getting nullPointerException with commons-httpclient and EWSJavaAPI - web-services

Question

i am using EWS Java API 1.1.5
and i am trying to bind the service to inbox folder as follows:
ExchangeService service = new ExchangeService();
ExchangeCredentials credentials = new WebCredentials(email, password);
service.setCredentials(credentials);
service.setUrl(new java.net.URI("https://" + host
+ "/EWS/Exchange.asmx"));
Folder inbox = Folder.bind(service, WellKnownFolderName.Inbox);
i call the above code from jsp page.
but i am getting NullPointerException:
java.lang.NullPointerException
at org.apache.commons.httpclient.HttpMethodBase.getStatusCode(HttpMethodBase.java:570)
at microsoft.exchange.webservices.data.HttpClientWebRequest.getResponseCode(Unknown Source)
at microsoft.exchange.webservices.data.ServiceRequestBase.validateAndEmitRequest(Unknown Source)
at microsoft.exchange.webservices.data.SimpleServiceRequestBase.internalExecute(Unknown Source)
at microsoft.exchange.webservices.data.MultiResponseServiceRequest.execute(Unknown Source)
at microsoft.exchange.webservices.data.ExchangeService.bindToFolder(Unknown Source)
at microsoft.exchange.webservices.data.ExchangeService.bindToFolder(Unknown Source)
at microsoft.exchange.webservices.data.Folder.bind(Unknown Source)
at microsoft.exchange.webservices.data.Folder.bind(Unknown Source)
at com.xeno.phonesuite.web.Mail.Mail.readInbox(Mail.java:49)
at org.apache.jsp.mail.inbox_jsp._jspService(inbox_jsp.java:79)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
i am using commons-httpclient 3.1.
this exception occurs when running the code from a web project that runs on tomcat 7, but when running the code from desktop application it works fine.
UPDATE:
1- httpclient debugs before exception:
2012-11-07/16:37:32.425 [http-bio-8080-exec-2] DEBUG Set parameter http.auth.scheme-priority = [NTLM, Basic, Digest]
2012-11-07/16:37:32.425 [http-bio-8080-exec-2] DEBUG enter HttpState.setCredentials(AuthScope, Credentials)
2012-11-07/16:37:32.425 [http-bio-8080-exec-2] DEBUG Set parameter http.socket.timeout = 100000
2012-11-07/16:37:32.425 [http-bio-8080-exec-2] DEBUG Set parameter http.connection.timeout = 100000
2012-11-07/16:37:32.425 [http-bio-8080-exec-2] DEBUG enter PostMethod.clearRequestBody()
2012-11-07/16:37:32.425 [http-bio-8080-exec-2] DEBUG enter EntityEnclosingMethod.clearRequestBody()
2- EWS trace before exception:
<Trace Tag="EwsRequestHttpHeaders" Tid="33" Time="2012-11-07 15:14:24Z">
POST /EWS/Exchange.asmx HTTP/1.1
Content-type : text/xml; charset=utf-8
Accept-Encoding : gzip,deflate
Keep-Alive : 300
User-Agent : ExchangeServicesClient/0.0.0.0
Connection : Keep-Alive
Accept : text/xml
</Trace>
and its supposed to send then the following request:
<Trace Tag="EwsRequest" Tid="1" Time="2012-11-07 15:18:19Z">
<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types"><soap:Header><t:RequestServerVersion Version="Exchange2010_SP1"></t:RequestServerVersion></soap:Header><soap:Body><m:FindItem Traversal="Shallow"><m:ItemShape><t:BaseShape>AllProperties</t:BaseShape></m:ItemShape><m:IndexedPageItemView MaxEntriesReturned="5" Offset="0" BasePoint="Beginning"></m:IndexedPageItemView><m:ParentFolderIds><t:DistinguishedFolderId Id="inbox"></t:DistinguishedFolderId></m:ParentFolderIds></m:FindItem></soap:Body></soap:Envelope>
</Trace>
but it doesn't, and it throws the exception instead.
UPDATE2: forgot to mention that i am using Cisco jtapi 6.1 library for dealing with IP phones, and after googling i found that the following issue is resolved in latest version of jtapi:
CSCtz31973 : Ews request printed is Null in case of StreamingSubscriptionRequest
what i understand is that the EWS requests is null (cannot send microsoft webservices requests), so i will update the jtapi library and give it a try.
please advise how to fix it.

Answer 1

Problem solved after upgrading the jars for jaxws-rt and saaj-api as follows:
<dependency>
<groupId>com.sun.xml.ws</groupId>
<artifactId>jaxws-rt</artifactId>
<version>2.2.7</version>
</dependency>
<dependency>
<groupId>javax.xml.soap</groupId>
<artifactId>saaj-api</artifactId>
<version>1.3.4</version>
</dependency>