Unable to find valid certification path to requested target java soap. IO_ERROR (invoke PKIX path building failed: sun. java:174) Oct 14, 2025 ยท Learn step-by-step solutions to resolve the PKIX Path Building Failed error and restore secure SSL connections in your Java applications. security. PKIXValidator. build(SunCertPathBuilder. SunCertPathBuilder. Caused by: sun. provider. But, before we continue, you must clearly understand SSL encryption and Certificates since a clear understanding of SSL Certificates is required. engineBuild(SunCertPathBuilder.