SpringClod所遇异常总结

SpringClod所遇异常总结

微服务启动Connection refused: connect

启动微服务时，出现了Connection refused: connect

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java.net.ConnectException: Connection refused: connect
	at java.base/java.net.PlainSocketImpl.connect0(Native Method) ~[na:na]
	at java.base/java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:101) ~[na:na]
	at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399) ~[na:na]
	at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242) ~[na:na]
	at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224) ~[na:na]
	at java.base/java.net.Socket.connect(Socket.java:591) ~[na:na]
	at java.base/java.net.Socket.connect(Socket.java:540) ~[na:na]
	at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:182) ~[na:na]
	at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:474) ~[na:na]
	at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:569) ~[na:na]
	at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:242) ~[na:na]
	at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:341) ~[na:na]
	at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:362) ~[na:na]
	at

原因

1.还没有配置eureka的时候引入了依赖忘了删除，导致eureka拦截。

2.80端口被占用

3.8001provider未启动

解决方法

删除eureka依赖，使用netstat -ano |more 查看80端口占用情况，使用任务管理器结束该进程，重启8001provider服务。

Flipping property: CLOUD-PROVIDER-HYSTRIX-PAYMENT.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647

在测试完服务端20000并发量访问后，添加消费端，超市设置等待3秒，Hystrix报错超时。

Flipping property: CLOUD-PROVIDER-HYSTRIX-PAYMENT.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647

image-20210112115344122

原因

Feign里面自带Ribbon，Ribbon默认超时时间为1s，这里手动等待3秒而出现超时。

解决方法

配置Ribbon超时时间

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ribbon:  
    httpclient:      
        enabled: true  
    MaxConnectionsPerHost: 500  
    MaxTotalConnections: 2000  
    ConnectTimeout: 60000  
    ReadTimeout: 60000

Nacos集群模式启动报错

版本：nacos：1.4.1 mysql：8.0.21

在单机模式切换集群模式，配置数据库等信息后，启动报错

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org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:156)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204)
        at com.alibaba.nacos.Nacos.main(Nacos.java:35)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:107)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
        at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:467)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:124)
        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:416)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:180)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153)
        ... 16 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'distroFilterRegistration' defined in class path resource [com/alibaba/nacos/naming/web/NamingConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.FilterRegistrationBean]: Factory method 'distroFilterRegistration' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'distroFilter': Unsatisfied dependency expressed through field 'distroMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'distroMapper' defined in URL [jar:file:/D:/Enviroment/nacos/target/nacos-server.jar!/BOOT-INF/lib/nacos-naming-1.4.1.jar!/com/alibaba/nacos/naming/core/DistroMapper.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'serverMemberManager' defined in URL [jar:file:/D:/Enviroment/nacos/target/nacos-server.jar!/BOOT-INF/lib/nacos-core-1.4.1.jar!/com/alibaba/nacos/core/cluster/ServerMemberManager.class]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.alibaba.nacos.core.cluster.ServerMemberManager]: Constructor threw exception; nested exception is ErrCode:500, ErrMsg:jmenv.tbsite.net

查询可能是因为nacos默认不支持mysql8.0，于是寻找网上方法下载mysql-connector-java-8.0.21.jar说放在plugins目录。但是1.4版本我咋也找不到plugins，后来打开target

Sentinel配置统一降级方法时出现Wrong state for SentinelResource annotation

由于使用@SentinelResource去在每个方法上配置太麻烦，并且增加代码冗余度，于是使用统一的处理方法对url进行限流。

首先写异常处理器。

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public class CustomUrlBlockHandler implements UrlBlockHandler {
    @Override
    public void blocked(HttpServletRequest request, HttpServletResponse response, BlockException e) throws IOException {
        CommonResult result = null;
        // 被限流
        if (e instanceof FlowException){
            result=new CommonResult().setCode(429).setCurrentPage(1)
                    .setMessage("系统繁忙，请稍后再试--限流")
                    .setTotal(1);
        }
        // 降级异常
        else if (e instanceof DegradeException){
            result=new CommonResult().setCode(430).setCurrentPage(1)
                    .setMessage("系统异常，请稍后再试--降级")
                    .setTotal(1);
        }
        else if (e instanceof ParamFlowException){
            result=new CommonResult().setCode(431).setCurrentPage(1)
                    .setMessage("该资源访问繁忙，请稍后再试--热点")
                    .setTotal(1);
        }
        response.setStatus(500);
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-Type","application/json;charset=utf-8");
        response.setContentType("application/json;charset=utf-8");
        new ObjectMapper().writeValue(response.getWriter(),result);
    }
}

然后将拦截器注册。

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@PostConstruct	// 会在servlet服务器加载Servlet的时候运行，并且只会被服务器执行一次。PostConstruct在构造函数之后执行，init（）方法之前执行。
public void init() {
    WebCallbackManager.setUrlBlockHandler(new CustomUrlBlockHandler());
}

去掉@SentinelResource注解然后访问资源出现了

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{"code":500,"message":"Wrong state for SentinelResource annotation","currentPage":1,"total":1,"data":null}

解决方法

找到出现该异常的代码块，在SentinelResourceAspect中

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@Pointcut("@annotation(com.alibaba.csp.sentinel.annotation.SentinelResource)")
public void sentinelResourceAnnotationPointcut() {
}

@Around("sentinelResourceAnnotationPointcut()")
public Object invokeResourceWithSentinel(ProceedingJoinPoint pjp) throws Throwable {
    Method originMethod = this.resolveMethod(pjp);
    SentinelResource annotation = (SentinelResource)originMethod.getAnnotation(SentinelResource.class);
    if (annotation == null) {
        throw new IllegalStateException("Wrong state for SentinelResource annotation");
    } else {
        String resourceName = this.getResourceName(annotation.value(), originMethod);
        EntryType entryType = annotation.entryType();
        int resourceType = annotation.resourceType();
        Entry entry = null;

        Object var10;
        try {
            Object var18;
            try {
                entry = SphU.entry(resourceName, resourceType, entryType, pjp.getArgs());
                Object result = pjp.proceed();
                var18 = result;
                return var18;
            } catch (BlockException var15) {
                var18 = this.handleBlockException(pjp, annotation, var15);
                return var18;
            } catch (Throwable var16) {
                Class<? extends Throwable>[] exceptionsToIgnore = annotation.exceptionsToIgnore();
                if (exceptionsToIgnore.length > 0 && this.exceptionBelongsTo(var16, exceptionsToIgnore)) {
                    throw var16;
                }
            }

            if (!this.exceptionBelongsTo(var16, annotation.exceptionsToTrace())) {
                throw var16;
            }

            this.traceException(var16, annotation);
            var10 = this.handleFallback(pjp, annotation, var16);
        } finally {
            if (entry != null) {
                entry.exit(1, pjp.getArgs());
            }

        }

        return var10;
    }
}

方法的pointcut是标注了@SentinelResource注解的方法，但是奇怪的是我并没有标注这个注解，访问资源的时候进到了这个切面。

一开始以为是热部署问题，然后重启了服务，再次访问。。。。

居然可以了。。。。

好吧，这个问题实在是不值得记录，写都写了，就这样吧，还需要提升自己处理bug的能力。

异常记录

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