web services - AbstractMethodError: gov.nih.nlm.ncbi.www.soap.eutils.EUtilsServiceStub -

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web services - AbstractMethodError: gov.nih.nlm.ncbi.www.soap.eutils.EUtilsServiceStub -

everyone, i'm fresh man in building webservice applications. using this example access ncbi (national center biotechnology information) webservice api. getting error below when seek , access data.

does know how solve issue?

log4j:warn no appenders found logger (org.apache.axis2.description.axisoperation). log4j:warn please initialize log4j scheme properly. exception in thread "main" java.lang.abstractmethoderror: gov.nih.nlm.ncbi.www.soap.eutils.eutilsservicestub$egqueryrequest.serialize(ljavax/xml/namespace/qname;ljavax/xml/stream/xmlstreamwriter;)v @ org.apache.axis2.databinding.adbdatasource.serialize(adbdatasource.java:90) @ org.apache.axiom.om.impl.llom.omsourcedelementimpl.internalserialize(omsourcedelementimpl.java:695) @ org.apache.axiom.om.impl.util.omserializerutil.serializechildren(omserializerutil.java:563) @ org.apache.axiom.om.impl.llom.omelementimpl.internalserialize(omelementimpl.java:874) @ org.apache.axiom.soap.impl.llom.soapenvelopeimpl.serializeinternally(soapenvelopeimpl.java:283) @ org.apache.axiom.soap.impl.llom.soapenvelopeimpl.internalserialize(soapenvelopeimpl.java:245) @ org.apache.axiom.om.impl.llom.omserializableimpl.serializeandconsume(omserializableimpl.java:193) @ org.apache.axis2.transport.http.soapmessageformatter.writeto(soapmessageformatter.java:74) @ org.apache.axis2.transport.http.axisrequestentity.writerequest(axisrequestentity.java:84) @ org.apache.commons.httpclient.methods.entityenclosingmethod.writerequestbody(entityenclosingmethod.java:499) @ org.apache.commons.httpclient.httpmethodbase.writerequest(httpmethodbase.java:2114) @ org.apache.commons.httpclient.httpmethodbase.execute(httpmethodbase.java:1096) @ org.apache.commons.httpclient.httpmethoddirector.executewithretry(httpmethoddirector.java:398) @ org.apache.commons.httpclient.httpmethoddirector.executemethod(httpmethoddirector.java:171) @ org.apache.commons.httpclient.httpclient.executemethod(httpclient.java:397) @ org.apache.axis2.transport.http.abstracthttpsender.executemethod(abstracthttpsender.java:621) @ org.apache.axis2.transport.http.httpsender.sendviapost(httpsender.java:193) @ org.apache.axis2.transport.http.httpsender.send(httpsender.java:75) @ org.apache.axis2.transport.http.commonshttptransportsender.writemessagewithcommons(commonshttptransportsender.java:404) @ org.apache.axis2.transport.http.commonshttptransportsender.invoke(commonshttptransportsender.java:231) @ org.apache.axis2.engine.axisengine.send(axisengine.java:443) @ org.apache.axis2.description.outinaxisoperationclient.send(outinaxisoperation.java:406) @ org.apache.axis2.description.outinaxisoperationclient.executeimpl(outinaxisoperation.java:229) @ org.apache.axis2.client.operationclient.execute(operationclient.java:165) @ gov.nih.nlm.ncbi.www.soap.eutils.eutilsservicestub.run_egquery(eutilsservicestub.java:1578) @ edu.yale.pubmed.service.client.callegquery(client.java:26) @ edu.yale.pubmed.service.client.main(client.java:10)

use generated files in axis2 folder, can run sucessfully. result automatically implemented eutilsservicestub.

web-services serialization

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