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Editorial Team
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Asked: 2026-06-10T04:41:27+00:00

I have some problems with my app. In market reports often appears ANR repostr

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I have some problems with my app.
In market reports often appears ANR repostr with HttpClient errors. There are

java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2016)
at org.apache.http.impl.conn.tsccm.WaitingThread.await(WaitingThread.java:159)
at org.apache.http.impl.conn.tsccm.ConnPoolByRoute.getEntryBlocking(ConnPoolByRoute.java:339)
at org.apache.http.impl.conn.tsccm.ConnPoolByRoute$1.getPoolEntry(ConnPoolByRoute.java:238)
at org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager$1.getConnection(ThreadSafeClientConnManager.java:175)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:325)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:580)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:512)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:490)

java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2022)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:413)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1014)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1074)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574)
at java.lang.Thread.run(Thread.java:1020)

DALVIK THREADS:
(mutexes: tll=0 tsl=0 tscl=0 ghl=0 hwl=0 hwll=0)
“main” prio=5 tid=1 NATIVE
| group=”main” sCount=1 dsCount=0 obj=0x40027550 self=0xcfc0
| sysTid=2557 nice=0 sched=0/0 cgrp=default handle=-1345006240
| schedstat=( 6440246597 181026702867 12047 )
at org.apache.harmony.luni.platform.OSNetworkSystem.connect(Native Method)
at dalvik.system.BlockGuard$WrappedNetworkSystem.connect(BlockGuard.java:357)
at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207)
at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:440)
at java.net.Socket.connect(Socket.java:1013)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:359)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465

There are any approach to avoid this errors? Maybe some best practice how to work with httpClient? In my app I am usung:

 public ApiImpl() {
    this.httpClient = new DefaultHttpClient();
    ClientConnectionManager mgr = httpClient.getConnectionManager();
    HttpParams params = httpClient.getParams();
    this.httpClient = new DefaultHttpClient(new ThreadSafeClientConnManager(params, mgr.getSchemeRegistry()), params);
}


public class Client {

private static Api api;
private static Client instance = null;


public static Client getInstance() {
    if (instance == null) {
        instance = new Client();
    }
    return instance;
}

 private Client() {
    api = new ApiImpl();
}

}

then in code I am useing following

Client client = Client.getInstance();
client.do();
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1 Answer

  1. Editorial Team

    The problem was that I not read entire response body . I just only check response is null or not if I expected boolean result. You must read response body in any case and and close response stream before next call of http client instance. For example

      InputStream stream = response.getEntity().getContent();

  private String streamToString(InputStream is) {
        if (is == null) return null;
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
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