将基于 Vaadin 11 的 Maven 驱动项目更改为 Vaadin 12 alpha 版本？

Question

问题

我在IntelliJ 2018.3 有一个工作项目，用于Vaadin 11，使用Project Base starter-pack 创建。

➥ 如何从 Vaadin 11.0.0 切换到 Vaadin 12.0.0.alpha4 ？

我的问题与此类似，Vaadin 8 alpha/beta prerelease fail with “Non-resolvable import POM: Failure to find” errors。该页面上的The solution 是在IntelliJ 的Maven 侧边栏中的Profiles 列表中启用vaadin-prerelease 复选框。但是对于 Vaadin 11 项目，在那里找到的唯一此类复选框标记为 production-mode。

失败的解决方案

在项目的Maven POM文件pom.xml，我尝试切换：

<vaadin.version>11.0.0</vaadin.version>

…到：

<vaadin.version>12.0.0.alpha4</vaadin.version>

...从currently published JavaDoc site 中获取了版本号字符串。

在使用此版本号执行 Maven clean 时，我收到以下错误：

[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Non-resolvable import POM: Failure to find com.vaadin:vaadin-bom:pom:12.0.0.alpha4 in http://maven.vaadin.com/vaadin-addons was cached in the local repository, resolution will not be reattempted until the update interval of Vaadin Directory has elapsed or updates are forced @ line 28, column 25
[ERROR] 'dependencies.dependency.version' for com.vaadin:vaadin-core:jar is missing. @ line 39, column 21
[ERROR] 'dependencies.dependency.version' for org.slf4j:slf4j-simple:jar is missing. @ line 46, column 21
 @ 
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]   
[ERROR]   The project com.basilbourque.acme:acme:1.0-SNAPSHOT (/Users/basilbourque/IdeaProjects/Acme/pom.xml) has 3 errors
[ERROR]     Non-resolvable import POM: Failure to find com.vaadin:vaadin-bom:pom:12.0.0.alpha4 in http://maven.vaadin.com/vaadin-addons was cached in the local repository, resolution will not be reattempted until the update interval of Vaadin Directory has elapsed or updates are forced @ line 28, column 25 -> [Help 2]
[ERROR]     'dependencies.dependency.version' for com.vaadin:vaadin-core:jar is missing. @ line 39, column 21
[ERROR]     'dependencies.dependency.version' for org.slf4j:slf4j-simple:jar is missing. @ line 46, column 21
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException

Answer 1

简单的方法

Vaadin Ltd 现在让这变得更容易了。他们在页面上添加了一个选项卡，其中列出了 POM 的启动包，这些 POM 预配置为使用最新的预发布版本。

https://vaadin.com/start/pre-release

手动方式

我确实不知道以下解决方案是否正确，但它似乎有效。不幸的是，Vaadin 网站上没有记录解决方案，所以I put in a request。

配置预发布 Maven 存储库

Project Base 启动包构建的 POM 文件似乎缺少必要的 Maven 配置设置来查找 Vaadin 的 alpha/beta 预发布版本。

截至 2018 年 11 月 15 日，对于 Vaadin 12.0.0.beta2，采用一个工作项目，例如从 Vaadin 入门包页面上的“项目库”创建的项目，并进行以下更改。这今天有效，但我有much trouble over past weeks。我怀疑问题是某些 Maven 或 Vaadin 存储库没有正确更新，并且缺少一些关键文件。无论如何，它在今天仍然有效。

首先，在 GitHub 上的 vaadin/platform 的 Releases 页面上找到最新的 alpha 或 beta 版本号。今天是12.0.0.beta2。

(1)

为 Maven 刷新本地缓存。

在 IntelliJ 2018 中，选择 Preferences/Settings > Build, Execution, Deployment > Build Tools > Maven > Repositories > Update（按钮）。

(2)

在您项目的 POM 文件中，更改以下内容：

<vaadin.version>11.0.2</vaadin.version>

…到这个：

 <vaadin.version>12.0.0.beta2</vaadin.version>

(3)

在repositories元素内，添加：

    <repository>
        <id>vaadin-prereleases</id>
        <url>https://maven.vaadin.com/vaadin-prereleases</url>
    </repository>

(4)

在repositories元素下方，添加：

<pluginRepositories>
    <!-- Repository needed for prerelease versions of Vaadin -->
    <pluginRepository>
        <id>vaadin-prereleases</id>
        <url>https://maven.vaadin.com/vaadin-prereleases</url>
    </pluginRepository>
</pluginRepositories>

(5)

执行 Maven clean 和 install。

验证您的POM 没有报告错误。

---

这是一个完整的工作 POM，我改编自 page of starter-packs 上的 Project Base。

要查找我的 3 个更改，请搜索措辞：alphas-betas

<?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.basilbourque.acme</groupId>
    <artifactId>acme</artifactId>
    <name>Acme</name>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</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>
        <failOnMissingWebXml>false</failOnMissingWebXml>

        <!--<vaadin.version>11.0.2</vaadin.version>-->
        <!--Change above line to line below for alphas-betas-->
        <vaadin.version>12.0.0.beta2</vaadin.version>
    </properties>

    <repositories>
        <!-- Repository used by many Vaadin add-ons -->
        <repository>
            <id>Vaadin Directory</id>
            <url>http://maven.vaadin.com/vaadin-addons</url>
        </repository>

        <!--Add this for alphas-betas-->
        <repository>
            <id>vaadin-prereleases</id>
            <url>https://maven.vaadin.com/vaadin-prereleases</url>
        </repository>

    </repositories>

    <!--Add this for alphas-betas-->
    <pluginRepositories>
        <!-- Repository needed for prerelease versions of Vaadin -->
        <pluginRepository>
            <id>vaadin-prereleases</id>
            <url>https://maven.vaadin.com/vaadin-prereleases</url>
        </pluginRepository>
    </pluginRepositories>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.vaadin</groupId>
                <artifactId>vaadin-bom</artifactId>
                <type>pom</type>
                <scope>import</scope>
                <version>${vaadin.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-core</artifactId>
        </dependency>

        <!-- Added to provide logging output as Flow uses -->
        <!-- the unbound SLF4J no-operation (NOP) logger implementation -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <!-- Jetty plugin for easy testing without a server -->
            <plugin>
                <groupId>org.eclipse.jetty</groupId>
                <artifactId>jetty-maven-plugin</artifactId>
                <version>9.4.11.v20180605</version>
                <configuration>
                    <scanIntervalSeconds>1</scanIntervalSeconds>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <profiles>
        <profile>
            <!-- Production mode can be activated with either property or profile -->
            <id>production-mode</id>
            <activation>
                <property>
                    <name>vaadin.productionMode</name>
                </property>
            </activation>
            <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>com.vaadin</groupId>
                        <artifactId>vaadin-maven-plugin</artifactId>
                        <version>${vaadin.version}</version>
                        <executions>
                            <execution>
                                <goals>
                                    <goal>copy-production-files</goal>
                                    <goal>package-for-production</goal>
                                </goals>
                            </execution>
                        </executions>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>
</project>