Java 17 no longer part of current raspberry pi build

[VK1MIC]

Script fails using the Deb process on the current raspberry pi software - current Java version is 21.

This is my work around

Create a dummy java 17 and install java 21:

1. Optional clean up of any previous dummy packages

for PKG in openjdk-17-jdk-fake fake-openjdk17; do
if dpkg -s "$PKG" >/dev/null 2>&1; then
echo "Removing old dummy package: $PKG"
sudo dpkg -r "$PKG"
fi
done

2. Install real Java 21 and equivs

sudo apt update
sudo apt install -y openjdk-21-jdk openjdk-21-jre equivs

Quick check

java -version

3. Create a dummy package that PROVIDES openjdk-17-jdk but depends on openjdk-21-jdk

mkdir -p ~/fake-openjdk17
cd ~/fake-openjdk17

cat > openjdk-17-jdk-fake << 'EOF'
Section: misc
Priority: optional
Standards-Version: 4.5.0

Package: openjdk-17-jdk-fake
Version: 17.0-1
Maintainer: Fake Java root@localhost
Architecture: all
Depends: openjdk-21-jdk
Provides: openjdk-17-jdk
Description: Dummy package that provides openjdk-17-jdk but uses openjdk-21-jdk
This meta package is only to satisfy packages that require openjdk-17-jdk.
EOF

Build and install the dummy package

equivs-build openjdk-17-jdk-fake

sudo dpkg -i openjdk-17-jdk-fake_17.0-1_all.deb

4. Make sure java points at 21 (if multiple Javas are installed)

sudo update-alternatives --config java

Final check

java -version
echo "If you see Java 21 here, you are good to go."