java无法在Linux Ubuntu 12.04上运行maven2

Question

我正在尝试在Linux 12.04中使用maven编译一个程序。为此，我使用mvn clean install命令。但是，我得到一个生成错误：

[ERROR] Unable to locate the Javac Compiler in:
  /usr/lib/jvm/java-6-openjdk-amd64/jre/../lib/tools.jar
Please ensure you are using JDK 1.4 or above and
not a JRE (the com.sun.tools.javac.Main class is required).
In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable.

我检查了路径，实际上我丢失了那个关键文件。这就是我所拥有的：

user@modelX:/usr/lib/jvm/java-6-openjdk-amd64/jre/lib$ ls
accessibility.properties  im                    net.properties
amd64                     images                psfontj2d.properties
calendars.properties      jar.binfmt            psfont.properties.ja
charsets.jar              javazic.jar           resources.jar
classlist                 jce.jar               rhino.jar
cmm                       jexec                 rt.jar
compilefontconfig.jar     jsse.jar              security
content-types.properties  jvm.hprof.txt         sound.properties
currency.data             logging.properties    swing.properties
ext                       management            tz.properties
flavormap.properties      management-agent.jar  zi
fontconfig.properties     meta-index

显然，我运行的是openJDK，但我缺少文件。我该如何解决这个问题

Answer 1

确保您选择了正确的jdk：

$ sudo update-alternatives --config java

我必须选择/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java来运行mvn。不祥的是，有一种工具。jar在/usr/lib/jvm/java-7-openjdk-amd64/，但在/usr/lib/jvm/java-6-openjdk-amd64/

Answer 2

很明显我错过了一些重要的包裹。我在这个网站上找到了解决方案：

• http://sixarm.com/about/error-unable-to-locate-tools-jar.html

Answer 3

In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable.

请确保JAVA_HOME指向/usr/lib/jvm/java-6-openjdk-amd64/

Answer 4

运行javac：

  javac

如果找不到，请检查路径：

  echo $PATH

它应该包含

  /usr/lib/jvm/java-6-openjdk-amd64/bin