Here is how I use it -
private static final PoolingHttpClientConnectionManager connPool;
static {
connPool = new PoolingHttpClientConnectionManager();
// Increase max total connection to 200
connPool.setMaxTotal(200);//configurable through app.properties
// Increase default max connection per route to 50
connPool.setDefaultMaxPerRoute(20);//configurable through app.properties
}
CloseableHttpClient httpClient = HttpClients.custom()
.setConnectionManager(connPool) .build();
ALso I have put a finally block around http GET -
finally {
try {
httpClient.close();
} catch (IOException e) {
LOGGER.error(e.getMessage());
}
}
Here is my stacktrace -
java.lang.IllegalStateException: Connection pool shut down
at org.apache.http.util.Asserts.check(Asserts.java:34)
at org.apache.http.pool.AbstractConnPool.lease(AbstractConnPool.java:169)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.requestConnection(PoolingHttpClientConnectionManager.java:217)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:157)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:194)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:85)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
at com.A.B.C.CustomHttpClient.doGETAndValidate(CustomHttpClient.java:44)
at com.A.B.C.SiteMonitorTask.monitorAndUpdateEndPoints(SiteMonitorTask.java:48)
at com.A.B.C.SiteMonitorTask.run(SiteMonitorTask.java:37)
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:744)
I am using Quartz to schedule a job of monitoring Http end points.. Here is my connection pool configuration
totalMaxHttpConn=200
maxHttpConnPerRoute=20
Maven dependency.. artifact version
httpclient 4.3.1
httpcore 4.3.1
EDIT - Well the problem got away by not closing CloseableHttpClient in the finally block.. Can anyone tell why is it behaving like that? Why is connection pool shut down if i close a client?
Is the closeablehttpclient above is a handle to the pool rather than a single conn
This behavior is due to a bug in HC 4.3. It has already been fixed in HC 4.4a1. As of 4.4 CloseableHttpClient#close
should automatically shut down the connection pool only if exclusively owned by the client