Java MDFe Erro

org.apache.axis2.AxisFault: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430)
    at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:78)
    at org.apache.axis2.transport.http.AxisRequestEntity.writeRequest(AxisRequestEntity.java:84)
    at org.apache.commons.httpclient.methods.EntityEnclosingMethod.writeRequestBody(EntityEnclosingMethod.java:499)
    at org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:2114)
    at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1096)
    at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
    at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
    at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
    at org.apache.axis2.transport.http.AbstractHTTPSender.executeMethod(AbstractHTTPSender.java:621)
    at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:193)
    at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:75)
    at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:404)
    at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:231)
    at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:443)
    at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:406)
    at org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:229)
    at org.apache.axis2.client.OperationClient.execute(OperationClient.java:165)
    at br.inf.portalfiscal.www.mdfe.wsdl.mdferecepcao.MDFeRecepcaoStub.mdfeRecepcaoLote(MDFeRecepcaoStub.java:208)
    at br.inf.portalfiscal.www.nfe.wsdl.action.MDFeAcoes.enviarMDFe(MDFeAcoes.java:622)
    at telas.TelaSimples.main(TelaSimples.java:606)
Caused by: com.ctc.wstx.exc.WstxIOException: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at com.ctc.wstx.sw.BaseStreamWriter.finishDocument(BaseStreamWriter.java:1692)
    at com.ctc.wstx.sw.BaseStreamWriter.close(BaseStreamWriter.java:288)
    at org.apache.axiom.util.stax.wrapper.XMLStreamWriterWrapper.close(XMLStreamWriterWrapper.java:46)
    at org.apache.axiom.om.impl.MTOMXMLStreamWriter.close(MTOMXMLStreamWriter.java:222)
    at org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:192)
    at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:74)
    ... 19 more
Caused by: javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.ssl.SSLSocketImpl.checkEOF(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.checkWrite(Unknown Source)
    at sun.security.ssl.AppOutputStream.write(Unknown Source)
    at java.io.BufferedOutputStream.flushBuffer(Unknown Source)
    at java.io.BufferedOutputStream.write(Unknown Source)
    at org.apache.commons.httpclient.WireLogOutputStream.write(WireLogOutputStream.java:68)
    at org.apache.commons.httpclient.ChunkedOutputStream.flushCacheWithAppend(ChunkedOutputStream.java:121)
    at org.apache.commons.httpclient.ChunkedOutputStream.write(ChunkedOutputStream.java:179)
    at com.ctc.wstx.io.UTF8Writer.write(UTF8Writer.java:139)
    at com.ctc.wstx.sw.BufferingXmlWriter.flushBuffer(BufferingXmlWriter.java:1103)
    at com.ctc.wstx.sw.BufferingXmlWriter.flush(BufferingXmlWriter.java:213)
    at com.ctc.wstx.sw.BufferingXmlWriter.close(BufferingXmlWriter.java:194)
    at com.ctc.wstx.sw.BaseStreamWriter.finishDocument(BaseStreamWriter.java:1690)
    ... 24 more
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.ssl.Alerts.getSSLException(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
    at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
    at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
    at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
    at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
    at sun.security.ssl.Handshaker.processLoop(Unknown Source)
    at sun.security.ssl.Handshaker.process_record(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
    at sun.security.ssl.SSLSocketImpl.writeRecord(Unknown Source)
    at sun.security.ssl.AppOutputStream.write(Unknown Source)
    at java.io.BufferedOutputStream.flushBuffer(Unknown Source)
    at java.io.BufferedOutputStream.write(Unknown Source)
    at org.apache.commons.httpclient.WireLogOutputStream.write(WireLogOutputStream.java:68)
    at org.apache.commons.httpclient.ChunkedOutputStream.flushCacheWithAppend(ChunkedOutputStream.java:121)
    at org.apache.commons.httpclient.ChunkedOutputStream.write(ChunkedOutputStream.java:179)
    at com.ctc.wstx.io.UTF8Writer.write(UTF8Writer.java:139)
    at com.ctc.wstx.sw.BufferingXmlWriter.writeRaw(BufferingXmlWriter.java:259)
    at com.ctc.wstx.sw.BufferingXmlWriter.writeCharacters(BufferingXmlWriter.java:543)
    at com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:509)
    at org.apache.axiom.util.stax.wrapper.XMLStreamWriterWrapper.writeCharacters(XMLStreamWriterWrapper.java:100)
    at org.apache.axiom.om.impl.MTOMXMLStreamWriter.writeCharacters(MTOMXMLStreamWriter.java:325)
    at org.apache.axiom.om.impl.llom.OMTextImpl.writeOutput(OMTextImpl.java:249)
    at org.apache.axiom.om.impl.llom.OMTextImpl.internalSerialize(OMTextImpl.java:400)
    at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:556)
    at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:846)
    at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:556)
    at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:846)
    at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:556)
    at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:846)
    at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:556)
    at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:846)
    at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:556)
    at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:846)
    at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:556)
    at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:846)
    at org.apache.axiom.om.impl.llom.OMSerializableImpl.serialize(OMSerializableImpl.java:120)
    at org.apache.axiom.om.impl.llom.OMSerializableImpl.serialize(OMSerializableImpl.java:108)
    at br.inf.portalfiscal.www.mdfe.wsdl.mdferecepcao.MDFeRecepcaoStub$MdfeDadosMsg.serialize(MDFeRecepcaoStub.java:1961)
    at br.inf.portalfiscal.www.mdfe.wsdl.mdferecepcao.MDFeRecepcaoStub$MdfeDadosMsg.serialize(MDFeRecepcaoStub.java:1923)
    at org.apache.axis2.databinding.ADBDataSource.serialize(ADBDataSource.java:90)
    at org.apache.axiom.om.impl.llom.OMSourcedElementImpl.internalSerialize(OMSourcedElementImpl.java:638)
    at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:563)
    at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:846)
    at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.serializeInternally(SOAPEnvelopeImpl.java:267)
    at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.internalSerialize(SOAPEnvelopeImpl.java:229)
    at org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:188)
    ... 20 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
    at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
    at sun.security.validator.Validator.validate(Unknown Source)
    at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source)
    at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
    at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
    ... 64 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    at sun.security.provider.certpath.SunCertPathBuilder.build(Unknown Source)
    at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
    at java.security.cert.CertPathBuilder.build(Unknown Source)
    ... 70 more