The complete error message is as follows
`2019-10-22 14:36:02.003 INFO 2788 --- [ main]
o.a.c.f.imps.CuratorFrameworkImpl : Starting
2019-10-22 14:36:02.008 INFO 2788 --- [ main]
org.apache.zookeeper.ZooKeeper : Initiating client connection,
connectString=longsun_host1:2181,longsun_host2:2182,longsun_host3:2183
sessionTimeout=60000 watcher=org.apache.curator.ConnectionState@1d3e0e96
2019-10-22 14:36:02.016 INFO 2788 --- [ main]
org.apache.zookeeper.common.X509Util : Setting -D
jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS
renegotiation
2019-10-22 14:36:02.023 INFO 2788 --- [ main]
org.apache.zookeeper.ClientCnxnSocket : jute.maxbuffer value is 4194304 Bytes
2019-10-22 14:36:02.034 INFO 2788 --- [ main]
org.apache.zookeeper.ClientCnxn : zookeeper.request.timeout value is
0. feature enabled=
2019-10-22 14:36:02.043 INFO 2788 --- [sun_host1:2181)]
org.apache.zookeeper.ClientCnxn : Opening socket connection to server
longsun_host1/192.168.1.154:2181. Will not attempt to authenticate using SASL
(unknown error)
2019-10-22 14:36:02.045 INFO 2788 --- [sun_host1:2181)]
org.apache.zookeeper.ClientCnxn : Socket connection established,
initiating session, client: /192.168.1.118:51963, server:
longsun_host1/192.168.1.154:2181
2019-10-22 14:36:02.050 INFO 2788 --- [sun_host1:2181)]
org.apache.zookeeper.ClientCnxn : Unable to read additional data from
server sessionid 0x0, likely server has closed socket, closing socket
connection and attempting reconnect
2019-10-22 14:36:02.052 INFO 2788 --- [ main]
o.a.c.f.imps.CuratorFrameworkImpl : Default schema
[22/10/19 14:36:02:052 CST] main INFO zookeeper.ZookeeperTransporter: [DUBBO]
No valid zookeeper client found from cache, therefore create a new client for
url.
zookeeper://longsun_host1:2181/ConfigCenterConfig?backup=longsun_host2:2182,longsun_host3:2183&config.check=true&config.config-file=dubbo.properties&config.group=dubbo&config.highest-priority=false&config.namespace=dubbo&config.timeout=3000,
dubbo version: 2.7.3, current host: 192.168.1.118
2019-10-22 14:36:02.637 INFO 2788 --- [sun_host2:2182)]
org.apache.zookeeper.ClientCnxn : Opening socket connection to server
longsun_host2/192.168.1.155:2182. Will not attempt to authenticate using SASL
(unknown error)
2019-10-22 14:36:02.638 INFO 2788 --- [sun_host2:2182)]
org.apache.zookeeper.ClientCnxn : Socket connection established,
initiating session, client: /192.168.1.118:51964, server:
longsun_host2/192.168.1.155:2182
2019-10-22 14:36:02.648 INFO 2788 --- [sun_host2:2182)]
org.apache.zookeeper.ClientCnxn : Session establishment complete on
server longsun_host2/192.168.1.155:2182, sessionid = 0x200007697c40008,
negotiated timeout = 40000
2019-10-22 14:36:02.657 INFO 2788 --- [ain-EventThread]
o.a.c.f.state.ConnectionStateManager : State change: CONNECTED
2019-10-22 14:36:02.672 INFO 2788 --- [ain-EventThread]
o.a.c.framework.imps.EnsembleTracker : New config event received:
{server.1=zoo1:2888:3888:participant;0.0.0.0:2181, version=0,
server.3=zoo3:2888:3888:participant;0.0.0.0:2181,
server.2=0.0.0.0:2888:3888:participant;0.0.0.0:2181}
2019-10-22 14:36:07.186 ERROR 2788 --- [ain-EventThread]
o.a.c.f.imps.CuratorFrameworkImpl : Background exception was not
retry-able or retry gave up
java.lang.NullPointerException: null
at
org.apache.curator.framework.imps.EnsembleTracker.configToConnectionString(EnsembleTracker.java:179)
~[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.EnsembleTracker.processConfigData(EnsembleTracker.java:200)
~[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.EnsembleTracker.access$300(EnsembleTracker.java:50)
~[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.EnsembleTracker$2.processResult(EnsembleTracker.java:144)
~[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:865)
[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:635)
[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.WatcherRemovalFacade.processBackgroundOperation(WatcherRemovalFacade.java:152)
[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.GetConfigBuilderImpl$2.processResult(GetConfigBuilderImpl.java:222)
[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:598)
[zookeeper-3.5.5.jar:3.5.5]
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)
[zookeeper-3.5.5.jar:3.5.5]
2019-10-22 14:36:07.187 INFO 2788 --- [ain-EventThread]
o.a.c.framework.imps.EnsembleTracker : New config event received:
{server.1=zoo1:2888:3888:participant;0.0.0.0:2181, version=0,
server.3=zoo3:2888:3888:participant;0.0.0.0:2181,
server.2=0.0.0.0:2888:3888:participant;0.0.0.0:2181}
2019-10-22 14:36:07.187 ERROR 2788 --- [ain-EventThread]
o.a.c.f.imps.CuratorFrameworkImpl : Background exception was not
retry-able or retry gave up
java.lang.NullPointerException: null
at
org.apache.curator.framework.imps.EnsembleTracker.configToConnectionString(EnsembleTracker.java:179)
~[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.EnsembleTracker.processConfigData(EnsembleTracker.java:200)
~[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.EnsembleTracker.access$300(EnsembleTracker.java:50)
~[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.EnsembleTracker$2.processResult(EnsembleTracker.java:144)
~[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:865)
[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:635)
[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.WatcherRemovalFacade.processBackgroundOperation(WatcherRemovalFacade.java:152)
[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.curator.framework.imps.GetConfigBuilderImpl$2.processResult(GetConfigBuilderImpl.java:222)
[curator-framework-4.0.1.jar:4.0.1]
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:598)
[zookeeper-3.5.5.jar:3.5.5]
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:510)
[zookeeper-3.5.5.jar:3.5.5]
[22/10/19 14:36:07:207 CST] main WARN config.ConfigurationUtils: [DUBBO] You
specified the config centre, but there's not even one single config item in
it., dubbo version: 2.7.3, current host: 192.168.1.118
[22/10/19 14:36:07:208 CST] main WARN config.ConfigurationUtils: [DUBBO] You
specified the config centre, but there's not even one single config item in
it., dubbo version: 2.7.3, current host: 192.168.1.118
[22/10/19 14:36:07:217 CST] main WARN config.AbstractConfig: [DUBBO] There's
no valid metadata config found, if you are using the simplified mode of
registry url, please make sure you have a metadata address configured
properly., dubbo version: 2.7.3, current host: 192.168.1.118`
[ Full content available at: https://github.com/apache/dubbo/issues/5173 ]
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