问题
I am trying get the AspectJ weaving working in a simple Maven project, and not sure where it is going wrong : when I run the code using "mvn exec:java", I dont see expected output.
I am sure the code is working, because I tried the same in STS, where it works fine. I just wanted to get the AspectJ working in a Maven project.
Any hints to how to debug this kind of issues will be much appreciated.
<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>
Aspect file in same folder as code :
package com.aop.aop1;
public aspect aspect {
pointcut secureAccess()
: execution(* *.foo(..));
before() : secureAccess() {
System.out.println("BEHOLD the power of AOP !!!");
}
}
Java file :
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.");
}
}
回答1:
There are several problems with your configuration:
- The aspect should be named
Aspect
with a capital "A" instead ofaspect
which is a reserved keyword. - The POM is missing a closing
</project>
tag. - The POM has a
<pluginManagement>
section, but no separate<plugins>
section, i.e. you provide defaults for your plugins, but do not actually declare that you want to use them. So either you use a stand-alone<plugins>
section without<pluginManagement>
or you redeclare the plugins in an additional<plugins>
section. - The
aspectj-maven-plugin
needs a<version>
. You forgot to specify one. - The
aspectj-maven-plugin
also needs a<complianceLevel>
configuration. - You use compile-time weaving, so you do not need the
<outxml>
setting. It is only needed for load-time weaving. - The aspectjrt dependency needs at least version 1.7.4 in order to be compatible with the version used in aspectj-maven-plugin 1.6 by default in order to compile your sources.
In addition to that, I recommend to use newer versions of Maven plugins and dependencies such as JUnit and exec-maven-plugin if you do not have any compelling reasons to use older ones. I also recommend to use the latest AspectJ version 1.8.2 and also specify to use that one internally in aspectj-maven-plugin.
Working pom.xml with minimal changes:
<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>
Working pom.xml with recommended changes:
<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>
BTW, the onejar-maven-plugin is just a goodie which I like to use in order to build a stand-alone uber JAR (a.k.a. fat JAR) containing everything you need to run the software, i.e. your classes/aspects plus the AspectJ runtime. You can just run the program with
java -jar aop1-0.0.1-SNAPSHOT.one-jar.jar
The output should be similar to mvn exec:java
just without the Maven stuff:
Hello World!
BEHOLD the power of AOP !!!
IN FOO.
来源:https://stackoverflow.com/questions/25474505/aspectj-in-maven-project-not-working-weaving