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Maven 构建失败：package 不存在

[英]Maven build fails: package does not exist

 原文  2020-12-22 12:51:29  5   1    java/ maven

问题描述

I'm having a strange problem where I have one maven project that has a dependency on another maven project (both are mine) and I'm getting a compilation error complaining that packages don't exist - even though they do.我有一个奇怪的问题，我有一个 maven 项目依赖于另一个 maven 项目（都是我的）并且我收到一个编译错误，抱怨包不存在 - 即使它们确实存在。

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  10.424 s
[INFO] Finished at: 2020-12-22T07:32:51-05:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project e1-task-info2: Compilation failure: Compilation failure:
[ERROR] /C:/Users/jgagnon/workspace/java/e1-task-info2/src/main/java/com/mycompany/e1tasks/backend/util/ExcelFileIngester.java:[10,42] package com.mycompany.exceljson.converter does not exist
[ERROR] /C:/Users/jgagnon/workspace/java/e1-task-info2/src/main/java/com/mycompany/e1tasks/backend/util/ExcelFileIngester.java:[11,37] package com.mycompany.exceljson.pojo does not exist
[ERROR] /C:/Users/jgagnon/workspace/java/e1-task-info2/src/main/java/com/mycompany/e1tasks/backend/util/ExcelFileIngester.java:[12,37] package com.mycompany.exceljson.pojo does not exist

I've done research (including in this forum) and found numerous items on this issue.我已经进行了研究（包括在这个论坛中）并发现了很多关于这个问题的项目。 I've taken some of the advice found, but it still doesn't work.我已经接受了一些找到的建议，但它仍然不起作用。 I don't understand what I'm doing wrong.我不明白我做错了什么。

Here's the scenario:这是场景：

Project A provides functionality that Project B needs to use.项目 A 提供了项目 B 需要使用的功能。

Project A pom.xml:项目A pom.xml：

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.mycompany</groupId>
  <artifactId>excel-to-json</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <name>Excel to JSON Converter</name>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.3.RELEASE</version>
  </parent>

  <properties>
    <java.version>11</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

    <commons-io.version>2.6</commons-io.version>
    <commons-cli.version>1.4</commons-cli.version>
    <org.apache.poi.version>4.1.2</org.apache.poi.version>
  </properties>

  <pluginRepositories>
    <pluginRepository>
      <id>central</id>
      <url>https://repo1.maven.org/maven2/</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </pluginRepository>
  </pluginRepositories>

  <repositories>
    <repository>
      <id>central</id>
      <url>https://repo1.maven.org/maven2/</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>
  </repositories>

  <dependencies>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
      <exclusions>
        <exclusion>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
    </dependency>

    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi</artifactId>
      <version>${org.apache.poi.version}</version>
    </dependency>

    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi-ooxml</artifactId>
      <version>${org.apache.poi.version}</version>
    </dependency>

    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>${commons-io.version}</version>
    </dependency>

    <dependency>
      <groupId>commons-cli</groupId>
      <artifactId>commons-cli</artifactId>
      <version>${commons-cli.version}</version>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>repackage</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

</project>

Project B pom.xml:项目 B pom.xml：

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.mycompany</groupId>
  <artifactId>e1-task-info2</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.3.RELEASE</version>
  </parent>

  <packaging>jar</packaging>

  <properties>
    <java.version>11</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  </properties>

  <pluginRepositories>
    <pluginRepository>
      <id>central</id>
      <url>https://repo1.maven.org/maven2/</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </pluginRepository>
  </pluginRepositories>

  <repositories>
    <repository>
      <id>central</id>
      <url>https://repo1.maven.org/maven2/</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>
  </repositories>

  <dependencies>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
      <exclusions>
        <exclusion>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <optional>true</optional>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <dependency>
      <groupId>com.h2database</groupId>
      <artifactId>h2</artifactId>
      <scope>runtime</scope>
    </dependency>

    <dependency>
      <groupId>javax.validation</groupId>
      <artifactId>validation-api</artifactId>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
    </dependency>

    <!-- The dependency -->
    <dependency>
      <groupId>com.mycompany</groupId>
      <artifactId>excel-to-json</artifactId>
      <version>0.0.1-SNAPSHOT</version>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>repackage</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

</project>

When I build my maven projects I almost always use mvn clean install .当我构建我的 maven 项目时，我几乎总是使用mvn clean install 。 I've gone as far as completely removing my ~/.m2/repository and rebuilding, but it still fails.我已经完全删除了我的~/.m2/repository并重建，但它仍然失败。

1 个解决方案

解决方案1
 1 已采纳  2020-12-22 13:20:14

As the documentation explains, a spring boot project isn't suitable as a dependency for the projects, as the class files are placed somewhere where they can't be seen by the other project, in BOOT-INF/classes: https://docs.spring.io/spring-boot/docs/1.5.x/maven-plugin/examples/repackage-classifier.html正如文档所解释的，spring 启动项目不适合作为项目的依赖项，因为 class 文件放置在其他项目无法看到的位置，在 BOOT-INF/classes： Z5E0515C500A1C4BADEB66 docs.spring.io/spring-boot/docs/1.5.x/maven-plugin/examples/repackage-classifier.html

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