多模塊Maven項目！ 無法將模塊作為依賴項包含在同一項目的另一個模塊中

Question

我正在嘗試建立一個多模塊的Maven項目。 我的項目結構是

Multi-Module-Project
pom.xml
\Module-1
    src\main\java
        com.xyz.module1
           MyTestClass.java
    pom.xml

\Module-2
   src\main\java
        com.xyz.module2
          App.java
   pom.xml

現在，當我嘗試在Module-2的App.java中使用MyTestClass時，在運行命令“ mvn clean install”時出現此錯誤：

    ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Module-2: Compilation failure: Compilation failure:
    [INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] Multi-Module-Project ............................... SUCCESS [  1.361 s]
[INFO] Module-1 ........................................... SUCCESS [  2.511 s]
[INFO] Module-2 ........................................... FAILURE [  0.135 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.721 s
[INFO] Finished at: 2018-01-31T12:11:29+05:30
[INFO] Final Memory: 36M/395M
[INFO] ------------------------------------------------------------------------

[ERROR] /home/xyz/workspace2/Multi-Module-Project/Module-2/src/main/java/com/xyz/module2/App.java:[3,26] package com.xyz.module1 does not exist
[ERROR] /home/xyz/workspace2/Multi-Module-Project/Module-2/src/main/java/com/xyz/module2/App.java:[13,17] cannot find symbol
[ERROR] symbol:   class MyTestClass
[ERROR] location: class com.xyz.module2.App

這是我的主要pom.xml：

<?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.xyz</groupId>
<artifactId>Multi-Module-Project</artifactId>
<version>0.0.1</version>
<packaging>pom</packaging>

<name>Multi-Module-Project</name>
<description>Multi Module Project</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.10.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

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

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>


<modules>
    <module>Module-1</module>
    <module>Module-2</module>
</modules>
</project>`

模塊1 Pom.xml

    <?xml version="1.0"?>
    <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.xyz</groupId>
    <artifactId>Multi-Module-Project</artifactId>
    <version>0.0.1</version>
  </parent>
  <packaging>war</packaging>
  <groupId>com.xyz</groupId>
  <artifactId>Module-1</artifactId>
  <version>0.0.1</version>
  <name>Module-1</name>
  <url>http://maven.apache.org</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

模塊2 Pom.xml

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.xyz</groupId>
    <artifactId>Multi-Module-Project</artifactId>
    <version>0.0.1</version>
  </parent>
  <packaging>war</packaging>
  <groupId>com.xyz</groupId>
  <artifactId>Module-2</artifactId>
  <version>0.0.1</version>
  <name>Module-2</name>
  <url>http://maven.apache.org</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>com.xyz</groupId>
      <artifactId>Module-1</artifactId>
      <version>0.0.1</version>
    </dependency>
  </dependencies>
</project>

這是模塊1中的MyTestClass.java：

package com.xyz.module1;

public class MyTestClass {

    private String name;

    public MyTestClass() {
        super();
    }

    public MyTestClass(String name) {
        super();
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }



}

這是我在模塊2中的App.java：

package com.xyz.module2;

import com.xyz.module1.MyTestClass;


public class App {
    public static void main(String[] args) {
        MyTestClass mtc = new MyTestClass();
        mtc.setName("Bob");
        System.out.println(mtc.getName());
    }
}

Answer 1

對於其他可能會卡在這里的人，這些是解決我的問題的鏈接，

在解決問題之前，我確實必須將Module-1包裝打包。

對我有用的實際答案： https : //github.com/spring-projects/spring-boot/issues/6792

鏈接將我引向實際答案： spring-boot-maven-plugin破壞了兄弟模塊的依賴性

Maven編譯錯誤：包不存在

Answer 2

如果您的模塊1假定用作共享庫，則它沒有WAR包裝。 只需從模塊1配置中移除WAR包裝即可。

WAR工件不能使用其他WAR工件。