broken with newer java

Out of the box, freeplane doesn't start up:

% freeplane
*org.knopflerfish.framework.readonly=true
*org.knopflerfish.gosg.jars=reference:file:/usr/share/freeplane/core/
*org.freeplane.user.dir=/home/drewp
*org.freeplane.basedirectory=/usr/share/freeplane
org.freeplane.globalresourcedir=/usr/share/freeplane/resources
*java.security.policy=/usr/share/freeplane/freeplane.policy
*org.osgi.framework.storage=/usr/share/freeplane/fwdir
Exception in thread "main" java.lang.UnsupportedOperationException: The Security Manager is deprecated and will be removed in a future release
 at java.base/java.lang.System.setSecurityManager(System.java:425)
 at org.freeplane.launcher.Launcher.launchWithoutUICheck(Launcher.java:279)
 at org.freeplane.launcher.Launcher.main(Launcher.java:87)

% dpkg -l | grep jre
ii default-jre 2:1.17-74 amd64 Standard Java or Java compatible Runtime
ii default-jre-headless 2:1.17-74 amd64 Standard Java or Java compatible Runtime (headless)
ii openjdk-17-jre:amd64 17.0.8+7-1~23.04 amd64 OpenJDK Java runtime, using Hotspot JIT
ii openjdk-17-jre-headless:amd64 17.0.8+7-1~23.04 amd64 OpenJDK Java runtime, using Hotspot JIT (headless)
ii openjdk-19-jre:amd64 19.0.2+7-0ubuntu4 amd64 OpenJDK Java runtime, using Hotspot JIT
ii openjdk-19-jre-headless:amd64 19.0.2+7-0ubuntu4 amd64 OpenJDK Java runtime, using Hotspot JIT (headless)
ii openjdk-8-jre:amd64 8u382-ga-1~23.04.1 amd64 OpenJDK Java runtime, using Hotspot JIT
ii openjdk-8-jre-headless:amd64 8u382-ga-1~23.04.1 amd64 OpenJDK Java runtime, using Hotspot JIT (headless)

But this works:

% JAVA_CMD=/usr/lib/jvm/java-17-openjdk-amd64/bin/java freeplane

So I think freeplane needs to depend on, and then somehow use, an earlier version of java.