I use the application GenealogyJ with Java and also here with the version 9 it does not work anymore.
Another question:
On my system is installed a lot of JRE stuff:
ii default-jre-headless 2:1.9-62 amd64 Standard Java or Java compatible Runtime (headless)
ii gcj-4.7-jre 4.7.3-2 amd64 Java runtime environment using GIJ/classpath
ii gcj-4.7-jre-headless 4.7.3-2 amd64 Java runtime environment using GIJ/classpath (headless version)
ii gcj-4.7-jre-lib 4.7.3-2 all Java runtime library for use with gcj (jar files)
ii gcj-4.8-jre 4.8.5-4 amd64 Java runtime environment using GIJ/Classpath
ii gcj-4.8-jre-headless 4.8.5-4 amd64 Java runtime environment using GIJ/Classpath (headless version)
ii gcj-4.8-jre-lib 4.8.5-4 all Java runtime library for use with gcj (jar files)
ii gcj-4.9-jre 4.9.4-2 amd64 Java runtime environment using GIJ/Classpath
ii gcj-4.9-jre-headless 4.9.4-2 amd64 Java runtime environment using GIJ/Classpath (headless version)
ii gcj-4.9-jre-lib 4.9.4-2 all Java runtime library for use with gcj (jar files)
rc gcj-5-jre-headless 5.5.0-8 amd64 Java runtime environment using GIJ/Classpath (headless version)
rc gcj-6-jre-headless 6.4.0-13 amd64 Java runtime environment using GIJ/Classpath (headless version)
ii gcj-6-jre-lib 6.4.0-13 all Java runtime library for use with gcj (jar files)
ii openjdk-8-jre:amd64 8u162-b12-1 amd64 OpenJDK Java runtime, using Hotspot JIT
ii openjdk-8-jre-headless:amd64 8u162-b12-1 amd64 OpenJDK Java runtime, using Hotspot JIT (headless)
ii openjdk-9-jre-headless:amd64 9.0.4+12-2 amd64 OpenJDK Java runtime, using Hotspot JIT (headless)
Do I need all of them?