在 POM 中使用 --enable-preview 执行 Maven 插件

Question

我有一个自定义 Maven 插件，它利用 JDK 12 预览功能。我将插件设置编译--enable-preview为编译器参数，即

<plugin>

    <groupId>org.apache.maven.plugins</groupId>

    <artifactId>maven-compiler-plugin</artifactId>

    <configuration>

        <compilerArgs>

            <compilerArg>--enable-preview</compilerArg>

        </compilerArgs>

    </configuration>

</plugin>

当我想执行插件时，我在 POM 中添加如下插件：

<plugin>

    <groupId>my.group</groupId>

    <artifactId>my-plugin</artifactId>

    <executions>

        <execution>

            <phase>generate-sources</phase>

            <goals>

                <goal>my-goal</goal>

            </goals>

        </execution>

    </executions>

</plugin>

但这失败了：

Preview features are not enabled for MyPluginMojo. Try running with '--enable-preview'

如何在插件执行中启用预览功能？

Answer 1

对我来说，我必须将配置文件添加到我的构建目录中：.mvn/jvm.config包含：--enable-preview这将确保 Maven 将正确的参数传递给 JVM

Answer 2

你在 pom 中犯了一个错误。<compilerArgs>采用嵌套<arg>，如下所示：&nbsp; &nbsp; &nbsp; &nbsp; <plugin>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <groupId>org.apache.maven.plugins</groupId>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <artifactId>maven-compiler-plugin</artifactId>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <version>3.8.1</version>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <configuration>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <source>17</source>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <target>17</target>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <compilerArgs>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <arg>--enable-preview</arg>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</compilerArgs>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </configuration>&nbsp; &nbsp; &nbsp; &nbsp; </plugin>

Answer 3

对于 JDK 17，这对我有用：<plugin>&nbsp; <groupId>org.apache.maven.plugins</groupId>&nbsp; <artifactId>maven-compiler-plugin</artifactId>&nbsp; <configuration>&nbsp; &nbsp; <source>17</source>&nbsp; &nbsp; <target>17</target>&nbsp; &nbsp; <compilerArgs>--enable-preview</compilerArgs>&nbsp; </configuration></plugin>