tomcat线程一直处于RUNNABLE，不接受请求 400 请求报错
现在对tomcat一个工程（会通过httpurlconnection去请求别的资源）并发过多时候，tomcat直接跟挂去一样，再输入任何地址都一直不响应。通过java自带的检测工具看到像http-8080-1这样的http线程全部一直处于RUNNABLE状态，正常应该请求完处于WAITING。现在不知道是什么原因导致的，希望有大神给分析下，感激不尽！下面是线程dump，就随便贴两个：
"http-8080-7" daemon prio=6 tid=0x183bd400 nid=0x6f50 runnable [0x1958f000] java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.read(SocketInputStream.java:129) at java.io.BufferedInputStream.fill(BufferedInputStream.java:218) at java.io.BufferedInputStream.read1(BufferedInputStream.java:258) at java.io.BufferedInputStream.read(BufferedInputStream.java:317) - locked <0x09cd8e58> (a java.io.BufferedInputStream) at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687) at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1195) - locked <0x09b2a448> (a sun.net.www.protocol.http.HttpURLConnection) at peacemap.coorshare.search.LocalSearch.getInfoFromService(LocalSearch.java:163) at peacemap.coorshare.search.LocalSearch.doGet(LocalSearch.java:80) at peacemap.coorshare.search.LocalSearch.doPost(LocalSearch.java:141) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:662) Locked ownable synchronizers: - None "http-8080-6" daemon prio=6 tid=0x183bcc00 nid=0x6f48 runnable [0x1953f000] java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.read(SocketInputStream.java:129) at java.io.BufferedInputStream.fill(BufferedInputStream.java:218) at java.io.BufferedInputStream.read1(BufferedInputStream.java:258) at java.io.BufferedInputStream.read(BufferedInputStream.java:317) - locked <0x09b2c688> (a java.io.BufferedInputStream) at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687) at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1195) - locked <0x09b2c728> (a sun.net.www.protocol.http.HttpURLConnection) at peacemap.coorshare.search.LocalSearch.getInfoFromService(LocalSearch.java:163) at peacemap.coorshare.search.LocalSearch.doGet(LocalSearch.java:80) at peacemap.coorshare.search.LocalSearch.doPost(LocalSearch.java:141) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:662) Locked ownable synchronizers: - None
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网络IO阻塞,HttpURLConnection 启动太多了.######差不多就是这个意思，呵呵######可能是你程序里面任何一个地方的锁死问题。建议在有可能长时间操作的地方使用线程，让http线程能及时释放###### 这个是代码实现，请大家帮看看有啥问题。谢谢了
package peacemap.coorshare.search; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.io.Reader; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.ProtocolException; import java.net.URL; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class test extends HttpServlet { public test() { super(); } public void destroy() { super.destroy(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String url = "http://localhost:8080/solr/select/?q=name%3A%E8%B4%B5%E5%B7%9E&version=2.2&start=0&rows=10&indent=on&wt=json"; response.setContentType("text/html"); response.setCharacterEncoding("UTF-8"); PrintWriter printWriter = response.getWriter(); String returnStr=getInfoFromService(url); System.out.println(returnStr); printWriter.write(returnStr); printWriter.close(); } private String getInfoFromService(String url) { String resultStr = ""; try { URL destURL = new URL(url); HttpURLConnection urlConn = (HttpURLConnection) destURL .openConnection(); urlConn.setRequestMethod("GET"); urlConn.setDoOutput(true); urlConn.setDoInput(true); urlConn.setUseCaches(false); InputStreamReader inStream = new InputStreamReader(urlConn .getInputStream(), "utf-8"); resultStr = getRequestContent(inStream); inStream.close(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (ProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return resultStr; } private String getRequestContent(Reader reader) throws IOException { StringBuffer sb = null; sb = new StringBuffer(); char[] data = new char[1024]; int i = reader.read(data); while (i != -1) { sb.append(data, 0, i); i = reader.read(data); } String sreq = sb.toString(); return sreq; } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } public void init() throws ServletException { } }inStream.close();
流没关闭吧， 试一下把这个放在finally里面 ######这个。。。不是这个问题###### 这个连接没有手动释放掉吧
finally{ urlConn.close(); }1.大量的并发，导致请求将tomcat的连接数占满。
- 每个并发请求线程 需要tomcat连接去访问其他资源String returnStr=getInfoFromService(url);
导致：每一个请求都在等待tomcat连接而挂起。
以上纯属猜测，并无依据。 ######嗯，就是这个原因啊######设置下请求超时时间，如果请求超时未处理会导致大量线程在等待 RequestConfig config = RequestConfig.custom().setConnectTimeout(6000).setSocketTimeout(6000).build(); httpPost.setConfig(config);######建议jstack看一下 ######第一个，请强制关闭流；第二个请关闭请求，在做http请求的时候，每次都要调用close，谢谢。
2020-05-29 22:50:29赞同 展开评论 打赏 - 每个并发请求线程 需要tomcat连接去访问其他资源String returnStr=getInfoFromService(url);
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