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https://issues.apache.org/jira/browse/SPARK-25984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-25984:
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    Description: 
While working on JDK 11 support, I noticed a lot of new deprecation warnings. 
80% of them seem to be from two easily-fixable sources:

- Class.newInstance() is deprecated
- Almost all constructors from primitive wrapper classes like Integer are 
deprecated

These are easy to fix because there have long been equivalent, better 
alternatives:

- Just call .getConstructor().newInstance()
- Replace new Integer(x) with Integer.valueOf(x), etc

The latter has the advantage, for integral types, of not even allocating a new 
object for small values.

We should just fix these to clean up the build output.

  was:
While working on JDK 11 support, I noticed a lot of new deprecation warnings. 
80% of them seem to be from two easily-fixable sources:

- Class.newInstance() is deprecated
- Almost all constructors from primitive box classes like Integer are deprecated

These are easy to fix because there have long been equivalent, better 
alternatives:

- Just call .getConstructor().getInstance()
- Replace new Integer(x) with Integer.valueOf(x), etc

The latter has the advantage, for integral types, of not even allocating a new 
object for small values.

We should just fix these to clean up the build output.

        Summary: Remove deprecated .newInstance(), primitive wrapper class 
constructor calls  (was: Remove deprecated .newInstance(), primitive box class 
constructor calls)

> Remove deprecated .newInstance(), primitive wrapper class constructor calls
> ---------------------------------------------------------------------------
>
>                 Key: SPARK-25984
>                 URL: https://issues.apache.org/jira/browse/SPARK-25984
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Spark Core, SQL, Structured Streaming
>    Affects Versions: 3.0.0
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>            Priority: Minor
>
> While working on JDK 11 support, I noticed a lot of new deprecation warnings. 
> 80% of them seem to be from two easily-fixable sources:
> - Class.newInstance() is deprecated
> - Almost all constructors from primitive wrapper classes like Integer are 
> deprecated
> These are easy to fix because there have long been equivalent, better 
> alternatives:
> - Just call .getConstructor().newInstance()
> - Replace new Integer(x) with Integer.valueOf(x), etc
> The latter has the advantage, for integral types, of not even allocating a 
> new object for small values.
> We should just fix these to clean up the build output.



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