Question

请考虑案例：

HttpURLConnection已打开，但未从套接字接收任何数据（例如，由于防火墙配置）。

另一个线程想要因超时而断开连接，但在ChunkedInputStream.close（）中被阻止：

"thread-2" - Thread t@333
   java.lang.Thread.State: BLOCKED
  at sun.net.www.http.ChunkedInputStream.close(ChunkedInputStream.java:746)
  - waiting to lock <2be20ded> (a sun.net.www.http.ChunkedInputStream)
owned by "thread-1" t@385
  at java.io.FilterInputStream.close(FilterInputStream.java:181)
  at
sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.close(HttpURLConnection.java:3409)
  at
sun.net.www.protocol.http.HttpURLConnection.disconnect(HttpURLConnection.java:2824)
...

"thread-1" - Thread t@385
   java.lang.Thread.State: RUNNABLE
  at java.net.SocketInputStream.socketRead0(Native Method)
  at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
  at java.net.SocketInputStream.read(SocketInputStream.java:170)
  at java.net.SocketInputStream.read(SocketInputStream.java:141)
  at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
  at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
  at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
  - locked <c9077bc> (a java.io.BufferedInputStream)
  at
sun.net.www.http.ChunkedInputStream.readAheadBlocking(ChunkedInputStream.java:552)
  at
sun.net.www.http.ChunkedInputStream.readAhead(ChunkedInputStream.java:609)
  at sun.net.www.http.ChunkedInputStream.read(ChunkedInputStream.java:696)
  - locked <2be20ded> (a sun.net.www.http.ChunkedInputStream)
  at java.io.FilterInputStream.read(FilterInputStream.java:133)
  at
sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3336)
  at java.io.SequenceInputStream.read(SequenceInputStream.java:207)
  at java.io.SequenceInputStream.read(SequenceInputStream.java:207)
  at
org.apache.xerces.impl.XMLEntityManager$RewindableInputStream.read(Unknown
Source)
  at org.apache.xerces.impl.io.UTF8Reader.read(Unknown Source)
  at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
  at org.apache.xerces.impl.XMLEntityScanner.skipChar(Unknown Source)
  at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
  at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
  at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
  at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
  at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
  at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
  at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
Source)
  at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
  at
com.lmax.api.internal.protocol.EventStreamHandler.parseEventStream(EventStreamHandler.java:45)
...
   Locked ownable synchronizers:
  - locked <4dbb989f> (a java.util.concurrent.ThreadPoolExecutor$Worker)

有没有办法避免死锁？我找到的唯一解决方法是在readTimeout上指定connectTimeout和java.net.URLConnection。

有什么想法吗？

SUT：Oracle JDK 1.8.0_102

如何连接/关闭一个被困的HttpURLConnection

0 个答案: