CRaC JavaFX Example Application

Based on github.com/CRaC/example-jetty to experiment with the use of CRaC.

Goal of the Application

This demo application aims to provide a basic JavaFX application to test its compatibility with CRaC.

FAT JAR

Created following this approach: https://medium.com/@kennydop/how-to-create-an-executable-jar-file-for-javafx-using-maven-f8a0039de1fa

Testing on Raspberry Pi

OS and Java

As described on the blog post Running a CRaC Java application on Raspberry Pi - UPDATE.

Raspberry Pi OS, 64-bit, Bookworm edition, released on October 11, 2023.
Azul Zulu Builds of OpenJDK, version 21 with CRaC:

$ sdk install java 21.0.1.crac-zulu

Get the Project

$ git clone https://github.com/FDelporte/crac-javafx-example.git
$ cd crac-javafx-example

Build and Initial Run

First Terminal

$ mvn package
$ java -XX:CRaCCheckpointTo=cr -jar target/crac-javafx-example.jar

Second Terminal

$ jcmd target/crac-javafx-example.jar JDK.checkpoint

First attempt 20231201

Output in the program terminal:

java -XX:CRaCCheckpointTo=cr -jar target/crac-javafx-example.jarar
Dec 01, 2023 7:15:15 AM com.sun.javafx.application.PlatformImpl startup
WARNING: Unsupported JavaFX configuration: classes were loaded from 'unnamed module @373564dd'
WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.
01/12/2023 07:15:18.544 | MainApplication                     | start                | INFO     | Starting the stage
01/12/2023 07:15:20.143 | MainApplication                     | start                | INFO     | Stage was started
01/12/2023 07:15:20.146 | MainApplication                     | start                | INFO     | Scheduled a task to update the data
01/12/2023 07:15:21.147 | MainWindow                          | setRandomValue       | INFO     | Setting gauge to 207.0
01/12/2023 07:15:22.146 | MainWindow                          | setRandomValue       | INFO     | Setting gauge to 178.0
...
01/12/2023 07:15:51.146 | MainWindow                          | setRandomValue       | INFO     | Setting gauge to 402.0
Dec 01, 2023 7:15:51 AM jdk.internal.crac.LoggerContainer info
INFO: Starting checkpoint
01/12/2023 07:15:51.508 | MainWindow                          | beforeCheckpoint     | INFO     | beforeCheckpoint was called
Dec 01, 2023 7:15:51 AM jdk.internal.crac.LoggerContainer info
INFO: /home/crac/crac-javafx-example/target/crac-javafx-example.jar is recorded as always available on restore
01/12/2023 07:15:51.852 | MainWindow                          | afterRestore         | INFO     | afterRestore was called
...

Error message in the terminal with jcmd, nothing gets created in the cr directory:

$ jcmd target/crac-javafx-example.jar JDK.checkpoint
2263:
An exception during a checkpoint operation:
jdk.internal.crac.mirror.CheckpointException
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenSocketException: FD fd=7 type=socket path=socket:[19379]
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:115)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenFileException: FD fd=8 type=character path=/dev/dri/card1
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:114)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenFileException: FD fd=9 type=character path=/dev/dri/card1
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:114)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenFileException: FD fd=10 type=character path=/dev/dri/renderD128
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:114)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenSocketException: FD fd=11 type=socket path=socket:[21172]
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:115)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenResourceException: FD fd=12 type=unknown path=anon_inode:[eventfd]
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:117)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenResourceException: FD fd=13 type=unknown path=anon_inode:[eventfd]
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:117)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenResourceException: FD fd=14 type=unknown path=anon_inode:[eventfd]
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:117)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenSocketException: FD fd=15 type=socket path=socket:[20304]
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:115)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)
	Suppressed: jdk.internal.crac.mirror.impl.CheckpointOpenResourceException: FD fd=16 type=unknown path=anon_inode:[eventfd]
		at java.base/jdk.internal.crac.mirror.Core.translateJVMExceptions(Core.java:117)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore1(Core.java:188)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestore(Core.java:286)
		at java.base/jdk.internal.crac.mirror.Core.checkpointRestoreInternal(Core.java:299)

Start From Snapshot

$ java -XX:CRaCRestoreFrom=cr