一：jps
使用说明：
示例：
[weblogic@hkczjjapp domain9001]$ jps -l
95696 sun.tools.jps.Jps
45908 weblogic.Server
68048 weblogic.Server
二：jstat
使用说明：
示例：
-----查询进程68048的gc情况，250毫秒一次，共5次
[weblogic@hkczjjapp domain9001]$ jstat -gc 68048 250 5
S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT
47488.0 32128.0 0.0 32128.0 373696.0 25461.0 699072.0 84432.1 262144.0 137958.3 17 0.495 3 1.055 1.551
47488.0 32128.0 0.0 32128.0 373696.0 25461.0 699072.0 84432.1 262144.0 137958.3 17 0.495 3 1.055 1.551
47488.0 32128.0 0.0 32128.0 373696.0 25461.0 699072.0 84432.1 262144.0 137958.3 17 0.495 3 1.055 1.551
47488.0 32128.0 0.0 32128.0 373696.0 25461.0 699072.0 84432.1 262144.0 137958.3 17 0.495 3 1.055 1.551
47488.0 32128.0 0.0 32128.0 373696.0 25461.0 699072.0 84432.1 262144.0 137958.3 17 0.495 3 1.055 1.551
三：jmap
说明：
示例：
[weblogic@hkczjjapp domain9001]$ jmap -dump:format=b,file=bb.bin 68048
Dumping heap to /home/weblogic/Oracle/Middleware/user_projects/domains/domain9001/bb.bin ...
Heap dump file created
四：jhat
示例：
------解释jmap生成的dump文件生成网页内容
[weblogic@hkczjjapp domain9001]$ jhat bb.bin
Reading from bb.bin...
Dump file created Fri Nov 22 13:58:24 CST 2019
Snapshot read, resolving...
Resolving 4754263 objects...
WARNING: Failed to resolve object id 0x766506d38 for field constantPoolOop (signature L)
WARNING: Failed to resolve object id 0x766506d38 for field constantPoolOop (signature L)
WARNING: Failed to resolve object id 0x766506d38 for field constantPoolOop (signature L)
Chasing references, expect 950 dots........................................
Eliminating duplicate references..............
Snapshot resolved.
Started HTTP server on port 7000
Server is ready.
五：jstack
说明：
示例：
[weblogic@hkczjjapp domain9001]$ jstack -l 68048
2019-11-22 15:38:30
Full thread dump Java HotSpot(TM) 64-Bit Server VM (20.45-b01 mixed mode):
"Attach Listener" daemon prio=10 tid=0x00007f1448001000 nid=0x13797 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Java2D Disposer" daemon prio=10 tid=0x00007f13fc02f000 nid=0x10b2d in Object.wait() [0x00007f13cdbd6000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x000000078490eae0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <0x000000078490eae0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at sun.java2d.Disposer.run(Disposer.java:127)
at java.lang.Thread.run(Thread.java:662)
Locked ownable synchronizers:
- None
"DynamicListenThread[Default]" daemon prio=10 tid=0x00007f14292d3800 nid=0x10a37 runnable [0x00007f13ce3e2000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:408)
- locked <0x00000007841280e0> (a java.net.SocksSocketImpl)
at java.net.ServerSocket.implAccept(ServerSocket.java:462)
at java.net.ServerSocket.accept(ServerSocket.java:430)
at weblogic.socket.WeblogicServerSocket.accept(WeblogicServerSocket.java:38)
at weblogic.server.channels.DynamicListenThread$SocketAccepter.accept(DynamicListenThread.java:535)
at weblogic.server.channels.DynamicListenThread$SocketAccepter.access$200(DynamicListenThread.java:417)
at weblogic.server.channels.DynamicListenThread.run(DynamicListenThread.java:173)
at java.lang.Thread.run(Thread.java:662)
Locked ownable synchronizers:
- None