running 'jhsdb jmap --binaryheap' will crash w/ NPE if a target JVM is running w/ JFR enabled (-XX:StartFlightRecording=dumponexit=true)
 
Exception in thread "main" java.lang.NullPointerException
	at jdk.hotspot.agent/sun.jvm.hotspot.utilities.HeapHprofBinWriter.writeSymbolID(HeapHprofBinWriter.java:1121)
	at jdk.hotspot.agent/sun.jvm.hotspot.utilities.HeapHprofBinWriter.dumpStackFrame(HeapHprofBinWriter.java:752)
	at jdk.hotspot.agent/sun.jvm.hotspot.utilities.HeapHprofBinWriter.dumpStackTraces(HeapHprofBinWriter.java:725)
	at jdk.hotspot.agent/sun.jvm.hotspot.utilities.HeapHprofBinWriter.write(HeapHprofBinWriter.java:434)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.writeHeapHprofBin(JMap.java:182)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.run(JMap.java:97)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.start(Tool.java:223)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
	at jdk.hotspot.agent/sun.jvm.hotspot.tools.JMap.main(JMap.java:176)
	at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runJMAP(SALauncher.java:326)
	at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:455)