定位线上问题时，知识和经验是关键基础，数据是依据，数据包括运行日志，异常堆栈，GC日志，线程快照(threaddump/javacore文件)，堆转储快照(headdump/hprof文件)等
JDK监控和故障处理工具
| 命令 | 作用 |
|---|---|
| jps | 显示指定系统内所有HotSpot虚拟机进程 |
| jstat | 收集HotSpot虚拟机各方面运行数据 |
| jinfo | 显示虚拟机配置信息 |
| jmap | 生成虚拟机的内部转储快照(heapdump文件) |
| jhat | 分析heapdump文件 |
| jstack | 显示虚拟机线程快照 |
jps：虚拟机进程状况工具
显示指定系统内所有HotSpot虚拟机进程
常用选项
| 选项 | 作用 |
|---|---|
| -q | 只输出LVMID |
| -m | 输出虚拟机启动时传递给主类main函数的参数 |
| -l | 输出主类全名 |
| -v | 显示虚拟机启动时的JVM参数 |
[oracle@wcdev ~]$ jps
20560 Server
24748 Rcu
17387 Server
14824 Jps
20635 Server
27844 Server
10658 Server
5713 Server
10738 Server
6594 NodeManager
10705 Server
29681 Server
[oracle@wcdev ~]$ jstat：虚拟机统计信息监视工具
收集HotSpot虚拟机各方面运行数据
常用选项
| 选项 | 作用 |
|---|---|
| -class | 监视类装载，卸载数量，总空间以及类装载所耗费的时间 |
| -gc | 监视JAVA堆状况，包括Eden区，两个survivor区，老年代，永久代等 |
查询进程20560的信息，1000毫秒一次，执行10次
[oracle@wcdev ~]$ jstat -gc 20560 1000 10
HeapSize NurserySize UsedHeapSize YC OC YCTime OCTime GCTime YCPauseTime OCPauseTime PauseTime
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
4194304.0 1528649.8 1132960.1 2735 501 309.990 173.831 483.821 310.056 173.843 483.899
[oracle@wcdev ~]$ jinfo：JAVA配置信息工具
jinfo可以查看和调整虚拟机各项参数，使用 jinfo 可以在不重启虚拟机的情况下，可以动态的修改 jvm 的参数
常用选项
| 选项 | 作用 |
|---|---|
| -flag | 输出对应名称的参数 |
| -flag [+/-]name | 开启或者关闭对应名称的参数 |
jinfo pid
C:\Users\zero>jps -l
12080 com.example.offer.leecode.t20201015.CanJump
16112 sun.tools.jps.Jps
6292 org.jetbrains.idea.maven.server.RemoteMavenServer36
12940 org.jetbrains.kotlin.daemon.KotlinCompileDaemon
16284 org.jetbrains.jps.cmdline.Launcher
17388
C:\Users\zero>jinfo 12080
Attaching to process ID 12080, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.102-b14
Java System Properties:
java.runtime.name = Java(TM) SE Runtime Environment
java.vm.version = 25.102-b14
sun.boot.library.path = C:\Program Files\Java\Java1.8.1\jre\bin
java.vendor.url = http://java.oracle.com/
java.vm.vendor = Oracle Corporation
path.separator = ;
file.encoding.pkg = sun.io
java.vm.name = Java HotSpot(TM) 64-Bit Server VM
sun.os.patch.level =
sun.java.launcher = SUN_STANDARD
user.script =
user.country = CN
user.dir = F:\GitCode\zero\TestExcel
java.vm.specification.name = Java Virtual Machine Specification
java.runtime.version = 1.8.0_102-b14
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
os.arch = amd64
java.endorsed.dirs = C:\Program Files\Java\Java1.8.1\jre\lib\endorsed
line.separator =
java.io.tmpdir = C:\Users\zero\AppData\Local\Temp\
java.vm.specification.vendor = Oracle Corporation
user.variant =
os.name = Windows 10
sun.jnu.encoding = GBK
java.library.path = C:\Program Files\Java\Java1.8.1\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;F:\oracleExe\app\oracle\product\11.2.0\server\bin;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Java\Java1.8.1\bin;C:\Program Files\TortoiseSVN\bin;F:\APP;F:\Git\Git\cmd;C:\Program Files\Redis\;F:\NvmFolder\nvm;F:\NvmFolder\nodejs;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;F:\Microsoft VS Code\Microsoft VS Code\bin;F:\Idea\IntelliJ IDEA 2017.1.1\plugins\maven\lib\maven3\bin;C:\Program Files\gradle\gradle-4.6\bin;F:\NvmFolder\nvm;F:\NvmFolder\nodejs;C:\Users\zero\AppData\Local\BypassRuntm;F:\NvmFolder\nvm;F:\NvmFolder\nodejs;F:\JetBrains\IntelliJ IDEA 2019.2.1\plugins\maven\lib\maven3\bin;.
java.specification.name = Java Platform API Specification
java.class.version = 52.0
sun.management.compiler = HotSpot 64-Bit Tiered Compilers
os.version = 10.0
user.home = C:\Users\zero
user.timezone = Asia/Shanghai
java.awt.printerjob = sun.awt.windows.WPrinterJob
file.encoding = UTF-8
java.specification.version = 1.8
user.name = zero
java.class.path = C:\Program Files\Java\Java1.8.1\jre\lib\charsets.jar;C:\Program Files\Java\Java1.8.1\jre\lib\deploy.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\dnsns.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\jaccess.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\localedata.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\nashorn.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\sunec.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\Java1.8.1\jre\lib\ext\zipfs.jar;C:\Program Files\Java\Java1.8.1\jre\lib\javaws.jar;C:\Program Files\Java\Java1.8.1\jre\lib\jce.jar;C:\Program Files\Java\Java1.8.1\jre\lib\jfr.jar;C:\Program Files\Java\Java1.8.1\jre\lib\jfxswt.jar;C:\Program Files\Java\Java1.8.1\jre\lib\jsse.jar;C:\Program Files\Java\Java1.8.1\jre\lib\management-agent.jar;C:\Program Files\Java\Java1.8.1\jre\lib\plugin.jar;C:\Program Files\Java\Java1.8.1\jre\lib\resources.jar;C:\Program Files\Java\Java1.8.1\jre\lib\rt.jar;F:\Jclasslib\jclasslib\jclasslib\bin\jclasslib.jar;F:\GitCode\zero\TestExcel\target\classes;F:\workSpace\Maven\repository\org\springframework\boot\spring-boot-starter-web\2.2.6.RELEASE\spring-boot-starter-web-2.2.6.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\boot\spring-boot-starter\2.2.6.RELEASE\spring-boot-starter-2.2.6.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\boot\spring-boot\2.2.6.RELEASE\spring-boot-2.2.6.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\boot\spring-boot-autoconfigure\2.2.6.RELEASE\spring-boot-autoconfigure-2.2.6.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\boot\spring-boot-starter-logging\2.2.6.RELEASE\spring-boot-starter-logging-2.2.6.RELEASE.jar;F:\workSpace\Maven\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;F:\workSpace\Maven\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;F:\workSpace\Maven\repository\org\slf4j\slf4j-api\1.7.30\slf4j-api-1.7.30.jar;F:\workSpace\Maven\repository\org\apache\logging\log4j\log4j-to-slf4j\2.12.1\log4j-to-slf4j-2.12.1.jar;F:\workSpace\Maven\repository\org\apache\logging\log4j\log4j-api\2.12.1\log4j-api-2.12.1.jar;F:\workSpace\Maven\repository\org\slf4j\jul-to-slf4j\1.7.30\jul-to-slf4j-1.7.30.jar;F:\workSpace\Maven\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;F:\workSpace\Maven\repository\org\springframework\spring-core\5.2.5.RELEASE\spring-core-5.2.5.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\spring-jcl\5.2.5.RELEASE\spring-jcl-5.2.5.RELEASE.jar;F:\workSpace\Maven\repository\org\yaml\snakeyaml\1.25\snakeyaml-1.25.jar;F:\workSpace\Maven\repository\org\springframework\boot\spring-boot-starter-json\2.2.6.RELEASE\spring-boot-starter-json-2.2.6.RELEASE.jar;F:\workSpace\Maven\repository\com\fasterxml\jackson\core\jackson-databind\2.10.3\jackson-databind-2.10.3.jar;F:\workSpace\Maven\repository\com\fasterxml\jackson\core\jackson-annotations\2.10.3\jackson-annotations-2.10.3.jar;F:\workSpace\Maven\repository\com\fasterxml\jackson\core\jackson-core\2.10.3\jackson-core-2.10.3.jar;F:\workSpace\Maven\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.10.3\jackson-datatype-jdk8-2.10.3.jar;F:\workSpace\Maven\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.10.3\jackson-datatype-jsr310-2.10.3.jar;F:\workSpace\Maven\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.10.3\jackson-module-parameter-names-2.10.3.jar;F:\workSpace\Maven\repository\org\springframework\boot\spring-boot-starter-tomcat\2.2.6.RELEASE\spring-boot-starter-tomcat-2.2.6.RELEASE.jar;F:\workSpace\Maven\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.33\tomcat-embed-core-9.0.33.jar;F:\workSpace\Maven\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.33\tomcat-embed-el-9.0.33.jar;F:\workSpace\Maven\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.33\tomcat-embed-websocket-9.0.33.jar;F:\workSpace\Maven\repository\org\springframework\boot\spring-boot-starter-validation\2.2.6.RELEASE\spring-boot-starter-validation-2.2.6.RELEASE.jar;F:\workSpace\Maven\repository\jakarta\validation\jakarta.validation-api\2.0.2\jakarta.validation-api-2.0.2.jar;F:\workSpace\Maven\repository\org\hibernate\validator\hibernate-validator\6.0.18.Final\hibernate-validator-6.0.18.Final.jar;F:\workSpace\Maven\repository\org\jboss\logging\jboss-logging\3.4.1.Final\jboss-logging-3.4.1.Final.jar;F:\workSpace\Maven\repository\com\fasterxml\classmate\1.5.1\classmate-1.5.1.jar;F:\workSpace\Maven\repository\org\springframework\spring-web\5.2.5.RELEASE\spring-web-5.2.5.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\spring-beans\5.2.5.RELEASE\spring-beans-5.2.5.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\spring-webmvc\5.2.5.RELEASE\spring-webmvc-5.2.5.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\spring-aop\5.2.5.RELEASE\spring-aop-5.2.5.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\spring-context\5.2.5.RELEASE\spring-context-5.2.5.RELEASE.jar;F:\workSpace\Maven\repository\org\springframework\spring-expression\5.2.5.RELEASE\spring-expression-5.2.5.RELEASE.jar;F:\workSpace\Maven\repository\org\apache\poi\poi-ooxml\3.10-FINAL\poi-ooxml-3.10-FINAL.jar;F:\workSpace\Maven\repository\org\apache\poi\poi\3.10-FINAL\poi-3.10-FINAL.jar;F:\workSpace\Maven\repository\commons-codec\commons-codec\1.13\commons-codec-1.13.jar;F:\workSpace\Maven\repository\dom4j\dom4j\1.6.1\dom4j-1.6.1.jar;F:\workSpace\Maven\repository\xml-apis\xml-apis\1.0.b2\xml-apis-1.0.b2.jar;F:\workSpace\Maven\repository\org\apache\poi\poi-ooxml-schemas\3.10-FINAL\poi-ooxml-schemas-3.10-FINAL.jar;F:\workSpace\Maven\repository\org\apache\xmlbeans\xmlbeans\2.3.0\xmlbeans-2.3.0.jar;F:\workSpace\Maven\repository\stax\stax-api\1.0.1\stax-api-1.0.1.jar;F:\workSpace\Maven\repository\com\alibaba\fastjson\1.2.53\fastjson-1.2.53.jar;F:\workSpace\Maven\repository\com\rabbitmq\amqp-client\3.4.1\amqp-client-3.4.1.jar;F:\workSpace\Maven\repository\org\json\json\20140107\json-20140107.jar;F:\workSpace\Maven\repository\junit\junit\4.12\junit-4.12.jar;F:\workSpace\Maven\repository\org\hamcrest\hamcrest-core\2.1\hamcrest-core-2.1.jar;F:\workSpace\Maven\repository\org\hamcrest\hamcrest\2.1\hamcrest-2.1.jar;F:\workSpace\Maven\repository\io\netty\netty-all\4.1.20.Final\netty-all-4.1.20.Final.jar;F:\workSpace\Maven\repository\org\msgpack\msgpack\0.6.12\msgpack-0.6.12.jar;F:\workSpace\Maven\repository\com\googlecode\json-simple\json-simple\1.1.1\json-simple-1.1.1.jar;F:\workSpace\Maven\repository\org\javassist\javassist\3.18.1-GA\javassist-3.18.1-GA.jar;F:\JetBrains\IntelliJ IDEA 2019.2.1\lib\idea_rt.jar
java.vm.specification.version = 1.8
sun.arch.data.model = 64
sun.java.command = com.example.offer.leecode.t20201015.CanJump
java.home = C:\Program Files\Java\Java1.8.1\jre
user.language = zh
java.specification.vendor = Oracle Corporation
awt.toolkit = sun.awt.windows.WToolkit
java.vm.info = mixed mode
java.version = 1.8.0_102
java.ext.dirs = C:\Program Files\Java\Java1.8.1\jre\lib\ext;C:\Windows\Sun\Java\lib\ext
sun.boot.class.path = C:\Program Files\Java\Java1.8.1\jre\lib\resources.jar;C:\Program Files\Java\Java1.8.1\jre\lib\rt.jar;C:\Program Files\Java\Java1.8.1\jre\lib\sunrsasign.jar;C:\Program Files\Java\Java1.8.1\jre\lib\jsse.jar;C:\Program Files\Java\Java1.8.1\jre\lib\jce.jar;C:\Program Files\Java\Java1.8.1\jre\lib\charsets.jar;C:\Program Files\Java\Java1.8.1\jre\lib\jfr.jar;C:\Program Files\Java\Java1.8.1\jre\classes
java.vendor = Oracle Corporation
file.separator = \
java.vendor.url.bug = http://bugreport.sun.com/bugreport/
sun.io.unicode.encoding = UnicodeLittle
sun.cpu.endian = little
sun.desktop = windows
sun.cpu.isalist = amd64
VM Flags:
Non-default VM flags: -XX:CICompilerCount=4 -XX:InitialHeapSize=268435456 -XX:MaxHeapSize=4273995776 -XX:MaxNewSize=1424490496 -XX:MinHeapDeltaBytes=524288 -XX:NewSize=89128960 -XX:OldSize=179306496 -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseFastUnorderedTimeStamps -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC
Command line: -javaagent:F:\JetBrains\IntelliJ IDEA 2019.2.1\lib\idea_rt.jar=55312:F:\JetBrains\IntelliJ IDEA 2019.2.1\bin -Dfile.encoding=UTF-8
C:\Users\zero>jinfo -flag name pid
查看指定JVM参数的值
C:\Users\zero>jinfo -flag InitialHeapSize 6880
-XX:InitialHeapSize=268435456jinfo -flag [+|-]name pid
动态修改JVM参数的值
C:\Users\zero>jinfo -flag +PrintGC 8932
C:\Users\zero>jinfo -flag PrintGC 8932
-XX:+PrintGC
C:\Users\zero>jinfo -flag -PrintGC 8932
C:\Users\zero>jinfo -flag PrintGC 8932
-XX:-PrintGC
C:\Users\zero>jmap：JAVA内存映像工具
jmap用于生成堆转储快照(heapdump或dump文件)
生成dump文件的方法，设置虚拟机参数，让虚拟机在OOM异常后自动生成dump文件，或者kill -3 dip，或者使用jmap获取，但是使用jmap命令会造成服务器停用，影响可能会很严重
#出现 OOME 时生成堆 dump:
-XX:+HeapDumpOnOutOfMemoryError
#生成堆文件地址：
-XX:HeapDumpPath=/home/liuke/jvmlogs/常用选项
| 选项 | 作用 |
|---|---|
| -dump | 生成JAVA堆转储快照 |
| -heap | 显示JAVA堆详细信息 |
使用jmap生成dump文件
C:\Users\zero>jmap -dump:format=b,file=work 5892
Dumping heap to C:\Users\zero\work ...
Heap dump file created危险操作
最主要的危险操作是下面这三种：
- jmap -dump
这个命令执行，JVM会将整个heap的信息dump写入到一个文件，heap如果比较大的话，就会导致这个过程比较耗时，并且执行的过程中为了保证dump的信息是可靠的，所以会暂停应用。 - jmap -permstat
这个命令执行，JVM会去统计perm区的状况，这整个过程也会比较的耗时，并且同样也会暂停应用。 - jmap -histo:live
这个命令执行，JVM会先触发gc，然后再统计信息。
jstack：JAVA堆栈跟踪工具
jstack命令用于生成虚拟机当前时刻的线程快照(threaddump或者javacore文件)
常用选项
| 选项 | 作用 |
|---|---|
| -l | 除堆栈外，显示有关锁的附加信息 |
| -m | 调用本地方法的话，可以显示C/C++的堆栈 |
使用jstack查看线程堆栈
C:\Users\zero>jstack 14024
2020-10-21 22:06:55
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.102-b14 mixed mode):
"Service Thread" #11 daemon prio=9 os_prio=0 tid=0x000000001f982800 nid=0x3c2c runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C1 CompilerThread3" #10 daemon prio=9 os_prio=2 tid=0x000000001f0e9800 nid=0x604 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread2" #9 daemon prio=9 os_prio=2 tid=0x000000001f0e4800 nid=0x3b24 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread1" #8 daemon prio=9 os_prio=2 tid=0x000000001f0e4000 nid=0x32fc waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" #7 daemon prio=9 os_prio=2 tid=0x000000001f0dd000 nid=0x428 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Monitor Ctrl-Break" #6 daemon prio=5 os_prio=0 tid=0x000000001f081000 nid=0x2c08 runnable [0x000000001f55e000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:170)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
- locked <0x000000076b44f888> (a java.io.InputStreamReader)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:161)
at java.io.BufferedReader.readLine(BufferedReader.java:324)
- locked <0x000000076b44f888> (a java.io.InputStreamReader)
at java.io.BufferedReader.readLine(BufferedReader.java:389)
at com.intellij.rt.execution.application.AppMainV2$1.run(AppMainV2.java:64)
"Attach Listener" #5 daemon prio=5 os_prio=2 tid=0x000000001edf1800 nid=0x10c4 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" #4 daemon prio=9 os_prio=2 tid=0x000000001ed9d000 nid=0x1d14 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" #3 daemon prio=8 os_prio=1 tid=0x000000001ed80800 nid=0x3c38 in Object.wait() [0x000000001f25f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x000000076b188e98> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x000000076b188e98> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)
"Reference Handler" #2 daemon prio=10 os_prio=2 tid=0x000000000340c000 nid=0x3500 in Object.wait() [0x000000001ed5f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x000000076b186b40> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x000000076b186b40> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
"main" #1 prio=5 os_prio=0 tid=0x0000000003314800 nid=0x3fa8 waiting on condition [0x000000000309f000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at com.example.offer.leecode.t20201015.CanJump.main(CanJump.java:57)
"VM Thread" os_prio=2 tid=0x000000001ce69800 nid=0x1f18 runnable
"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x000000000332a800 nid=0x2b64 runnable
"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x000000000332c000 nid=0x514 runnable
"GC task thread#2 (ParallelGC)" os_prio=0 tid=0x000000000332e000 nid=0x19f8 runnable
"GC task thread#3 (ParallelGC)" os_prio=0 tid=0x0000000003330800 nid=0x2608 runnable
"GC task thread#4 (ParallelGC)" os_prio=0 tid=0x0000000003332800 nid=0x2c84 runnable
"GC task thread#5 (ParallelGC)" os_prio=0 tid=0x0000000003333800 nid=0x406c runnable
"GC task thread#6 (ParallelGC)" os_prio=0 tid=0x0000000003337000 nid=0x2c38 runnable
"GC task thread#7 (ParallelGC)" os_prio=0 tid=0x0000000003338000 nid=0x2c54 runnable
"VM Periodic Task Thread" os_prio=2 tid=0x000000001fa2c000 nid=0x21d4 waiting on condition
JNI global references: 33
C:\Users\zero>jstack -l 14024
2020-10-21 22:07:00
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.102-b14 mixed mode):
"Service Thread" #11 daemon prio=9 os_prio=0 tid=0x000000001f982800 nid=0x3c2c runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"C1 CompilerThread3" #10 daemon prio=9 os_prio=2 tid=0x000000001f0e9800 nid=0x604 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"C2 CompilerThread2" #9 daemon prio=9 os_prio=2 tid=0x000000001f0e4800 nid=0x3b24 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"C2 CompilerThread1" #8 daemon prio=9 os_prio=2 tid=0x000000001f0e4000 nid=0x32fc waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"C2 CompilerThread0" #7 daemon prio=9 os_prio=2 tid=0x000000001f0dd000 nid=0x428 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Monitor Ctrl-Break" #6 daemon prio=5 os_prio=0 tid=0x000000001f081000 nid=0x2c08 runnable [0x000000001f55e000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:170)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
- locked <0x000000076b44f888> (a java.io.InputStreamReader)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:161)
at java.io.BufferedReader.readLine(BufferedReader.java:324)
- locked <0x000000076b44f888> (a java.io.InputStreamReader)
at java.io.BufferedReader.readLine(BufferedReader.java:389)
at com.intellij.rt.execution.application.AppMainV2$1.run(AppMainV2.java:64)
Locked ownable synchronizers:
- None
"Attach Listener" #5 daemon prio=5 os_prio=2 tid=0x000000001edf1800 nid=0x10c4 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Signal Dispatcher" #4 daemon prio=9 os_prio=2 tid=0x000000001ed9d000 nid=0x1d14 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Finalizer" #3 daemon prio=8 os_prio=1 tid=0x000000001ed80800 nid=0x3c38 in Object.wait() [0x000000001f25f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x000000076b188e98> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x000000076b188e98> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)
Locked ownable synchronizers:
- None
"Reference Handler" #2 daemon prio=10 os_prio=2 tid=0x000000000340c000 nid=0x3500 in Object.wait() [0x000000001ed5f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x000000076b186b40> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x000000076b186b40> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
Locked ownable synchronizers:
- None
"main" #1 prio=5 os_prio=0 tid=0x0000000003314800 nid=0x3fa8 waiting on condition [0x000000000309f000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at com.example.offer.leecode.t20201015.CanJump.main(CanJump.java:57)
Locked ownable synchronizers:
- None
"VM Thread" os_prio=2 tid=0x000000001ce69800 nid=0x1f18 runnable
"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x000000000332a800 nid=0x2b64 runnable
"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x000000000332c000 nid=0x514 runnable
"GC task thread#2 (ParallelGC)" os_prio=0 tid=0x000000000332e000 nid=0x19f8 runnable
"GC task thread#3 (ParallelGC)" os_prio=0 tid=0x0000000003330800 nid=0x2608 runnable
"GC task thread#4 (ParallelGC)" os_prio=0 tid=0x0000000003332800 nid=0x2c84 runnable
"GC task thread#5 (ParallelGC)" os_prio=0 tid=0x0000000003333800 nid=0x406c runnable
"GC task thread#6 (ParallelGC)" os_prio=0 tid=0x0000000003337000 nid=0x2c38 runnable
"GC task thread#7 (ParallelGC)" os_prio=0 tid=0x0000000003338000 nid=0x2c54 runnable
"VM Periodic Task Thread" os_prio=2 tid=0x000000001fa2c000 nid=0x21d4 waiting on condition
JNI global references: 33
C:\Users\zero>jstack -m 14024
Attaching to process ID 14024, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.102-b14
Deadlock Detection:
No deadlocks found.
----------------- 0 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
0xec8b485741564155 ????????
sun.jvm.hotspot.debugger.DebuggerException: Windbg Error: ReadVirtual failed!
at sun.jvm.hotspot.debugger.windbg.WindbgDebuggerLocal.readBytesFromProcess0(Native Method)
at sun.jvm.hotspot.debugger.windbg.WindbgDebuggerLocal.readBytesFromProcess(WindbgDebuggerLocal.java:490)
at sun.jvm.hotspot.debugger.DebuggerBase$Fetcher.fetchPage(DebuggerBase.java:80)
at sun.jvm.hotspot.debugger.PageCache.getPage(PageCache.java:178)
at sun.jvm.hotspot.debugger.PageCache.getLong(PageCache.java:100)
at sun.jvm.hotspot.debugger.DebuggerBase.readCInteger(DebuggerBase.java:364)
at sun.jvm.hotspot.debugger.DebuggerBase.readAddressValue(DebuggerBase.java:462)
at sun.jvm.hotspot.debugger.windbg.WindbgDebuggerLocal.readAddress(WindbgDebuggerLocal.java:316)
at sun.jvm.hotspot.debugger.windbg.WindbgAddress.getAddressAt(WindbgAddress.java:72)
at sun.jvm.hotspot.debugger.windows.amd64.WindowsAMD64CFrame.sender(WindowsAMD64CFrame.java:60)
at sun.jvm.hotspot.tools.PStack.run(PStack.java:161)
at sun.jvm.hotspot.tools.PStack.run(PStack.java:58)
at sun.jvm.hotspot.tools.PStack.run(PStack.java:53)
at sun.jvm.hotspot.tools.JStack.run(JStack.java:66)
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.JStack.main(JStack.java:92)
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.jstack.JStack.runJStackTool(JStack.java:140)
at sun.tools.jstack.JStack.main(JStack.java:106)
----------------- 1 -----------------
----------------- 2 -----------------
----------------- 3 -----------------
0x00007ffb6fa55c24 ntdll!NtWaitForMultipleObjects + 0x14
----------------- 4 -----------------
----------------- 5 -----------------
----------------- 6 -----------------
----------------- 7 -----------------
----------------- 8 -----------------
----------------- 9 -----------------
----------------- 10 -----------------
----------------- 11 -----------------
----------------- 12 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 13 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 14 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 15 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 16 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 17 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 18 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 19 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 20 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 21 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14
----------------- 22 -----------------
----------------- 23 -----------------
0x00007ffb6fa55154 ntdll!ZwWaitForSingleObject + 0x14