1.0-beta-30 upgraded Jenkins Core to 2.303.1 that excluded the SSHD Module and converted it to a plugin. It impacted the Git Server plugin that it is transiently loaded by the Pipeline: Global Libraries plugin. https://github.com/jenkinsci/git-server-plugin/pull/24 fixes it in 1.10, but apparently 1.9 is bundled in Jenkinsfile Runner Vanilla Package
2021-10-17 12:57:07.537+0000 [id=585] WARNING hudson.ExtensionFinder$Sezpoz#_find: Failed to load org.jenkinsci.plugins.gitserver.ssh.SshCommandFactoryImpl
java.lang.ClassNotFoundException: org.jenkinsci.main.modules.sshd.SshCommandFactory
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
Caused: java.lang.NoClassDefFoundError: org/jenkinsci/main/modules/sshd/SshCommandFactory
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:800)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:698)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:621)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:576)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at net.java.sezpoz.IndexItem.element(IndexItem.java:134)
Caused: java.lang.InstantiationException
at net.java.sezpoz.IndexItem.element(IndexItem.java:146)
at hudson.ExtensionFinder.getClassFromIndex(ExtensionFinder.java:738)
at hudson.ExtensionFinder.access$900(ExtensionFinder.java:88)
at hudson.ExtensionFinder$Sezpoz._find(ExtensionFinder.java:698)
at hudson.ExtensionFinder$Sezpoz.find(ExtensionFinder.java:687)
at hudson.ExtensionFinder$GuiceFinder.refreshExtensionAnnotations(ExtensionFinder.java:301)
at hudson.ExtensionFinder$GuiceFinder.<init>(ExtensionFinder.java:263)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at java.base/java.lang.Class.newInstance(Class.java:584)
at net.java.sezpoz.IndexItem.instance(IndexItem.java:181)
at hudson.ExtensionFinder$Sezpoz._find(ExtensionFinder.java:701)
at hudson.ExtensionFinder$Sezpoz.find(ExtensionFinder.java:687)
at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:348)
at hudson.ExtensionList.load(ExtensionList.java:380)
at hudson.ExtensionList.ensureLoaded(ExtensionList.java:316)
at hudson.ExtensionList.getComponents(ExtensionList.java:182)
at jenkins.model.Jenkins$6.onInitMilestoneAttained(Jenkins.java:1159)
at jenkins.InitReactorRunner$1.onAttained(InitReactorRunner.java:88)
at org.jvnet.hudson.reactor.ReactorListener$Aggregator.lambda$onAttained$3(ReactorListener.java:102)
at org.jvnet.hudson.reactor.ReactorListener$Aggregator.run(ReactorListener.java:109)
at org.jvnet.hudson.reactor.ReactorListener$Aggregator.onAttained(ReactorListener.java:102)
at org.jvnet.hudson.reactor.Reactor$1.run(Reactor.java:177)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:68)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
1.0-beta-30 upgraded Jenkins Core to 2.303.1 that excluded the SSHD Module and converted it to a plugin. It impacted the Git Server plugin that it is transiently loaded by the Pipeline: Global Libraries plugin. https://github.com/jenkinsci/git-server-plugin/pull/24 fixes it in 1.10, but apparently 1.9 is bundled in Jenkinsfile Runner Vanilla Package