This is a "Hello Graal" Java example for GraalVM. The structure of the Hello package is like this:

.
| src
|   `--com/
|      `-- hello
|          `-- Graal.java
|-- LICENSE
|-- .gitignore
|-- manifest.txt
`-- README.md

1. Download and install GraalVM. You can download the latest GraalVM here.

2. Put GraalVM on the PATH:

export PATH=path/to/graal/bin:$PATH
java -version

On Oracle Linux or Red Hat:

sudo yum -y install graalvm22-ee-<11 or 17>-<version>.el7.x86_64
sudo yum -y install graalvm22-ee-<11 or 17-native-image
java -version

On a Debian based Linux machine:

export GRAAL_ZIP=graalvm-ce-java<11 or 17-linux-amd64-<version>.tar.gz
wget https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-<version>/$GRAAL_ZIP
tar -zxvf $GRAAL_ZIP
rm $GRAAL_ZIP
export PATH=/root/graalvm-ce-java<11 or 17-<version>/bin:$PATH
java -version
gu install native-image

3. Download or clone the repository and navigate into the functionGraphDemo directory:

git clone https://github.com/graalvm/graalvm-demos
cd HelloGraal

1. Compile the application running the follow command:

javac -d build src/com/hello/Graal.java

This generates the Graal.class file into build/com/hello directory.

2. Run the application from a class file:

java -cp ./build com.hello.Graal

It outputs the message "hello graal".

1. reate a JAR for the application, running the follow command:

jar cfvm Hello.jar manifest.txt -C build .
jar tf Hello.jar

The output will be:

META-INF/
META-INF/MANIFEST.MF
com/
com/hello/
com/hello/Graal.class

2. Run the JAR file:

java -jar Hello.jar

It outputs the message "hello graal".

1. Create a native executable of a JAR file:

native-image -jar Hello.jar

The executable called ./Hello will be created in the working directory.

2. Execute it:

./Hello

It outputs the message "hello graal". To check the filesize of the executable image, run: ls -lh Hello.

1. Creating a JAR File

2. Setting an Application's Entry Point

3. How to create a Native Image