IntelliJ IDEA not Showing anything endpoints tab: "Failed to retrieve application JMX service URL"

I also encountered this problem and finally found the answer:

Starting from 2018.3.4 IntelliJ IDEA use local JMX connector for retrieving Spring Boot actuator endpoint's data. Local JMX monitoring has some restrictions, in particular, it isn't possible to get local JMX connector address if Spring Boot application and IntelliJ IDEA JVMs have different bitness. If it is not possible to run application on JVM with the same bitness, then, in order to fix the problem, one could add the following to Spring Boot run configuration's VM options:

-Dcom.sun.management.jmxremote.port={some_port} -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false

After setting:

jetbrains issue link:https://youtrack.jetbrains.com/issue/IDEA-204797