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Posted to dev@knox.apache.org by "Sandor Molnar (Jira)" <ji...@apache.org> on 2022/06/03 05:06:00 UTC
[jira] [Work started] (KNOX-2756) NPE occurred while getting service discovery types
[ https://issues.apache.org/jira/browse/KNOX-2756?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on KNOX-2756 started by Sandor Molnar.
-------------------------------------------
> NPE occurred while getting service discovery types
> --------------------------------------------------
>
> Key: KNOX-2756
> URL: https://issues.apache.org/jira/browse/KNOX-2756
> Project: Apache Knox
> Issue Type: Bug
> Components: Server
> Affects Versions: 2.0.0
> Reporter: Sandor Molnar
> Assignee: Sandor Molnar
> Priority: Blocker
> Fix For: 2.0.0
>
>
> With KNOX-2742 we added the ability to retry automated service discovery using Cloudera Manager in case od certain connection errors.
> To be able to do that, the newly introduced retry parameters are configured during the init phase of when an instance of {{ClouderaManagerServiceDiscovery}} is created.
> This implementation takes the {{gatewayConfig}} object granted, which is always there when Knox actually uses the service discovery in the descriptors.
> However, there is another use case if this class added by KNOX-1914: on our Admin UI, when creating/updating descriptors, there is a call to fetch the available service discoveries to be able to display in a dropdown list. This call creates the {{ClouderaManagerServiceDiscovery}} instance in a way that the given {{gatewayConfig}} attribute is {{null}} -> a NPE exception is thrown:
> {noformat}
> $ curl -iku admin:admin-password https://localhost:8443/gateway/admin/api/v1/servicediscoveries
> HTTP/1.1 500 Server Error
> Set-Cookie: KNOXSESSIONID=node010wlhopeuv6je1hcl8qc480wq50.node0; Path=/gateway/admin; Secure; HttpOnly
> Set-Cookie: rememberMe=deleteMe; Path=/gateway/admin; Max-Age=0; Expires=Thu, 02-Jun-2022 05:02:44 GMT; SameSite=lax
> Cache-Control: must-revalidate,no-cache,no-store
> Content-Type: text/html;charset=iso-8859-1
> Content-Length: 434
> Connection: close
> <html>
> <head>
> <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
> <title>Error 500 Request failed.</title>
> </head>
> <body><h2>HTTP ERROR 500 Request failed.</h2>
> <table>
> <tr><th>URI:</th><td>/gateway/admin/api/v1/servicediscoveries</td></tr>
> <tr><th>STATUS:</th><td>500</td></tr>
> <tr><th>MESSAGE:</th><td>Request failed.</td></tr>
> <tr><th>SERVLET:</th><td>admin-knox-gateway-servlet</td></tr>
> </table>
> </body>
> </html> {noformat}
> In {{gateway.log:}}
> {noformat}
> 2022-06-03 07:02:45,686 c4d26549-91c8-41d1-a44e-1c1dead70d30 ERROR knox.gateway (GatewayFilter.java:doFilter(189)) - Gateway processing failed: javax.servlet.ServletException: org.apache.shiro.subject.ExecutionException: java.security.PrivilegedActionException: javax.servlet.ServletException: java.lang.NullPointerException
> javax.servlet.ServletException: org.apache.shiro.subject.ExecutionException: java.security.PrivilegedActionException: javax.servlet.ServletException: java.lang.NullPointerException
> at org.apache.shiro.web.servlet.AdviceFilter.cleanup(AdviceFilter.java:196) ~[shiro-web-1.8.0.jar:1.8.0]
> ...
> Caused by: java.lang.NullPointerException
> at org.apache.knox.gateway.topology.discovery.cm.ClouderaManagerServiceDiscovery.configureRetryParams(ClouderaManagerServiceDiscovery.java:120) ~[gateway-discovery-cm-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
> at org.apache.knox.gateway.topology.discovery.cm.ClouderaManagerServiceDiscovery.<init>(ClouderaManagerServiceDiscovery.java:116) ~[gateway-discovery-cm-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
> at org.apache.knox.gateway.topology.discovery.cm.ClouderaManagerServiceDiscovery.<init>(ClouderaManagerServiceDiscovery.java:100) ~[gateway-discovery-cm-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
> at org.apache.knox.gateway.topology.discovery.cm.ClouderaManagerServiceDiscoveryType.newInstance(ClouderaManagerServiceDiscoveryType.java:35) ~[gateway-discovery-cm-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT]
> at org.apache.knox.gateway.topology.discovery.ServiceDiscoveryFactory.lambda$0(ServiceDiscoveryFactory.java:54) ~[gateway-spi-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT] {noformat}
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