[HADOOP-15234] Throw meaningful message on null when initializing KMSWebApp

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.1.0
• Component/s: kms
• Assignee: fang zhenyi
• Reporter: Xiao Chen
• Created: 14/Feb/18 16:53
• Updated: 19/Mar/18 18:32
• Resolved: 16/Mar/18 03:19

Description

During KMS startup, if the keyProvider is null, it will NPE inside KeyProviderExtension.

java.lang.NullPointerException
	at org.apache.hadoop.crypto.key.KeyProviderExtension.<init>(KeyProviderExtension.java:43)
	at org.apache.hadoop.crypto.key.CachingKeyProvider.<init>(CachingKeyProvider.java:93)
	at org.apache.hadoop.crypto.key.kms.server.KMSWebApp.contextInitialized(KMSWebApp.java:170)

We're investigating the exact scenario that could lead to this, but the NPE and log around it can be improved.