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maven-compiler-plugin is missing
2015/08/24

mavenでmaven-compiler-plugin is missingというWARNINGが出ました。

◆環境
OS Windows 7 Professional Service Pack 1 (64bit)
maven 3.3.3
Java 1.8.0_25

WARNINGの表示は次の通りです。

> mvn clean install -Dmaven.test.skip=true
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective m
odel for com.ymlib:ymlib-api:jar:0.0.3
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:m
aven-compiler-plugin is missing. @ com.ymlib:ymlib-api:[unknown-versi
on], C:\workspace\ymlib-api\pom.xml, line 16, column 15
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:m
aven-jar-plugin is missing. @ com.ymlib:ymlib-api:[unknown-version],
C:\workspace\ymlib-api\pom.xml, line 29, column 15
[WARNING]
[WARNING] It is highly recommended to fix these problems because they t
hreaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer suppor
t building such malformed projects.
[WARNING]
[INFO]
[INFO] ----------------------------------------------------------------
[INFO] Building YMLib API 0.0.3
[INFO] ----------------------------------------------------------------
[INFO]
:

build.plugins.plugin.versionが無いという警告が2件出ています。 pom.xmlを確認し、maven-compiler-pluginとmaven-jar-pluginにversionタグを追加しました。

pom.xml
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  <artifactId>ymlib-api</artifactId>
  <name>YMLib API</name>
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>testCompile</goal>
            </goals>
            <configuration>
              <skip>false</skip>
            </configuration>
          </execution>
        </executions>
        <version>3.3</version>
      </plugin>
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>test-jar</goal>
            </goals>
          </execution>
        </executions>
        <version>2.6</version>
      </plugin>
    </plugins>
  </build>

WARNINGが消えました。 いつからかversionタグを指定しなければならなくなったようです。

dependenciesの方にもversionタグを付けたmavenしなおしたら、新たにダウンロードが始まりました。

pom.xml
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  <dependencies>
    <dependency>
      <groupId>commons-collections</groupId>
      <artifactId>commons-collections</artifactId>
      <version>3.2.1</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>
    <dependency>
      <groupId>commons-lang</groupId>
      <artifactId>commons-lang</artifactId>
      <version>2.6</version>
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <scope>test</scope>
      <version>1.2.17</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
    </dependency>
  </dependencies>

versionを適当に指定するとファイルのダウロードに失敗しますので、プラグイン毎のバージョンを調べておく必要があります。

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