Apache ActiveMQ version 5.19.0 and higher requires Java 11 at minimum to operate. CA SOI 4.2 CU5 is architecturally based on Java 8. Because the SOI 4.2 framework and its bundled JRE do not meet the Java 11 requirement, the newer ActiveMQ binaries cannot initialize, causing the service to fail upon startup.
To use ActiveMQ 5.19.x or newer, an upgrade to a Java 11-based version of SOI is required.