Spring Boot Autowired null

Question

I have several classes in a Spring Boot project, some work with @Autowired, some do not. Here my code follows:

Application.java (@Autowired works):

package com.example.myproject;

@ComponentScan(basePackages = {"com.example.myproject"})
@Configuration
@EnableAutoConfiguration
@EnableJpaRepositories(basePackages = "com.example.myproject.repository")
@PropertySource({"classpath:db.properties", "classpath:soap.properties"})
public class Application {

@Autowired
private Environment environment;

public static void main(String[] args) {
    SpringApplication.run(Application.class);
}

@Bean
public SOAPConfiguration soapConfiguration() {
    SOAPConfiguration SOAPConfiguration = new SOAPConfiguration();
    SOAPConfiguration.setUsername(environment.getProperty("SOAP.username"));
    SOAPConfiguration.setPassword(environment.getProperty("SOAP.password"));
    SOAPConfiguration.setUrl(environment.getProperty("SOAP.root"));
    return SOAPConfiguration;
}

HomeController (@Autowired works):

package com.example.myproject.controller;

@Controller
class HomeController {

    @Resource
    MyRepository myRepository;

MyService (@Autowired does not work):

package com.example.myproject.service;

@Service
public class MyServiceImpl implements MyService {

    @Autowired
    public SOAPConfiguration soapConfiguration; // is null

    private void init() {
    log = LogFactory.getLog(MyServiceImpl.class);
    log.info("starting init, soapConfiguration: " + soapConfiguration);
    url = soapConfiguration.getUrl(); // booom -> NullPointerException

I do not get the SOAPConfiguration but my application breaks with a null pointer exception when I try to access it.

I have already read many Threads here and googled around, but did not find a solution yet. I tried to deliver all necessary information, please let me know if anything misses.

Answer 1

I guess you call init() before the autowiring takes place. Annotate init() with @PostConstruct to make it call automatically after all the spring autowiring.

EDIT: after seeing your comment, I guess you are creating it using new MyServiceImpl(). This takes away the control of the MyServiceImpl from Spring and gives it to you. Autowiring won't work in those case

Answer 2

Did you created a bean for the class SOAPConfiguration in any of your configuration classes? If you want to autowire a class in your project, you need to create a bean for it. For example,

@Configuration
public class SomeConfiguration{

    @Bean
    public SOAPConfiguration createSOAPConfiguration(){

        return new SOAPConfiguration();
    }

}

public class SomeOtherClass{

    @Autowired
    private SOAPConfiguration soapConfiguration;
}