The recommended git tool is: NONE
07:00:00 FATAL: org.jenkinsci.plugins.gitclient.GitClient
07:00:00 java.lang.NoClassDefFoundError: org.jenkinsci.plugins.gitclient.GitClient
07:00:00 at org.jenkinsci.plugins.gitclient.Git$GitAPIMasterToSlaveFileCallable.invoke(Git.java:168)
07:00:00 at org.jenkinsci.plugins.gitclient.Git$GitAPIMasterToSlaveFileCallable.invoke(Git.java:149)
07:00:00 at hudson.FilePath.act(FilePath.java:1172)
07:00:00 at hudson.FilePath.act(FilePath.java:1155)
07:00:00 at org.jenkinsci.plugins.gitclient.Git.getClient(Git.java:121)
07:00:00 at hudson.plugins.git.GitSCM.createClient(GitSCM.java:906)
07:00:00 at hudson.plugins.git.GitSCM.createClient(GitSCM.java:837)
07:00:00 at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1290)
07:00:00 at hudson.scm.SCM.checkout(SCM.java:505)
07:00:00 at hudson.model.AbstractProject.checkout(AbstractProject.java:1215)
reverting to 4.7.0 and it works again.
jenkins 2.290
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MortenB, Oslo, Norway