JDK 11 中取消了jmap工具 -heap 参数该 jmap 命令行工具打印内存相关统计运行中的VM或核心文件JDK8是正常的如果直接使用jmap -heap 29982，将会得到如下错误：，接下来我们就来聊聊关于jdk8静态变量存储在哪里?以下内容大家不妨参考一二希望能帮到您!
jdk8静态变量存储在哪里
JDK 11 中取消了jmap工具 -heap 参数。该 jmap 命令行工具打印内存相关统计运行中的VM或核心文件。JDK8是正常的。如果直接使用jmap -heap 29982，将会得到如下错误：
[root@VM-0-6-centos ~]# jps -l
26363 jdk.jcmd/sun.tools.jps.Jps
29982 /usr/local/nacos/target/nacos-server.jar
[root@VM-0-6-centos ~]# jmap -heap 29982
Error: -heap option used
Cannot connect to core dump or remote debug server. Use jhsdb jmap instead
需要使用 jhsdb jmap --heap --pid 29982，则可以完整的查看到堆的分配和使用情况。
[root@VM-0-6-centos ~]# jhsdb jmap --heap --pid 29982
Attaching to process ID 29982, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 11.0.5 10-LTS
using thread-local object allocation.
Garbage-First (G1) GC with 4 thread(s)
Heap Configuration:
MinHeapFreeRatio = 40
MaxHeapFreeRatio = 70
MaxHeapSize = 536870912 (512.0MB)
NewSize = 268435456 (256.0MB)
MaxNewSize = 268435456 (256.0MB)
OldSize = 5452592 (5.1999969482421875MB)
NewRatio = 2
SurvivorRatio = 8
MetaspaceSize = 21807104 (20.796875MB)
CompressedClassSpaceSize = 1073741824 (1024.0MB)
MaxMetaspaceSize = 17592186044415 MB
G1HeapRegionSize = 1048576 (1.0MB)
Heap Usage:
G1 Heap:
regions = 512
capacity = 536870912 (512.0MB)
used = 181053824 (172.6663818359375MB)
free = 355817088 (339.3336181640625MB)
33.72390270233154% used
G1 Young Generation:
Eden Space:
regions = 30
capacity = 281018368 (268.0MB)
used = 31457280 (30.0MB)
free = 249561088 (238.0MB)
11.194029850746269% used
Survivor Space:
regions = 1
capacity = 1048576 (1.0MB)
used = 1048576 (1.0MB)
free = 0 (0.0MB)
100.0% used
G1 Old Generation:
regions = 142
capacity = 254803968 (243.0MB)
used = 148547968 (141.6663818359375MB)
free = 106256000 (101.3336181640625MB)
58.29892256622942% used
