我正在尝试在VPS上创建FA的实例，并且遇到了问题。由于某些原因，在尝试启动维护模式后，应用程序在尝试启动时会引发此错误。我正在使用PostgreSQL;用户拥有所有必需的特权；我在任何地方都找不到任何有意义的错误日志。请帮助！
Feb 22, 2020 7:26:29.033 PM ERROR io.fusionauth.app.primeframework.error.ExceptionExceptionHandler - An unhandled exception was thrown
java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.FutureTask@21acde7d rejected from java.util.concurrent.ThreadPoolExecutor@d93535b[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 1]
at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2063)
at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830)
at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1379)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at java.util.concurrent.Executors$DelegatedExecutorService.submit(Executors.java:681)
at com.inversoft.maintenance.action.MaintenanceModeDoneAction.get(MaintenanceModeDoneAction.java:56)
at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.primeframework.mvc.util.ReflectionUtils.invoke(ReflectionUtils.java:414)
at org.primeframework.mvc.action.DefaultActionInvocationWorkflow.execute(DefaultActionInvocationWorkflow.java:79)
at org.primeframework.mvc.action.DefaultActionInvocationWorkflow.perform(DefaultActionInvocationWorkflow.java:62)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.validation.DefaultValidationWorkflow.perform(DefaultValidationWorkflow.java:47)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.security.DefaultSecurityWorkflow.perform(DefaultSecurityWorkflow.java:60)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.parameter.DefaultPostParameterWorkflow.perform(DefaultPostParameterWorkflow.java:50)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.content.DefaultContentWorkflow.perform(DefaultContentWorkflow.java:52)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.parameter.DefaultParameterWorkflow.perform(DefaultParameterWorkflow.java:57)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.parameter.DefaultURIParameterWorkflow.perform(DefaultURIParameterWorkflow.java:102)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.scope.DefaultScopeRetrievalWorkflow.perform(DefaultScopeRetrievalWorkflow.java:58)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.message.DefaultMessageWorkflow.perform(DefaultMessageWorkflow.java:45)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.action.DefaultActionMappingWorkflow.perform(DefaultActionMappingWorkflow.java:126)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.workflow.StaticResourceWorkflow.perform(StaticResourceWorkflow.java:97)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.parameter.RequestBodyWorkflow.perform(RequestBodyWorkflow.java:89)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.security.DefaultSavedRequestWorkflow.perform(DefaultSavedRequestWorkflow.java:57)
at org.primeframework.mvc.workflow.SubWorkflowChain.continueWorkflow(SubWorkflowChain.java:43)
at org.primeframework.mvc.workflow.DefaultMVCWorkflow.perform(DefaultMVCWorkflow.java:91)
at org.primeframework.mvc.workflow.DefaultWorkflowChain.continueWorkflow(DefaultWorkflowChain.java:44)
at org.primeframework.mvc.servlet.FilterWorkflowChain.continueWorkflow(FilterWorkflowChain.java:50)
at org.primeframework.mvc.servlet.PrimeFilter.doFilter(PrimeFilter.java:84)
at com.inversoft.maintenance.servlet.MaintenanceModePrimeFilter.doFilter(MaintenanceModePrimeFilter.java:59)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.inversoft.servlet.UTF8Filter.doFilter(UTF8Filter.java:27)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:808)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
我发现了问题。我的服务器上的Java版本过旧。只需使用您的软件包管理器/安装程序安装最新版本（例如yum，apt等），它就可以工作！