I’m getting some weird occasional nulls using Hand...

# http4k

[dmcg]

I’m getting some weird occasional nulls using Handlebars. They show up with the approver as
expected <td style="text-align: right">£1.00</td>
actual <td style="text-align: right">[NUL][NUL].[NUL][NUL]</td>
ie actual \0 in the output.
Seems to be one in every few runs, randomly. Rerunning things are fine.
Has anyone else seen anything similar?

[dmcg]

Ah, is DecimalFormat not thread safe? Doh

java.lang.NullPointerException: Cannot store to char array because "this.fastPathData.fastPathContainer" is null

	at java.base/java.text.DecimalFormat.resetFastPathData(DecimalFormat.java:1152)
	at java.base/java.text.DecimalFormat.checkAndSetFastPathStatus(DecimalFormat.java:1081)
	at java.base/java.text.DecimalFormat.fastFormat(DecimalFormat.java:1659)
	at java.base/java.text.NumberFormat.format(NumberFormat.java:327)

[dave]

wat?! 🙄

[dmcg]

It’s amazing isn’t it. I was using NumberFormat.getCurrencyInstance(Locale._UK_), which returns NumberFormat , which says Number formats are generally not synchronized.