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From: Chapman Flack <[email protected]>
To: [email protected] <[email protected]>
Subject: Java 14 "Helpful NullPointerExceptions"
Date: Sat, 30 May 2020 15:16:35 -0400
Message-ID: <[email protected]> (raw)

There is a great option to add in pljava.vmoptions when running on
Java 14 or later:

  -XX:+ShowCodeDetailsInExceptionMessages


It arranges so that if a NullPointerException is ever thrown, instead of

  ERROR:  java.lang.NullPointerException

you see something like

  ERROR:  java.lang.NullPointerException: Cannot assign field "i" because
"a" is null


A little thing, but handy, and very easy to enable. It doesn't add to the
cost of null-pointer exceptions thrown and caught internally, because the
work is only done if the message is used. [1]

-Chap


[1] https://openjdk.java.net/jeps/358

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