Question

我是Spring的新手，我有以下启动应用程序类。我正在尝试从Spring启动应用程序连接到AWS SQS。代码如下：

@SpringBootApplication
@EnableConfigurationProperties ({ApplicationProperties.class, AwsProperties.class})
public class Application{
    private static final Logger logger = LoggerFactory.getLogger(Application.class);    
    public static void main(String[] args) throws IOException {
        SpringApplication.run(Application.class, args);
    }
}

ApplicationProperties.java

@Configuration
@PropertySource("classpath:application.properties")
@ConfigurationProperties(prefix="midb")
public class ApplicationProperties {

    private String keyStore;
    private String keyStorePassword;

// getter and setters
}

AwsProperties.java

@Configuration
@PropertySource("classpath:application.properties")
@ConfigurationProperties(prefix="aws")
public class AwsProperties {

    private String sqsEndpoint;
    private String accessKey;
    private String secretKey;
// getters and setters
}


@Configuration
@EnableJms
@EnableConfigurationProperties(AwsProperties.class)
public class JmsConfig {

    private static final Logger logger = LoggerFactory.getLogger(JmsConfig.class);


    @Autowired
    private AwsProperties awsProperties;

    @Autowired
    private SQSListener sqsListener;
    @PostConstruct
    public void init() {
        //System.out.println("================== " + awsProperties.toString() + "==================");// End point:"+endpoint);
    }

    @Bean
    public AmazonSQSClient createSQSClient() {

        AmazonSQSClient amazonSQSClient = new AmazonSQSClient(new BasicAWSCredentials(awsProperties.getAccessKey(), awsProperties.getSecretKey()));
        amazonSQSClient.setEndpoint(awsProperties.getSqsEndpoint());
        amazonSQSClient.createQueue(awsProperties.getSqsQueueName());
        return amazonSQSClient;
    }

    @Bean
    public DefaultMessageListenerContainer jmsListenerContainer() {
        SQSConnectionFactory sqsConnectionFactory = SQSConnectionFactory.builder()
                .withAWSCredentialsProvider(new DefaultAWSCredentialsProviderChain())
                .withEndpoint(awsProperties.getSqsEndpoint()).withAWSCredentialsProvider(awsCredentialsProvider)
                .withNumberOfMessagesToPrefetch(10).build();
        DefaultMessageListenerContainer dmlc = new DefaultMessageListenerContainer();
        dmlc.setConnectionFactory(sqsConnectionFactory);
        dmlc.setDestinationName(awsProperties.getSqsQueueName());
        dmlc.setMessageListener(sqsListener);
        return dmlc;
    }

    @Bean
    public JmsTemplate createJMSTemplate() {
        SQSConnectionFactory sqsConnectionFactory = SQSConnectionFactory.builder()
                .withAWSCredentialsProvider(awsCredentialsProvider).withEndpoint(awsProperties.getSqsEndpoint())
                .withNumberOfMessagesToPrefetch(10).build();
        JmsTemplate jmsTemplate = new JmsTemplate(sqsConnectionFactory);
        jmsTemplate.setDefaultDestinationName(awsProperties.getSqsQueueName());
        jmsTemplate.setDeliveryPersistent(false);
        return jmsTemplate;
    }

    private final AWSCredentialsProvider awsCredentialsProvider = new AWSCredentialsProvider() {
        @Override
        public AWSCredentials getCredentials() {
            return new BasicAWSCredentials(awsProperties.getAccessKey(), awsProperties.getSecretKey());
        }

        @Override
        public void refresh() {
        }
    };
}

当Maven构建时，我收到以下错误：

引起：org.springframework.beans.factory.BeanCreationException：创建名称为＆＃39; createSQSClient＆＃39;的bean时出错在类路径中定义 resource [io / bigbear / midb / sqs / JmsConfig.class]：Bean实例化通过工厂方法失败;嵌套异常是 org.springframework.beans.BeanInstantiationException：失败实例化[com.amazonaws.services.sqs.AmazonSQSClient]：工厂方法＆＃39; createSQSClient＆＃39;抛出异常;嵌套异常是 java.lang.IllegalArgumentException：访问键不能为空。

Answer 1

我不确定，但似乎你的<input type="text" class="input"> <button class="btn">Click me</button> <ul class="cont"></ul> <script> function createHtml(str) { return `<li>${str}</li>`; } function insertHtml(document, contClassName, str) { document.querySelector(`.${contClassName}`).innerHTML += str; } function handler() { insertHtml(document, 'cont', createHtml(document.querySelector(`.input`).value)); } document.querySelector('.btn').addEventListener('click', handler); </script>会返回null。

Spring引导中的多个配置属性@Autowired其中一个属性为null

1 个答案: