Java JDK tools.jar 作为 maven 依赖
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JDK tools.jar as maven dependency
提问by Laurent
I would like to put JDK tools.jar as compile dependency. I found some examples that indicate to use the systemPathproperty like the following:
我想将 JDK tools.jar 作为编译依赖项。我发现了一些指示使用systemPath属性的示例，如下所示：
<dependency>
<groupId>com.sun</groupId>
<artifactId>tools</artifactId>
<scope>system</scope>
<systemPath>${java.home}/../lib/tools.jar</systemPath>
</dependency>
The problem is that the path is not correct for Mac Os X (however it is correct for Windows and Linux). For it, the correct path is ${java.home}/../Classes/classes.jar.
问题是路径对于 Mac Os X 不正确（但对于 Windows 和 Linux 是正确的）。对于它，正确的路径是${java.home}/../Classes/classes.jar。
I am looking for a way in order to define a maven property such that if system is detected as Mac Os X, value is set to ${java.home}/../Classes/classes.jar, otherwise it is set to ${java.home}/../lib/tools.jar(like it is possible to do with ANT). Does someone has an idea ?
我正在寻找一种方法来定义一个 maven 属性，如果系统被检测为 Mac Os X，则值设置为${java.home}/../Classes/classes.jar，否则设置为 $ {java.home}/../lib/tools.jar（就像使用 ANT 一样）。有人有想法吗？
采纳答案by Laurent
Thank you for introducing me maven profiles.
感谢您向我介绍 Maven 配置文件。
I have used profile as mentioned above and by activating a profile based on the presence of the desired file :
我已经使用了上面提到的配置文件，并根据所需文件的存在激活了一个配置文件：
<profiles>
<profile>
<id>default-profile</id>
<activation>
<activeByDefault>true</activeByDefault>
<file>
<exists>${java.home}/../lib/tools.jar</exists>
</file>
</activation>
<properties>
<toolsjar>${java.home}/../lib/tools.jar</toolsjar>
</properties>
</profile>
<profile>
<id>mac-profile</id>
<activation>
<activeByDefault>false</activeByDefault>
<file>
<exists>${java.home}/../Classes/classes.jar</exists>
</file>
</activation>
<properties>
<toolsjar>${java.home}/../Classes/classes.jar</toolsjar>
</properties>
</profile>
</profiles>
I posted this answer to highlight a mistake in the previous post : the property section can only be used in activation section in order to activate a profile based on the existence of the specified property. In order to define a property, the properties section must be used like above.
我发布这个答案是为了突出上一篇文章中的一个错误：属性部分只能在激活部分中使用，以便根据指定属性的存在来激活配置文件。为了定义一个属性，属性部分必须像上面一样使用。
回答by sblundy
That's what profiles are for, extract the path to a property, setup profiles for windows, OSX, etc, and define the property values appropriately.
这就是配置文件的用途，提取属性的路径，为 Windows、OSX 等设置配置文件，并适当地定义属性值。
Here's the doc page that discussing profiles for OSes: Maven Local Settings Model
这是讨论操作系统配置文件的文档页面：Maven Local Settings Model
It should endup looking something like this:
它最终应该看起来像这样：
<profiles>
<profile>
<id>windows_profile</id>
<activation>
<os>
<family>Windows</family>
</os>
</activation>
<properties>
<toolsjar>${java.home}/../lib/tools.jar</toolsjar>
</properties>
</profile>
<profile>
<id>osx_profile</id>
<activation>
<os>
<family>mac</family>
</os>
</activation>
<properties>
<toolsjar>${java.home}/../Classes/classes.jar</toolsjar>
</properties>
</profile>
</profiles>
回答by toTem
my solution:
我的解决方案：
- put the Sun's tools.jar to the
$JAVA_HOME/lib - make a symlink in the
$JAVA_HOME/..named lib where target will be$JAVA_HOME/lib
- 将 Sun 的 tools.jar 放到
$JAVA_HOME/lib $JAVA_HOME/..在目标将在的命名库中创建符号链接$JAVA_HOME/lib
回答by Jianyu
Hi I know you guys are all smart, but it caused me couple of days to figure out the answer is not complete - both the profile and the dependency is necessary. I hope no one will waste time on this again. Please see my complete code below:
嗨，我知道你们都很聪明，但是这让我花了几天时间才发现答案不完整 - 配置文件和依赖项都是必要的。我希望没有人会再浪费时间在这上面。请在下面查看我的完整代码：
<profiles>
<profile>
<id>osx_profile</id>
<activation>
<activeByDefault>false</activeByDefault>
<os>
<family>mac</family>
</os>
</activation>
<properties>
<toolsjar>${java.home}/../Classes/classes.jar</toolsjar>
</properties>
<dependencies>
<dependency>
<groupId>com.sun</groupId>
<artifactId>tools</artifactId>
<version>1.6.0</version>
<scope>system</scope>
<systemPath>${toolsjar}</systemPath>
</dependency>
</dependencies>
</profile>
</profiles>
回答by Animesh Sharma
Somehow, the eclipse in windows fails to pick up {java.home}. So, I had to set JAVA_HOME instead of java.home. JAVA_HOME was set in Run->Run Configurations->Environment. This worked for me with standard JDK(not Apple JDK).
不知何故，windows 中的 eclipse 无法获取 {java.home}。所以，我不得不设置 JAVA_HOME 而不是 java.home。JAVA_HOME 在 Run->Run Configurations->Environment 中设置。这对我使用标准 JDK（不是 Apple JDK）有效。
<profiles>
<profile>
<id>windows-profile</id>
<activation>
<activeByDefault>true</activeByDefault>
<file>
<exists>${JAVA_HOME}/lib/tools.jar</exists>
</file>
</activation>
<properties>
<toolsjar>${JAVA_HOME}/lib/tools.jar</toolsjar>
</properties>
</profile>
<profile>
<id>mac-profile</id>
<activation>
<activeByDefault>false</activeByDefault>
<file>
<exists>${java.home}/../lib/tools.jar</exists>
</file>
</activation>
<properties>
<toolsjar>${java.home}/../lib/tools.jar</toolsjar>
</properties>
</profile>
</profiles>
<dependencies>
<dependency>
<groupId>jdk.tools</groupId>
<artifactId>jdk.tools</artifactId>
<version>jdk1.8.0</version>
<scope>system</scope>
<systemPath>${toolsjar}</systemPath>
</dependency>
</dependencies>
回答by Marty
The comment of Edwardis correct.
爱德华的评论是正确的。
You need the profile AND you need the dependencyoutside of the profilesblock.
The profile just determines which value ${toolsjar}is gonna get.
您需要配置文件并且需要块的dependency外部profiles。配置文件只是确定${toolsjar}要获得哪个值。
<dependencies>
<dependency>
<groupId>jdk.tools</groupId>
<artifactId>jdk.tools</artifactId>
<version>jdk1.8.0</version>
<scope>system</scope>
<systemPath>${toolsjar}</systemPath>
</dependency>
</dependencies>
回答by user7610
I found a solution in Q: Declare maven dependency on tools.jar to work on JDK 9
我在 Q: Declare maven dependency on tools.jar 中找到了一个解决方案，以在 JDK 9 上工作
As the actual maven wizardry is quite elaborate, surprising to newcomers and a subject of future improvements, it is better not co copy-paste it around. Hence this module exists so you do not have to know or care about the details. ~~ https://github.com/olivergondza/maven-jdk-tools-wrapper
由于实际的 maven 巫术非常复杂，令新手感到惊讶并且是未来改进的主题，因此最好不要复制粘贴它。因此，此模块存在，因此您不必了解或关心细节。~~ https://github.com/olivergondza/maven-jdk-tools-wrapper
<dependency>
<groupId>com.github.olivergondza</groupId>
<artifactId>maven-jdk-tools-wrapper</artifactId>
<version>0.1</version>
</dependency>
回答by user889030
Proper instructions for beginners
给初学者的正确说明
First Add this profile to Pom.xml file above tag or somewhere else in it.
首先将此配置文件添加到标记上方或其他位置的 Pom.xml 文件中。
<profiles>
<profile>
<id>default-profile</id>
<activation>
<activeByDefault>true</activeByDefault>
<file>
<exists>${java.home}/../lib/tools.jar</exists>
</file>
</activation>
<properties>
<toolsjar>${java.home}/../lib/tools.jar</toolsjar>
</properties>
</profile>
<profile>
<id>mac-profile</id>
<activation>
<activeByDefault>false</activeByDefault>
<file>
<exists>${java.home}/../Classes/classes.jar</exists>
</file>
</activation>
<properties>
<toolsjar>${java.home}/../Classes/classes.jar</toolsjar>
</properties>
</profile>
</profiles>
then Correct JRE path
然后更正JRE路径
Goto :
去 ：
Windows > Preferecnes > Installed JREs
Windows > Preferecnes > 已安装的 JRE
selected intalled JRE and double click on it or from right menu click edit and then make sure JRE Home path is inside JDK something like:
选择安装的 JRE 并双击它或从右键菜单中单击编辑，然后确保 JRE 主路径在 JDK 中，例如：
C:\Program Files\Java\jdk1.8.0_181\jre
C:\Program Files\Java\jdk1.8.0_181\jre
if you have installed JRE seperatly then eclipse would have picked standalone JRE like:
如果您单独安装了 JRE，那么 eclipse 会选择独立的 JRE，例如：
C:\Program Files\Java\jre1.8.0_181\
C:\Program Files\Java\jre1.8.0_181\
so change it to JRE which come with JDK:
所以把它改成JDK自带的JRE：
C:\Program Files\Java\jdk1.8.0_181\jre
C:\Program Files\Java\jdk1.8.0_181\jre
