[KNOX-1851] NPE on startup when Zookeeper Remote Alias Service is configured

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.0
• Fix Version/s: 1.3.0
• Component/s: Server
• Assignee: Sandeep More
• Reporter: Sandeep More
• Created: 09/Apr/19 20:51
• Updated: 21/Oct/19 14:23
• Resolved: 11/Apr/19 04:00

Description

When ZK remote alias service is configured Knox fails to start with the following NPE

2019-04-09 16:34:47,894 FATAL knox.gateway (GatewayServer.java:main(177)) - Failed to start gateway: java.lang.NullPointerException
java.lang.NullPointerException
    at org.apache.knox.gateway.services.security.impl.ZookeeperRemoteAliasService.ensureEntry(ZookeeperRemoteAliasService.java:120)
    at org.apache.knox.gateway.services.security.impl.ZookeeperRemoteAliasService.ensureEntries(ZookeeperRemoteAliasService.java:408)
    at org.apache.knox.gateway.services.security.impl.ZookeeperRemoteAliasService.init(ZookeeperRemoteAliasService.java:326)
    at org.apache.knox.gateway.services.security.impl.RemoteAliasService.init(RemoteAliasService.java:260)
    at org.apache.knox.gateway.services.DefaultGatewayServices.init(DefaultGatewayServices.java:91)
    at org.apache.knox.gateway.GatewayServer.main(GatewayServer.java:168)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.knox.gateway.launcher.Invoker.invokeMainMethod(Invoker.java:68)
    at org.apache.knox.gateway.launcher.Invoker.invoke(Invoker.java:39)
    at org.apache.knox.gateway.launcher.Command.run(Command.java:99)
    at org.apache.knox.gateway.launcher.Launcher.run(Launcher.java:75)
    at org.apache.knox.gateway.launcher.Launcher.main(Launcher.java:52)

Issue Links

• is caused by: KNOX-1789 Refactor RemoteAliasService to use service loading
• is related to: KNOX-1852 Simplify ZookeeperRemoteAliasService and make it generic
• links to: GitHub Pull Request #86
• links to: GitHub Pull Request #87