java - Maven - JAVA_HOME 位置和编译失败执行 javac

Question

---可跳过部分---

大家好，第一次来这里，但愿我不是在写任何其他东西的克隆。我花了几天时间寻找像我这样的案例，但我尝试过的所有方法都失败了，或者无法简单地为我找到正确的解决方案。

我正在尝试在另一个学生的项目中使用 Maven(我必须继续他已经做过的)学校项目，在装有 Ubuntu 14.04 的电脑上。我在从 github 下载的项目目录中，我需要创建一个 .war 文件并将其用于 Tomcat。我正在跟随那个学生的指导，可能我对做什么有点困惑。

---tl:dr 我需要帮助---

所以当我启动 mvn -version 时，我得到了这个:

Java version: 1.7.0_101, vendor: Oracle Corporation Java home: /usr/lib/jvm/java-7-openjdk-amd64/jre Default locale: it_IT, platform encoding: UTF-8 OS name: "linux", version: "3.19.0-58-generic", arch: "amd64", family: "unix"

几天前，我遇到了 $JAVA_HOME 环境变量的问题，可能通过管理/etc/environment 文件解决了它，事实上我没有收到任何关于此的错误。现在，当我执行 mvn package 时，我得到了

[INFO] Scanning for projects... [INFO]
[INFO] ------------------------------------------------------------------------ [INFO] Building GWT Maven Archetype 2.6.0-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-enforcer-plugin:1.3.1:enforce (enforce-versions) @ webprotege --- [INFO] [INFO] --- gwt-maven-plugin:2.7.0:generateAsync (default) @ webprotege --- [INFO] [INFO] --- build-helper-maven-plugin:1.8:add-source (add-source) @ webprotege --- [INFO] Source directory: /home/wapaolo/Documenti/data/webprotege/webprotege/target/generated-sources/gwt added. [INFO] [INFO] --- maven-resources-plugin:2.3:resources (default-resources) @ webprotege --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] Copying 10 resources [INFO] [INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ webprotege --- [INFO] Compiling 1744 source files to /home/wapaolo/Documenti/data/webprotege/webprotege/target/webprotege-2.6.0-SNAPSHOT/WEB-INF/classes [INFO] ------------------------------------------------------------- [ERROR] COMPILATION ERROR : [INFO] ------------------------------------------------------------- [ERROR] Failure executing javac, but could not parse the error: javac: invalid target release: 1.8 Usage: javac use -help for a list of possible options

[INFO] 1 error [INFO] ------------------------------------------------------------- [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 5.241s [INFO] Finished at: Mon May 09 16:54:04 CEST 2016 [INFO] Final Memory: 18M/295M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project webprotege: Compilation failure [ERROR] Failure executing javac, but could not parse the error: [ERROR] javac: invalid target release: 1.8 [ERROR] Usage: javac [ERROR] use -help for a list of possible options [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

那么我现在应该怎么做才能继续？我不知道..

Answer 1

您的 maven 项目需要 java 1.8，但您的编译器是 1.7。在 pom.xml 文件中查找类似

的内容

<configuration>
    <source>1.8</source>
    <target>1.8</target>
</configuration>

并将其更改为 1.7 或下载 1.8 jdk。