在jenkins docker中编译时，如何“解决在源代码1.5中不支持lambda表达式的问题[错误]”

Question

我正在尝试学习jenkins教程：

https://www.youtube.com/watch?v=FonVQNqLWiE

但我正试图在dockerized jenkins中做到这一点。为此，我不创建Windows虚拟机，而是运行官方jenkins docker映像：

$ docker pull jenkins/jenkins:lts
$ docker run -P jenkins/jenkins:lts

为了继续到第6章，为了确保maven可用，我用以下命令进入容器：

$ docker exec -it -u root amazing_bose bash

（amazing_bose是docker分配给机器的随机名称）然后，在里面我这样做：

# apt-get update
# apt-get install maven
# which mvn
/usr/bin/mvn
# mvn --version
Apache Maven 3.3.9
Maven home: /usr/share/maven
Java version: 1.8.0_232, vendor: Oracle Corporation
Java home: /usr/local/openjdk-8/jre
Default locale: en, platform encoding: UTF-8
OS name: "linux", version: "4.9.184-linuxkit", arch: "amd64", family: "unix"

在第六章之前，一切都很好。存储库是https://github.com/executeautomation/cucumberbasic，码头工人的jenkins控制台中的编译结果以以下内容结束:

Downloaded: https://repo.maven.apache.org/maven2/com/google/collections/google-collections/1.0/google-collections-1.0.jar (625 KB at 884.7 KB/sec)
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 1 source file to /var/jenkins_home/workspace/TestJenkinsXavi/target/classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 18.532 s
[INFO] Finished at: 2019-11-15T12:40:01+00:00
[INFO] Final Memory: 17M/115M
[INFO] ------------------------------------------------------------------------
Finished: SUCCESS

相反，在第7章中，它建议为另一个项目构建验证maven目标：https://github.com/executeautomation/SeleniumWithCucucumber

在这里，在视频教程中，它成功编译，但当我这样做时，我得到了这个控制台的结尾：

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 18.197 s
[INFO] Finished at: 2019-11-18T08:15:03+00:00
[INFO] Final Memory: 17M/160M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.5.1:compile (default-compile) on project CucumberBasics: Compilation failure: Compilation failure:
[ERROR] /var/jenkins_home/workspace/TestJenkinsXavi/src/main/java/com/ea/Main.java:[73,61] lambda expressions are not supported in -source 1.5
[ERROR] (use -source 8 or higher to enable lambda expressions)
[ERROR] /var/jenkins_home/workspace/TestJenkinsXavi/src/main/java/com/ea/Main.java:[118,50] method references are not supported in -source 1.5
[ERROR] (use -source 8 or higher to enable method references)
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

构建步骤“调用顶级Maven目标”标记为“构建失败”已完成:失败

所以问题是:

由于它是一个封闭的容器(jenkins/jenkins:lts ),并且它是一个不是我的源代码(它来自教程的作者),我想知道我必须做什么才能使它编译< code>verify目标。

Answer 1

您的构建因以下情况而失败

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.5.1:compile (default-compile) on project CucumberBasics: Compilation failure: Compilation failure:
[ERROR] /var/jenkins_home/workspace/TestJenkinsXavi/src/main/java/com/ea/Main.java:[73,61] lambda expressions are not supported in -source 1.5
[ERROR] (use -source 8 or higher to enable lambda expressions)

我假设您的代码中包含 lambda 函数。尝试使用日志中指定的 -source 8 标志执行生成。这应该可以解决问题，或者至少为您提供下一个问题。

Answer 2

解决方案是在Maven调用上指定源和目标JDK级别：

-Dmaven.compiler.source=8 -Dmaven.compiler.target=8

在Jenkins，单击Maven构建的“高级”按钮，并将这些选项添加到标记为“MAVEN_OPTS”的行中。