Launch Spring Sts 4.0.0  Eclipse - Install New software, give the below url https://download.jboss.org/jbosstools/photon/stable/updates/   Following are the different errors  1) PKIX Certificate Issue      - Resolved by taking Certificate imported into JDK used by eclipse  2) Error now comes     at HTTP Server Unknown HTTP Response Code (301): http://download.jboss.org/jbosstools/photon/stable/updates/content.xml  org.eclipse.equinox.internal.p2.metadata.repository.SimpleMetadataRepositoryFactory.getLocalFile(SimpleMetadataRepositoryFactory.java:69)     at org.eclipse.equinox.internal.p2.metadata.repository.SimpleMetadataRepositoryFactory.load(SimpleMetadataRepositoryFactory.java:89)     at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.factoryLoad(MetadataRepositoryManager.java:63)     spring sts .ini file content   -startup plugins/org.eclipse.equinox.launcher_1.5.100.v20180827-1352.jar --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.800.v20180827-1352 -product org.springframework.boot.ide.branding.sts4 -Dorg.eclipse.ecf.provider.filetransfer.excludeContributors=org.eclipse.ecf.provider.filetransfer.httpclient4 --launcher.defaultAction openFile -vm C:\home\project\apps\jdk1.8.0_191\bin\javaw.exe -vmargs -Dosgi.requiredJavaVersion=1.8 --add-modules=ALL-SYSTEM -Xms40m -Xmx1200m -Dorg.eclipse.ecf.provider.filetransfer.excludeContributors=org.eclipse.ecf.provider.filetransfer.httpclient45,org.eclipse.ecf.provider.filetransfer.httpclient4 -Djavax.net.ssl.trustStore=C:\home\project\apps\jdk1.8.0_191\bin\jre\lib\security\cacerts -Djavax.net.ssl.trustStorePassword=changeit --add-modules=ALL-SYSTEM