Spring @PostConstruct dependency
Let's say I have this dependency in Spring @Configuration
:
@Bean
public SomeClass someClass(SomeClass1 someClass1, SomeClass2 someClass2, ...) {
return new SomeClass(someClass1, someClass2, ...);
}
Let's say I want to do something in @PostConstruct
that includes a dependency someClass
:
@PostConstruct
public void init() {
someClass.doSomething();
}
This cannot be entered:
@PostConstruct
public void init(SomeClass someClass) {
someClass.doSomething();
}
the reasons:
Caused by: java.lang.IllegalStateException: Lifecycle method annotation requires a no-arg method: ...
It cannot be auto-updated in the same configuration like this:
@Autowire
private SomeClass someClass;
@Bean
public SomeClass someClass(SomeClass1 someClass1, SomeClass2 someClass2, ...) {
return new SomeClass(someClass1, someClass2, ...);
}
as this results in:
Caused by: org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'globalBus': Requested bean is currently in creation: Is there an unresolvable circular reference?
The config can be split (so @Bean
goes to a different config) and @Import
-ed by that, and it works fine. There are probably other solutes. creating a separate initialization bean or so.
Is there a way to do this within one @Configuration
?
Edit
As requested by @SotiriosDelimanolis, sscce for an exception when used @Autowired
:
public class ConfigPostConstructDependenciesPrb {
public static void main(String[] args) {
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Config.class);
ctx.getBean(Service.class);
ctx.close();
}
public static class Service {
private final Dependency dependency;
public Service(Dependency dependency) {
this.dependency = dependency;
}
public void work() {
System.out.println(dependency.getNum());
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Service [dependency=");
sb.append(dependency);
sb.append("]");
return sb.toString();
}
}
public static class Dependency {
private final int num;
public Dependency(int num) {
this.num = num;
}
public int getNum() {
return this.num;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("SomeClass1 [num=");
sb.append(num);
sb.append("]");
return sb.toString();
}
}
@Configuration
public static class BaseConfig {
@Autowired
private Service service;
@Bean
public Dependency dependency() {
return new Dependency(42);
}
@Bean
public Service service(Dependency dependency) {
return new Service(dependency);
}
@PostConstruct
public void init() {
service.work();
}
}
@Configuration
@Import(BaseConfig.class)
public static class Config {
@Autowired
private Service service;
}
}
source to share
Try this way:
public class ConfigPostConstructDependenciesPrb {
public static void main(String[] args) {
try {
AnnotationConfigApplicationContext ctx =
new AnnotationConfigApplicationContext(BaseConfig.class);
ctx.registerShutdownHook();
ctx.getBean(Service.class);
ctx.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
@Configuration
class BaseConfig {
@Autowired
private Service service;
@Bean
public Dependency dependency() {
return new Dependency(42);
}
@Bean
public Service service(Dependency dependency) {
return new Service(dependency);
}
@PostConstruct
public void init() {
this.service.work();
}
}
class Dependency {
private int num;
public Dependency() {
}
public Dependency(int num) {
this.num = num;
}
public int getNum() {
return this.num;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("SomeClass1 [num=");
sb.append(num);
sb.append("]");
return sb.toString();
}
}
class Service {
private Dependency dependency;
public Service() {
}
public Service(Dependency dependency) {
this.dependency = dependency;
}
public void work() {
System.out.println(dependency.getNum());
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Service [dependency=");
sb.append(dependency);
sb.append("]");
return sb.toString();
}
}
source to share