In order to determine liveness, Java has to run full GC, so yes, it does.
To put the question to sleep... here is the answer, if anyone needs to dig deeper. Feel free.
part of /hotspot/agent/src/share/vm/services/attachListener.cpp taken from
openjdk http://download.java.net/openjdk/jdk7/
and you must accept http://www.gnu.org/licenses/gpl-2.0.html
// Implementation of "inspectheap" command
//
// Input arguments :-
// arg0: "-live" or "-all"
static jint heap_inspection(AttachOperation* op, outputStream* out) {
bool live_objects_only = true; // default is true to retain the behavior before this change is made
const char* arg0 = op->arg(0);
if (arg0 != NULL && (strlen(arg0) > 0)) {
if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) {
out->print_cr("Invalid argument to inspectheap operation: %s", arg0);
return JNI_ERR;
}
live_objects_only = strcmp(arg0, "-live") == 0;
}
VM_GC_HeapInspection heapop(out, live_objects_only /* request full gc */, true /* need_prologue */);
VMThread::execute(&heapop);
return JNI_OK;
}
in vmGCOperations.hpp it's the definition
`VM_GC_HeapInspection(outputStream* out, bool request_full_gc,
bool need_prologue) :`
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