带有VAADIN8、Gradle和SpringBoot的Canvas插件

Question

我对所有的Gradle、VAADIN和Spring都是新手，我只是在学习一个简单的VAADIN Spring Boot tutorial (https://spring.io/guides/gs/crud-with-vaadin/)，并尝试从https://github.com/hezamu/vaadincanvas添加Canvas附加组件，但是当我添加编译依赖时

compile("org.vaadin.hezamu:canvas:2.3.0")

VAADIN小部件编译将失败，并出现大量奇怪的错误：

Using Gradle Vaadin Plugin 1.3.1
:vaadinPluginVersionCheck SKIPPED
:compileJava UP-TO-DATE
:vaadinUpdateWidgetset
:processResources UP-TO-DATE
:classes UP-TO-DATE
:vaadinClassPathJar UP-TO-DATE
Errors in 'jar:file:/C:/Users/msc/.gradle/caches/modules-2/files-2.1/com.vaadin/vaadin-client/8.1.8/93548adad170aea9fe62ab742908fe63fe0ec321/vaadin-client-8.1.8.jar!/com/vaadin/client/extensions/DragSourceExtensionConnector.java'
Line 413: The method getState() from the type DragSourceExtensionConnector refers to the missing type DragSourceState
Line 38: The import com.vaadin.shared.ui.dnd cannot be resolved
Line 433: DragSourceRpc cannot be resolved to a type
Line 605: DragSourceState cannot be resolved to a type
Line 39: The import com.vaadin.shared.ui.dnd cannot be resolved
Line 507: DragSourceRpc cannot be resolved to a type
Line 190: The method getState() from the type DragSourceExtensionConnector refers to the missing type DragSourceState
Line 433: The method getRpcProxy(Class<T>) in the type AbstractConnector is not applicable for the arguments (Class<DragSourceRpc>)
Line 212: DragSourceState cannot be resolved to a variable
Line 492: DropEffect cannot be resolved
Line 606: DragSourceState cannot be resolved to a type

只需移除其中一个依赖项，项目即可构建。这是整个Gradle构建文件：

buildscript {
    repositories {
        jcenter()
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.5.10.RELEASE")
        classpath "com.devsoap.plugin:gradle-vaadin-plugin:1.3.1"
        classpath "javax.validation:validation-api:1.1.0.Final"
    }
}

plugins {
    id "com.devsoap.plugin.vaadin" version "1.3.1"
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
apply plugin: 'com.devsoap.plugin.vaadin'

jar {
    baseName = 'gs-crud-with-vaadin'
    version =  '0.1.0'
}

repositories {
    mavenCentral()
    maven { url "https://oss.sonatype.org/content/repositories/vaadin-snapshots" }
    maven { url "https://repository.jboss.org/nexus/content/repositories/releases" }
    maven { url "http://oss.sonatype.org/content/repositories/vaadin-snapshots/" }
    maven { url "http://vaadin.com/nexus/content/repositories/vaadin-addons/" }
    maven { url "https://plugins.gradle.org/m2/" }
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

dependencyManagement {
  imports {
    mavenBom 'com.vaadin:vaadin-bom:8.0.0'
  }
}

dependencies {
    compile("org.springframework.boot:spring-boot-starter-data-jpa")
    compile("com.vaadin:vaadin-spring-boot-starter")
    compile("org.springframework.boot:spring-boot-starter-actuator")
    compile("org.vaadin.hezamu:canvas:2.3.0")
    compile("com.h2database:h2")
    testCompile("junit:junit")
    testCompile("org.springframework.boot:spring-boot-starter-test")
}

我做错了什么？我使用的是Gradle 4.1和Java 8。

Answer 1

您的vaadin版本有问题。你有一个8.0.0的bom，但我猜gradle插件试图使用一个较新的版本(8.1.8)。

在Vaadin 8.1中，拖放操作发生了变化。我猜这个插件不支持Vaadin 8.1，因为它之前发布过。

您有三个选择。

如果可能，

1. 使用一些其他插件。
2. 修复自己的插件
3. ，或者作为最后的手段，将以下代码添加到您的构建gradle中以停留在Vaadin8.0中

vaadin {版本'8.0.7‘}

Answer 2

嗯，在对所有版本进行“微调”之后，我让它正常工作了。VAADIN，它的插件和Gradle似乎是一个反复无常的团队。它适用于spring-boot gradle插件1.4.7.RELEASE (重要！)、VAADIN 8.1.1、devsoap VAADIN Gradle插件1.3.1、multifileupload插件3.0.1和canvas插件2.2.0。

这些版本中几乎任何一个版本的任何更改，都会导致一些东西崩溃。