NPE upon captcha generation using Java 11

Description

Play! version: 1.5.3
Java version: openjdk version "11.0.5" 2019-10-15
OS: Ubuntu 18.04.3 LTS

Consider a Play app consisting of a controller that generates a captcha.

Create a test app

play new test

and change the application controller to

package controllers;

import play.mvc.Controller;
import play.libs.Images;

public class Application extends Controller {

    public static void index() {
        Images.Captcha captcha = Images.captcha();
        renderBinary(captcha);
    }

}

start play

play run

and open the browser at http://localhost:9000/

Although the captcha is rendered correctly, logs show an NPE being thrown:

09:21:41,358 WARN  ~ You're running Play! in DEV mode
09:21:41,418 INFO  ~ Listening for HTTP on port 9000 (Waiting a first request to start) ...
~ Server is up and running
09:21:46,206 INFO  ~ Application 'test' is now started !
java.lang.NullPointerException
	at jj.play.ns.com.jhlabs.image.TransformFilter.imageComplete(TransformFilter.java)
	at java.desktop/sun.awt.image.OffScreenImageSource.produce(OffScreenImageSource.java:193)
	at java.desktop/sun.awt.image.OffScreenImageSource.addConsumer(OffScreenImageSource.java:66)
	at java.desktop/sun.awt.image.OffScreenImageSource.startProduction(OffScreenImageSource.java:80)
	at java.desktop/java.awt.image.FilteredImageSource.startProduction(FilteredImageSource.java:184)
	at java.desktop/sun.awt.image.ImageRepresentation.startProduction(ImageRepresentation.java:732)
	at java.desktop/sun.awt.image.ToolkitImage.addWatcher(ToolkitImage.java:221)
	at java.desktop/sun.awt.image.ToolkitImage.getWidth(ToolkitImage.java:110)
	at java.desktop/sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:3407)
	at jj.play.ns.nl.captcha.util.ImageUtil.applyFilter(Unknown Source)
	at jj.play.ns.nl.captcha.gimpy.RippleGimpyRenderer.gimp(Unknown Source)
	at play.libs.Images$Captcha.check(Images.java:423)
	at play.libs.Images$Captcha.read(Images.java:406)
	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2146)
	at org.apache.commons.io.IOUtils.copy(IOUtils.java:2102)
	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2123)
	at play.mvc.results.RenderBinary.copyInputStreamAndClose(RenderBinary.java:207)
	at play.mvc.results.RenderBinary.renderInputStream(RenderBinary.java:197)
	at play.mvc.results.RenderBinary.apply(RenderBinary.java:157)
	at play.mvc.ActionInvoker.invoke(ActionInvoker.java:201)
	at play.server.PlayHandler$NettyInvocation.execute(PlayHandler.java:289)
	at play.Invoker$Invocation$1.apply(Invoker.java:319)
	at play.Invoker$Invocation$1.apply(Invoker.java:315)
	at play.db.jpa.JPA.withTransaction(JPA.java:349)
	at play.db.jpa.JPA.withinFilter(JPA.java:238)
	at play.db.jpa.JPAPlugin$TransactionalFilter.withinFilter(JPAPlugin.java:306)
	at play.Invoker$Invocation.withinFilter(Invoker.java:298)
	at play.Invoker$Invocation.run(Invoker.java:315)
	at play.server.PlayHandler$NettyInvocation.run(PlayHandler.java:266)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)

Expected Behavior

Ideally, the captcha would be generated correctly without the NPE being thrown.

Actual Behavior

Every time a captcha is generated, an NPE is thrown.

Reproducible Test Case

The actual behaviour is consistently reproducible by following the above-mentioned steps.
The behaviour is not reproducible when using Java 8 i.e. the captcha is generated and no NPE is thrown.

Start with play.libs.Images.Captcha, especially Images.java around Captcha.check and Captcha.read, then trace the call into jj.play.ns.com.jhlabs.image.TransformFilter and ImageUtil.applyFilter shown in the stack trace. Reproduce the captcha request on Java 11 and compare it with Java 8. Done means captcha generation completes without the reported NullPointerException.