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OpenJDK + jmap - unknown CollectedHeap type : class sun.jvm.hotspot.gc_interface.CollectedHeap
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$ jmap -heap 66 | |
Attaching to process ID 66, please wait... | |
Debugger attached successfully. | |
Server compiler detected. | |
JVM version is 25.111-b14 | |
using parallel threads in the new generation. | |
using thread-local object allocation. | |
Concurrent Mark-Sweep GC | |
Heap Configuration: | |
MinHeapFreeRatio = 40 | |
MaxHeapFreeRatio = 70 | |
MaxHeapSize = 268435456 (256.0MB) | |
NewSize = 87228416 (83.1875MB) | |
MaxNewSize = 87228416 (83.1875MB) | |
OldSize = 181207040 (172.8125MB) | |
NewRatio = 2 | |
SurvivorRatio = 8 | |
MetaspaceSize = 21807104 (20.796875MB) | |
CompressedClassSpaceSize = 1073741824 (1024.0MB) | |
MaxMetaspaceSize = 17592186044415 MB | |
G1HeapRegionSize = 0 (0.0MB) | |
Heap Usage: | |
Exception in thread "main" java.lang.reflect.InvocationTargetException | |
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) | |
Caused by: java.lang.RuntimeException: unknown CollectedHeap type : class sun.jvm.hotspot.gc_interface.CollectedHeap | |
at sun.jvm.hotspot.tools.HeapSummary.run(HeapSummary.java:144) | |
at sun.jvm.hotspot.tools.Tool.startInternal(Tool.java:260) | |
at sun.jvm.hotspot.tools.Tool.start(Tool.java:223) | |
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118) | |
at sun.jvm.hotspot.tools.HeapSummary.main(HeapSummary.java:49) | |
... 6 more |
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On Ubuntu Server 18.04,
apt install openjdk-8-dbg
fixed it for me