Hi,
It's not clear what's happening - could you say some more about your
environment?
Is it always at the same point?
Which OS? (Windows?)
Which version of Jena?
Which version of Java?
What's the hardware? How many cores?
Lots on stackoverflow but this looks close:
http://stackoverflow.com/questions/4708649/java-net-bindexception-address-already-in-use-when-trying-to-do-rapid-socket
On Linux:
The Jena tests provoked a similar situation where we saw TCP sockets not
getting recycled fast enough when the CPUs are all busy.
Programs run into problems when opening/closing sockets at high
frequency for a sustained period of time when the server is on the same
system as the client, as it is here.
If so, put a short wait in your loop.
Run "netstat -t" ; if you see a lot of connections and they go away
after a couple of minutes, then its zombie connections.
It may help to reconfigure the low level HTTP setup with
HttpOp.setDefaultHttpClient(HttpClient); Remote SPARQL uses the Jena
default but that may not fix the issue.
TDB in the same JVM does not use network connections.
Andy
On 11/10/15 10:40, Billig, Andreas wrote:
Hello team,
we are developing a constraints checker (schema-check under Closed World
Assumption (OWL, RDFS, etc.)) for a quad store and implement it via SPARQL/HTTP.
We ran into java.net.BindException during query evaluation.
I have isolated the code and made an abstraction. So now with the following code
-----
for (int i = 0; i < 20000; i++) { // TODO (i:~16300)
QueryExecution qe =
QueryExecutionFactory.sparqlService("http://localhost:3030/Yyy/query";,
"select * {?x ?y ?z}"); // only two solutions to keep the result set small
System.out.println(i);
ResultSet rs = qe.execSelect();
while (rs.hasNext()) {
System.out.println(rs.next());
}
qe.close();
}
-----
I got an exception around i > 16000 (so may be some queuing is involved) with
trace
------
HttpException: java.net.BindException: Address already in use: connect:
Unexpected error making the query: java.net.BindException: Address already in
use: connect
at com.hp.hpl.jena.sparql.engine.http.HttpQuery.rewrap(HttpQuery.java:417)
at com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:358)
at com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:295)
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execResultSetInner(QueryEngineHTTP.java:346)
at
com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:338)
<own trace items>
...
Caused by: java.net.BindException: Address already in use: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at
java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at
java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at
java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
...
------
Is this a known problem? It would be nice to have some solution because I
prefer not to go back to embedded TDB, where this error probably does not occur
(?).
thanks in advance, Andreas
