Vaadin 14 - 问题无法调用“com.vaadin.flow.di.Lookup.lookup(java.lang.Class)”因为“查找”为空

Question

我有一个 Vaadin 14.7.5 应用程序在 CentOS Linux 版本 7.8.2003（核心）VPS 上运行良好，该 VPS 部署在运行 Java 17+35-LTS-2724 的 Tomcat 8.5.39 上。

出现以下错误：

09-Mar-2022 10:44:27.899 SEVERE [http-nio-127.0.0.1-8080-exec-2] org.apache.catalina.core.StandardWrapperValve.invoke Allocate exception for servlet [ServletStart]
 java.lang.NullPointerException: Cannot invoke "com.vaadin.flow.di.Lookup.lookup(java.lang.Class)" because "lookup" is null
        at com.vaadin.flow.server.DeploymentConfigurationFactory.getTokenFileFromClassloader(DeploymentConfigurationFactory.java:341)
        at com.vaadin.flow.server.DeploymentConfigurationFactory.getTokenFileContents(DeploymentConfigurationFactory.java:311)
        at com.vaadin.flow.server.DeploymentConfigurationFactory.readBuildInfo(DeploymentConfigurationFactory.java:181)
        at com.vaadin.flow.server.DeploymentConfigurationFactory.createInitParameters(DeploymentConfigurationFactory.java:174)
        at com.vaadin.flow.server.VaadinServlet.createDeploymentConfiguration(VaadinServlet.java:152)
        at com.vaadin.flow.server.VaadinServlet.createServletService(VaadinServlet.java:190)
        at com.vaadin.flow.server.VaadinServlet.init(VaadinServlet.java:77)
        at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1144)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1091)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:773)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:134)
        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.valves.RemoteIpValve.invoke(RemoteIpValve.java:679)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:660)
        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$ConnectionHandler.process(AbstractProtocol.java:806)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.base/java.lang.Thread.run(Thread.java:833)

但是，当我将相同的应用程序部署到运行 Java 17.0.2+8-LTS-86 的 Tomcat 8.5.39 或 8.5.72 上新创建的 CentOS Linux 版本 7.9.2009（核心）VPS 时， 知道发生了什么事吗？部署本身运行良好，但是在第一次打开 Web 应用程序时，我在 localhost 文件中收到此错误。

非常感谢您给出的答案。

问候， 帕特里克