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如何在Maven項目中更改源

[英]How to change source in maven project

 原文  2014-07-15 02:15:09  0   2    java/ eclipse/ maven

問題描述

我的Maven項目面臨着奇怪的錯誤。 當我編譯項目時，出現以下異常 

[ERROR] (use -source 5 or higher to enable for-each loops)
[ERROR] /home/ashish/code/arena/JUnit/src/main/java/com/tutorial/junit/controller/DefaultController.java:[14,15] error: generics are not supported in -source 1.3
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project junit: Compilation failure
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.CompilationFailureException: Compilation failure
    at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:516)
    at org.apache.maven.plugin.CompilerMojo.execute(CompilerMojo.java:114)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)

我真的不知道為什么會遇到此錯誤，因為我正在使用jdk 1.8和maven 3.0.5，並且項目在Eclipse luna中可以完美編譯。 

ashish@ashish-ThinkPad-Edge-E430:~/code/arena/JUnit$ mvn -version
Apache Maven 3.0.5
Maven home: /usr/share/maven
Java version: 1.8.0_05, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-8-oracle/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.13.0-30-generic", arch: "amd64", family: "unix"

這是我的pom文件的內容。 

 <?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>
  <groupId>com.tutorial</groupId>
  <artifactId>junit</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>Junit tutorial</name>
  <description>This project contain the files used in the JUnit tutorial</description>
  <properties>
    <powermock.version>1.5.5</powermock.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.easymock</groupId>
      <artifactId>easymock</artifactId>
      <version>3.2</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.mockito</groupId>
      <artifactId>mockito-all</artifactId>
      <version>1.9.5</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-module-junit4</artifactId>
      <version>1.5.5</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-api-mockito</artifactId>
      <version>1.5.5</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-server</artifactId>
      <version>9.2.1.v20140609</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.eclipse.jetty</groupId>
      <artifactId>jetty-servlet</artifactId>
      <version>9.2.1.v20140609</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.apache.cactus</groupId>
      <artifactId>cactus</artifactId>
      <version>1.8.1</version>
      <type>pom</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.apache.cactus</groupId>
      <artifactId>cactus.core.framework.javaEE.12-13-14</artifactId>
      <version>1.8.1</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.9</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>
  <repositories>
    <repository>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>central</id>
      <name>Central Repository</name>
      <url>http://repo.maven.apache.org/maven2</url>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <releases>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
      <id>central</id>
      <name>Central Repository</name>
      <url>http://repo.maven.apache.org/maven2</url>
    </pluginRepository>
  </pluginRepositories>
  <build>
    <sourceDirectory>/home/ashish/code/arena/JUnit/src/main/java</sourceDirectory>
    <scriptSourceDirectory>/home/ashish/code/arena/JUnit/src/main/scripts</scriptSourceDirectory>
    <testSourceDirectory>/home/ashish/code/arena/JUnit/src/test/java</testSourceDirectory>
    <outputDirectory>/home/ashish/code/arena/JUnit/target/classes</outputDirectory>
    <testOutputDirectory>/home/ashish/code/arena/JUnit/target/test-classes</testOutputDirectory>
    <resources>
      <resource>
        <directory>/home/ashish/code/arena/JUnit/src/main/resources</directory>
      </resource>
    </resources>
    <testResources>
      <testResource>
        <directory>/home/ashish/code/arena/JUnit/src/test/resources</directory>
      </testResource>
    </testResources>
    <directory>/home/ashish/code/arena/JUnit/target</directory>
    <finalName>junit-0.0.1-SNAPSHOT</finalName>
    <pluginManagement>
      <plugins>
        <plugin>
          <artifactId>maven-antrun-plugin</artifactId>
          <version>1.3</version>
        </plugin>
        <plugin>
          <artifactId>maven-assembly-plugin</artifactId>
          <version>2.2-beta-5</version>
        </plugin>
        <plugin>
          <artifactId>maven-dependency-plugin</artifactId>
          <version>2.8</version>
        </plugin>
        <plugin>
          <artifactId>maven-release-plugin</artifactId>
          <version>2.3.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
    <plugins>
      <plugin>
        <artifactId>maven-clean-plugin</artifactId>
        <version>2.5</version>
        <executions>
          <execution>
            <id>default-clean</id>
            <phase>clean</phase>
            <goals>
              <goal>clean</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-resources-plugin</artifactId>
        <version>2.6</version>
        <executions>
          <execution>
            <id>default-testResources</id>
            <phase>process-test-resources</phase>
            <goals>
              <goal>testResources</goal>
            </goals>
          </execution>
          <execution>
            <id>default-resources</id>
            <phase>process-resources</phase>
            <goals>
              <goal>resources</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <version>2.4</version>
        <executions>
          <execution>
            <id>default-jar</id>
            <phase>package</phase>
            <goals>
              <goal>jar</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.5.1</version>
        <executions>
          <execution>
            <id>default-compile</id>
            <phase>compile</phase>
            <goals>
              <goal>compile</goal>
            </goals>
          </execution>
          <execution>
            <id>default-testCompile</id>
            <phase>test-compile</phase>
            <goals>
              <goal>testCompile</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.12.4</version>
        <executions>
          <execution>
            <id>default-test</id>
            <phase>test</phase>
            <goals>
              <goal>test</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-install-plugin</artifactId>
        <version>2.4</version>
        <executions>
          <execution>
            <id>default-install</id>
            <phase>install</phase>
            <goals>
              <goal>install</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-deploy-plugin</artifactId>
        <version>2.7</version>
        <executions>
          <execution>
            <id>default-deploy</id>
            <phase>deploy</phase>
            <goals>
              <goal>deploy</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-site-plugin</artifactId>
        <version>3.3</version>
        <executions>
          <execution>
            <id>default-site</id>
            <phase>site</phase>
            <goals>
              <goal>site</goal>
            </goals>
            <configuration>
              <outputDirectory>/home/ashish/code/arena/JUnit/target/site</outputDirectory>
              <reportPlugins>
                <reportPlugin>
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-project-info-reports-plugin</artifactId>
                </reportPlugin>
              </reportPlugins>
            </configuration>
          </execution>
          <execution>
            <id>default-deploy</id>
            <phase>site-deploy</phase>
            <goals>
              <goal>deploy</goal>
            </goals>
            <configuration>
              <outputDirectory>/home/ashish/code/arena/JUnit/target/site</outputDirectory>
              <reportPlugins>
                <reportPlugin>
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-project-info-reports-plugin</artifactId>
                </reportPlugin>
              </reportPlugins>
            </configuration>
          </execution>
        </executions>
        <configuration>
          <outputDirectory>/home/ashish/code/arena/JUnit/target/site</outputDirectory>
          <reportPlugins>
            <reportPlugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-project-info-reports-plugin</artifactId>
            </reportPlugin>
          </reportPlugins>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <reporting>
    <outputDirectory>/home/ashish/code/arena/JUnit/target/site</outputDirectory>
  </reporting>
</project>

來自Maven的前幾行帶有-X標志 

ashish@ashish-ThinkPad-Edge-E430:~/code/arena/JUnit$ mvn clean compile -X
Apache Maven 3.0.5
Maven home: /usr/share/maven
Java version: 1.8.0_05, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-8-oracle/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.13.0-30-generic", arch: "amd64", family: "unix"
[INFO] Error stacktraces are turned on.
[DEBUG] Reading global settings from /usr/share/maven/conf/settings.xml
[DEBUG] Reading user settings from /home/ashish/.m2/settings.xml
[DEBUG] Using local repository at /home/ashish/.m2/repository
[DEBUG] Using manager EnhancedLocalRepositoryManager with priority 10 for /home/ashish/.m2/repository
[INFO] Scanning for projects...
[DEBUG] Extension realms for project com.tutorial:junit:jar:0.0.1-SNAPSHOT: (none)
[DEBUG] Looking up lifecyle mappings for packaging jar from ClassRealm[plexus.core, parent: null]
[DEBUG] === REACTOR BUILD PLAN ================================================
[DEBUG] Project: com.tutorial:junit:jar:0.0.1-SNAPSHOT
[DEBUG] Tasks:   [clean, compile]
[DEBUG] Style:   Regular
[DEBUG] =======================================================================
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Junit tutorial 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------

2 個解決方案

解決方案1
 4 已采納  2014-07-15 03:21:38

您需要在maven-compiler-plugin的<configuration>部分中設置<source>和<target>版本。

這是一個例子： 

<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <source>1.4</source>
          <target>1.4</target>
        </configuration>
      </plugin>
    </plugins>
    [...]
  </build>
  [...]
</project>

Maven網站上對此進行了詳細記錄 。

解決方案2
 2  2014-07-15 02:18:01

告訴我這不是完整的pom.xml文件。

您正在使用非常低的Java版本來編譯項目。 可能是1.4或1.3（甚至更低）。 贈品是您無法使用for-each循環的錯誤，該錯誤已在Java 5（或1.5）中添加。

即使您使用的是1.8 JVM，也請記住Java往往具有很好的向后兼容性，因此您可以將源代碼編譯為低於JVM版本的級別。 我將檢查Maven項目/構建/插件/插件區域中的maven-compiler-plugin，並查看是否針對某些特定發行版進行了配置。

我還將使用-X標志運行maven並查看編譯器插件的配置參數。

在這兩者之間，您也許可以查明問題所在。

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