"java.net.BindException: Address in use" exception

hi,
i have an application which makes 10 httpcall per second approximately. it was working fine but last a few days i am getting this exception;

java.net.BindException: Address in use
      at jrockit.net.SocketNativeIO.connect(ILjava/net/InetAddress;IIIZ)I(Unknown Source)
      at jrockit.net.SocketNativeIO.connect(Ljava/io/FileDescriptor;Ljava/net/InetAddress;III)I(Unknown Source)
      at java.net.AbstractSocketImpl.doConnect(Ljava/net/InetAddress;II)V(Optimized Method)
      at java.net.PlainSocketImpl.doConnect(Ljava/net/InetAddress;II)V(Unknown Source)
      at java.net.PlainSocketImpl.connectToAddress(Ljava/net/InetAddress;II)V(Unknown Source)
      at java.net.PlainSocketImpl.connect(Ljava/net/SocketAddress;I)V(Unknown Source)
      at java.net.Socket.connect(Ljava/net/SocketAddress;I)V(Optimized Method)
      at jrockit.reflect.NativeMethodInvoker.invoke0(Ljava/lang/Object;ILjava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;(Unknown Source)
      at jrockit.reflect.NativeMethodInvoker.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;(Optimized Method)
      at jrockit.reflect.VirtualNativeMethodInvoker.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;(Optimized Method)
      at java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;I)Ljava/lang/Object;(Optimized Method)
      at org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(Ljava/lang/String;Ljava/lang/String;ILjava/net/InetAddress;II)Ljava/net/Socket;(Optimized Method)
      at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(Ljava/lang/String;ILjava/net/InetAddress;ILorg/apache/commons/httpclient/params/HttpConnectionParams;)Ljava/net/Socket;(Optimized Method)
      at org.apache.commons.httpclient.HttpConnection.open()V(Optimized Method)
      at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open()V(Optimized Method)
      at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(Lorg/apache/commons/httpclient/HttpMethod;)V(Optimized Method)
      at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(Lorg/apache/commons/httpclient/HttpMethod;)V(Optimized Method)
      at org.apache.commons.httpclient.HttpClient.executeMethod(Lorg/apache/commons/httpclient/HostConfiguration;Lorg/apache/commons/httpclient/HttpMethod;Lorg/apache/commons/httpclient/HttpState;)I(Optimized Method)
      at com.ysnky.test.utils.HttpCall.postCallMultiThreaded(Ljava/lang/String;)Ljava/lang/String;(Optimized Method)
      at com.ysnky.test.iwis.bscs.IWISMain.sendCommand(Ljava/lang/String;)Ljava/lang/String;(Optimized Method)
      at com.ysnky.test.iwis.bscs.IwisCombinedInDetail.queryMsisdn(Ljava/lang/String;)Lcom/ysnky/test/utils/IWISResult;(Optimized Method)
      at com.ysnky.test.ejb.PrePaidTryDecAMDBBean.checkEnoughCredit(Lcom/ysnky/test/VO/TransferStateVO;)Z(Optimized Method)
      at com.ysnky.test.ejb.PrePaidTryDecAMDBBean.preDecA(Lcom/ysnky/test/VO/TransferStateVO;)V(Optimized Method)
      at com.ysnky.test.ejb.PrePaidTryDecAMDBBean.onMessage(Ljavax/jms/Message;)V(Optimized Method)
      at weblogic.ejb20.internal.MDListener.execute(Lweblogic/kernel/ExecuteThread;)V(Optimized Method)
      at weblogic.ejb20.internal.MDListener.transactionalOnMessage(Ljavax/jms/Message;)V(Optimized Method)
      at weblogic.ejb20.internal.MDListener.onMessage(Ljavax/jms/Message;)V(Optimized Method)
      at weblogic.jms.client.JMSSession.onMessage(Ljavax/jms/MessageListener;Lweblogic/jms/common/MessageImpl;)V(Optimized Method)
      at weblogic.jms.client.JMSSession.execute(Lweblogic/kernel/ExecuteThread;)V(Optimized Method)
      at weblogic.kernel.ExecuteThread.execute(Lweblogic/kernel/ExecuteRequest;)V(Optimized Method)
      at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:183)
      at java.lang.Thread.startThreadFromVM(Ljava/lang/Thread;)V(Unknown Source)


i am using apache httpclient 3.1 with MultiThreadedHttpConnectionManager feature and my httpcall method in below.
it is very strange why i am getting this error. yes when a socket connection is setup, any port will be binded in client side too but why it is trying inused port, why it doesnt find any idle one?

thanks in advance.

public static String postCallMultiThreaded(String XML) {
        
      MultiThreadedHttpConnectionManager connectionManager = new MultiThreadedHttpConnectionManager();
	 	connectionManager.getParams().setDefaultMaxConnectionsPerHost(2);
		connectionManager.getParams().setMaxTotalConnections(20);
	 	HttpClient client = new HttpClient(connectionManager);
	  	
	  	client.getHttpConnectionManager().getParams().setConnectionTimeout(HTTP_CONNECTION_TIMEOUT);
		client.getHttpConnectionManager().getParams().setSoTimeout(HTTP_READ_TIMEOUT);
      String	responseBody="";
		PostMethod method = new PostMethod(URL);
		
	    // Provide custom retry handler is necessary
	    method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(0, false));		    
 
	    logger.debug("postFromHttp url:" + URL);
	    try {
	        method.setRequestEntity(new StringRequestEntity(XML));
	        client.executeMethod(method);
	        if (method.getStatusCode() == HttpStatus.SC_OK) {
	            BufferedReader br = new BufferedReader(new InputStreamReader( method.getResponseBodyAsStream()));
				String line = null;
				StringBuffer respBuf = new StringBuffer();
				while ((line = br.readLine()) != null) {
				    respBuf.append(line);
				}
				responseBody = respBuf.toString();
	        }    
	    }catch (Exception e) {
	    	logger.error(e);
	    } finally {
	        method.releaseConnection();
	    }
	    
	    return responseBody;
    }

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