问题
The following ERROR is logged on the gateway worker nodes on start-up.
2016-08-23 12:32:42,344 [-] [Timer-5] ERROR KeyTemplateRetriever Exception when retrieving throttling data from remote endpoint
Unexpected character (<) at position 0.
at org.json.simple.parser.Yylex.yylex(Unknown Source)
at org.json.simple.parser.JSONParser.nextToken(Unknown Source)
at org.json.simple.parser.JSONParser.parse(Unknown Source)
at org.json.simple.parser.JSONParser.parse(Unknown Source)
at org.json.simple.parser.JSONParser.parse(Unknown Source)
at org.wso2.carbon.apimgt.gateway.throttling.util.KeyTemplateRetriever.retrieveKeyTemplateData(KeyTemplateRetriever.java:100)
at org.wso2.carbon.apimgt.gateway.throttling.util.KeyTemplateRetriever.loadKeyTemplatesFromWebService(KeyTemplateRetriever.java:111)
at org.wso2.carbon.apimgt.gateway.throttling.util.KeyTemplateRetriever.run(KeyTemplateRetriever.java:54)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)
Despite the error the gateway worker nodes startup and the environment can be used to successfully invoke a sample API.
All the apim nodes, bar the traffic manager, however report these warnings
2016-08-22 16:40:56,652 [-] [Timer-5] WARN KeyTemplateRetriever Failed retrieving throttling data from remote endpoint: Connection refused. Retrying after 15 seconds...
2016-08-22 16:40:56,653 [-] [Timer-4] WARN BlockingConditionRetriever Failed retrieving Blocking Conditions from remote endpoint: Connection refused. Retrying after 15 seconds...
Environment:
- APIM 2.0.0 cluster
- publisher (default profile)
- store (default profile)
- gw manager and 2 gw workers (default profiles)
- traffic manager (using traffic-manager profile)
- Database: MariaDB Server, wsrep_25.10.r4144
- Userstore : Read/write LDAP
- JVM: java version "1.8.0_92"
- OS: CentOS Linux release 7.0.1406 (Core)
- n.b. key manager un-configured using default pack settings
回答1:
If you disable Advanced Throttling in api-manager.xml like below, that error will go away. If you enable that, it requires a key manager node.
<EnableAdvanceThrottling>false</EnableAdvanceThrottling>
回答2:
I encountered the issue recently and the issue was throttle#data#v1.war (repository/deployment/server/webapps/throttle#data#v1.war) hasn't been deployed at the time worker starts up. If you have a distributed AM 2.0 deployment make sure Keymanager is up and throttle#data#v1.war is deployed in keymanager before worker srartup..
来源：https://stackoverflow.com/questions/39101064/error-on-api-manager-2-0-0-gateway-worker-on-start-up