Я попытался изменить порт приложения Spring Boot, активировал Vaadin PRO, запустил в Eclipse / PowerShell, запустил в режиме отладки и без отладки ... У меня установлен node.js 12.16.1 (включая npm 6.13.4) тоже. Я всегда получаю сообщение об ошибке: java .lang.RuntimeException: невозможно инициализировать 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>
Решение, которое сработало для меня: у меня была проверка папки node_modules от GIT. Я удалил все модули из папки node_modules и файла package-lock. json тоже. Затем я запустил приложение Spring Boot, автоматически запустил «npm install» и сгенерировал новые модули. Приложение запускалось без ошибок.