我正在尝试让AspectJ编织在一个简单的Maven项目中工作,并且不确定它出错的地方: 当我使用“mvn exec:java”运行代码时,我看不到预期的输出。
我确信代码正常运行,因为我在STS中尝试了相同的功能,它可以正常工作。我只是想让AspectJ在Maven项目中工作。
非常感谢任何有关如何调试此类问题的提示。
<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>com.aop</groupId>
<artifactId>aop1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>aop1</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</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>1.7.3</version> <!-- specify your version -->
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</execution>
</executions>
<configuration>
<outxml>true</outxml>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1</version>
<configuration>
<mainClass>com.aop.aop1.App</mainClass>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
与代码位于同一文件夹中的Aspect文件:
package com.aop.aop1;
public aspect aspect {
pointcut secureAccess()
: execution(* *.foo(..));
before() : secureAccess() {
System.out.println("BEHOLD the power of AOP !!!");
}
}
Java文件:
package com.aop.aop1;
public class App
{
public static void main( String[] args )
{
System.out.println( "Hello World!" );
foo();
}
public static void foo() {
System.out.println(" IN FOO.");
}
}
答案 0 :(得分:11)
您的配置存在一些问题:
Aspect
,其大写字母为&#34; A&#34;而不是aspect
,这是一个保留关键字。</project>
标记。<pluginManagement>
部分,但没有单独的<plugins>
部分,即您为插件提供默认值,但实际上并未声明您要使用它们。因此,要么使用不带<plugins>
的独立<pluginManagement>
部分,要么在其他<plugins>
部分重新声明插件。aspectj-maven-plugin
需要<version>
。你忘了指定一个。aspectj-maven-plugin
还需要<complianceLevel>
配置。<outxml>
设置。它只需要加载时间编织。除此之外,如果您没有任何令人信服的理由,我建议使用较新版本的Maven插件和依赖项,例如 JUnit 和 exec-maven-plugin 使用较旧的。我还建议使用最新的AspectJ版本1.8.2,并指定在 aspectj-maven-plugin 中内部使用它。
使用最少的更改工作 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>com.aop</groupId>
<artifactId>aop1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>aop1</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</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>1.7.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.6</version>
<configuration>
<complianceLevel>1.7</complianceLevel>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1</version>
<configuration>
<mainClass>com.aop.aop1.App</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>
使用建议的更改 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>com.aop</groupId>
<artifactId>aop1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>AOP Sample</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<aspectj.version>1.8.2</aspectj.version>
<java.source-target.version>1.7</java.source-target.version>
</properties>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>${java.source-target.version}</source>
<target>${java.source-target.version}</target>
<!-- IMPORTANT -->
<useIncrementalCompilation>false</useIncrementalCompilation>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.6</version>
<configuration>
<showWeaveInfo>true</showWeaveInfo>
<source>${java.source-target.version}</source>
<target>${java.source-target.version}</target>
<Xlint>ignore</Xlint>
<complianceLevel>${java.source-target.version}</complianceLevel>
<encoding>UTF-8</encoding>
<verbose>true</verbose>
</configuration>
<executions>
<execution>
<!-- IMPORTANT -->
<phase>process-sources</phase>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjtools</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.3</version>
<configuration>
<mainClass>com.aop.aop1.App</mainClass>
</configuration>
</plugin>
<plugin>
<groupId>org.dstovall</groupId>
<artifactId>onejar-maven-plugin</artifactId>
<version>1.4.4</version>
<executions>
<execution>
<configuration>
<onejarVersion>0.96</onejarVersion>
<mainClass>com.aop.aop1.App</mainClass>
<attachToBuild>true</attachToBuild>
</configuration>
<goals>
<goal>one-jar</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<pluginRepositories>
<pluginRepository>
<id>OneJAR googlecode.com</id>
<url>http://onejar-maven-plugin.googlecode.com/svn/mavenrepo</url>
</pluginRepository>
</pluginRepositories>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${aspectj.version}</version>
<!--<scope>runtime</scope>-->
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
顺便说一句, onejar-maven-plugin 只是一个好东西,我喜欢用它来构建一个独立的超级JAR(又名胖JAR),其中包含运行软件所需的一切,即您的类/方面加上AspectJ运行时。你可以用运行程序
java -jar aop1-0.0.1-SNAPSHOT.one-jar.jar
输出应该与mvn exec:java
类似,只是没有Maven的东西:
Hello World!
BEHOLD the power of AOP !!!
IN FOO.