当属性值字符串与属性名称相同时，是否可以转义Maven属性插值? [英] Is it possible to escape maven property interpolation when the property value string is the same as the property name?

问题描述

我正在尝试定义一个maven属性:

I am trying to define a maven property:

<properties>
  <property>$${property}</property>
</property>

Maven尝试扩展$ {property}，但出现以下错误:

Maven tries to expand ${property} and I get the following error:

[ERROR]     Resolving expression: '${property}': Detected the
     following recursive expression cycle in 'property': [property] -> [Help 2]

我尝试了各种组合尝试逃脱它，但未成功:

I have tried all sorts of combinations to try to escape it, without success:

$$
\$
\$$

等等等

注意:当属性值与名称不同时，插值将转义.

Note: the interpolation is escaped when the property value is not the same as the name.

这可能吗?

推荐答案

由于似乎无法构建Maven属性(即使具有中间属性)，因此也许可以保留2个单独的属性并将其连接到需要的位置.假设您要填充文件中的某些属性.

Since it seems you can't build a maven property (even with intermediate properties), maybe you can keep 2 separate properties and concatenate them where you need. Let's say you want to populate some property in a file.

在POM中定义2个变量:

Define the 2 variables in the POM:

<properties>
    <property>{property}</property>
    <dollar>$</dollar>
</properties>

在文件中定义属性时同时使用两者:

use both when defining the property in the file:

# variable from file which is to be filtered
whatever=${dollar}${property}

，经过过滤后，您将得到:

and upon filtering you'll end up with:

# variable from file which is to be filtered
whatever=${property} 

---

<罢工> 使用&怎么办?这样的配置:

---

What about using &? A configuration such as:

  <properties>
      <property>&amp;{property}</property>
  </properties>

  ...

  <plugins>
        <plugin>
            <groupId>com.soebes.maven.plugins</groupId>
            <artifactId>echo-maven-plugin</artifactId>
            <version>0.2</version>
            <executions>
                <execution>
                    <phase>initialize</phase>
                    <goals>
                        <goal>echo</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <echos>
                    <echo>property=[${property}]</echo>
                </echos>
            </configuration>
        </plugin>
  </plugins>

将输出:

[INFO] --- echo-maven-plugin:0.2:echo (default) @ XXXX ---
[INFO] property=[&{property}]

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