英文:
Error on start of Spring Boot Application (Vaadin)
问题
我尝试更改了 Spring Boot 应用程序的端口，激活了 Vaadin PRO，在 Eclipse/PowerShell 中运行，有和没有调试模式运行... 我也安装了 Node.js 12.16.1（包括 npm 6.13.4）。我始终会遇到以下错误：
java.lang.RuntimeException: 无法初始化 Vaadin DevModeHandler
:: Spring Boot :: (v2.2.4.RELEASE)
2020-03-16 07:34:43.681 INFO 12284 --- [ main] s.q.myapp.ui.MyAppWebApplication : 在 luigi10 上以 PID 12284 启动 MyAppWebApplication（C:\Workspaces\myapp\myapp\myapp-web\target\classes，在 C:\Workspaces\myapp\myapp\myapp-web 中的 luigi.k 开始）
...
2020-03-16 07:34:47.156 INFO 12284 --- [ main] dev-updater : 跳过 `npm install`。
...
2020-03-16 07:34:50.444 ERROR 12284 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : 初始化上下文初始化事件到类 [com.vaadin.flow.spring.VaadinServletContextInitializer$DevModeServletContextListener] 的监听器实例时出现异常
...
2020-03-16 07:34:50.675 WARN 12284 --- [ main] o.a.c.loader.WebappClassLoaderBase : Web 应用程序 [ROOT] 似乎已启动了名为 [Thread-1] 的线程，但未能停止它。这很可能会导致内存泄漏。线程的堆栈跟踪：
...
2020-03-16 07:34:50.669 INFO 12284 --- [ main] o.apache.catalina.core.StandardService : 停止服务 [Tomcat]
...
2020-03-16 07:34:50.684 INFO 12284 --- [ main] ConditionEvaluationReportLoggingListener :
ApplicationContextException。要显示条件报告，请使用启用了“debug”的应用程序重新运行。
2020-03-16 07:34:50.693 ERROR 12284 --- [ main] o.s.boot.SpringApplication : 应用程序运行失败
ApplicationContextException：无法启动 Web 服务器；嵌入式 Tomcat 启动失败
...
Caused by: java.lang.IllegalStateException: StandardEngine[Tomcat].StandardHost[localhost].TomcatEmbeddedContext[] 启动失败
...
pom.xml：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.corp</groupId>
<artifactId>myapp-web</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>myapp-web</name>
<description>WEB for MyApp</description>
<properties>
<java.version>11</java.version>
<vaadin.version>14.1.17</vaadin.version>
</properties>
<!-- ... -->
</project>
解决方案，适用于我的情况：我从 Git 检出了 node_modules 文件夹。我删除了文件夹 node_modules 中的所有模块以及文件 package-lock.json。然后我运行了 Spring Boot 应用程序，自动启动了 'npm install' 并生成了新的模块。应用程序成功启动。
英文:
I tried to change port of Spring Boot application, activated Vaadin PRO, run in Eclipse/PowerShell, run in debug and without debug... I have node.js 12.16.1 (includes npm 6.13.4) installed too. I always get an error:
java.lang.RuntimeException: Unable to initialize Vaadin DevModeHandler
:: Spring Boot :: (v2.2.4.RELEASE)
2020-03-16 07:34:43.681 INFO 12284 --- [ main] s.q.myapp.ui.MyAppWebApplication : Starting MyAppWebApplication on luigi10 with PID 12284 (C:\Workspaces\myapp\myapp\myapp-web\target\classes started by luigi.k in C:\Workspaces\myapp\myapp\myapp-web)
2020-03-16 07:34:43.684 INFO 12284 --- [ main] s.q.myapp.ui.MyAppWebApplication : No active profile set, falling back to default profiles: default
2020-03-16 07:34:44.734 INFO 12284 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8082 (http)
2020-03-16 07:34:44.744 INFO 12284 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-03-16 07:34:44.745 INFO 12284 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.30]
2020-03-16 07:34:44.936 INFO 12284 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-03-16 07:34:44.936 INFO 12284 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1210 ms
2020-03-16 07:34:47.109 INFO 12284 --- [ main] c.v.f.s.VaadinServletContextInitializer : Search for subclasses and classes with annotations took 1 seconds
2020-03-16 07:34:47.112 INFO 12284 --- [ main] c.v.f.server.startup.DevModeInitializer : Starting dev-mode updaters in C:\Workspaces\myapp\myapp\myapp-web folder.
2020-03-16 07:34:47.141 INFO 12284 --- [ main] dev-updater : Visited 122 classes. Took 19 ms.
2020-03-16 07:34:47.156 INFO 12284 --- [ main] dev-updater : Skipping `npm install`.
2020-03-16 07:34:47.156 INFO 12284 --- [ main] dev-updater : Copying frontend resources from jar files ...
2020-03-16 07:34:47.219 INFO 12284 --- [ main] dev-updater : Visited 12 resources. Took 63 ms.
2020-03-16 07:34:47.286 INFO 12284 --- [ main] dev-updater : Updated C:\Workspaces\myapp\myapp\myapp-web\target\frontend\generated-flow-imports.js
2020-03-16 07:34:49.562 INFO 12284 --- [ main] dev-webpack : Starting webpack-dev-server, port: 57479 dir: C:\Workspaces\myapp\myapp\myapp-web
2020-03-16 07:34:49.577 INFO 12284 --- [ main] dev-webpack : Running webpack to compile frontend resources. This may take a moment, please stand by...
2020-03-16 07:34:50.406 ERROR 12284 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Exception sending context initialized event to listener instance of class [com.vaadin.flow.spring.VaadinServletContextInitializer$DevModeServletContextListener]
java.lang.RuntimeException: Unable to initialize Vaadin DevModeHandler
at com.vaadin.flow.spring.VaadinServletContextInitializer$DevModeServletContextListener.contextInitialized(VaadinServletContextInitializer.java:347) ~[vaadin-spring-12.1.2.jar:na]
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4683) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5146) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na]
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na]
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.apache.catalina.startup.Tomcat.start(Tomcat.java:459) ~[tomcat-embed-core-9.0.30.jar:9.0.30]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:107) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:88) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:438) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at com.comp.myapp.ui.MyAppWebApplication.main(MyAppWebApplication.java:10) ~[classes/:na]
Caused by: javax.servlet.ServletException: java.lang.IllegalStateException: Webpack exited prematurely
at com.vaadin.flow.server.startup.DevModeInitializer.initDevModeHandler(DevModeInitializer.java:301) ~[flow-server-2.1.5.jar:2.1.5]
at com.vaadin.flow.spring.VaadinServletContextInitializer$DevModeServletContextListener.contextInitialized(VaadinServletContextInitializer.java:344) ~[vaadin-spring-12.1.2.jar:na]
... 38 common frames omitted
Caused by: java.lang.IllegalStateException: Webpack exited prematurely
at com.vaadin.flow.server.DevModeHandler.<init>(DevModeHandler.java:202) ~[flow-server-2.1.5.jar:2.1.5]
at com.vaadin.flow.server.DevModeHandler.createInstance(DevModeHandler.java:299) ~[flow-server-2.1.5.jar:2.1.5]
at com.vaadin.flow.server.DevModeHandler.start(DevModeHandler.java:249) ~[flow-server-2.1.5.jar:2.1.5]
at com.vaadin.flow.server.DevModeHandler.start(DevModeHandler.java:226) ~[flow-server-2.1.5.jar:2.1.5]
at com.vaadin.flow.server.startup.DevModeInitializer.initDevModeHandler(DevModeInitializer.java:297) ~[flow-server-2.1.5.jar:2.1.5]
... 39 common frames omitted
2020-03-16 07:34:50.444 ERROR 12284 --- [ main] o.apache.catalina.core.StandardContext : One or more listeners failed to start. Full details will be found in the appropriate container log file
2020-03-16 07:34:50.445 ERROR 12284 --- [ main] o.apache.catalina.core.StandardContext : Context [] startup failed due to previous errors
2020-03-16 07:34:50.453 WARN 12284 --- [ main] o.a.c.loader.WebappClassLoaderBase : The web application [ROOT] appears to have started a thread named [Thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@11.0.2/java.net.PlainSocketImpl.accept0(Native Method)
java.base@11.0.2/java.net.PlainSocketImpl.socketAccept(PlainSocketImpl.java:159)
java.base@11.0.2/java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:458)
java.base@11.0.2/java.net.ServerSocket.implAccept(ServerSocket.java:551)
java.base@11.0.2/java.net.ServerSocket.accept(ServerSocket.java:519)
app//com.vaadin.flow.server.DevServerWatchDog$WatchDogServer.run(DevServerWatchDog.java:58)
java.base@11.0.2/java.lang.Thread.run(Thread.java:834)
2020-03-16 07:34:50.669 INFO 12284 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2020-03-16 07:34:50.675 WARN 12284 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
2020-03-16 07:34:50.684 INFO 12284 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-03-16 07:34:50.693 ERROR 12284 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:156) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at com.comp.myapp.ui.MyAppWebApplication.main(MyAppWebApplication.java:10) ~[classes/:na]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:88) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:438) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
... 8 common frames omitted
Caused by: java.lang.IllegalStateException: StandardEngine[Tomcat].StandardHost[localhost].TomcatEmbeddedContext[] failed to start
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.rethrowDeferredStartupExceptions(TomcatWebServer.java:171) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:110) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE]
... 13 common frames omitted
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.corp</groupId>
<artifactId>myapp-web</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>myapp-web</name>
<description>WEB for MyApp</description>
<properties>
<java.version>11</java.version>
<vaadin.version>14.1.17</vaadin.version>
</properties>
<repositories>
<repository>
<id>central</id>
<url>https://repo.maven.apache.org/maven2</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
<repository>
<id>vaadin-addons</id>
<url>https://maven.vaadin.com/vaadin-addons</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-crud-flow</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin</artifactId>
<exclusions>
<exclusion>
<groupId>com.vaadin.webjar</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>org.webjars.bowergithub.insites</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>org.webjars.bowergithub.polymer</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>org.webjars.bowergithub.polymerelements</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>org.webjars.bowergithub.vaadin</groupId>
<artifactId>*</artifactId>
</exclusion>
<exclusion>
<groupId>org.webjars.bowergithub.webcomponents</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-bom</artifactId>
<version>${vaadin.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
The solution, that worked for me:
I had node_modules folder checkout from GIT. I deleted all modules from folder node_modules and file package-lock.json too. Then I ran Spring Boot application and automatically started 'npm install' and generated new modules. Application was starting without error.
答案1
得分: 5
运行mvn clean package -Pproduction，按照 Vaadin 文档进行操作。对我有效。
英文:
Run mvn clean package -Pproduction following by Vaadin documentation. It works for me.
答案2
得分: 3
运行 mvn clean install。这是使用Vaadin的基础操作。
如果你在开始使用Vaadin时遇到任何问题，请先重新构建项目。
英文:
Run mvn clean install. This is a basic of work with Vaadin.
If you have any problem with Vaadin at first rebuild the project.
答案3
得分: 0
如Piotr所述，mvn clean package -Pproduction是官方Vaadin文档中提到的命令，您可以在https://vaadin.com/docs/v14/flow/production/overview上找到有关如何构建用于生产的详细信息，包括使用Maven。
英文:
As Piotr said mvn clean package -Pproduction is cmd by official Vaadin docs and you can find details how to build for production including maven on https://vaadin.com/docs/v14/flow/production/overview
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