root@xxx-30 ~ # ps -aux | grep static
static-+ 22200  6.9  6.7 27588632 2224428 ?    Sl   Oct29 282:29 java -Xms1g -Xmx8g -Dlog4j.configurationFile=/opt/static-cache/log4j2.xml -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=11099 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.local.only=false -Djava.rmi.server.hostname=xxxxxx -jar static-cache-1.0-SNAPSHOT-jar-with-dependencies.jar --add-exports=java.base/jdk.internal.misc=ALL-UNNAMED --add-exports=java.base/sun.nio.ch=ALL-UNNAMED

root@xxx-30 ~ # jmap -dump:file=/root/static-cache.hprof 22200
22200: Unable to open socket file: target process not responding or HotSpot VM not loaded
The -F option can be used when the target process is not responding

root@xxx-30 ~ # jmap -dump:file=/root/static-cache.hprof 22200 -F
Attaching to core -F from executable 22200, please wait...
Error attaching to core file: cannot open binary file
sun.jvm.hotspot.debugger.DebuggerException: cannot open binary file
        at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach0(Native Method)
        at sun.jvm.hotspot.debugger.linux.LinuxDebuggerLocal.attach(LinuxDebuggerLocal.java:286)
        at sun.jvm.hotspot.HotSpotAgent.attachDebugger(HotSpotAgent.java:673)
        at sun.jvm.hotspot.HotSpotAgent.setupDebuggerLinux(HotSpotAgent.java:611)
        at sun.jvm.hotspot.HotSpotAgent.setupDebugger(HotSpotAgent.java:337)
        at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:304)
        at sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:156)
        at sun.jvm.hotspot.tools.Tool.start(Tool.java:191)
        at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
        at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:83)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.tools.jmap.JMap.runTool(JMap.java:201)
        at sun.tools.jmap.JMap.main(JMap.java:130)

root@xxx-30 ~ # java -version
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)