liran-funaro edited a comment on issue #9967:
URL: https://github.com/apache/druid/issues/9967#issuecomment-645992485
@yuanlihan I found the reason for the NPE. It due to a bug in the Oak
library.
For now, until we update this PR, you can solve it by upgrading Oak version.
Simply modify Oak's version in `druid/processing/pom.xml` file as follows,
then recompile using maven.
Note: If maven repository is not automatically updated for you, run the
`mvn` command with `-U` flag.
```diff
diff --git a/processing/pom.xml b/processing/pom.xml
index 50ccc9eb6a..ebe850e480 100644
--- a/processing/pom.xml
+++ b/processing/pom.xml
@@ -35,7 +35,7 @@
<dependency>
<groupId>com.yahoo.oak</groupId>
<artifactId>oak</artifactId>
- <version>0.2.1</version>
+ <version>0.2.2</version>
</dependency>
<dependency>
<groupId>org.apache.druid</groupId>
```
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