在我们的Debian Jessie盒子上，我们的Jenkins才自动从2.210升级到2.211，然后又升级到2.212。大约在同一时间，我们的JDK也从openjdk-7-jre-headless：amd64 7u231-2.6.19-1〜deb8u2升级到7u241-2.6.20-1〜deb8u1。从那时起，詹金斯（Jenkins）将无法启动，并且我们的日志中出现以下错误：
2020-01-06 15:23:00.257+0000 [id=21] INFO winstone.Logger#logInternal: JVM is terminating. Shutting down Jetty
Running from: /usr/share/jenkins/jenkins.war
2020-01-06 15:23:01.835+0000 [id=1] INFO org.eclipse.jetty.util.log.Log#initialized: Logging initialized @432ms to org.eclipse.jetty.util.log.JavaUtilLog
2020-01-06 15:23:02.007+0000 [id=1] INFO winstone.Logger#logInternal: Beginning extraction from war file
2020-01-06 15:23:02.053+0000 [id=1] WARNING o.e.j.s.handler.ContextHandler#setContextPath: Empty contextPath
2020-01-06 15:23:02.143+0000 [id=1] INFO org.eclipse.jetty.server.Server#doStart: jetty-9.4.22.v20191022; built: 2019-10-22T13:37:13.455Z; git: b1e6b55512e008f7fbdf1cbea4ff8a6446d1073b; jvm 1.8.0_131-8u131-b11-1~bpo8+1-b11
2020-01-06 15:23:02.401+0000 [id=1] INFO org.eclipse.jetty.util.TypeUtil#<clinit>: JVM Runtime does not support Modules
2020-01-06 15:23:02.419+0000 [id=1] INFO o.e.j.w.StandardDescriptorProcessor#visitServlet: NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
2020-01-06 15:23:02.469+0000 [id=1] INFO o.e.j.s.s.DefaultSessionIdManager#doStart: DefaultSessionIdManager workerName=node0
2020-01-06 15:23:02.470+0000 [id=1] INFO o.e.j.s.s.DefaultSessionIdManager#doStart: No SessionScavenger set, using defaults
2020-01-06 15:23:02.473+0000 [id=1] INFO o.e.j.server.session.HouseKeeper#startScavenging: node0 Scavenging every 660000ms
2020-01-06 15:23:02.800+0000 [id=1] INFO hudson.WebAppMain#contextInitialized: Jenkins home directory: /var/lib/jenkins found at: EnvVars.masterEnvVars.get("JENKINS_HOME")
2020-01-06 15:23:02.909+0000 [id=1] INFO o.e.j.s.handler.ContextHandler#doStart: Started w.@4bff7da0{Jenkins v2.212,/,file:///var/cache/jenkins/war/,AVAILABLE}{/var/cache/jenkins/war}
2020-01-06 15:23:02.925+0000 [id=1] INFO o.e.j.server.AbstractConnector#doStart: Started ServerConnector@531be3c5{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
2020-01-06 15:23:02.925+0000 [id=1] INFO org.eclipse.jetty.server.Server#doStart: Started @1522ms
2020-01-06 15:23:02.926+0000 [id=20] INFO winstone.Logger#logInternal: Winstone Servlet Engine running: controlPort=disabled
2020-01-06 15:23:04.238+0000 [id=27] INFO jenkins.InitReactorRunner$1#onAttained: Started initialization
2020-01-06 15:23:04.901+0000 [id=26] INFO jenkins.InitReactorRunner$1#onAttained: Listed all plugins
2020-01-06 15:23:07.057+0000 [id=28] WARNING hudson.ExtensionFinder$Sezpoz#scout: Failed to scout io.jenkins.blueocean.service.embedded.analytics.BrowserAndOperatingSystemAnalyticsProperties
java.io.IOException: Stream closed
at java.io.PushbackInputStream.ensureOpen(PushbackInputStream.java:74)
at java.io.PushbackInputStream.read(PushbackInputStream.java:166)
at org.yaml.snakeyaml.reader.UnicodeReader.init(UnicodeReader.java:88)
at org.yaml.snakeyaml.reader.UnicodeReader.read(UnicodeReader.java:118)
at java.io.Reader.read(Reader.java:140)
at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:182)
Caused: org.yaml.snakeyaml.error.YAMLException
at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:198)
at org.yaml.snakeyaml.reader.StreamReader.<init>(StreamReader.java:62)
at org.yaml.snakeyaml.Yaml.load(Yaml.java:411)
at ua_parser.Parser.initialize(Parser.java:69)
at ua_parser.Parser.<init>(Parser.java:44)
at ua_parser.Parser.<init>(Parser.java:40)
at io.jenkins.blueocean.service.embedded.analytics.BrowserAndOperatingSystemAnalyticsProperties.<clinit>(BrowserAndOperatingSystemAnalyticsProperties.java:29)
Caused: java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at hudson.ExtensionFinder$Sezpoz.scout(ExtensionFinder.java:738)
at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:338)
at hudson.ExtensionList.load(ExtensionList.java:381)
at hudson.ExtensionList.ensureLoaded(ExtensionList.java:317)
at hudson.ExtensionList.getComponents(ExtensionList.java:183)
at jenkins.model.Jenkins$6.onInitMilestoneAttained(Jenkins.java:1172)
at jenkins.InitReactorRunner$1.onAttained(InitReactorRunner.java:83)
at org.jvnet.hudson.reactor.ReactorListener$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 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
由于我对Jenkins sysadmin不太熟悉（我从离开的同事那里接管了Jenkins系统管理），所以我不知道如何解决此问题。有什么建议吗？