@xixinimei

改成下面单例，好像死锁了。。。


private static OkHttpClient okHttpClient = null;


private HttpTool() {
}

public static OkHttpClient getInstance() {
if (okHttpClient == null) {
//加同步安全
synchronized (HttpTool.class) {
if (okHttpClient == null) {
//判空 为空创建实例
okHttpClient = new OkHttpClient();
}
}

}

return okHttpClient;
}


jstack 日志：
2018-09-27 08:01:43
Full thread dump Java HotSpot(TM) 64-Bit Server VM (24.80-b11 mixed mode):

"Attach Listener" daemon prio=10 tid=0x00007f5d1c001000 nid=0x11ba runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"Okio Watchdog" daemon prio=10 tid=0x00007f5d14924800 nid=0x117c in Object.wait() [0x00007f5d20e12000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000007889c4fd8> (a java.lang.Class for okio.AsyncTimeout)
at okio.AsyncTimeout$Companion.awaitTimeout$jvm(AsyncTimeout.kt:341)
at okio.AsyncTimeout$Watchdog.run(AsyncTimeout.kt:228)
- locked <0x00000007889c4fd8> (a java.lang.Class for okio.AsyncTimeout)

"Java2D Disposer" daemon prio=10 tid=0x00007f5d1491e800 nid=0x110d in Object.wait() [0x00007f5d20131000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x0000000788ba7c48> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135)
- locked <0x0000000788ba7c48> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151)
at sun.java2d.Disposer.run(Disposer.java:145)
at java.lang.Thread.run(Thread.java:745)

"New I/O worker #8" prio=10 tid=0x00007f5d0c014000 nid=0x110c runnable [0x00007f5d2070b000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
- locked <0x00000007fbf15d98> (a sun.nio.ch.Util$2)
- locked <0x00000007fbf15d88> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000007fbf02948> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
at org.jboss.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:52)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:208)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:38)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

"New I/O worker #7" prio=10 tid=0x00007f5d0c011800 nid=0x110b runnable [0x00007f5d2080c000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
- locked <0x000000078859c718> (a sun.nio.ch.Util$2)
- locked <0x000000078859c708> (a java.util.Collections$UnmodifiableSet)
- locked <0x000000078855fb30> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
at org.jboss.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:52)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:208)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:38)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

"New I/O worker #6" prio=10 tid=0x00007f5d0c010000 nid=0x110a runnable [0x00007f5d2090d000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
- locked <0x00000007fbf0fe28> (a sun.nio.ch.Util$2)
- locked <0x00000007fbf0fe18> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000007fbf0d818> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
at org.jboss.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:52)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:208)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:38)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)

"New I/O worker #5" prio=10 tid=0x00007f5d0c003800 nid=0x1109 runnable [0x00007f5d20a0e000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
- locked <0x00000007885c1230> (a sun.nio.ch.Util$2)
- locked <0x00000007885c1220> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000007885b1078> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
at org.jboss.netty.channel.socket.nio.SelectorUtil.select(SelectorUtil.java:52)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:208)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:38)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)