安裝eclipse外掛時會報如下錯誤：

An error occurred while collecting items to be installed session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=). Multiple problems occurred while downloading. Unable to read repository at http://download.eclipse.org/egit/updates/plugins/org.eclipse.egit.doc_4.10.0.201712302008-r.jar.pack.gz. sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target Unable to read repository at http://download.eclipse.org/egit/updates/plugins/org.eclipse.egit.doc_4.10.0.201712302008-r.jar. Read timed out Multiple problems occurred while downloading. Unable to read repository at http://download.eclipse.org/egit/updates/plugins/org.eclipse.egit.ui_4.10.0.201712302008-r.jar.pack.gz. sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target Unable to read repository at http://download.eclipse.org/egit/updates/plugins/org.eclipse.egit.ui_4.10.0.201712302008-r.jar. sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target Unable to read repository at http://download.eclipse.org/egit/updates/plugins/org.eclipse.jgit_4.10.0.201712302008-r.jar. sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target Unable to read repository at http://download.eclipse.org/egit/updates/plugins/org.eclipse.egit.core.source_4.10.0.201712302008-r.jar. Read timed out Unable to read repository at http://download.eclipse.org/egit/updates/plugins/org.eclipse.egit.ui.source_4.10.0.201712302008-r.jar. sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target Unable to read repository at http://download.eclipse.org/egit/updates/plugins/org.eclipse.jgit.source_4.10.0.201712302008-r.jar. sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target 解決辦法：安裝時去掉【Contact all update sites during install to find required software】的勾選即可