I am having an issue with HttpClient 4.01. When I try to access
www.google.com or any other website I get a "java.net.SocketException:
Permission denied: connect". There is no firewall or other software blocking
Java and there are no proxies involved.
Here is the stack trace:
2010-06-23 21:42:57,803 [main] DEBUG
org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager -
ThreadSafeClientConnManager.getConnection:
HttpRoute[{}->http://www.google.com], timeout = 15000
2010-06-23 21:42:57,806 [main] DEBUG
org.apache.http.impl.conn.tsccm.ConnPoolByRoute - Total connections kept
alive: 0
2010-06-23 21:42:57,807 [main] DEBUG
org.apache.http.impl.conn.tsccm.ConnPoolByRoute - Total issued connections:
0
2010-06-23 21:42:57,808 [main] DEBUG
org.apache.http.impl.conn.tsccm.ConnPoolByRoute - Total allocated
connection: 0 out of 5
2010-06-23 21:42:57,810 [main] DEBUG
org.apache.http.impl.conn.tsccm.ConnPoolByRoute - No free connections
[HttpRoute[{}->http://www.google.com]][null]
2010-06-23 21:42:57,810 [main] DEBUG
org.apache.http.impl.conn.tsccm.ConnPoolByRoute - Available capacity: 2 out
of 2 [HttpRoute[{}->http://www.google.com]][null]
2010-06-23 21:42:57,811 [main] DEBUG
org.apache.http.impl.conn.tsccm.ConnPoolByRoute - Creating new connection
[HttpRoute[{}->http://www.google.com]]
2010-06-23 21:42:58,126 [main] DEBUG
org.apache.http.impl.conn.DefaultClientConnection - Connection shut down
2010-06-23 21:42:58,127 [main] DEBUG
org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager - Released
connection is not reusable.
2010-06-23 21:42:58,128 [main] DEBUG
org.apache.http.impl.conn.tsccm.ConnPoolByRoute - Releasing connection
[HttpRoute[{}->http://www.google.com]][null]
2010-06-23 21:42:58,128 [main] DEBUG
org.apache.http.impl.conn.tsccm.ConnPoolByRoute - Notifying no-one, there
are no waiting threads
java.net.SocketException: Permission denied: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at
org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:123)
at
org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:123)
at
org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:147)
at
org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:108)
at
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:415)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:641)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:576)
at
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:554)
Here is my HttpClient code:
HttpParams params = new BasicHttpParams();
ConnManagerParams.setMaxTotalConnections(params, 5);
ConnManagerParams.setTimeout(params, 15 * 1000);
HttpConnectionParams.setStaleCheckingEnabled(params, true);
HttpConnectionParams.setConnectionTimeout(params, 15 * 1000);
HttpConnectionParams.setSoTimeout(params, 20 * 1000);
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
// Create and initialize scheme registry
SchemeRegistry schemeRegistry = new SchemeRegistry();
schemeRegistry.register(new Scheme("http",
PlainSocketFactory.getSocketFactory(), 80));
schemeRegistry.register(new Scheme("https",
SSLSocketFactory.getSocketFactory(), 443));
// Create an HttpClient with the ThreadSafeClientConnManager.
// This connection manager must be used if more than one thread will
// be using the HttpClient.
ClientConnectionManager cm = new ThreadSafeClientConnManager(params,
schemeRegistry);
httpclient = new DefaultHttpClient(cm, params);
httpclient.setKeepAliveStrategy(new ConnectionKeepAliveStrategy() {
@Override
public long getKeepAliveDuration(HttpResponse response,
HttpContext context) {
// default keep alive for 100 seconds
long keepAlive = 100 * 1000;
// Honor 'keep-alive' header
HeaderElementIterator it = new BasicHeaderElementIterator(
response.headerIterator(HTTP.CONN_KEEP_ALIVE));
while (it.hasNext()) {
HeaderElement he = it.nextElement();
String param = he.getName();
String value = he.getValue();
if (value != null && param.equalsIgnoreCase("timeout"))
{
try {
keepAlive = Long.parseLong(value) * 1000;
break;
} catch (NumberFormatException ex) {
if (log.isInfoEnabled()) {
log.warn("Unable to parse timeout within
http header", ex);
}
}
}
}
// if you want custom keep-alive for a specific target
//HttpHost target = (HttpHost)
context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);
return keepAlive;
}
});
httpclient.setHttpRequestRetryHandler(new HttpRequestRetryHandler()
{
@Override
public boolean retryRequest(
IOException exception,
int executionCount,
HttpContext context) {
if (executionCount >= 5) {
// Do not retry if over max retry count
return false;
}
if (exception instanceof NoHttpResponseException) {
// Retry if the server dropped connection on us
return true;
}
if (exception instanceof SSLHandshakeException) {
// Do not retry on SSL handshake exception
return false;
}
HttpRequest request = (HttpRequest) context.getAttribute(
ExecutionContext.HTTP_REQUEST);
boolean idempotent = !(request instanceof
HttpEntityEnclosingRequest);
if (idempotent) {
// Retry if the request is considered idempotent
return true;
}
return false;
}
});
And the get request code:
final HttpGet httpget = new HttpGet(URL);
HttpResponse response = null;
HttpEntity entity = null;
String entityContent = null;
try {
response = httpclient.execute(httpget);
entity = response.getEntity();
if (entity != null) {
entity.consumeContent();
}
} catch (UnknownHostException ex) {
httpget.abort();
entityContent = null;
if (log.isDebugEnabled()) {
log.debug("Unable to reach host", ex);
}
} catch (IOException ex) {
httpget.abort();
entityContent = null;
log.error("Unable to consume entity content", ex);
} catch (RuntimeException ex) {
// In case of an unexpected exception you may want to abort
// the HTTP request in order to shut down the underlying
// connection and release it back to the connection manager.
httpget.abort();
entityContent = null;
log.error("Unexpected exception during runtime", ex);
}
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