zentol commented on a change in pull request #94:
URL: https://github.com/apache/flink-docker/pull/94#discussion_r768406098



##########
File path: add-custom.sh
##########
@@ -12,7 +12,7 @@ function usage() {
 
 binary_download_url=
 name=custom
-java_version=8
+java_version=${DEFAULT_JAVA}

Review comment:
       Shouldn't we rather fail in this very line if DEFAULT_JAVA is not set? 
And that you could achieved with `-u`.
   The benefit being that this will fail hard if we're making a change to 
generator.sh that removes DEFAULT_JAVA, instead of continuing to work if all 
tests use `-j`.




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