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:UsersHBKJDesktopTestJavac>javac TestJavac.java
C:UsersHBKJDesktopTestJavac>dir
C:UsersHBKJDesktopTestJavac 的目录
2018/07/21 12:30 <DIR> .
2018/07/21 12:30 <DIR> ..
2018/07/21 12:26 774 TestJavac$Person.class // 内部类
2018/07/21 12:26 783 TestJavac.class
2018/07/21 12:26 842 TestJavac.java
3 个文件 2,399 字节
2 个目录 13,931,593,728 可用字节
二、javap
1、功能：javap是Java字节码文件分解器，能够反编译javac生成的字节码；也能够查看java编译器生成的字节码，用于分解class文件。
2、例子
（1）命令：javap -p
C:UsersHBKJDesktopTestJavac>javap -p TestJavac.class
Compiled from "TestJavac.java"
public class TestJavac {
public TestJavac();
public static void main(java.lang.String[]);
}
（2）命令：javap -c
C:UsersHBKJDesktopTestJavac>javap -c TestJavac.class
Compiled from "TestJavac.java"
public class TestJavac {
public TestJavac(); // 构造器
Code:
0: aload_0
1: invokespecial #1 // Method java/lang/Object."<init>":()V
4: return
public static void main(java.lang.String[]);
Code:
0: getstatic #2 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #3 // String Test Javac
5: invokevirtual #4 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: new #5 // class TestJavac$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:Windowssystem32> jps
9024 Jps
9796 Launcher
9860
PS C:Windowssystem32> jps -l
9796 org.jetbrains.jps.cmdline.Launcher
9860
8540 jdk.jcmd/sun.tools.jps.Jps
PS C:Windowssystem32> jps -v
8404 Jps -Dapplication.home=E:developsoftwarejava10jdk -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:softwareIntelliJ IDEA 2018.1.1 -Didea.config.path=C:UsersHBKJ.IntelliJIdea2018.1config -Didea.plugins.path=C:UsersHBKJ.IntelliJIdea2018.1configplugins -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:softwareIntelliJ IDEA 2018.1.1inidea64.exe.vmoptions -Didea.jre.check=true -Dide.native.launcher=true -Didea.paths.selector=IntelliJIdea2018.1 -XX:ErrorFile=C:UsersHBKJjava_error_in_idea_%p.log -XX:HeapDumpPath=C:UsersHBKJjava_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:UsersHBKJ> 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:UsersHBKJ> 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