title: Java Web Services
body: <p>I have a really basic question. I am new at Java WebServices. I want to use webservices to getting file names on server so I wrote below code; but I got an exception. Where is the mistake?</p>
  
  <p>package gungor.webWord;</p>
  
  <pre><code>import java.io.File;
  import javax.jws.WebService;
  import javax.jws.WebMethod;
  import javax.jws.WebParam;
  
  @WebService(serviceName = "webWordWebService")
  public class webWordWebService {
  
      /** This is a sample web service operation */
      @WebMethod(operationName = "hello")
      public String hello(@WebParam(name = "name") String txt) {
          return "Hello " + txt + " !";
      }
  
      /**
      * Web service operation
      */
      @WebMethod(operationName = "getFileNames")
      public String[] getFileNames(@WebParam(name = "parameter") java.lang.String path) {
          File dir=new File(path);
          String files[]=dir.list();
          String fileNames[]={""};
          int j=0;
          for (int i = 0; i &lt; files.length; i++) {
              if(!files[i].startsWith(".")){
                  fileNames[j]=files[i];
                  j++;
              }
          }
          return fileNames;
      }
  }
  </code></pre>
  
  <p>Exception</p>
  
  <pre><code>Service invocation threw an exception with message : null; Refer to the
  server log for more details
  
  
  Exceptions details : java.lang.reflect.InvocationTargetException
  
  javax.servlet.ServletException: java.lang.reflect.InvocationTargetException
  at org.glassfish.webservices.monitoring.WebServiceTesterServlet.doPost(WebServiceTesterServlet.java:330)
  at org.glassfish.webservices.monitoring.WebServiceTesterServlet.invoke(WebServiceTesterServlet.java:106)
  at org.glassfish.webservices.JAXWSServlet.doPost(JAXWSServlet.java:133)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
  at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
  at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
  at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
  at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
  at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
  at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)
  at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)
  at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)
  at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)
  at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)
  at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
  at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
  at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
  at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
  at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
  at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
  at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
  at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
  at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
  at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
  at java.lang.Thread.run(Thread.java:662) Caused by:
  java.lang.reflect.InvocationTargetException
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at org.glassfish.webservices.monitoring.WebServiceTesterServlet.doPost(WebServiceTesterServlet.java:301)
  ... 29 more Caused by: javax.xml.ws.soap.SOAPFaultException: 1
  at com.sun.xml.ws.fault.SOAP11Fault.getProtocolException(SOAP11Fault.java:193)
  at com.sun.xml.ws.fault.SOAPFaultBuilder.createException(SOAPFaultBuilder.java:134)
  at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:123)
  at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:93)
  at com.sun.xml.ws.client.sei.SEIStub.invoke(SEIStub.java:144)
  at $Proxy229.getFileNames(Unknown Source) ... 34 more Caused by:
  java.lang.ArrayIndexOutOfBoundsException: 1
  at gungor.webWord.webWordWebService.getFileNames(webWordWebService.java:37)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at org.glassfish.webservices.InstanceResolverImpl$1.invoke(InstanceResolverImpl.java:143)
  at com.sun.xml.ws.server.InvokerTube$2.invoke(InvokerTube.java:150)
  at com.sun.xml.ws.server.sei.EndpointMethodHandler.invoke(EndpointMethodHandler.java:261)
  at com.sun.xml.ws.server.sei.SEIInvokerTube.processRequest(SEIInvokerTube.java:100)
  at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:641)
  at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:600)
  at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:585)
  at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:482)
  at com.sun.xml.ws.api.pipe.helper.AbstractTubeImpl.process(AbstractTubeImpl.java:116)
  at org.glassfish.webservices.MonitoringPipe.process(MonitoringPipe.java:142)
  at com.sun.xml.ws.api.pipe.helper.PipeAdapter.processRequest(PipeAdapter.java:119)
  at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:641)
  at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:600)
  at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:585)
  at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:482)
  at com.sun.xml.ws.api.pipe.helper.AbstractTubeImpl.process(AbstractTubeImpl.java:116)
  at com.sun.enterprise.security.webservices.CommonServerSecurityPipe.processRequest(CommonServerSecurityPipe.java:212)
  at com.sun.enterprise.security.webservices.CommonServerSecurityPipe.process(CommonServerSecurityPipe.java:144)
  at com.sun.xml.ws.api.pipe.helper.PipeAdapter.processRequest(PipeAdapter.java:119)
  at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:641)
  at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:600)
  at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:585)
  at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:482)
  at com.sun.xml.ws.server.WSEndpointImpl$2.process(WSEndpointImpl.java:314)
  at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:608)
  at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:259)
  at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:162)
  at org.glassfish.webservices.JAXWSServlet.doPost(JAXWSServlet.java:145) ... 27 more
  </code></pre>