Maven + AspectJ - 配置它的所有步骤 [英] Maven + AspectJ - all steps to configure it

查看：66
本文介绍了Maven + AspectJ - 配置它的所有步骤的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在将方面应用于我的 Maven 项目时遇到问题.可能我遗漏了一些东西，所以我列出了一个步骤.你能检查一下它是否正确吗?

假设在 projectA 中是一个方面类，而在 projectB 类中，它们应该被方面改变.

  • 使用AspectJ类
    • 创建maven项目ProjectA
  • 添加Aspectj插件和依赖
  • 将 ProjectA 作为依赖添加到 projectB pom.xml
  • 添加到projectB pom.xml 插件

<groupId>org.codehaus.mojo</groupId><artifactId>aspectj-maven-plugin</artifactId><version>1.4</version><执行><执行><目标><目标>编译</目标><目标>测试编译</目标></目标></执行></执行><配置><source>${maven.compiler.source}</source><target>${maven.compiler.target}</target><方面库><方面库><groupId>ProjectA</groupId><artifactId>ProjectA</artifactId></aspectLibrary></aspectLibraries></配置></插件>

  • 添加aspectj依赖

在所有这些步骤之后，我的问题是，在编译期间我得到:

[WARNING] AspectE 中定义的建议尚未应用 [Xlint:adviceDidNotMatch]

然后当我运行我的程序时:

线程FeatureExcutionThread"中的异常 java.lang.NoClassDefFoundError: AspectE

解决方案

我追查了你的一些旧问题，试图找出你真正想要做什么.我想出了以下结构和代码，对我来说效果很好.

<前>$树..├── pom.xml├── 项目A|├── pom.xml|└── src|└── 主要|└── 方面|└── com|└── stackoverflow|└── 方面|├── AspectL.java|└── Trace.aj└── B项目├── pom.xml└── src└── 主要└── 爪哇└── com└── stackoverflow└── App.java

pom.xml

<modelVersion>4.0.0</modelVersion><groupId>org.stackoverflow</groupId><artifactId>Q12423965</artifactId><packaging>pom</packaging><version>1.0-SNAPSHOT</version><name>${project.artifactId}-${project.version}</name><属性><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.6</maven.compiler.source><maven.compiler.target>1.6</maven.compiler.target></属性><模块><module>ProjectA</module><module>ProjectB</module></模块><依赖管理><依赖项><依赖><groupId>org.stackoverflow</groupId><artifactId>Q12423965-ProjectA</artifactId><version>${project.version}</version></依赖></依赖项></dependencyManagement><构建><插件管理><插件><插件><groupId>org.codehaus.mojo</groupId><artifactId>aspectj-maven-plugin</artifactId><version>1.4</version><执行><执行><目标><目标>编译</目标><目标>测试编译</目标></目标></执行></执行><配置><source>${maven.compiler.source}</source><target>${maven.compiler.target}</target></配置></插件><插件><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>2.5.1</version><配置><source>${maven.compiler.source}</source><target>${maven.compiler.target}</target></配置></插件></插件></pluginManagement></build></项目>

ProjectA/pom.xml

<modelVersion>4.0.0</modelVersion><父母><groupId>org.stackoverflow</groupId><artifactId>Q12423965</artifactId><version>1.0-SNAPSHOT</version></父母><artifactId>Q12423965-ProjectA</artifactId><name>${project.artifactId}-${project.version}</name><依赖项><依赖><groupId>org.aspectj</groupId><artifactId>aspectjrt</artifactId><version>1.6.11</version></依赖></依赖项><构建><插件><插件><groupId>org.codehaus.mojo</groupId><artifactId>aspectj-maven-plugin</artifactId></插件></插件></build></项目>

我创造了两个不同的方面.一个使用@AspectJ 注释，另一个定义为经典的 AspectJ 方面.

AspectL.java

package com.stackoverflow.aspects;导入 org.aspectj.lang.JoinPoint;导入 org.aspectj.lang.annotation.After;导入 org.aspectj.lang.annotation.Aspect;导入 org.aspectj.lang.annotation.Before;导入 org.aspectj.lang.annotation.Pointcut;/*** @author maba, 2012-09-18*/@方面公共类 AspectL {@Pointcut("执行(* main(..))")公共无效defineEntryPoint(){}@Before("defineEntryPoint()")公共无效aaa(JoinPoint joinPoint){System.out.println("之前的方面");}@After("defineEntryPoint()")public void bbb(JoinPoint joinPoint) {System.out.println("之后的方面");}}

Trace.aj

package com.stackoverflow.aspects;公共方面跟踪{切入点 publicMethodExecuted(): execution(public !static * *(..));after(): publicMethodExecuted() {System.out.printf("进入方法:%s.
", thisJoinPoint.getSignature());Object[] arguments = thisJoinPoint.getArgs();for (int i =0; i < arguments.length; i++){对象参数 = 参数[i];如果(参数！= null){System.out.printf("参数类型为 %s，值为 %s.
", argument.getClass().toString(), argument);}}System.out.printf("退出方法:%s.
", thisJoinPoint.getSignature());}}

这两个文件是 ProjectA 模块的一部分，也是 jar 的一部分.

现在我们要使用这些方面并将它们编织到ProjectB的代码中.

ProjectB/pom.xml

<modelVersion>4.0.0</modelVersion><父母><groupId>org.stackoverflow</groupId><artifactId>Q12423965</artifactId><version>1.0-SNAPSHOT</version></父母><artifactId>Q12423965-ProjectB</artifactId><name>${project.artifactId}-${project.version}</name><依赖项><依赖><groupId>org.aspectj</groupId><artifactId>aspectjrt</artifactId><version>1.6.11</version></依赖><依赖><groupId>org.stackoverflow</groupId><artifactId>Q12423965-ProjectA</artifactId></依赖></依赖项><构建><插件><插件><groupId>org.codehaus.mojo</groupId><artifactId>aspectj-maven-plugin</artifactId><配置><方面库><方面库><groupId>org.stackoverflow</groupId><artifactId>Q12423965-ProjectA</artifactId></aspectLibrary></aspectLibraries></配置></插件><插件><groupId>org.codehaus.mojo</groupId><artifactId>exec-maven-plugin</artifactId><version>1.2.1</version><执行><执行><目标><目标>java</目标></目标></执行></执行><配置><mainClass>com.stackoverflow.App</mainClass></配置></插件></插件></build></项目>

App.java

package com.stackoverflow;/*** @author maba, 2012-09-17*/公共类应用{公共无效你好(字符串名称){}公共静态无效主(字符串 [] args){App app = new App();app.hello("世界");}}

我从顶级 pom 构建一切:

mvn 全新安装

然后进入 ProjectB 目录并运行应用程序:

mvn exec:java

结果是:

方面之前进入方法:void com.stackoverflow.App.hello(String).带有类型类 java.lang.String 和值世界的参数.退出方法:void com.stackoverflow.App.hello(String).之后的方面

因此可以得出结论，这两个方面都有效，并且 Maven 设置也有效.

I have a problem with applying aspects to my maven project. Probably I am missing something, so I've made a list of steps. Could you please check if it is correct?

Let say in projectA is an aspect class and in projectB classes, which should be changed by aspects.

  • Create maven project ProjectA with AspectJ class
  • add Aspectj plugin and dependency
  • Add ProjectA as a dependency to projectB pom.xml
  • Add to projectB pom.xml plugin

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>aspectj-maven-plugin</artifactId>
    <version>1.4</version>
    <executions>
        <execution>
            <goals>
                <goal>compile</goal>
                <goal>test-compile</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <source>${maven.compiler.source}</source>
        <target>${maven.compiler.target}</target>
        <aspectLibraries>
            <aspectLibrary>
                <groupId>ProjectA</groupId>
                <artifactId>ProjectA</artifactId>
            </aspectLibrary>
        </aspectLibraries>
    </configuration>
</plugin>

  • Add aspectj dependency

After all these steps my problem is, that during compilation I get:

[WARNING] advice defined in AspectE has not been applied [Xlint:adviceDidNotMatch]

And then when I run my program:

Exception in thread "FeatureExcutionThread" java.lang.NoClassDefFoundError: AspectE

解决方案

I traced some of your older questions to try to find out what you actually are trying to do. I have come up with the following structure and code and for me it works well.

$ tree .
.
├── pom.xml
├── ProjectA
|   ├── pom.xml
|   └── src
|       └── main
|           └── aspect
|               └── com
|                   └── stackoverflow
|                       └── aspects
|                           ├── AspectL.java
|                           └── Trace.aj
└── ProjectB
    ├── pom.xml
    └── src
        └── main
            └── java
                └── com
                    └── stackoverflow
                        └── App.java

pom.xml

<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.stackoverflow</groupId>
    <artifactId>Q12423965</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>

    <name>${project.artifactId}-${project.version}</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.6</maven.compiler.source>
        <maven.compiler.target>1.6</maven.compiler.target>
    </properties>

    <modules>
        <module>ProjectA</module>
        <module>ProjectB</module>
    </modules>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.stackoverflow</groupId>
                <artifactId>Q12423965-ProjectA</artifactId>
                <version>${project.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>aspectj-maven-plugin</artifactId>
                    <version>1.4</version>
                    <executions>
                        <execution>
                            <goals>
                                <goal>compile</goal>
                                <goal>test-compile</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        <source>${maven.compiler.source}</source>
                        <target>${maven.compiler.target}</target>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>2.5.1</version>
                    <configuration>
                        <source>${maven.compiler.source}</source>
                        <target>${maven.compiler.target}</target>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

ProjectA/pom.xml

<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.stackoverflow</groupId>
        <artifactId>Q12423965</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>Q12423965-ProjectA</artifactId>

    <name>${project.artifactId}-${project.version}</name>

    <dependencies>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.6.11</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>aspectj-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

I have created two differenct aspects. One that uses @AspectJ annotations and another one that is defined as a classic AspectJ aspect.

AspectL.java

package com.stackoverflow.aspects;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

/**
 * @author maba, 2012-09-18
 */
@Aspect
public class AspectL {

    @Pointcut("execution(* main(..))")
    public void defineEntryPoint() {
    }

    @Before("defineEntryPoint()")
    public void aaa(JoinPoint joinPoint) {
        System.out.println("aspect before");
    }

    @After("defineEntryPoint()")
    public void bbb(JoinPoint joinPoint) {
        System.out.println("aspect after");
    }
}

Trace.aj

package com.stackoverflow.aspects;

public aspect Trace {
    pointcut publicMethodExecuted(): execution(public !static * *(..));

    after(): publicMethodExecuted() {
        System.out.printf("Enters on method: %s. 
", thisJoinPoint.getSignature());

        Object[] arguments = thisJoinPoint.getArgs();
        for (int i =0; i < arguments.length; i++){
            Object argument = arguments[i];
            if (argument != null){
                System.out.printf("With argument of type %s and value %s. 
", argument.getClass().toString(), argument);
            }
        }
        System.out.printf("Exits method: %s. 
", thisJoinPoint.getSignature());
    }
}

Those two files are part of the ProjectA module and are part of a jar.

Now we want to use these aspects and weave them into the code of ProjectB.

ProjectB/pom.xml

<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.stackoverflow</groupId>
        <artifactId>Q12423965</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>Q12423965-ProjectB</artifactId>

    <name>${project.artifactId}-${project.version}</name>

    <dependencies>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.6.11</version>
        </dependency>
        <dependency>
            <groupId>org.stackoverflow</groupId>
            <artifactId>Q12423965-ProjectA</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>aspectj-maven-plugin</artifactId>
                <configuration>
                    <aspectLibraries>
                        <aspectLibrary>
                            <groupId>org.stackoverflow</groupId>
                            <artifactId>Q12423965-ProjectA</artifactId>
                        </aspectLibrary>
                    </aspectLibraries>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <version>1.2.1</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>java</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <mainClass>com.stackoverflow.App</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

App.java

package com.stackoverflow;

/**
 * @author maba, 2012-09-17
 */
public class App {

    public void hello(String name) {
    }

    public static void main(String[] args) {
        App app = new App();
        app.hello("world");
    }
}

I build everything from top pom:

mvn clean install

And then go into the ProjectB directory and run the app:

mvn exec:java

The result is:

aspect before
Enters on method: void com.stackoverflow.App.hello(String). 
With argument of type class java.lang.String and value world. 
Exits method: void com.stackoverflow.App.hello(String). 
aspect after

So to conclude both aspects are working and the maven setup also works.

这篇关于Maven + AspectJ - 配置它的所有步骤的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

查看全文
相关文章
Java开发最新文章
热门教程
热门工具
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆