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public interface Processor {
    void process();
}

public class FirstProcessor implements Processor{

    @Override
    public void process() {
        System.out.println("this is " + this.getClass().getSimpleName());
    }
}

public class SecondProcessor implements Processor{

    @Override
    public void process() {
        System.out.println("this is " + this.getClass().getSimpleName());
    }
}

@RestController
public class OrderController {

    @Autowired
    private List<Processor> processors;

    @RequestMapping(value = "/order", method = RequestMethod.GET)
    @ResponseBody
    public void test() {
        for (Processor processor : processors) {
            processor.process();
        }
    }
}

@Service
public class ThirdProcessor implements Processor{

    @Override
    public void process() {
        System.out.println("this is " + this.getClass().getSimpleName());
    }
}

@Service
public class FourthProcessor implements Processor{
    @Override
    public void process() {
        System.out.println("this is " + this.getClass().getSimpleName());
    }
}

package org.springframework.core.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE, ElementType.METHOD, ElementType.FIELD})
@Documented
public @interface Order {
    int value() default Integer.MAX_VALUE;
}

@Service
@Order(value = 1)
public class FirstProcessor implements Processor{
@Service
@Order(value = 2)
public class SecondProcessor implements Processor{
@Service
@Order(value = 3)
public class ThirdProcessor implements Processor{
@Service
@Order(value = 4)
public class FourthProcessor implements Processor{

public interface Ordered {
    int HIGHEST_PRECEDENCE = Integer.MIN_VALUE;
    int LOWEST_PRECEDENCE = Integer.MAX_VALUE;

    int getOrder();
}

public class FirstProcessor implements Processor, Ordered {

    @Override
    public void process() {
        System.out.println("this is " + this.getClass().getSimpleName());
    }

    @Override
    public int getOrder() {
        return 1;
    }
}

public class Demo {

    private int order = 0;

    public int getOrder() {
        return order;
    }

    public void setOrder(int order) {
        this.order = order;
    }
}

This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
For example, it is not generally permissible for one thread to modify a Collection while another thread is iterating over it. In general, the results of the iteration are undefined under these circumstances. Some Iterator implementations (including those of all the general purpose collection implementations provided by the JRE) may choose to throw this exception if this behavior is detected. Iterators that do this are known as fail-fast iterators, as they fail quickly and cleanly, rather that risking arbitrary, non-deterministic behavior at an undetermined time in the future.

public void sort(Comparator<? super E> c) {
        final int expectedModCount = modCount;
        Arrays.sort((E[]) elementData, 0, size, c);
        if (modCount != expectedModCount)
            throw new ConcurrentModificationException();
        modCount++;
    }