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https://issues.apache.org/jira/browse/FLINK-15773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17024994#comment-17024994
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Aljoscha Krettek commented on FLINK-15773:
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[~jvilcek] I think you're right! I don't know yet how that implementation of
{{writeReplace}} works for subclasses of {{DateTimeZone}} but in Java
{{writeReplace}} methods of superclasses are used. The situation is a bit
complicated though:
https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html:
bq. This writeReplace method is invoked by serialization if the method exists
and it would be accessible from a method defined within the class of the object
being serialized. Thus, the method can have private, protected and
package-private access. Subclass access to this method follows java
accessibility rules.
it's not enough that a superclass has the method but it must also be accessible
from the subclass, which is the case for {{DateTimeZone}}.
> ClosureCleaner fails with joda DateTimeZone
> -------------------------------------------
>
> Key: FLINK-15773
> URL: https://issues.apache.org/jira/browse/FLINK-15773
> Project: Flink
> Issue Type: Bug
> Components: API / Core
> Affects Versions: 1.9.1
> Reporter: Jozef Vilcek
> Priority: Minor
>
> Flink fails to launch my Apache Beam job which uses windowing function with
> time zone. Closure cleaner reports time zone as not serializable. Part of
> stack trace:
>
> {noformat}
> org.joda.time.tz.DateTimeZoneBuilder$OfYear@3b035d0c is not serializable. The
> object probably contains or references non serializable fields.
>
> org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:151)
>
> org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126)
>
> org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126)
>
> org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126)
>
> org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126)
>
> org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126)
>
> org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:126)
> org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:71)
> org.apache.flink.api.java.DataSet.clean(DataSet.java:186)
> org.apache.flink.api.java.DataSet.flatMap(DataSet.java:267)
> ....{noformat}
> Actual instance of DateTimeZone is
> [PrecalculatedZone|https://github.com/JodaOrg/joda-time/blob/v2.10.5/src/main/java/org/joda/time/tz/DateTimeZoneBuilder.java#L1373]
> which itself is serializable but it's fields are not necessarily standalone
> java serializable, because enclosing class it managing their serialization
> and deserialization.
>
>
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