一、Javac(java compiler)

1、功能:javac是一种前端编译器,负责将源代码转换为字节码。

2、例子

(1)代码

public class TestJavac {
static class Person{
private String name;
private Integer age;
public Person() {
} public Person(String name, Integer age) {
this.name = name;
this.age = age;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public Integer getAge() {
return age;
} public void setAge(Integer age) {
this.age = age;
}
} public static void main(String[] args) {
System.out.println("Test Javac");
Person javac = new Person("Javac", 14);
System.out.println(javac.getName());
System.out.println(javac.getAge());
}
}

(2)执行javac命令

C:\Users\HBKJ\Desktop\TestJavac>javac TestJavac.java
C:\Users\HBKJ\Desktop\TestJavac>dir
C:\Users\HBKJ\Desktop\TestJavac 的目录
2018/07/21 12:30 <DIR> .
2018/07/21 12:30 <DIR> ..
2018/07/21 12:26 774 TestJavac$Person.class // 内部类
2018/07/21 12:26 783 TestJavac.class
2018/07/21 12:26 842 TestJavac.java
3 个文件 2,399 字节
2 个目录 13,931,593,728 可用字节

二、javap

1、功能:javap是Java字节码文件分解器,能够反编译javac生成的字节码;也能够查看java编译器生成的字节码,用于分解class文件。

2、例子

(1)命令:javap -p

C:\Users\HBKJ\Desktop\TestJavac>javap -p TestJavac.class
Compiled from "TestJavac.java"
public class TestJavac {
public TestJavac();
public static void main(java.lang.String[]);
}

(2)命令:javap -c

C:\Users\HBKJ\Desktop\TestJavac>javap -c TestJavac.class
Compiled from "TestJavac.java"
public class TestJavac {
public TestJavac(); // 构造器
Code:
0: aload_0
1: invokespecial #1 // Method java/lang/Object."<init>":()V
4: return public static void main(java.lang.String[]);
Code:
0: getstatic #2 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #3 // String Test Javac
5: invokevirtual #4 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: new #5 // class TestJavac$Person
11: dup
12: ldc #6 // String Javac
14: bipush 14
16: invokestatic #7 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
19: invokespecial #8 // Method TestJavac$Person."<init>":(Ljava/lang/String;Ljava/lang/Integer;)V
22: astore_1
23: getstatic #2 // Field java/lang/System.out:Ljava/io/PrintStream;
26: aload_1
27: invokevirtual #9 // Method TestJavac$Person.getName:()Ljava/lang/String;
30: invokevirtual #4 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
33: getstatic #2 // Field java/lang/System.out:Ljava/io/PrintStream;
36: aload_1
37: invokevirtual #10 // Method TestJavac$Person.getAge:()Ljava/lang/Integer;
40: invokevirtual #11 // Method java/io/PrintStream.println:(Ljava/lang/Object;)V
43: return
}

三、jps(JVM Process Status Tool)

1、功能:列出正在运行的虚拟机进程,并显示虚拟机执行主类的名称和这些进程的唯一ID。

2、主要选项

选项 作用
-q 省略主类名称(java8默认参数)
-l 输出主类名称(java10默认参数)
-v 输出虚拟机进程启动时JVM参数

3、例子(Idea IDE进程)

PS C:\Windows\system32> jps
9024 Jps
9796 Launcher
9860 PS C:\Windows\system32> jps -l
9796 org.jetbrains.jps.cmdline.Launcher
9860
8540 jdk.jcmd/sun.tools.jps.Jps PS C:\Windows\system32> jps -v
8404 Jps -Dapplication.home=E:\develop\software\java10\jdk -Xms8m -Djdk.module.main=jdk.jcmd
9796 Launcher -Xmx700m -Djava.awt.headless=true -Djdt.compiler.useSingleThread=true -Dpreload.project.path=E:/develop/project/AlgorithmsLearning -Dpreload.config.path=C:/Users/HBKJ/.IntelliJIdea2018.1/config/options -Dcompile.parallel=false -Drebuild.on.dependency.change=true -Djava.net.preferIPv4Stack=true -Dio.netty.initialSeedUniquifier=7903075717686063478 -Dfile.encoding=GBK -Duser.language=zh -Duser.country=CN -Didea.paths.selector=IntelliJIdea2018.1 -Didea.home.path=D:\software\IntelliJ IDEA 2018.1.1 -Didea.config.path=C:\Users\HBKJ\.IntelliJIdea2018.1\config -Didea.plugins.path=C:\Users\HBKJ\.IntelliJIdea2018.1\config\plugins -Djps.log.dir=C:/Users/HBKJ/.IntelliJIdea2018.1/system/log/build-log -Djps.fallback.jdk.home=D:/software/IntelliJ IDEA 2018.1.1/jre64 -Djps.fallback.jdk.version=1.8.0_152-release -Dio.netty.noUnsafe=true -Djava.io.tmpdir=C:/Users/HBKJ/.IntelliJIdea2018.1/system/compile-server/algorithmslearning_af8be974/_temp_ -Djps.backward.ref.index.builder=true -Dkotlin.incremental.compilation=true -Dkotlin.
9860 -Xms128m -Xmx750m -XX:ReservedCodeCacheSize=240m -XX:+UseConcMarkSweepGC -XX:SoftRefLRUPolicyMSPerMB=50 -ea -Dsun.io.useCanonCaches=false -Djava.net.preferIPv4Stack=true -XX:+HeapDumpOnOutOfMemoryError -XX:-OmitStackTraceInFastThrow -javaagent:D:/software/IntelliJ IDEA 2018.1.1/bin/JetbrainsCrack-2.7-release-str.jar -Djb.vmOptionsFile=D:\software\IntelliJ IDEA 2018.1.1\bin\idea64.exe.vmoptions -Didea.jre.check=true -Dide.native.launcher=true -Didea.paths.selector=IntelliJIdea2018.1 -XX:ErrorFile=C:\Users\HBKJ\java_error_in_idea_%p.log -XX:HeapDumpPath=C:\Users\HBKJ\java_error_in_idea.hprof

四、jstack(Stack Trace for java)

1、功能:生成JVM当前时间的线程快照(threaddump或javacore文件)。

  • 线程快照:当前JVM内每一条线程正在执行的方法堆栈的集合,生成线程快照的主要目的是为了定位线程长时间停顿的原因。
  • 线程长时间停顿情况:死锁、死循环、请求外部资源等

2、主要选项

选项 作用
-l 同时显示锁的附加信息

3、例子(Idea IDE进程)

PS C:\Users\HBKJ> jstack 9796
2018-07-14 14:33:38
Full thread dump Java HotSpot(TM) 64-Bit Server VM (10.0.1+10 mixed mode): Threads class SMR info:
_java_thread_list=0x000001a3b0b585f0, length=14, elements={
0x000001a3aea36000, 0x000001a3aea37000, 0x000001a3aea3d800, 0x000001a3aea3e000,
0x000001a3af2c8800, 0x000001a3af2d1000, 0x000001a3af2d4000, 0x000001a3af2d8000,
0x000001a3af2e8800, 0x000001a3af47f800, 0x000001a3af484000, 0x000001a3afb2f000,
0x000001a38ff10000, 0x000001a3b0cb0800
} "Reference Handler" #2 daemon prio=10 os_prio=2 tid=0x000001a3aea36000 nid=0x1e44 waiting on condition [0x0000008ea28ff000]
java.lang.Thread.State: RUNNABLE
at java.lang.ref.Reference.waitForReferencePendingList(java.base@10.0.1/Native Method)
at java.lang.ref.Reference.processPendingReferences(java.base@10.0.1/Reference.java:174)
at java.lang.ref.Reference.access$000(java.base@10.0.1/Reference.java:44)
at java.lang.ref.Reference$ReferenceHandler.run(java.base@10.0.1/Reference.java:138) "Finalizer" #3 daemon prio=8 os_prio=1 tid=0x000001a3aea37000 nid=0x1308 in Object.wait() [0x0000008ea29fe000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@10.0.1/Native Method)
- waiting on <0x00000000d4e5e9c0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@10.0.1/ReferenceQueue.java:151)
- waiting to re-lock in wait() <0x00000000d4e5e9c0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@10.0.1/ReferenceQueue.java:172)
at java.lang.ref.Finalizer$FinalizerThread.run(java.base@10.0.1/Finalizer.java:216) "Signal Dispatcher" #4 daemon prio=9 os_prio=2 tid=0x000001a3aea3d800 nid=0x196c runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE "Attach Listener" #5 daemon prio=5 os_prio=2 tid=0x000001a3aea3e000 nid=0x3210 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE "C2 CompilerThread0" #6 daemon prio=9 os_prio=2 tid=0x000001a3af2c8800 nid=0xe08 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task "C2 CompilerThread1" #7 daemon prio=9 os_prio=2 tid=0x000001a3af2d1000 nid=0x2a94 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task "C2 CompilerThread2" #8 daemon prio=9 os_prio=2 tid=0x000001a3af2d4000 nid=0x724 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task "C1 CompilerThread3" #9 daemon prio=9 os_prio=2 tid=0x000001a3af2d8000 nid=0x20 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task "Sweeper thread" #10 daemon prio=9 os_prio=2 tid=0x000001a3af2e8800 nid=0x2810 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE "Service Thread" #11 daemon prio=9 os_prio=0 tid=0x000001a3af47f800 nid=0x23a8 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE "Common-Cleaner" #12 daemon prio=8 os_prio=1 tid=0x000001a3af484000 nid=0x29b0 in Object.wait() [0x0000008ea33ff000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(java.base@10.0.1/Native Method)
- waiting on <0x00000000d4e213d8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@10.0.1/ReferenceQueue.java:151)
- waiting to re-lock in wait() <0x00000000d4e213d8> (a java.lang.ref.ReferenceQueue$Lock)
at jdk.internal.ref.CleanerImpl.run(java.base@10.0.1/CleanerImpl.java:148)
at java.lang.Thread.run(java.base@10.0.1/Thread.java:844)
at jdk.internal.misc.InnocuousThread.run(java.base@10.0.1/InnocuousThread.java:134) "JPS event loop" #13 prio=5 os_prio=0 tid=0x000001a3afb2f000 nid=0x1674 runnable [0x0000008ea45fe000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(java.base@10.0.1/Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(java.base@10.0.1/WindowsSelectorImpl.java:296)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(java.base@10.0.1/WindowsSelectorImpl.java:278)
at sun.nio.ch.WindowsSelectorImpl.doSelect(java.base@10.0.1/WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(java.base@10.0.1/SelectorImpl.java:89)
- locked <0x00000000d4e620c8> (a io.netty.channel.nio.SelectedSelectionKeySet)
- locked <0x00000000d4e620e0> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000000d4e62048> (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(java.base@10.0.1/SelectorImpl.java:100)
at io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:752)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:408)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
at java.lang.Thread.run(java.base@10.0.1/Thread.java:844) "DestroyJavaVM" #15 prio=5 os_prio=0 tid=0x000001a38ff10000 nid=0x2278 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE "NettythreadDeathWatcher-2-1" #17 daemon prio=1 os_prio=-2 tid=0x000001a3b0cb0800 nid=0x2740 waiting on condition [0x0000008ea48fe000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(java.base@10.0.1/Native Method)
at io.netty.util.ThreadDeathWatcher$Watcher.run(ThreadDeathWatcher.java:152)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
at java.lang.Thread.run(java.base@10.0.1/Thread.java:844) "VM Thread" os_prio=2 tid=0x000001a3aea31800 nid=0x1de0 runnable "GC Thread#0" os_prio=2 tid=0x000001a38ff2c000 nid=0x9c8 runnable "GC Thread#1" os_prio=2 tid=0x000001a38ff2d800 nid=0x410 runnable "GC Thread#2" os_prio=2 tid=0x000001a38ff30000 nid=0x28e4 runnable "GC Thread#3" os_prio=2 tid=0x000001a38ff33800 nid=0x22a0 runnable "GC Thread#4" os_prio=2 tid=0x000001a38ff35800 nid=0x16e4 runnable "GC Thread#5" os_prio=2 tid=0x000001a38ff3a800 nid=0xfd8 runnable "GC Thread#6" os_prio=2 tid=0x000001a38ff3e000 nid=0x21a0 runnable "GC Thread#7" os_prio=2 tid=0x000001a38ff3f000 nid=0x1b88 runnable "G1 Main Marker" os_prio=2 tid=0x000001a38ff7e800 nid=0x2cd4 runnable "G1 Conc#0" os_prio=2 tid=0x000001a38ff81800 nid=0xe1c runnable "G1 Conc#1" os_prio=2 tid=0x000001a38ff82800 nid=0x91c runnable "G1 Refine#0" os_prio=2 tid=0x000001a38ffde800 nid=0x3350 runnable "G1 Refine#1" os_prio=2 tid=0x000001a3ae8ce000 nid=0x2d74 runnable "G1 Refine#2" os_prio=2 tid=0x000001a3ae8d0000 nid=0x59c runnable "G1 Refine#3" os_prio=2 tid=0x000001a3ae8d0800 nid=0x2f50 runnable "G1 Refine#4" os_prio=2 tid=0x000001a3ae8d5800 nid=0x2750 runnable "G1 Refine#5" os_prio=2 tid=0x000001a3ae8d8800 nid=0xa18 runnable "G1 Refine#6" os_prio=2 tid=0x000001a3ae8db000 nid=0x1c04 runnable "G1 Refine#7" os_prio=2 tid=0x000001a3ae8ec000 nid=0x3220 runnable "G1 Young RemSet Sampling" os_prio=2 tid=0x000001a3ae8ec800 nid=0x23cc runnable
"VM Periodic Task Thread" os_prio=2 tid=0x000001a3af485000 nid=0x1540 waiting on condition JNI global references: 14 #################################################
# 使用-l选项将输出Locked ownable synchronizers 内容
#################################################
PS C:\Users\HBKJ> jstack -l 9796
2018-07-14 14:41:41
Full thread dump Java HotSpot(TM) 64-Bit Server VM (10.0.1+10 mixed mode): Threads class SMR info:
_java_thread_list=0x000001a3b0b585f0, length=14, elements={
0x000001a3aea36000, 0x000001a3aea37000, 0x000001a3aea3d800, 0x000001a3aea3e000,
0x000001a3af2c8800, 0x000001a3af2d1000, 0x000001a3af2d4000, 0x000001a3af2d8000,
0x000001a3af2e8800, 0x000001a3af47f800, 0x000001a3af484000, 0x000001a3afb2f000,
0x000001a38ff10000, 0x000001a3b0cb0800
} "Reference Handler" #2 daemon prio=10 os_prio=2 tid=0x000001a3aea36000 nid=0x1e44 waiting on condition [0x0000008ea28ff000]
java.lang.Thread.State: RUNNABLE
at java.lang.ref.Reference.waitForReferencePendingList(java.base@10.0.1/Native Method)
at java.lang.ref.Reference.processPendingReferences(java.base@10.0.1/Reference.java:174)
at java.lang.ref.Reference.access$000(java.base@10.0.1/Reference.java:44)
at java.lang.ref.Reference$ReferenceHandler.run(java.base@10.0.1/Reference.java:138) Locked ownable synchronizers:
- None "Finalizer" #3 daemon prio=8 os_prio=1 tid=0x000001a3aea37000 nid=0x1308 in Object.wait() [0x0000008ea29fe000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@10.0.1/Native Method)
- waiting on <0x00000000d4e5e9c0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@10.0.1/ReferenceQueue.java:151)
- waiting to re-lock in wait() <0x00000000d4e5e9c0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@10.0.1/ReferenceQueue.java:172)
at java.lang.ref.Finalizer$FinalizerThread.run(java.base@10.0.1/Finalizer.java:216) Locked ownable synchronizers:
- None "Signal Dispatcher" #4 daemon prio=9 os_prio=2 tid=0x000001a3aea3d800 nid=0x196c runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE Locked ownable synchronizers:
- None "Attach Listener" #5 daemon prio=5 os_prio=2 tid=0x000001a3aea3e000 nid=0x3210 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE Locked ownable synchronizers:
- None "C2 CompilerThread0" #6 daemon prio=9 os_prio=2 tid=0x000001a3af2c8800 nid=0xe08 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task Locked ownable synchronizers:
- None "C2 CompilerThread1" #7 daemon prio=9 os_prio=2 tid=0x000001a3af2d1000 nid=0x2a94 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task Locked ownable synchronizers:
- None "C2 CompilerThread2" #8 daemon prio=9 os_prio=2 tid=0x000001a3af2d4000 nid=0x724 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task Locked ownable synchronizers:
- None "C1 CompilerThread3" #9 daemon prio=9 os_prio=2 tid=0x000001a3af2d8000 nid=0x20 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task Locked ownable synchronizers:
- None "Sweeper thread" #10 daemon prio=9 os_prio=2 tid=0x000001a3af2e8800 nid=0x2810 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE Locked ownable synchronizers:
- None "Service Thread" #11 daemon prio=9 os_prio=0 tid=0x000001a3af47f800 nid=0x23a8 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE Locked ownable synchronizers:
- None "Common-Cleaner" #12 daemon prio=8 os_prio=1 tid=0x000001a3af484000 nid=0x29b0 in Object.wait() [0x0000008ea33ff000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(java.base@10.0.1/Native Method)
- waiting on <0x00000000d4e213d8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@10.0.1/ReferenceQueue.java:151)
- waiting to re-lock in wait() <0x00000000d4e213d8> (a java.lang.ref.ReferenceQueue$Lock)
at jdk.internal.ref.CleanerImpl.run(java.base@10.0.1/CleanerImpl.java:148)
at java.lang.Thread.run(java.base@10.0.1/Thread.java:844)
at jdk.internal.misc.InnocuousThread.run(java.base@10.0.1/InnocuousThread.java:134) Locked ownable synchronizers:
- None "JPS event loop" #13 prio=5 os_prio=0 tid=0x000001a3afb2f000 nid=0x1674 runnable [0x0000008ea45fe000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(java.base@10.0.1/Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(java.base@10.0.1/WindowsSelectorImpl.java:296)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(java.base@10.0.1/WindowsSelectorImpl.java:278)
at sun.nio.ch.WindowsSelectorImpl.doSelect(java.base@10.0.1/WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(java.base@10.0.1/SelectorImpl.java:89)
- locked <0x00000000d4e620c8> (a io.netty.channel.nio.SelectedSelectionKeySet)
- locked <0x00000000d4e620e0> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000000d4e62048> (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(java.base@10.0.1/SelectorImpl.java:100)
at io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:752)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:408)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
at java.lang.Thread.run(java.base@10.0.1/Thread.java:844) Locked ownable synchronizers:
- None "DestroyJavaVM" #15 prio=5 os_prio=0 tid=0x000001a38ff10000 nid=0x2278 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE Locked ownable synchronizers:
- None "NettythreadDeathWatcher-2-1" #17 daemon prio=1 os_prio=-2 tid=0x000001a3b0cb0800 nid=0x2740 waiting on condition [0x0000008ea48fe000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(java.base@10.0.1/Native Method)
at io.netty.util.ThreadDeathWatcher$Watcher.run(ThreadDeathWatcher.java:152)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
at java.lang.Thread.run(java.base@10.0.1/Thread.java:844) Locked ownable synchronizers:
- None
"VM Thread" os_prio=2 tid=0x000001a3aea31800 nid=0x1de0 runnable "GC Thread#0" os_prio=2 tid=0x000001a38ff2c000 nid=0x9c8 runnable "GC Thread#1" os_prio=2 tid=0x000001a38ff2d800 nid=0x410 runnable "GC Thread#2" os_prio=2 tid=0x000001a38ff30000 nid=0x28e4 runnable "GC Thread#3" os_prio=2 tid=0x000001a38ff33800 nid=0x22a0 runnable "GC Thread#4" os_prio=2 tid=0x000001a38ff35800 nid=0x16e4 runnable "GC Thread#5" os_prio=2 tid=0x000001a38ff3a800 nid=0xfd8 runnable "GC Thread#6" os_prio=2 tid=0x000001a38ff3e000 nid=0x21a0 runnable "GC Thread#7" os_prio=2 tid=0x000001a38ff3f000 nid=0x1b88 runnable "G1 Main Marker" os_prio=2 tid=0x000001a38ff7e800 nid=0x2cd4 runnable "G1 Conc#0" os_prio=2 tid=0x000001a38ff81800 nid=0xe1c runnable "G1 Conc#1" os_prio=2 tid=0x000001a38ff82800 nid=0x91c runnable "G1 Refine#0" os_prio=2 tid=0x000001a38ffde800 nid=0x3350 runnable "G1 Refine#1" os_prio=2 tid=0x000001a3ae8ce000 nid=0x2d74 runnable "G1 Refine#2" os_prio=2 tid=0x000001a3ae8d0000 nid=0x59c runnable "G1 Refine#3" os_prio=2 tid=0x000001a3ae8d0800 nid=0x2f50 runnable "G1 Refine#4" os_prio=2 tid=0x000001a3ae8d5800 nid=0x2750 runnable "G1 Refine#5" os_prio=2 tid=0x000001a3ae8d8800 nid=0xa18 runnable "G1 Refine#6" os_prio=2 tid=0x000001a3ae8db000 nid=0x1c04 runnable "G1 Refine#7" os_prio=2 tid=0x000001a3ae8ec000 nid=0x3220 runnable "G1 Young RemSet Sampling" os_prio=2 tid=0x000001a3ae8ec800 nid=0x23cc runnable
"VM Periodic Task Thread" os_prio=2 tid=0x000001a3af485000 nid=0x1540 waiting on condition JNI global references: 14

四、在线分析工具

Java Thread Dump Analyzer

简单Java线程状态介绍

作业7:常用java命令(一)的更多相关文章

  1. 作业8:常用java命令(二)

    一.jinfo(Configuration Info for Java) 1.功能:jinfo可以实时地查看和调整虚拟机的各项参数. 2.参数: 选项 作用 -flag name 打印改名字的VM设置 ...

  2. 常用java命令

    javap 反编译 javap xxx.class 查看大概 javap -v -p xxx.class 查看详细 jps 查看有哪些java进程 jinfo 查看或设置java进程的 vm 参数,只 ...

  3. 黑马程序员——JAVA基础之常用DOS命令和环境变量的配置

    ------- android培训.java培训.期待与您交流! ----------   1.常用dos命令: dir   显示当前文件下目录                             ...

  4. Java学习中,常用的命令管理(Java 学习中的小记录)

    Java学习中,常用的命令管理      作者:王可利(Star·星星) 一.Window中常见的dos命令 在哪里操作dos命令: Win7 ---> 开始  ---->所有程序---& ...

  5. java基础基础总结----- 常用DOS命令(一)

    常用DOS命令 dir(directory):列出当前目录下的文件以及文件夹 mkdir (make directory) : 创建目录 rd (remove directory): 删除目录 cd ...

  6. 常用 ADB 命令[ZZ]

    https://blog.csdn.net/yang_zhang_1992/article/details/71404186 1. 显示当前运行的全部模拟器: adb devices 2. 对某一模拟 ...

  7. 掌握这些常用Linux命令,一起提升工作效率

    开始上班了,新一年的奋斗的之路启程了,要继续[奔赴山海,奔赴热爱]. 汪国真在<热爱生命>这首诗中写到:既然选择了远方,便只顾风雨兼程.技术上还是持续精进和学习,远方虽远,要迈开脚步,一步 ...

  8. 常用Keytool 命令

    常用Keytool 命令Keytool 是一个JAVA环境下的安全钥匙与证书的管理工具.它管理一个存储了私有钥匙和验证相应公共钥匙的与它们相关联的X.509 证书链的keystore(相当一个数据库, ...

  9. JAVA命令大全

    1.java.exe:======================运行java程序,这个相信每一位用Java的人知道了. 2.javac.exe:======================编译的Ja ...

随机推荐

  1. pm2 配合log4js处理日志

    1.pm2启动时通常会发现log4js记录不到日志信息: 2.决解方案,安装pm2的pm2-intercom进程间通信模块 3.在log4js的配置文件logger.js里添加如下命令: pm2: t ...

  2. 把文档中的数据取出并插入到excel中

    from xlrd import open_workbookfrom xlutils.copy import copy jsonfile=r'C:\Users\Administrator\Deskto ...

  3. Node安装配置

    下载安装nodejs后进行如下配置: 修改模块安装位置和缓存位置在要存放的位置手动新建全局目录node_global在要存放的位置手动新建缓存目录node_cache执行如下命令:npm config ...

  4. Google Protocol Buffers 快速入门(带生成C#源码的方法)

    Google Protocol Buffers是google出品的一个协议生成工具,特点就是跨平台,效率高,速度快,对我们自己的程序定义和使用私有协议很有帮助. Protocol Buffers入门: ...

  5. 数据库sequence的作用和用法

    转: 数据库sequence的作用和用法 2016年10月14日 19:51:03 很菜很菜的鸟 阅读数 14456 标签: oracle数据库db2sequence   seqence的作用: se ...

  6. 几句java代码搞定十万个为什么数据

    最近想做一个app,为小朋友推荐十万个为什么的故事,但是找了很久数据,发现挺难的找的,又去写爬虫,发现没有一个好的网站可以爬,最后一个偶然的机会在csdn上发现一个可用的接口,很快就把问题解决了,下面 ...

  7. c++ STL之map

    map内部自建一颗红黑树(一 种非严格意义上的平衡二叉树),这颗树具有对数据自动排序的功能,所以在map内部所有的数据都是有序的,map中的元素是自动按Key升序排序,所以不能对map用sort函数: ...

  8. ssm整合的spring.xml文件配置(applicationContext.xml)

    <?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.spr ...

  9. Python3 编程第一步_斐波纳契数列_连续赋值

    # Fibonacci series: 斐波纳契数列 # 两个元素的总和确定了下一个数 a, b = 0, 1 while b < 10: print(b) a, b = b, a+b # 1 ...

  10. 关于MacBook Pro外接4K/60HZ显示器的问题

    我踩过的坑 MacBook Pro 外接 4K/60HZ显示器[显示器自带HDMI2.0支持4k] 拓展坞不支持4K/60HZ,最后导致只能支持 30HZ,鼠标移动明显延迟. 总结如下: DVI线类长 ...