Add AspectJ in Webservice

Question

i have a Java EE Webservice (REST) and would now like to use AspectJ, to create a rule that will print-out every incoming service call and their params.

I just read this tutorial and implemented the following code:

POM.XML

        <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjrt</artifactId>
        <version>1.8.10</version>
    </dependency>
    
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.8.10</version>
    </dependency>
    
</dependencies>
<build>
  <plugins>
    <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>aspectj-maven-plugin</artifactId>
        <version>1.7</version>
        <configuration>
            <complianceLevel>1.8</complianceLevel>
            <source>1.8</source>
            <target>1.8</target>
            <showWeaveInfo>true</showWeaveInfo>
            <verbose>true</verbose>
            <Xlint>ignore</Xlint>
            <encoding>UTF-8 </encoding>
        </configuration>
        <executions>
            <execution>
                <goals>
                    <!-- use this goal to weave all your main classes -->
                    <goal>compile</goal>
                    <!-- use this goal to weave all your test classes -->
                    <goal>test-compile</goal>
                </goals>
            </execution>
        </executions>
    </plugin>
</plugins>

...and created a Test.aj File, with a Pointcut which should print-out a teststring after calling the getSignOfLife():

import de.jack.businesspartner.service.BusinessPartnerServiceImpl;
public aspect TestAspectJ {

    pointcut getSignOfLife() : 
      call(void BusinessPartnerServiceImpl.getSignOfLife());

    before() : getSignOfLife() {
        System.err.println("ADKL TEST ASPECT");
    }

}

--> But nothing happens if i call the getSignOfLife() Method. Can you help me?

Answer 1

Your point cut expression may be wrong:

pointcut getSignOfLife() : 
  call(void BusinessPartnerServiceImpl.getSignOfLife());

The expression in call should match the signature of your real method.

CheckList

• return type: getSignOfLife seems has a return value, which you write a void return type in expression, which will fails the match;
• parameter type: you can use f(..) to represent a method f with any parameter, but if you left it empty, it means no parameter. If your actual method has parameter, it will fails the match;
• notice that int and Integer is different in expression, because primitives and boxing type is different;

• you need original compiler plugin of maven in your pom;

      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.1</version>
          <configuration>
              <source>1.8</source>
              <target>1.8</target>
              <encoding>UTF-8</encoding>
          </configuration>
      </plugin>
  

More

• You may refer to here if you want to dive into AspectJ
• In the most common cases, Spring AOP is enough to handle jobs like logging, auth etc, which can be used with annotation and I think, is more convenient.
• Runnable code.