https://github.com/fdelporte/crac-javafx-example
JavaFX example application to experiment with CRaC
https://github.com/fdelporte/crac-javafx-example
Last synced: 3 months ago
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JavaFX example application to experiment with CRaC
- Host: GitHub
- URL: https://github.com/fdelporte/crac-javafx-example
- Owner: FDelporte
- Created: 2023-11-30T14:01:21.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2023-12-01T07:20:29.000Z (over 1 year ago)
- Last Synced: 2025-01-13T14:53:00.737Z (4 months ago)
- Language: Java
- Size: 7.81 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# CRaC JavaFX Example Application
Based on [github.com/CRaC/example-jetty](https://github.com/CRaC/example-jetty) to experiment with the use
of [CRaC](https://docs.azul.com/core/crac/crac-introduction).
## 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](https://webtechie.be/post/2023-10-16-crac-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:
```bash
$ sdk install java 21.0.1.crac-zulu
```
### Get the Project
```bash
$ git clone https://github.com/FDelporte/crac-javafx-example.git
$ cd crac-javafx-example
```
### Build and Initial Run
#### First Terminal
```bash
$ mvn package
$ java -XX:CRaCCheckpointTo=cr -jar target/crac-javafx-example.jar
```
#### Second Terminal
```bash
$ jcmd target/crac-javafx-example.jar JDK.checkpoint
```
**First attempt 20231201**
Output in the program terminal:
```text
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:
```text
$ 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
```bash
$ java -XX:CRaCRestoreFrom=cr
```