Exception using HttpRequest.execute(): Invalid use of SingleClientConnManager: connection still allocated

I'm using google-api-client-java 1.2.1-alpha to execute a POST request, and am getting the following stacktrace when I execute() the HttpRequest.

It happens immediately after I catch and ignore a 403 error from a previous POST to the same URL, and re-used the transport for the subsequent request. (It's in a loop inserting multiple entries to the same ATOM feed).

Is there something I should be doing to 'clean up' after a 403?

Exception in thread "main" java.lang.IllegalStateException: Invalid use of SingleClientConnManager: connection still allocated.
Make sure to release the connection before allocating another one.
    at org.apache.http.impl.conn.SingleClientConnManager.getConnection(SingleClientConnManager.java:199)
    at org.apache.http.impl.conn.SingleClientConnManager$1.getConnection(SingleClientConnManager.java:173)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:390)
    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)
    at com.google.api.client.apache.ApacheHttpRequest.execute(ApacheHttpRequest.java:47)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:207)
    at au.com.machaira.pss.gape.RedirectHandler.execute(RedirectHandler.java:38)
    at au.com.machaira.pss.gape.ss.model.records.TableEntry.executeModification(TableEntry.java:81)

Why would the code below me be trying to acquire a new connection?

You need to consume the response body before you can reuse the connection for another request. You should not only read the response status, but read the response InputStream fully to the last byte whereby you just ignore the read bytes.

I was facing a similar issue when using the HttpClient with Jetty to build a test framework. I had to create multiple requests to the Servelet from my client, but It was giving the same exception when executed.

I found an alternative at http://foo.jasonhudgins.com/2010/03/http-connections-revisited.html

You can also use this following method to instantiate your client.

public static DefaultHttpClient getThreadSafeClient()  {

    DefaultHttpClient client = new DefaultHttpClient();
    ClientConnectionManager mgr = client.getConnectionManager();
    HttpParams params = client.getParams();
    client = new DefaultHttpClient(new ThreadSafeClientConnManager(params, 

            mgr.getSchemeRegistry()), params);
    return client;
}