How to load two classes in spring in a specific order?

2 years ago
Noah Thompson
1 minute

In Spring, the loading order of classes can be specified either through configuration files or by using annotations.

  1. tag
  2. relies on
<bean id="classA" class="com.example.ClassA" depends-on="classB" />
<bean id="classB" class="com.example.ClassB" />

In the aforementioned code, classA depends on classB, so when the container starts up, classB will be loaded first before classA.

  1. @Requires
@Component
@DependsOn("classB")
public class ClassA {
    // ...
}

@Component
public class ClassB {
    // ...
}

In the code above, ClassA relies on ClassB, so when the container starts, it will first load ClassB and then ClassA.

It is important to ensure that the classes being depended upon are loaded into the container, whether using configuration files or annotations. Failure to do so will result in an exception. Additionally, caution must be taken when dealing with circular dependencies to avoid endless loops.

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