The injecton is null in JUnit5 Spring unittest

Question

I know there are many posts related to JUnit5 env setting, but I am not sure why I still get the null injection. My unittest is for bellow to be referred to.

import com.example.demo.service.processing.Task;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;                 // the right one is used.
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;

import static org.junit.jupiter.api.Assertions.*;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)  //in JUnit5, these 2 are required.
@SpringBootTest
public class ProcessorUT {
    // some works, settings,
    @Autowired
    private static TransactionServiceImpl service;
    @BeforeAll
    public static void initBeforeAll(){
        //here the service is null
    }
    @BeforeEach
    public void initBeforeEach() {
        //service is null
    }
    @Test
    public void test_initProcessor(){
        //service is null
    }
}

the maven dependency is from spring initializer,

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.7.4</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

I also tried dependency bellow, but everything is the same. I think I am in the JUnit5 env based on spring-boot-starter-test with JUnit 5 . So what may be the issue? Any info is appreciated.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <version>2.7.4</version>
    <scope>test</scope>
</dependency>