Spring Boot 初始化未完成 [应用卡住]

Question

启动 Spring 启动时，应用程序卡住并且 SpringApplication.run 没有返回。

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class AccountServiceApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(AccountServiceApplication.class, args);
        System.out.println("----------------------------- I'm done -------------------------");
    }
}

我可以看到 Spring 创建了所有的 bean，但它永远不会返回，虽然嵌入式 tomcat 是在 9000 上启动的，但它没有在听

class org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory's object [after] tomcatEmbeddedServletContainerFactory
[05/16/19 06:17:44:044 IST]  INFO tomcat.TomcatEmbeddedServletContainer: : Tomcat initialized with port(s): 9000 (http)
May 16, 2019 6:17:44 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-9000"]
May 16, 2019 6:17:44 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service [Tomcat]

Trying 127.0.0.1...
Connection failed: Connection refused
Trying ::1...
telnet: Unable to connect to remote host: Connection refused

应用程序在创建 JMS 连接后永远卡住。

class org.springframework.expression.spel.support.StandardEvaluationContext's object [after] integrationEvaluationContext
class org.springframework.integration.handler.LoggingHandler's object [after] _org.springframework.integration.errorLogger.handler
class org.springframework.integration.config.ConsumerEndpointFactoryBean's object [before]_org.springframework.integration.errorLogger
class org.springframework.integration.config.ConsumerEndpointFactoryBean's object [after] _org.springframework.integration.errorLogger
class org.springframework.integration.config.IdGeneratorConfigurer's object [before]org.springframework.integration.config.IdGeneratorConfigurer#0
class org.springframework.integration.config.IdGeneratorConfigurer's object [after] org.springframework.integration.config.IdGeneratorConfigurer#0
[05/16/19 05:58:02:002 IST]  INFO annotation.AnnotationMBeanExporter: : Registering beans for JMX exposure on startup
class org.springframework.expression.spel.support.StandardEvaluationContext's object [after] integrationEvaluationContext
[05/16/19 05:58:02:002 IST]  INFO support.DefaultLifecycleProcessor: : Starting beans in phase 0
[05/16/19 05:58:02:002 IST]  INFO endpoint.EventDrivenConsumer: : Adding {logging-channel-adapter:_org.springframework.integration.errorLogger} as a subscriber to the 'errorChannel' channel
[05/16/19 05:58:02:002 IST]  INFO channel.PublishSubscribeChannel: : Channel 'application:9000.errorChannel' has 1 subscriber(s).
[05/16/19 05:58:02:002 IST]  INFO endpoint.EventDrivenConsumer: : started _org.springframework.integration.errorLogger
[05/16/19 05:58:02:002 IST]  INFO support.DefaultLifecycleProcessor: : Starting beans in phase 2147483647
[05/16/19 05:58:02:002 IST]  INFO connection.CachingConnectionFactory: : Established shared JMS Connection: ActiveMQConnection {id=ID:SDSD121SFSSDF.local-54305-1557966482134-1:1,clientId=null,started=false}

关于如何调试它的任何指针？

Answer 1

在您的应用程序中，可能存在一个无限循环的线程。 您的应用程序启动失败。 并且这个线程没有退出。 进程仍然存在。看起来启动成功了。

Answer 2

在这种情况下可能有帮助的常见做法是“在沙漠中捕捉狮子/二进制搜索”以找出问题的原因。

尝试注释掉您的应用程序的一半，直到您到达应用程序启动没有问题的程度。 然后您将能够确定有问题的代码/部分。

Answer 3

我也被困在：

INFO support.DefaultLifecycleProcessor: : Starting beans in phase X

这是因为在 @RestController 类中，我让 @GetMapping 方法返回了一个 @Entity，而它应该是一个 DTO。