[InvalidSObjectFault [ApiQueryFault [ApiFault  exceptionCode='INVALID_TYPE'
exceptionMessage='Must send a concrete entity type.'
]
row='-1'
column='-1'
]
]

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.sforce.ws.bind.TypeMapper.readSingle(TypeMapper.java:628)
at com.sforce.ws.bind.TypeMapper.readObject(TypeMapper.java:505)
at com.sforce.ws.transport.SoapConnection.parseDetail(SoapConnection.java:228)
at com.sforce.ws.transport.SoapConnection.createException(SoapConnection.java:202)
at com.sforce.ws.transport.SoapConnection.receive(SoapConnection.java:148)
at com.sforce.ws.transport.SoapConnection.send(SoapConnection.java:110)
at com.sforce.soap.enterprise.EnterpriseConnection.update(EnterpriseConnection.java:938)
at com.agc.AGCMiddleware.getExchangeRate(AGCMiddleware.java:1100)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212)
at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:117)
at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:114)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
at org.apache.axis2.transport.http.util.RESTUtil.invokeAxisEngine(RESTUtil.java:144)
at org.apache.axis2.transport.http.util.RESTUtil.processURLRequest(RESTUtil.java:139)
at org.apache.axis2.transport.http.AxisServlet$RestRequestProcessor.processURLRequest(AxisServlet.java:837)
at org.apache.axis2.transport.http.AxisServlet.doGet(AxisServlet.java:273)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)

My Code : 

System.out.println("Update the DatedConversionRate In Salesforce...");
      DatedConversionRate[] records = new DatedConversionRate[100];
      //SObject[] records = new SObject[100];
      try {
      QueryResult queryResults = connection.query("SELECT Id,ConversionRate,IsoCode,StartDate FROM DatedConversionRate");
      System.out.println("Number Of Records : "+queryResults.getRecords().length);
      if (queryResults.getSize() > 0) {
      for (int i=0;i<queryResults.getRecords().length;i++)
      {
      DatedConversionRate a = (DatedConversionRate)queryResults.getRecords()[i];
      System.out.println("Updating Id: " + a.getId() + " - IsoCode: "+a.getIsoCode());
      //a.setConversionRate(65.00);
      System.out.println("I : "+i);
      records[i] = new DatedConversionRate();
      //records[i].setConversionRate(a.getConversionRate());
      records[i].setConversionRate(65.22);
      records[i].setId(a.getId());
      SaveResult[] saveResults = connection.update(records);
      System.out.println("Record updated");
     
      }
      }
 
      } catch (Exception e) {
      e.printStackTrace();
      }

I have integreted salesforce and Java using SOAP web service. Uploaded WSDL file in salesforce,created stub to access wsdl generated apex classes.It works fine but some times it gives me the excetion System.CalloutException: IO Exception: Unable to tunnel through proxy. Proxy returns "HTTP/1.0 404 Not Found" .PLZ suggest me some solution.

I have integreted salesforce and Java using SOAP web service. Uploaded WSDL file in salesforce,created stub to access wsdl generated apex classes.It works fine but some times it gives me the excetion System.CalloutException: IO Exception: Unable to tunnel through proxy. Proxy returns "HTTP/1.0 404 Not Found" .PLZ suggest me some solution.