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Unirest异步请求，防止JVM退出

2014-12-20 110 views
0

我试图通过Java中的unirest使用异步回调。但是，从同步请求切换到异步请求后，JVM似乎不会退出。我不确定线程​​转储是什么意思。Unirest异步请求，防止JVM退出

我编译&在Mac OS X上的JDK 1.8.0_25运行此10.9.5 -

00:16 $ java -version 
java version "1.8.0_25" 
Java(TM) SE Runtime Environment (build 1.8.0_25-b17) 
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

这里是代码 -

import com.mashape.unirest.http.HttpResponse; 
import com.mashape.unirest.http.Unirest; 
import com.mashape.unirest.http.async.Callback; 
import com.mashape.unirest.http.exceptions.UnirestException; 
import com.mashape.unirest.request.GetRequest; 

public class SampleTestCase { 

    public static void main(String[] args) { 
     System.out.println("Starting..."); 
     GetRequest reqfuture; 
     reqfuture = Unirest.get("http://www.google.com"); 

     reqfuture.asStringAsync(new Callback<String>() { 
      @Override 
      public void completed(HttpResponse<String> httpResponse) { 
       System.err.println("Completed"); 
      } 

      @Override 
      public void failed(UnirestException e) { 
       System.err.println("Failed"); 

      } 

      @Override 
      public void cancelled() { 
       System.err.println("Cancelled"); 

      } 
     }); 
     System.out.print("Exiting..."); 
    } 
}

这里是程序的输出 -

Starting... 
Exiting...Completed 
2014-12-20 00:41:30

这是线程转储 -

Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode): 

"DestroyJavaVM" #23 prio=5 os_prio=31 tid=0x00007fdcac85e000 nid=0x1903 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

"I/O dispatcher 8" #22 prio=5 os_prio=31 tid=0x00007fdcac08b000 nid=0x7103 runnable [0x000000012d9c5000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) 
    at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) 
    at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) 
    - locked <0x000000076bfc7b80> (a sun.nio.ch.Util$2) 
    - locked <0x000000076bfc7b70> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x000000076bfc7a50> (a sun.nio.ch.KQueueSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) 
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:256) 
    at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105) 
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:584) 
    at java.lang.Thread.run(Thread.java:745) 

"I/O dispatcher 7" #21 prio=5 os_prio=31 tid=0x00007fdcab998000 nid=0x6f03 runnable [0x000000012d8c2000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) 
    at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) 
    at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) 
    - locked <0x000000076bfc7810> (a sun.nio.ch.Util$2) 
    - locked <0x000000076bfc7800> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x000000076bfc76e0> (a sun.nio.ch.KQueueSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) 
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:256) 
    at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105) 
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:584) 
    at java.lang.Thread.run(Thread.java:745) 

"I/O dispatcher 6" #20 prio=5 os_prio=31 tid=0x00007fdcaf017000 nid=0x6d03 runnable [0x000000012d7bf000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) 
    at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) 
    at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) 
    - locked <0x000000076bfc74a0> (a sun.nio.ch.Util$2) 
    - locked <0x000000076bfc7490> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x000000076bfc7370> (a sun.nio.ch.KQueueSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) 
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:256) 
    at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105) 
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:584) 
    at java.lang.Thread.run(Thread.java:745) 

"I/O dispatcher 5" #19 prio=5 os_prio=31 tid=0x00007fdcaf016000 nid=0x6b03 runnable [0x000000012d6bc000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) 
    at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) 
    at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) 
    - locked <0x000000076bfc7130> (a sun.nio.ch.Util$2) 
    - locked <0x000000076bfc7120> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x000000076bfc7000> (a sun.nio.ch.KQueueSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) 
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:256) 
    at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105) 
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:584) 
    at java.lang.Thread.run(Thread.java:745) 

"I/O dispatcher 4" #18 prio=5 os_prio=31 tid=0x00007fdcab94c800 nid=0x6903 runnable [0x000000012d5b9000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) 
    at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) 
    at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) 
    - locked <0x000000076bfc6dc0> (a sun.nio.ch.Util$2) 
    - locked <0x000000076bfc6db0> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x000000076bfc6c90> (a sun.nio.ch.KQueueSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) 
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:256) 
    at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105) 
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:584) 
    at java.lang.Thread.run(Thread.java:745) 

"I/O dispatcher 3" #17 prio=5 os_prio=31 tid=0x00007fdcab94b000 nid=0x6703 runnable [0x000000012d4b6000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) 
    at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) 
    at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) 
    - locked <0x000000076bfc6a50> (a sun.nio.ch.Util$2) 
    - locked <0x000000076bfc6a40> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x000000076bfc6920> (a sun.nio.ch.KQueueSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) 
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:256) 
    at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105) 
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:584) 
    at java.lang.Thread.run(Thread.java:745) 

"I/O dispatcher 2" #16 prio=5 os_prio=31 tid=0x00007fdcaf015800 nid=0x6503 runnable [0x000000012d3b3000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) 
    at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) 
    at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) 
    - locked <0x000000076bfc66e0> (a sun.nio.ch.Util$2) 
    - locked <0x000000076bfc66d0> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x000000076bfc65b0> (a sun.nio.ch.KQueueSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) 
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:256) 
    at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105) 
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:584) 
    at java.lang.Thread.run(Thread.java:745) 

"I/O dispatcher 1" #15 prio=5 os_prio=31 tid=0x00007fdcac82a000 nid=0x6303 runnable [0x000000012d2b0000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) 
    at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) 
    at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) 
    - locked <0x000000076bfc6370> (a sun.nio.ch.Util$2) 
    - locked <0x000000076bfc6360> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x000000076bfc6240> (a sun.nio.ch.KQueueSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) 
    at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:256) 
    at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:105) 
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:584) 
    at java.lang.Thread.run(Thread.java:745) 

"Thread-2" #14 daemon prio=5 os_prio=31 tid=0x00007fdcae070800 nid=0x6103 in Object.wait() [0x000000012d1ad000] 
    java.lang.Thread.State: TIMED_WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x000000076bee9e10> (a com.mashape.unirest.http.async.utils.AsyncIdleConnectionMonitorThread) 
    at com.mashape.unirest.http.async.utils.AsyncIdleConnectionMonitorThread.run(AsyncIdleConnectionMonitorThread.java:22) 
    - locked <0x000000076bee9e10> (a com.mashape.unirest.http.async.utils.AsyncIdleConnectionMonitorThread) 

"pool-1-thread-1" #13 prio=5 os_prio=31 tid=0x00007fdcae064800 nid=0x5f03 runnable [0x000000012d0aa000] 
    java.lang.Thread.State: RUNNABLE 
    at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method) 
    at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:198) 
    at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:103) 
    at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) 
    - locked <0x000000076bc15568> (a sun.nio.ch.Util$2) 
    - locked <0x000000076bc154e8> (a java.util.Collections$UnmodifiableSet) 
    - locked <0x000000076bc13bf0> (a sun.nio.ch.KQueueSelectorImpl) 
    at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) 
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:340) 
    at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:189) 
    at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase.doExecute(CloseableHttpAsyncClientBase.java:67) 
    at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase.access$000(CloseableHttpAsyncClientBase.java:38) 
    at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:57) 
    at java.lang.Thread.run(Thread.java:745) 

"Thread-1" #12 daemon prio=5 os_prio=31 tid=0x00007fdcae94b800 nid=0x5d03 in Object.wait() [0x000000012cf97000] 
    java.lang.Thread.State: TIMED_WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x000000076bbb12f8> (a com.mashape.unirest.http.utils.SyncIdleConnectionMonitorThread) 
    at com.mashape.unirest.http.utils.SyncIdleConnectionMonitorThread.run(SyncIdleConnectionMonitorThread.java:22) 
    - locked <0x000000076bbb12f8> (a com.mashape.unirest.http.utils.SyncIdleConnectionMonitorThread) 

"Monitor Ctrl-Break" #10 daemon prio=5 os_prio=31 tid=0x00007fdcae012000 nid=0x5b03 runnable [0x000000012cc0f000] 
    java.lang.Thread.State: RUNNABLE 
    at java.net.SocketInputStream.socketRead0(Native Method) 
    at java.net.SocketInputStream.read(SocketInputStream.java:150) 
    at java.net.SocketInputStream.read(SocketInputStream.java:121) 
    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 <0x000000076b026110> (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 <0x000000076b026110> (a java.io.InputStreamReader) 
    at java.io.BufferedReader.readLine(BufferedReader.java:389) 
    at com.intellij.rt.execution.application.AppMain$1.run(AppMain.java:88) 
    at java.lang.Thread.run(Thread.java:745) 

"Service Thread" #9 daemon prio=9 os_prio=31 tid=0x00007fdcaf00a000 nid=0x5703 runnable [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

"C1 CompilerThread3" #8 daemon prio=9 os_prio=31 tid=0x00007fdcae800000 nid=0x5503 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

"C2 CompilerThread2" #7 daemon prio=9 os_prio=31 tid=0x00007fdcac809000 nid=0x5303 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

"C2 CompilerThread1" #6 daemon prio=9 os_prio=31 tid=0x00007fdcab82c800 nid=0x5103 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

"C2 CompilerThread0" #5 daemon prio=9 os_prio=31 tid=0x00007fdcab82b000 nid=0x4f03 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

"Signal Dispatcher" #4 daemon prio=9 os_prio=31 tid=0x00007fdcab838000 nid=0x4d03 waiting on condition [0x0000000000000000] 
    java.lang.Thread.State: RUNNABLE 

"Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007fdcab812000 nid=0x3903 in Object.wait() [0x000000012c120000] 
    java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x000000076ab06280> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:142) 
    - locked <0x000000076ab06280> (a java.lang.ref.ReferenceQueue$Lock) 
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:158) 
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209) 

"Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x00007fdcab05c800 nid=0x3703 in Object.wait() [0x000000012c01d000] 
    java.lang.Thread.State: WAITING (on object monitor) 
    at java.lang.Object.wait(Native Method) 
    - waiting on <0x000000076ab05cf0> (a java.lang.ref.Reference$Lock) 
    at java.lang.Object.wait(Object.java:502) 
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157) 
    - locked <0x000000076ab05cf0> (a java.lang.ref.Reference$Lock) 

"VM Thread" os_prio=31 tid=0x00007fdcab058000 nid=0x3503 runnable 

"GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007fdcab80f800 nid=0x2503 runnable 

"GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007fdcae000000 nid=0x2703 runnable 

"GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007fdcab810000 nid=0x2903 runnable 

"GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007fdcab810800 nid=0x2b03 runnable 

"GC task thread#4 (ParallelGC)" os_prio=31 tid=0x00007fdcab811000 nid=0x2d03 runnable 

"GC task thread#5 (ParallelGC)" os_prio=31 tid=0x00007fdcac807800 nid=0x2f03 runnable 

"GC task thread#6 (ParallelGC)" os_prio=31 tid=0x00007fdcae001000 nid=0x3103 runnable 

"GC task thread#7 (ParallelGC)" os_prio=31 tid=0x00007fdcae001800 nid=0x3303 runnable 

"VM Periodic Task Thread" os_prio=31 tid=0x00007fdcab840800 nid=0x5903 waiting on condition 

JNI global references: 283 

Heap 
PSYoungGen  total 76288K, used 39323K [0x000000076ab00000, 0x0000000770000000, 0x00000007c0000000) 
    eden space 65536K, 60% used [0x000000076ab00000,0x000000076d166e60,0x000000076eb00000) 
    from space 10752K, 0% used [0x000000076f580000,0x000000076f580000,0x0000000770000000) 
    to space 10752K, 0% used [0x000000076eb00000,0x000000076eb00000,0x000000076f580000) 
ParOldGen  total 175104K, used 0K [0x00000006c0000000, 0x00000006cab00000, 0x000000076ab00000) 
    object space 175104K, 0% used [0x00000006c0000000,0x00000006c0000000,0x00000006cab00000) 
Metaspace  used 9174K, capacity 9400K, committed 9728K, reserved 1058816K 
    class space used 1102K, capacity 1155K, committed 1280K, reserved 1048576K

任何解决此问题的指针都会很有用。

来源

2014-12-20 Dinesh

回答

0

我们可以从转储中看到有两个线程com.mashape.unirest.http.utils.SyncIdleConnectionMonitorThread被卡住（可能是死锁）。

绝大多数机会是，您使用的库不释放资源或存在死锁。一个丑陋的解决方法是使用System.exit()作为completed()中的最后一项操作，但个人而言，我宁愿找到另一个（更稳定）提供相同服务的库。

您面临的问题也有可能是由于您正在运行IDE（IntelliJ）中的代码。尝试从命令行运行相同的代码并查看是否可以重现。

来源

2014-12-20 09:29:41 alfasin

1

你需要调用Unirest.shutdown();

见documentation`

来源

2015-02-04 21:40:41 Dejell

+0

关机是一个不错的选择。但是，我所经历的是，Tomcat提供了30秒的关机时间。当调用'Unirest.shutdown（）'时，'SyncIdleConnectionMonitorThread'（关闭3个服务之一）将等待5秒钟，然后再等待30秒。你知道如何：强制更快的关机，或增加30秒Tomcat允许的关机时间（或战争停止时间）？ – Danielson

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