我正在尝试将CRUD加载项与Vaadin 14一起使用。但是当我尝试运行这个视图时：
@Route("configuration")
@JsModule("./styles/shared-styles.js")
@CssImport("./styles/views/main/main-view.css")
public class ConfigurationView extends AppLayout {
/**
*
*/
private static final long serialVersionUID = 1L;
public ConfigurationView(YoloObjectService yoloObjectService, ObjectNameService objectNameService) {
System.out.println(yoloObjectService == null);
System.out.println(objectNameService == null);
// crud instance
GridCrud<YoloObjectEntity> crud = new GridCrud<>(YoloObjectEntity.class);
// grid configuration
crud.getGrid().setColumns("email", "active", "objectName", "threshold");
crud.getGrid().setColumnReorderingAllowed(true);
// form configuration
crud.getCrudFormFactory().setUseBeanValidation(true);
crud.getCrudFormFactory().setVisibleProperties("email", "active", "threshold", "objectName");
crud.getCrudFormFactory().setFieldProvider("objectName", new ComboBoxProvider<>("Object Name", objectNameService.findAll(), new TextRenderer<>(ObjectNameEntity::getName), ObjectNameEntity::getName));
// layout configuration
setContent(crud);
crud.setFindAllOperationVisible(false);
// logic configuration
crud.setOperations(() -> yoloObjectService.findAll(),
user -> yoloObjectService.save(user),
user -> yoloObjectService.save(user),
user -> yoloObjectService.delete(user)
);
}
}
我得到这个错误是因为上面的crud.getCrudFormFactory().setUseBeanValidation(true);。
Caused by: javax.validation.NoProviderFoundException: Unable to create a Configuration, because no Bean Validation provider could be found. Add a provider like Hibernate Validator (RI) to your classpath.
at javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:291) ~[validation-api-2.0.1.Final.jar:na]
at javax.validation.Validation.buildDefaultValidatorFactory(Validation.java:103) ~[validation-api-2.0.1.Final.jar:na]
... 83 common frames omitted
2020-09-22 13:59:37.019 ERROR 10778 --- [nio-8080-exec-3] c.v.flow.server.DefaultErrorHandler :
java.lang.IllegalStateException: BeanValidationBinder cannot be used because a JSR-303 Bean Validation implementation not found on the classpath or could not be initialized. Use Binder instead
at com.vaadin.flow.data.binder.BeanValidationBinder.<init>(BeanValidationBinder.java:85) ~[flow-data-2.3.4.jar:2.3.4]
at com.vaadin.flow.data.binder.BeanValidationBinder.<init>(BeanValidationBinder.java:61) ~[flow-data-2.3.4.jar:2.3.4]
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>com.example.application</groupId>
<artifactId>my-project</artifactId>
<name>My Project</name>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<vaadin.version>14.3.4</vaadin.version>
<dl4j-master.version>1.0.0-beta7</dl4j-master.version>
<sarxos.version>0.3.12</sarxos.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.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>
</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.vaadin.artur</groupId>
<artifactId>a-vaadin-helper</artifactId>
<version>1.2.1</version>
</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>io.github.bonigarcia</groupId>
<artifactId>webdrivermanager</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- Projekt Lombok för att slippa Getters and Setters -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<!-- For Detection with DL4J -->
<dependency>
<groupId>org.deeplearning4j</groupId>
<artifactId>deeplearning4j-datasets</artifactId>
<version>${dl4j-master.version}</version>
</dependency>
<dependency>
<groupId>org.deeplearning4j</groupId>
<artifactId>deeplearning4j-zoo</artifactId>
<version>${dl4j-master.version}</version>
</dependency>
<!-- Camera -->
<dependency>
<groupId>com.github.sarxos</groupId>
<artifactId>webcam-capture</artifactId>
<version>${sarxos.version}</version>
</dependency>
<!-- CRUD -->
<dependency>
<groupId>org.vaadin.crudui</groupId>
<artifactId>crudui</artifactId>
<version>4.3.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
</dependencies>
<build>
<defaultGoal>spring-boot:run</defaultGoal>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<!-- Clean build and startup time for Vaadin apps sometimes may exceed
the default Spring Boot's 30sec timeout. -->
<configuration>
<wait>500</wait>
<maxAttempts>240</maxAttempts>
</configuration>
</plugin>
<!-- Take care of synchronizing java dependencies and imports in package.json
and main.js files. It also creates webpack.config.js if not exists yet. -->
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>${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>it</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>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
</project>
再现问题：
要重现该问题，请运行该项目，然后转到http://localhost:8080，再转到configuration选项卡，然后按+符号。
https://github.com/DanielMartensson/Vaadin-DL4J-YOLO-Camera-Mail-Reporter
问题：
如何找到此Bean验证器？
Jakarta Bean Validation(以前的Java Bean Validation(是一个API，您需要提供它的实现才能使用它。有两个，Hibernate Validator和Apache BVal。您可以将其中任何一个添加到pom.xml文件中。根据您的运行时环境，可以通过不同的方式添加这些内容。由于您似乎正在使用Spring Boot，因此可以添加以下依赖项：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
我建议您阅读本教程，以便快速更好地了解Jakarta Bean Validation。这是一个非常受欢迎的API，将来你很可能会在其他项目中找到它。
正如教程中所解释的，您需要有一个雅加达Bean验证器的实际实现类。在链接的教程中，显示了一个可用依赖项列表，您可以根据环境使用这些依赖项。无论如何，我建议你阅读整个教程。
因此，如果您有一个Java EE环境，请将其添加到您的pom:
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.1.5.Final</version> /* check for the latest version at https://hibernate.org/validator/documentation/getting-started/ */
</dependency>
如果你有Spring Boot，试试这个：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
如果是Java SE，请尝试以下操作：
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.1.5.Final</version> /* check for the latest version at https://hibernate.org/validator/documentation/getting-started/ */
</dependency>
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>jakarta.el</artifactId>
<version>3.0.3</version>
</dependency>