无法在Maven插件上使用注释设置参数 [英] Cannot set parameter using annotations on a maven plugin
问题描述
我正在尝试开发一个Maven插件,当我使用@Parameter注释时,它不起作用.
I'm trying to develop a maven plugin and it does not work when I use @Parameter annotation.
我的依赖项:
...
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>3.2.3</version>
</dependency>
<dependency>
<groupId>org.apache.maven.plugin-tools</groupId>
<artifactId>maven-plugin-annotations</artifactId>
<version>3.3</version>
</dependency>
...
当我使用时:
@Parameter (property = "resources")
protected String resources;
资源保留为空,当我用以下方法更改时:
resources are kept as null, and when I change it with:
/**
* @parameter expression="${resources}"
*/
protected String resources;
资源得到满足.我将插件执行为:
resources get fulfilled. I execute my plugin as:
mvn example:goal -Dresources=whatever
这是我的Mojo声明:
And this is my Mojo declaration:
@Mojo(name = "example", defaultPhase = LifecyclePhase.PROCESS_RESOURCES)
public class ExampleMojo extends AbstractMojo {
任何想法为什么会发生这种情况,我该怎么做才能使此批注按预期工作?
Any ideas why does this happens and what do I have to do to get this annotation working as expected?
推荐答案
好,我有两个问题.我的一个原因和一个比此处安装的版本更新的mvn版本中解决的已知错误.
Well, I had two problems. One cause by me and one a known bug solved in a newer version of mvn than the one installed here.
首先由我引起的问题:实际上我的Mojo声明是这样的:
First the problem caused by me: Actually my Mojo declaration was this:
/**
* my goal
*
* @goal example
* @phase process-sources
*/
@Mojo(name = "example", defaultPhase = LifecyclePhase.PROCESS_RESOURCES)
public class ExampleMojo extends AbstractMojo {
由于使用@goal和@phase进行注释,这使我的插件正常工作.所以我以为@Mojo在做这项工作,但是我错了.
This made my plugin work due to the comments with @goal and @phase. SO I thought @Mojo was doing the job, but I was wrong.
第二个问题是这个已知的错误: http://jira.codehaus.org/browse/MNG-5346
The second issue is this known bug: http://jira.codehaus.org/browse/MNG-5346
有一些解决方案,例如向mojo的pom添加maven-plugin-plugin依赖关系和一些描述符.但是我选择将Maven更新到3.2.3,并删除了带注释的注释(@goal和@phase),一切都按预期开始工作.
There are a few solutions, like adding maven-plugin-plugin dependency and a few descriptors to the mojo's pom. But I chose to update my maven to 3.2.3 and removed the annotated comments (@goal and @phase) and everything started to work as expected.
现在我的魔力像这样:
@Mojo(name = "example", defaultPhase = LifecyclePhase.PROCESS_RESOURCES)
public class ExampleMojo extends AbstractMojo {
@Parameter(property = "resources")
protected String resources;
/**
* do something nice
* @throws MojoExecutionException
*/
public void execute() throws MojoExecutionException {
System.out.println(resources);
}
}
为了完整起见,这是我的pom:
And for the sake of completeness this is my pom:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.package</groupId>
<artifactId>example</artifactId>
<packaging>maven-plugin</packaging>
<version>0.1-SNAPSHOT</version>
<name>Maven Mojo</name>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<encoding>UTF-8</encoding>
<showDeprecation>true</showDeprecation>
<compilerArgument>-Xlint:all,-serial</compilerArgument>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>3.2.3</version>
</dependency>
<dependency>
<groupId>org.apache.maven.plugin-tools</groupId>
<artifactId>maven-plugin-annotations</artifactId>
<version>3.3</version>
</dependency>
</dependencies>
</project>
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