Jenkins自动化UI测试Tomcat报错“The web application [/jenkins] appears to have started a thread named”解决办法

警告: Process leaked file descriptors. See https://jenkins.io/redirect/troubleshooting/process-leaked-file-descriptors for more information
java.lang.Exception
    at hudson.Proc$LocalProc.join(Proc.java:335)
    at hudson.tasks.CommandInterpreter.join(CommandInterpreter.java:155)
    at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:109)
    at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:66)
    at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
    at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)
    at hudson.model.Build$BuildExecution.build(Build.java:206)
    at hudson.model.Build$BuildExecution.doRun(Build.java:163)
    at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
    at hudson.model.Run.execute(Run.java:1818)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
    at hudson.model.ResourceController.execute(ResourceController.java:97)
    at hudson.model.Executor.run(Executor.java:429)

严重: The web application [/jenkins] appears to have started a thread named [Download metadata thread] but has failed to stop it. This is very 
likely to create a memory leak.