Hello
I m new Jenkins. Installed Jenkins to learn a few things about it. I followed 
the instructions as described here,
https://www.tutorialspoint.com/jenkins/jenkins_tomcat_setup.htm
Installed Jenkins and TomCat 7 as perr the instructions and ran the startup.bat 
file, after copying Jenkins.war in 
C:\Users\<myName>\Downloads\apache-tomcat-7.0.79-windows-x86\apache-tomcat-7.0.79\webapps
 folder.
Also created a new environment variable for java, JAVA_HOME with the path for 
Java.
As soon as I opened the local address to see if Jenkins can access Tomcat, I 
got this error,
http://localhost:8080/jenkins

Please guide me where it went wrong,

//************************************************************************

A problem occurred while processing the request. Please check our bug 
tracker<https://jenkins.io/redirect/issue-tracker> to see if a similar problem 
has already been reported. If it is already reported, please vote and put a 
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new issue, please file a new issue. When you file an issue, make sure to add 
the entire stack trace, along with the version of Jenkins and relevant plugins. 
The users list<https://jenkins.io/redirect/users-mailing-list> might be also 
useful in understanding what has happened.

Stack trace

java.lang.AssertionError: InstanceIdentity is missing its singleton

    at 
org.jenkinsci.main.modules.instance_identity.InstanceIdentity.get(InstanceIdentity.java:133)

    at 
org.jenkinsci.main.modules.instance_identity.InstanceIdentityRSAProvider.getKeyPair(InstanceIdentityRSAProvider.java:23)

    at 
jenkins.model.identity.InstanceIdentityProvider$KeyTypes.get(InstanceIdentityProvider.java:161)

    at 
jenkins.model.identity.InstanceIdentityProvider$KeyTypes.getKeyPair(InstanceIdentityProvider.java:210)

    at 
jenkins.model.identity.IdentityRootAction.getUrlName(IdentityRootAction.java:42)

    at jenkins.model.Jenkins.getUnprotectedRootActions(Jenkins.java:4672)

    at 
jenkins.model.Jenkins.isSubjectToMandatoryReadPermissionCheck(Jenkins.java:4644)

    at jenkins.model.Jenkins.getTarget(Jenkins.java:4622)

    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:674)

    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)

    at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)

    at org.kohsuke.stapler.Stapler.service(Stapler.java:238)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)

    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)

    at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)

    at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135)

    at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:138)

    at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)

    at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:86)

    at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)

    at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)

    at 
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)

    at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

    at 
jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)

    at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

    at 
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)

    at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

    at 
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:135)

    at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

    at 
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)

    at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

    at 
jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:92)

    at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

    at 
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)

    at 
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)

    at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)

    at 
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90)

    at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)

    at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)

    at 
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)

    at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)

    at 
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)

    at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)

    at 
org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)

    at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)

    at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)

    at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)

    at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)

    at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)

    at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)

    at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)

    at 
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)

    at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)

    at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)

    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)

    at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)

    at 
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)

    at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)

    at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)

    at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)

    at org.eclipse.jetty.server.Server.handle(Server.java:564)

    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:317)

    at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)

    at 
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)

    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)

    at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)

    at 
org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:128)

    at 
org.eclipse.jetty.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222)

    at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294)

    at 
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:199)

    at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

    at java.lang.Thread.run(Unknown Source)
//*******************************************************************************


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