当我重新启动我的 Web 应用程序时，为什么在 Vaadin 14 会出现此错误？通知重新开始。不是从头开始。我的 Web 应用程序运行良好，并且在代码中没有出现任何错误。所以我不能告诉你问题出在哪里，只是我在启动时遇到错误。
我正在使用带有 Spring Boot 的 Vaadin 14，这从项目开始就一直存在。
我假设这与此有关
2020-04-03 19:45:52.551 WARN 12331 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Cannot deserialize session attribute [com.vaadin.flow.server.VaadinSession.springServlet] for session [5FA61268BB6EFA5428B0EE8C9E39E87A]
2020-04-03 19:45:52.579 ERROR 12331 --- [ restartedMain] o.a.catalina.session.StandardManager : Exception loading sessions from persistent storage
但我不知道这意味着什么。
java.io.InvalidClassException: java.util.Collections$UnmodifiableCollection; invalid descriptor for field c
at java.base/java.io.ObjectStreamClass.readNonProxy(ObjectStreamClass.java:797) ~[na:na]
at java.base/java.io.ObjectInputStream.readClassDescriptor(ObjectInputStream.java:936) ~[na:na]
at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1930) ~[na:na]
at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1827) ~[na:na]
at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1958) ~[na:na]
at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1827) ~[na:na]
at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2115) ~[na:na]
at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1646) ~[na:na]
at java.base/java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2410) ~[na:na]
at java.base/java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2304) ~[na:na]
at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2142) ~[na:na]
at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1646) ~[na:na]
at java.base/java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2410) ~[na:na]
at java.base/java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2304) ~[na:na]
at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2142) ~[na:na]
at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1646) ~[na:na]
at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:464) ~[na:na]
at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:422) ~[na:na]
at org.apache.catalina.session.StandardSession.doReadObject(StandardSession.java:1576) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.session.StandardSession.readObjectData(StandardSession.java:1048) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.session.StandardManager.doLoad(StandardManager.java:218) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.session.StandardManager.load(StandardManager.java:162) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.session.StandardManager.startInternal(StandardManager.java:354) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5163) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na]
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
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-9.0.27.jar:9.0.27]
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-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.apache.catalina.startup.Tomcat.start(Tomcat.java:459) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:107) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:88) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:438) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at se.spektrakon.hemsida.HemsidaApplication.main(HemsidaApplication.java:12) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.2.0.RELEASE.jar:2.2.0.RELEASE]
Caused by: java.lang.IllegalArgumentException: illegal signature
at java.base/java.io.ObjectStreamField.<init>(ObjectStreamField.java:124) ~[na:na]
at java.base/java.io.ObjectStreamClass.readNonProxy(ObjectStreamClass.java:795) ~[na:na]
... 65 common frames omitted
这是我的 pom.xml 文件
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>se.spektrakon.hemsida</groupId>
<artifactId>spektrakonhemsida</artifactId>
<name>SpektrakonHemsida</name>
<version>2.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<vaadin.version>14.1.19</vaadin.version>
<drivers.dir>${project.basedir}/drivers</drivers.dir>
<drivers.downloader.phase>pre-integration-test</drivers.downloader.phase>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.0.RELEASE</version>
</parent>
<repositories>
<!-- The order of definitions matters. Explicitly defining central here to make sure it has the highest priority. -->
<!-- Main Maven repository -->
<repository>
<id>central</id>
<url>https://repo.maven.apache.org/maven2</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
<!-- Repository used by many Vaadin add-ons -->
<repository>
<id>Vaadin Directory</id>
<url>https://maven.vaadin.com/vaadin-addons</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
<!-- For the Crud and message box-->
<repository>
<id>vaadin-addons</id>
<url>https://maven.vaadin.com/vaadin-addons</url>
</repository>
</repositories>
<pluginRepositories>
<!-- Main Maven repository -->
<pluginRepository>
<id>central</id>
<url>https://repo.maven.apache.org/maven2</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-bom</artifactId>
<version>${vaadin.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<!-- Replace artifactId with vaadin-core to use only free components -->
<artifactId>vaadin</artifactId>
<exclusions>
<!-- Webjars are only needed when running in Vaadin 13 compatibility mode -->
<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>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-spring-boot-starter</artifactId>
<exclusions>
<!-- Excluding so that webjars are not included. -->
<exclusion>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-testbench</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-oauth2-client</artifactId>
</dependency>
<dependency>
<groupId>org.vaadin.crudui</groupId>
<artifactId>crudui</artifactId>
<version>4.1.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>commons-validator</groupId>
<artifactId>commons-validator</artifactId>
<version>1.6</version>
</dependency>
<dependency>
<groupId>org.claspina</groupId>
<artifactId>confirm-dialog</artifactId>
<version>2.0.0</version>
</dependency>
</dependencies>
<build>
<defaultGoal>spring-boot:run</defaultGoal>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<!-- Clean build and startup time for Vaadin apps sometimes may exceed
the default Spring Boot's 30sec timeout. -->
<configuration>
<wait>500</wait>
<maxAttempts>240</maxAttempts>
</configuration>
</plugin>
<!--
Take care of synchronizing java dependencies and imports in
package.json and main.js files.
It also creates webpack.config.js if not exists yet.
-->
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>${vaadin.version}</version>
<executions>
<execution>
<goals>
<goal>prepare-frontend</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<!-- Production mode is activated using -Pproduction -->
<id>production</id>
<properties>
<vaadin.productionMode>true</vaadin.productionMode>
</properties>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>flow-server-production-mode</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<jvmArguments>-Dvaadin.productionMode</jvmArguments>
</configuration>
</plugin>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>${vaadin.version}</version>
<executions>
<execution>
<goals>
<goal>build-frontend</goal>
</goals>
<phase>compile</phase>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
<profile>
<id>integration-tests</id>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<id>start-spring-boot</id>
<phase>pre-integration-test</phase>
<goals>
<goal>start</goal>
</goals>
</execution>
<execution>
<id>stop-spring-boot</id>
<phase>post-integration-test</phase>
<goals>
<goal>stop</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- Runs the integration tests (*IT) after the server is started -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>integration-test</goal>
<goal>verify</goal>
</goals>
</execution>
</executions>
<configuration>
<trimStackTrace>false</trimStackTrace>
<enableAssertions>true</enableAssertions>
<systemPropertyVariables>
<!-- Pass location of downloaded webdrivers to the tests -->
<webdriver.chrome.driver>${webdriver.chrome.driver}</webdriver.chrome.driver>
</systemPropertyVariables>
</configuration>
</plugin>
<plugin>
<groupId>com.lazerycode.selenium</groupId>
<artifactId>driver-binary-downloader-maven-plugin</artifactId>
<version>1.0.17</version>
<configuration>
<onlyGetDriversForHostOperatingSystem>true
</onlyGetDriversForHostOperatingSystem>
<rootStandaloneServerDirectory>
${project.basedir}/drivers/driver
</rootStandaloneServerDirectory>
<downloadedZipFileDirectory>
${project.basedir}/drivers/driver_zips
</downloadedZipFileDirectory>
<customRepositoryMap>
${project.basedir}/drivers.xml
</customRepositoryMap>
</configuration>
<executions>
<execution>
<!-- use phase "none" to skip download step -->
<phase>${drivers.downloader.phase}</phase>
<goals>
<goal>selenium</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
</project>