interface IOutputGenerator { public void generateOutput(); } package com.mkyong.output.impl; import com.mkyong.output.IOutputGenerator; public class JsonOutputGenerator implements IOutputGenerator { public void generateOutput(){ System.out.println("This is Json Output Generator"); } } 2. Helper class A helper class, later …

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Spring DI via setter method

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A simple Spring example to show you how to dependency inject a bean via setter method, the most common used DI method. 1. IOutputGenerator An interface and implemntation class of it. package com.mkyong.output; public interface IOutputGenerator { public void generateOutput(); } package com.mkyong.output.impl; import com.mkyong.output.IOutputGenerator; public class CsvOutputGenerator implements IOutputGenerator { public void generateOutput() { …

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