JENKINS:当我尝试将旧版 JDK 用于特定 Maven 项目时出错

Question

我在 CentOS Linux 7.3.1611 服务器上使用 Jenkins 版本 2.73-1.1。

服务器上有 3 个不同版本的 JDK:

[root @ jenkins java] # ll
total 12
lrwxrwxrwx. 1 root root 16 27 Apr 16.25 default -> / usr / java / latest
drwxr-xr-x. 8 root root 4096 27 Mar 2013 jdk1.6.0_45
drwxr-xr-x. Root root 4096 11 Apr 2015 jdk1.7.0_80
drwxr-xr-x. 9 root root 4096 27 Apr 16.25 jdk1.8.0_131
lrwxrwxrwx. 1 root root 22 27 apr 16.25 latest -> /usr/java/jdk1.8.0_131

如下图所示，Jenkins 使用的是 jdk1.8.0_131 版本，在我的项目中我指定使用 JDK7。

Jenkins setup Image 1

Jenkins setup Image 2

当我尝试编译我的项目 ( mvn clean deploy ) 时，构建失败，我在日志中看到此错误:

[Vodafone] $ /usr/java/jdk1.7.0_80/bin/java -cp /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-agent-1.11.jar:/opt/apache-maven-3.0.4/boot/plexus-classworlds-2.4.jar org.jvnet.hudson.maven3.agent.Maven3Main /opt/apache-maven-3.0.4 /var/cache/jenkins/war/WEB-INF/lib/remoting-3.10.jar /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-interceptor-1.11.jar /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-interceptor-commons-1.11.jar 46349 <===[JENKINS REMOTING CAPACITY]===>channel started ERROR: ================================================================================ ERROR: Invalid project setup: jenkins/security/MasterToSlaveCallable : Unsupported major.minor version 52.0 ERROR: [JENKINS-18403][JENKINS-28294] JDK 'JAVA7' not supported to run Maven projects. ERROR: Maven projects have to be launched with a Java version greater or equal to the minimum version required by the master. ERROR: Use the Maven JDK Toolchains (plugin) to build your maven project with an older JDK. ERROR: Retrying with slave Java and setting compile/test properties to point to /usr/java/jdk1.7.0_80. ERROR: ================================================================================ Established TCP socket on 38129 [Vodafone] $ /usr/java/jdk1.8.0_131/jre/bin/java -cp /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-agent-1.11.jar:/opt/apache-maven-3.0.4/boot/plexus-classworlds-2.4.jar org.jvnet.hudson.maven3.agent.Maven3Main /opt/apache-maven-3.0.4 /var/cache/jenkins/war/WEB-INF/lib/remoting-3.10.jar /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-interceptor-1.11.jar /var/lib/jenkins/plugins/maven-plugin/WEB-INF/lib/maven3-interceptor-commons-1.11.jar 38129 <===[JENKINS REMOTING CAPACITY]===>channel started

为什么 Jenkins 不使用 jdk 7？

Answer 1

正如 maven project plugin 上记录的那样 Jenkins 主页:

Jenkins >= 2.54 requires Java 8 thus Maven jobs must be launched with Java >= 8

幸运的是，您的堆栈跟踪中刚刚提到了最好的解决方法:

... Use the Maven JDK Toolchains (plugin) to build your maven project with an older JDK...

为了使用 java 7 编译您的项目并使用当前的 jenkins 版本启动成功的 jenkins 作业，我建议您使用 this plugin通过 2 个简单的步骤:

添加 工具链.xml 文件到您的 .m2 开发人员系统和 jenkins 服务器上的目录

<toolchains>
  <toolchain>
    <type>jdk</type>
    <provides>
      <version>1.7</version>
      <vendor>openjdk</vendor>
    </provides>
    <configuration>
      <jdkHome>/usr/lib/jvm/java-7-openjdk-amd64</jdkHome>
    </configuration>
  </toolchain>
  <toolchain>
    <type>jdk</type>
    <provides>
      <version>1.8</version>
      <vendor>openjdk</vendor>
    </provides>
    <configuration>
      <jdkHome>/usr/lib/jvm/java-8-openjdk-amd64</jdkHome>
    </configuration>
  </toolchain> 
  [...]
</toolchains>

添加工具链 插件 到您的项目 pom 文件

<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-toolchains-plugin</artifactId>
        <version>1.1</version>
        <executions>
          <execution>
            <goals>
              <goal>toolchain</goal>
            </goals>
            </execution>
          </executions>
          <configuration>
            <toolchains>
              <jdk>
                <version>1.7</version>  
                <vendor>openjdk</vendor>
              </jdk>
            </toolchains>
          </configuration>
      </plugin>
    </plugins>
  </build>
</project>

最后配置您的 jenkins 作业以使用 jdk 8 ，工具链将负责编译您的项目 jdk 7 .