我使用哪个maven插件来实现AspectJ?

这里有一个适合我的设置(使用文档中的 aspectj-maven-plugin )

项目结构如下:

$ tree .
.
├── pom.xml
└── src
    ├── main
    │   └── java
    │       └── com
    │           └── stackoverflow
    │               └── Q3651690
    │                   ├── App.java
    │                   └── DontWriteToTheConsole.aj
    └── test
        └── java
            └── com
                └── stackoverflow
                    └── Q3651690
                        └── AppTest.java

使用以下小演示工具:

public aspect DontWriteToTheConsole {

    pointcut sysOutOrErrAccess() : get(* System.out) || get(* System.err);

    declare error
      : sysOutOrErrAccess()
      : "Don't write to the console";

}

pom.xml的配置如下:

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.stackoverflow.Q3651690</groupId>
  <artifactId>Q3651690</artifactId>
  <version>1.0-SNAPSHOT</version>
  <name>Q3651690</name>
  <properties>
    <maven.compiler.source>1.6</maven.compiler.source>
    <maven.compiler.target>1.6</maven.compiler.target>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
      <version>1.6.7</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>aspectj-maven-plugin</artifactId>
        <version>1.3</version>
        <executions>
          <execution>
            <goals>
              <goal>compile</goal><!-- to weave all your main classes -->
              <goal>test-compile</goal><!-- to weave all your test classes -->
            </goals>
          </execution>
        </executions>
        <configuration>
          <source>${maven.compiler.source}</source>
          <target>${maven.compiler.target}</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

关键部分是:

• 要为1.6源代码级配置Maven编译器插件(使用 properties )
• 为1.6源代码级配置AspectJ Maven插件(我重用了 性质 用于在此处配置Maven编译器插件)

第二步似乎是多余的,但事情就是这样。

这样,我就可以使用注释等来编织代码:

$ mvn clean install
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building Q3651690
[INFO]    task-segment: [clean, install]
[INFO] ------------------------------------------------------------------------
[INFO] [clean:clean {execution: default-clean}]
[INFO] [resources:resources {execution: default-resources}]
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/pascal/Projects/stackoverflow/Q3651690/src/main/resources
[INFO] [compiler:compile {execution: default-compile}]
[INFO] Compiling 1 source file to /home/pascal/Projects/stackoverflow/Q3651690/target/classes
[INFO] [aspectj:compile {execution: default}]
[ERROR] Don't write to the console
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Compiler errors:
error at System.out.println( "Hello World!" );
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/home/pascal/Projects/stackoverflow/Q3651690/src/main/java/com/stackoverflow/Q3651690/App.java:11:0::0 Don't write to the console
    see also: /home/pascal/Projects/stackoverflow/Q3651690/src/main/java/com/stackoverflow/Q3651690/DontWriteToTheConsole.aj:8::0
...

您可以使用maven编译器插件并将编译器更改为使用aspectj。

配置如下:

<plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>2.3.1</version>
    <configuration>
        <compilerId>aspectj</compilerId>
    </configuration>
    <dependencies>
        <dependency>
            <groupId>org.codehaus.plexus</groupId>
            <artifactId>plexus-compiler-aspectj</artifactId>
            <version>1.6</version>
        </dependency>
    </dependencies>
</plugin>

资源:

• Maven compiler plugin - Using Non-Javac Compilers .
• Compiling with AspectJ's ajc compiler from Maven

关于同一主题:

• Maven: compile aspectj project containing Java 1.6 source

我们正在使用AspectJ Maven插件构建几个大型生产级J2EE系统。最近,该插件的开发似乎没有过度活跃。最后一个版本是去年冬天,有一些严重的问题与“aspectlib”和“weavedependences”,这得到了多次报告(即使有附加的错误修复),没有任何来自上游的响应。

但是不管怎样,基本的功能正在运行,这个插件支持现实项目中需要的大量配置。

PascalThivent在上面他(非常好)的回答中展示了如何用一个特殊的依赖部分配置插件。您还可以使用此技巧配置 用于编译的实际AspectJ版本 ,因为这个插件默认使用的版本有点过时…

<project xmlns=....

<properties>
    <aspectjVer>1.6.9</aspectjVer>
    ....
    ....
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
....

<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>aspectj-maven-plugin</artifactId>
            <version>1.3</version>
            <dependencies>
                <dependency>
                    <groupId>org.aspectj</groupId>
                    <artifactId>aspectjrt</artifactId>
                    <version>${aspectjVer}</version>
                </dependency>
                <dependency>
                    <groupId>org.aspectj</groupId>
                    <artifactId>aspectjtools</artifactId>
                    <version>${aspectjVer}</version>
                </dependency>
            </dependencies>
            <configuration>
       ....
</build>
<dependencies>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjrt</artifactId>
        <version>${aspectjVer}</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId><!-- only needed if you use Spring-AOP -->
        <version>${aspectjVer}</version>
    </dependency>
    ....
    ....

注意事实 插件具有独立于项目类路径的类路径环境。因此,我们必须显式地将AspectJ运行时添加到项目依赖项中。