find_java_runtime finds only latest java, even if others are installed

function find_java_runtime will only find latest java installed, regardless of other java versions available.

find_java_runtime java11 -> echo $JAVA_CMD -> /usr/lib/jvm/java-11-openjdk-amd64/bin/java
find_java_runtime java10 -> echo $JAVA_CMD -> /usr/lib/jvm/java-11-openjdk-amd64/bin/java
find_java_runtime java9 -> echo $JAVA_CMD -> /usr/lib/jvm/java-11-openjdk-amd64/bin/java
find_java_runtime java8 -> echo $JAVA_CMD -> /usr/lib/jvm/java-11-openjdk-amd64/bin/java
find_java_runtime java7 -> echo $JAVA_CMD -> /usr/lib/jvm/java-11-openjdk-amd64/bin/java

but:
# ll /usr/lib/jvm
total 72K
drwxr-xr-x 6 root root 4.0K Oct 3 03:01 ./
drwxr-xr-x 292 root root 44K Oct 3 13:10 ../
drwxr-xr-x 4 root root 4.0K Oct 2 06:07 java-1.5.0-gcj-4.8-amd64/
drwxr-xr-x 4 root root 4.0K Oct 2 06:07 java-1.5.0-gcj-5-amd64/
drwxr-xr-x 7 root root 4.0K Oct 2 06:35 java-7-openjdk-amd64/
drwxr-xr-x 7 root root 4.0K Oct 2 06:35 java-8-openjdk-amd64/
drwxr-xr-x 7 root root 4.0K Oct 2 06:35 java-9-openjdk-amd64/
drwxr-xr-x 7 root root 4.0K Oct 2 06:35 java-10-openjdk-amd64/
drwxr-xr-x 9 root root 4.0K Oct 2 06:36 java-11-openjdk-amd64/
lrwxrwxrwx 1 root root 25 Apr 8 15:16 default-java -> java-1.11.0-openjdk-amd64/
lrwxrwxrwx 1 root root 20 Jul 21 2016 java-1.7.0-openjdk-amd64 -> java-7-openjdk-amd64/
lrwxrwxrwx 1 root root 20 Jul 21 2016 java-1.8.0-openjdk-amd64 -> java-8-openjdk-amd64/
lrwxrwxrwx 1 root root 20 Jul 21 2016 java-1.9.0-openjdk-amd64 -> java-9-openjdk-amd64/
lrwxrwxrwx 1 root root 20 Jul 21 2016 java-1.10.0-openjdk-amd64 -> java-10-openjdk-amd64/
lrwxrwxrwx 1 root root 21 Aug 24 19:36 java-1.11.0-openjdk-amd64 -> java-11-openjdk-amd64/

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: java-wrappers 0.3
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Oct 3 16:37:57 2018
Dependencies:
 gcc-8-base 8.2.0-1ubuntu2~18.04
 libbz2-1.0 1.0.6-8.1
 libc6 2.27-3ubuntu1
 libgcc1 1:8.2.0-1ubuntu2~18.04
 unzip 6.0-21ubuntu1
InstallationDate: Installed on 2011-10-19 (2540 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
SourcePackage: java-wrappers
UpgradeStatus: Upgraded to bionic on 2018-10-02 (1 days ago)