我使用AXIS 2生成了一个Web服务，但在测试时我看到了这个错误：
org.apache.axis2.AxisFault: 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
你能帮我解决这个问题吗？