部署到 Heroku 时 com.vaadin.ui.UI 出现 ClassNotFoundException

Question

我将我的 Vaadin 应用程序部署到 Heroku，但它崩溃了。

heroku logs -t returns 这个：

java.lang.ClassNotFoundException: com.vaadin.ui.UI

我的 pom 文件如下所示：

<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>SudokuForFun</groupId>
<artifactId>SudokuForFun</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>sudoku-for-fun</name>
<build>
    <sourceDirectory>src</sourceDirectory>
    <resources>
        <resource>
            <directory>src</directory>
            <excludes>
                <exclude>**/*.java</exclude>
            </excludes>
        </resource>
    </resources>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-eclipse-plugin</artifactId>
            <version>2.9</version>
        </plugin>
        <plugin>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.4</version>
            <configuration>
                <warSourceDirectory>WebContent</warSourceDirectory>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>
    </plugins>
</build>
<dependencies>
    <dependency>
        <groupId>eu.hurion.vaadin.heroku</groupId>
        <artifactId>vaadin-for-heroku</artifactId>
        <version>1.0</version>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-server</artifactId>
        <version>7.5.4</version>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-client-compiled</artifactId>
        <version>7.5.4</version>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-client</artifactId>
        <version>7.5.4</version>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-push</artifactId>
        <version>7.5.4</version>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-themes</artifactId>
        <version>7.5.4</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.0.1</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

如果我运行本地服务器 (Tomcat) 中的应用程序，它运行正常。有人有过这个吗？我认为这是一个非常简单的问题，但我忽略了它。

我的项目托管在 Github

Answer 1

我刚刚自己找到了答案。我只需要将以下插件添加到 pom.xml，现在我不再遇到该异常。

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>2.4</version>
            <executions>
                <execution>
                    <id>copy-dependencies</id>
                    <phase>package</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

我不确定为什么，但看起来它与复制依赖项有关...

部署到 Heroku 时 com.vaadin.ui.UI 出现 ClassNotFoundException

ClassNotFoundException on com.vaadin.ui.UI when deploying to Heroku

heroku

vaadin

maven