okhttp3:无法创建新的本机线程 [英] okhttp3 : unable to create new native thread

问题描述

遇到一个奇怪的问题，经过一些尝试，我无法重现.如何复制它以及它为什么发生?

Encountered a strange problem, I couldn't reproduce it after some attempts. How to reproduce it and why it happend?

这是一项非并行任务，请循环调用HTTP连接.

It's a non-concurrent task, Call the HTTP connection in a loop.

    public static Response syncGet(URL url) throws IOException {
        log.debug("http url:{}", url);
        OkHttpClient client = new OkHttpClient().newBuilder().connectTimeout(15L, TimeUnit.SECONDS)
                .readTimeout(30L, TimeUnit.SECONDS).build();

        Request request = new Request.Builder().url(url).get().addHeader("cache-control", "no-cache").build();
        Call call = client.newCall(request);
        return call.execute();
    }

堆栈:

    2019-12-05 11:20:56.068 ERROR 18484 --- [   scheduling-1] o.s.s.s.TaskUtils$LoggingErrorHandler    : Unexpected error occurred in scheduled task

    java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method) [na:1.8.0_181]
        at java.lang.Thread.start(Thread.java:717) [na:1.8.0_181]
        at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:957) [na:1.8.0_181]
        at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1378) [na:1.8.0_181]
        at okhttp3.ConnectionPool.put(ConnectionPool.java:153) ~[okhttp-3.12.1.jar:na]
        at okhttp3.OkHttpClient$1.put(OkHttpClient.java:167) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:266) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147) ~[okhttp-3.12.1.jar:na]
        at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121) ~[okhttp-3.12.1.jar:na]
        at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254) ~[okhttp-3.12.1.jar:na]
        at okhttp3.RealCall.execute(RealCall.java:92) ~[okhttp-3.12.1.jar:na]
        at chances.cms.util.HttpUtil.syncGet(HttpUtil.java:67) ~[classes/:na]
        at chances.cms.task.CheckTask.checkContent(CheckTask.java:76) ~[classes/:na]
        at chances.cms.task.CheckTask.check(CheckTask.java:60) ~[classes/:na]
        at chances.cms.task.CheckTask.check(CheckTask.java:51) ~[classes/:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
        at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:84) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
        at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
        at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93) [spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_181]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_181]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_181]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_181]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_181]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_181]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]

推荐答案

OkHttpClients应该共享

OkHttpClients should be shared

在创建单个OkHttpClient实例并将其用于所有HTTP调用时，OkHttp的性能最佳.这是因为每个客户端都拥有自己的连接池和线程池.重用连接和线程可减少延迟并节省内存.

OkHttp performs best when you create a single OkHttpClient instance and reuse it for all of your HTTP calls. This is because each client holds its own connection pool and thread pools. Reusing connections and threads reduces latency and saves memory.

更多详细信息: https://square.github. io/okhttp/3.x/okhttp/okhttp3/OkHttpClient.html

因此在syncGet方法之外创建client应该可以解决您的问题.

so creating the client outside of the syncGet method should solve your problem.

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