If you want to rebuild the JVMs or update to the latest version, here is guidance for building JVMs from the beginning.
HotSpot
Download source code from the following website:
https://openjdk-sources.osci.io/openjdk8/
https://openjdk-sources.osci.io/openjdk11/
Build by the following steps:
./configure --with-boot-jdk=[boot-jdk path]
make all
OpenJ9
Download source code.
git clone https://github.com/ibmruntimes/openj9-openjdk-jdk8.git
cd openj9-openjdk-jdk8
bash get_source.sh
Build.
bash configure --with-boot-jdk=[boot-jdk path]
make all
GraalVM
Download the installer package.
wget https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-22.0.0.2/graalvm-ce-java11-linux-amd64-22.0.0.2.tar.gz