Spring，org.springframework.boot.autoconfigure的Gradle編譯錯誤

Question

我想使用Spring Framework編寫自己的IM。 我讀了這篇：

入門-使用RabbitMQ進行消息傳遞

當我在下面編譯此代碼時，我收到此錯誤消息： http : //pastebin.com/7gNJBAE2

如果有任何幫助或建議，我將不勝感激。

我正在使用：Windows 8.1，Java 8，NetBeans 8.0.2。，Gradle 2.5

Receiver.java

package hello;

    import java.util.concurrent.CountDownLatch;

    public class Receiver {

        private CountDownLatch latch = new CountDownLatch(1);

        public void receiveMessage(String message) {
            System.out.println("Received <" + message + ">");
            latch.countDown();
        }

        public CountDownLatch getLatch() {
            return latch;
        }

    }

Application.java

package hello;

import java.util.concurrent.TimeUnit;

import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class Application implements CommandLineRunner {

    final static String queueName = "spring-boot";

    @Autowired
    AnnotationConfigApplicationContext context;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Bean
    Queue queue() {
        return new Queue(queueName, false);
    }

    @Bean
    TopicExchange exchange() {
        return new TopicExchange("spring-boot-exchange");
    }

    @Bean
    Binding binding(Queue queue, TopicExchange exchange) {
        return BindingBuilder.bind(queue).to(exchange).with(queueName);
    }

    @Bean
    SimpleMessageListenerContainer container(ConnectionFactory connectionFactory, MessageListenerAdapter listenerAdapter) {
        SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        container.setQueueNames(queueName);
        container.setMessageListener(listenerAdapter);
        return container;
    }

    @Bean
    Receiver receiver() {
        return new Receiver();
    }

    @Bean
    MessageListenerAdapter listenerAdapter(Receiver receiver) {
        return new MessageListenerAdapter(receiver, "receiveMessage");
    }

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

    @Override
    public void run(String... args) throws Exception {
        System.out.println("Waiting five seconds...");
        Thread.sleep(5000);
        System.out.println("Sending message...");
        rabbitTemplate.convertAndSend(queueName, "Hello from RabbitMQ!");
        receiver().getLatch().await(10000, TimeUnit.MILLISECONDS);
        context.close();
    }
}

Answer 1

java.lang.IllegalStateException：由於找不到內部類，因此無法評估org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration＃transactionManager上的條件。 如果您使用@ComponentScanning springframework軟件包，則可能會發生這種情況（例如，如果您錯誤地將@ComponentScan放入默認軟件包中）

看來您的源文件在src/main/java而不是在src/main/java/demo

您沒有添加package hello;嗎package hello; 手動？ 我將代碼粘貼復制到從start.spring.io創建的新項目中，並且無需任何操作即可工作。