Maven没有正确选择JAVA_HOME [英] Maven not picking JAVA_HOME correctly

问题描述

我在Windows环境中并使用maven编译我的项目。虽然我刚刚创建了项目并添加了各种库的依赖项。

I am on windows environment and using maven to compile my project. Although I just created the project and added the dependencies for various libararies.

当我添加它们时，maven开始抱怨缺少的 tools.jar ，所以我在下面添加到我的 pom.xml ：

As I added them maven started complaining for the missing tools.jar, so i added below to my pom.xml:

<dependency>
  <groupId>com.sun</groupId>
  <artifactId>tools</artifactId>
  <version>1.6</version>
  <scope>system</scope>
  <systemPath>${java.home}/../lib/tools.jar</systemPath>
</dependency>

当我运行maven安装时，我得到了一个错误的jar错误，如下所示：

When i ran the maven install, i got an error for the missing jar as below :

[ERROR] Failed to execute goal on project GApp: Could not resolve dependencies for project GApp:GApp:war:0.0.1-SNAPSHOT: Could not find artifact com.sun:tools:jar:1.6 at specified path C:\Program Files\Java\jre6\lib\tools.jar -> [Help 1]

问题在于 tools.jar 位于 C：\Program Files \Java \ _jdk1.6.0_26 \ ltl 并在 JAVA_HOME 环境变量但是maven仍在查找jre文件夹，如错误消息 C：\Program Files \ Java @ \\ _jre6 \lib \ tools。 jar 。

The issue is that the tools.jar is in "C:\Program Files\Java\jdk1.6.0_26\lib" and is correctly set in the JAVA_HOME environment variable but the maven is still looking in jre folder as in error message "C:\Program Files\Java\jre6\lib\tools.jar".

C:\>echo %JAVA_HOME%
C:\Program Files\Java\jdk1.6.0_26

有趣的 ：当我设置依赖的完整路径时，它工作得很好。但我不想硬编码。

Interestingly: when i set the full path in dependency, it worked just fine. But i don't want to hard code it.

<dependency>
  <groupId>com.sun</groupId>
  <artifactId>tools</artifactId>
  <version>1.6</version>
  <scope>system</scope>
  <systemPath>C:\Program Files\Java\jdk1.6.0_26\lib\tools.jar</systemPath>
</dependency>

有人可以建议任何动态解决方案吗？

Can someone suggest any dynamic solution for this?

推荐答案

这是Eclipse Maven支持中的一个错误。根据 Maven规范 ，Eclipse不支持所有全局Maven属性。

It's a bug in the Eclipse Maven support. Eclipse doesn't support all of the global Maven properties as per the Maven specs.

根据规格：

$ {java.home}指定当前JRE_HOME环境的路径
使用相对路径获取例如

${java.home} specifies the path to the current JRE_HOME environment use with relative paths to get for example

至少在Eclipse 4.3.1中是不是这样，这里 java.home 总是指向用于启动Eclipse 的 JRE，而不是构建JRE。

At least in Eclipse 4.3.1 that is not the case, here java.home always points to the JRE that was used to launch Eclipse, not the build JRE.

要解决此问题，您需要使用JDK中的JRE启动Eclipse，方法是将此类内容添加到 eclipse.ini （之前 -vmargs ！）：

To fix the issue you need to start Eclipse using the JRE from the JDK by adding something like this to eclipse.ini (before -vmargs!):

-vm
C:/<your_path_to_jdk170>/jre/bin/server/jvm.dll

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