現(xiàn)象

項目在公司網(wǎng)絡(luò)啟動時，能正常啟動。但通過vpn連接到公司網(wǎng)絡(luò)時卻無法啟動報下面的錯誤java.lang.IllegalStateException: zookeeper not connected。

Caused by: java.lang.IllegalStateException: zookeeper not connected
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:84)
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperTransporter.createZookeeperClient(CuratorZookeeperTransporter.java:26)
	at org.apache.dubbo.remoting.zookeeper.AbstractZookeeperTransporter.connect(AbstractZookeeperTransporter.java:68)
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.<init>(ZookeeperDynamicConfiguration.java:66)
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:43)
	at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.lambda$getDynamicConfiguration$0(AbstractDynamicConfigurationFactory.java:39)
	at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
	at org.apache.dubbo.common.config.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:39)
	at org.apache.dubbo.common.config.configcenter.DynamicConfiguration.getDynamicConfiguration(DynamicConfiguration.java:224)
	at org.apache.dubbo.config.bootstrap.DubboBootstrap.prepareEnvironment(DubboBootstrap.java:1024)
	at org.apache.dubbo.config.bootstrap.DubboBootstrap.startConfigCenter(DubboBootstrap.java:619)
	at org.apache.dubbo.config.bootstrap.DubboBootstrap.initialize(DubboBootstrap.java:521)
	at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:244)
	at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:206)
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:165)
	at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.getInjectedObject(AbstractAnnotationBeanPostProcessor.java:409)
	at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor$AnnotatedFieldElement.inject(AbstractAnnotationBeanPostProcessor.java:626)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
	at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.postProcessPropertyValues(AbstractAnnotationBeanPostProcessor.java:179)
	... 78 common frames omitted
Caused by: java.lang.IllegalStateException: zookeeper not connected
	at org.apache.dubbo.remoting.zookeeper.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:81)
	... 96 common frames omitted
Disconnected from the target VM, address: '127.0.0.1:52979', transport: 'socket'

Process finished with exit code 1

猜測：連接到zookeeper的服務(wù)器網(wǎng)絡(luò)策略不通
— 通過telnet證實端口網(wǎng)絡(luò)時通的。該猜測不成立。

定位問題

進一步經(jīng)過報錯的日志，找到對應(yīng)的源碼。

public class CuratorZookeeperClient extends AbstractZookeeperClient<CuratorZookeeperClient.NodeCacheListenerImpl, CuratorZookeeperClient.CuratorWatcherImpl> {

    protected static final Logger logger = LoggerFactory.getLogger(CuratorZookeeperClient.class);
    private static final String ZK_SESSION_EXPIRE_KEY = "zk.session.expire";

    static final Charset CHARSET = StandardCharsets.UTF_8;
    private final CuratorFramework client;
    private static Map<String, NodeCache> nodeCacheMap = new ConcurrentHashMap<>();

    public CuratorZookeeperClient(URL url) {
        super(url);
        try {
            int timeout = url.getParameter(TIMEOUT_KEY, DEFAULT_CONNECTION_TIMEOUT_MS);
            int sessionExpireMs = url.getParameter(ZK_SESSION_EXPIRE_KEY, DEFAULT_SESSION_TIMEOUT_MS);
            CuratorFrameworkFactory.Builder builder = CuratorFrameworkFactory.builder()
                    .connectString(url.getBackupAddress())
                    .retryPolicy(new RetryNTimes(1, 1000))
                    .connectionTimeoutMs(timeout)
                    .sessionTimeoutMs(sessionExpireMs);
            String authority = url.getAuthority();
            if (authority != null && authority.length() > 0) {
                builder = builder.authorization("digest", authority.getBytes());
            }
            client = builder.build();
            client.getConnectionStateListenable().addListener(new CuratorConnectionStateListener(url));
            client.start();
            boolean connected = client.blockUntilConnected(timeout, TimeUnit.MILLISECONDS);
            if (!connected) {
                throw new IllegalStateException("zookeeper not connected");
            }
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }

可以看出 是 boolean connected = client.blockUntilConnected(timeout, TimeUnit.MILLISECONDS); 這里 connected 返回了fasle導(dǎo)致的問題。
然后下端點， 發(fā)現(xiàn)timeout = 3000 ，也就說3秒內(nèi)需要鏈接成功，否則就會超時。

推測由于vpn的方式連接的 zk服務(wù)器，很有可能是 3秒內(nèi)沒有得到服務(wù)端的正確響應(yīng)，而導(dǎo)致了異常，然后拋出了異常。

基于上的推測，將該timeout的默認(rèn)值3000改大一些后，然后就啟動成功了。

解決

修改dubbo的配置，下面是springboot的項目，修改的方式。
從上面的報錯信息是可以看出是 configcenter的連接超時。下面配置了三個配置的超時時間，可根據(jù)情況進行配置。

dubbo:
  config-center:
    timeout: 60000
  metadata-report:
    timeout: 60000
  registry:
    timeout: 60000

注意： 有可能版本的問題，上面3個屬性，全部配置了，有可能項目啟動報錯， 請根據(jù)保持信息，適當(dāng)調(diào)整刪減屬性后重試。文章來源地址http://www.zghlxwxcb.cn/news/detail-503736.html

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