java - 带有 OpenJDK 11 且没有 Spring Context 的 AspectJ 1.9.4 无法作为依赖模块工作

Question

我正在尝试使用 AspectJ 创建自定义加载时注释，在没有 Spring Context 的情况下打开 JDK11。它在模块内运行良好，注释在类加载时编织，方面在运行时执行。没问题，但是当aspectJ实现模块添加为对另一个模块的依赖时。 AspectJ 和注释不处理。我是否缺少任何配置？

模块-a

@Documented
@Inherited
@Target(METHOD)
@Retention(RUNTIME)
public @interface Counter {
    String name() default "";
}

@Aspect
public class CounterAspect {
    @Around("execution(* *.*(..)) && @annotation(counter)")
    public void myBeforeLogger(ProceedingJoinPoint joinPoint, Counter counter) {

        System.out.println("Okay - we're in the before handler...");
        System.out.println("The test annotation value is: " + counter.name().toString());
}

资源/META-INF/aop.xml

<aspectj>
    <aspects>
        <aspect name="CounterAspect"/>
    </aspects>
    <weaver options="-verbose">
        <!-- weave anything -->
        <include within="*" />
    </weaver>
</aspectj>

pom.xml

<properties>
    <aspectj.version>1.9.4</aspectj.version>
</properties>
<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>${aspectj.version}</version>
</dependency>
<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>aspectj-maven-plugin</artifactId>
            <version>1.11</version>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.9</version>
            <configuration>
                <argLine>
                -javaagent:${settings.localRepository}/org/aspectj/aspectjweaver/${aspectj.version}/aspectjweaver-${aspectj.version}.jar
                </argLine>
            </configuration>
            <dependencies>
                <dependency>
                    <groupId>org.aspectj</groupId>
                    <artifactId>aspectjweaver</artifactId>
                    <version>${aspectj.version}</version>
                </dependency>
            </dependencies>
        </plugin>
    </plugins>
</build>

模块-b

pom.xml

<dependency>
    <groupId>org.mymodule</groupId>
    <artifactId>module-a</artifactId>
    <version>1.0.0</version>
</dependency>

public class MyCounter {
    @Counter(name="call_count")
    public void count() {}
}

public class MyCounterTest {
    @Test
    public void testCount() {
        MyCounter counter = new MyCounter();
        counter.count();
        //NOTE: I expect CounterAspect from module-a should be intercepted. It is not working!!!! There is no aspectJ class loading verbose in console.
    }
}

Answer 1

我建议您创建一个包含一些预定义属性、依赖版本和插件配置的父 POM。您的两个子模块(一个用于应用程序 + 测试，一个用于方面)可以使用这些定义，这会导致子模块 POM 更短:

<?xml version="1.0" encoding="UTF-8"?>
<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>de.scrum-master</groupId>
  <artifactId>aspectj-ltw-test-multi-module</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>pom</packaging>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.source-target.version>11</java.source-target.version>
    <aspectj.version>1.9.4</aspectj.version>
  </properties>

  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.3</version>
          <configuration>
            <source>${java.source-target.version}</source>
            <target>${java.source-target.version}</target>
            <!-- IMPORTANT -->
            <useIncrementalCompilation>false</useIncrementalCompilation>
          </configuration>
        </plugin>
        <plugin>
          <groupId>com.nickwongdev</groupId>
          <artifactId>aspectj-maven-plugin</artifactId>
          <version>1.12.1</version>
          <configuration>
            <!--<showWeaveInfo>true</showWeaveInfo>-->
            <source>${java.source-target.version}</source>
            <target>${java.source-target.version}</target>
            <Xlint>ignore</Xlint>
            <complianceLevel>${java.source-target.version}</complianceLevel>
            <encoding>${project.build.sourceEncoding}</encoding>
            <!--<verbose>true</verbose>-->
            <!--<warn>constructorName,packageDefaultMethod,deprecation,maskedCatchBlocks,unusedLocals,unusedArguments,unusedImport</warn>-->
          </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>${aspectj.version}</version>
            </dependency>
            <dependency>
              <groupId>org.aspectj</groupId>
              <artifactId>aspectjweaver</artifactId>
              <version>${aspectj.version}</version>
            </dependency>
          </dependencies>
        </plugin>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.9</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>${aspectj.version}</version>
      </dependency>
      <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjrt</artifactId>
        <version>${aspectj.version}</version>
      </dependency>
      <dependency>
        <groupId>de.scrum-master</groupId>
        <artifactId>aspect</artifactId>
        <version>1.0-SNAPSHOT</version>
      </dependency>
      <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

  <modules>
    <module>aspect</module>
    <module>application</module>
  </modules>

</project>

请注意，我没有使用原始的 AspectJ Maven 插件，而是使用支持 Java 11 的分支。原始版本仍然落后。正如您所说，您想使用 Java 11，您必须这样做。使用 Java 8，您可以使用原始插件。

方面模块:

<?xml version="1.0" encoding="UTF-8"?>
<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>de.scrum-master</groupId>
    <artifactId>aspectj-ltw-test-multi-module</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>

  <groupId>de.scrum-master</groupId>
  <artifactId>aspect</artifactId>
  <version>1.0-SNAPSHOT</version>

  <build>
    <plugins>
      <plugin>
        <groupId>com.nickwongdev</groupId>
        <artifactId>aspectj-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

  <dependencies>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
    </dependency>
  </dependencies>
</project>

<aspectj>
  <aspects>
    <aspect name="de.scrum_master.aspect.CounterAspect"/>
  </aspects>
  <weaver options="-verbose">
    <!-- weave anything -->
    <include within="*"/>
  </weaver>
</aspectj>

package de.scrum_master.aspect;

import java.lang.annotation.Documented;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Documented
@Inherited
@Target(METHOD)
@Retention(RUNTIME)
public @interface Counter {
  String name() default "";
}

package de.scrum_master.aspect;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;

@Aspect
public class CounterAspect {
  @Around("execution(* *.*(..)) && @annotation(counter)")
  public void myBeforeLogger(ProceedingJoinPoint joinPoint, Counter counter) {
    System.out.println(joinPoint + " -> " + counter.name());
  }
}

应用模块:

<?xml version="1.0" encoding="UTF-8"?>
<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>de.scrum-master</groupId>
    <artifactId>aspectj-ltw-test-multi-module</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>

  <groupId>de.scrum-master</groupId>
  <artifactId>application</artifactId>
  <version>1.0-SNAPSHOT</version>

  <dependencies>
    <dependency>
      <groupId>de.scrum-master</groupId>
      <artifactId>aspect</artifactId>
    </dependency>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <configuration>
          <argLine>
            -javaagent:${settings.localRepository}/org/aspectj/aspectjweaver/${aspectj.version}/aspectjweaver-${aspectj.version}.jar
          </argLine>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

package de.scrum_master.app;

import de.scrum_master.aspect.Counter;

public class MyCounter {
  @Counter(name = "call_count")
  public void count() {}
}

package de.scrum_master.app;

import org.junit.Test;

public class MyCounterTest {
  @Test
  public void testCount() {
    new MyCounter().count();
  }
}

现在，如果您运行 mvn clean verify 或只是 mvn clean test，您将获得以下应用程序模块测试的控制台日志:

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
[AppClassLoader@2aae9190] info AspectJ Weaver Version 1.9.4 built on Friday May 10, 2019 at 08:43:10 PDT
[AppClassLoader@2aae9190] info register classloader jdk.internal.loader.ClassLoaders$AppClassLoader@2aae9190
[AppClassLoader@2aae9190] info using configuration (...)/SO_AJ_LTWTestMultiModule_56397605/aspect/target/classes/META-INF/aop.xml
[AppClassLoader@2aae9190] info register aspect de.scrum_master.aspect.CounterAspect
[IsolatedClassLoader@74e52ef6] info AspectJ Weaver Version 1.9.4 built on Friday May 10, 2019 at 08:43:10 PDT
[IsolatedClassLoader@74e52ef6] info register classloader org.apache.maven.surefire.booter.IsolatedClassLoader@74e52ef6
[IsolatedClassLoader@74e52ef6] info using configuration (...)/SO_AJ_LTWTestMultiModule_56397605/aspect/target/classes/META-INF/aop.xml
[IsolatedClassLoader@74e52ef6] info register aspect de.scrum_master.aspect.CounterAspect
Running de.scrum_master.app.MyCounterTest
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access using Lookup on org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor (file:/(...)/.m2/repository/org/aspectj/aspectjweaver/1.9.4/aspectjweaver-1.9.4.jar) to class java.lang.ClassLoader
WARNING: Please consider reporting this to the maintainers of org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[AppClassLoader@2aae9190] info processing reweavable type de.scrum_master.aspect.CounterAspect: de\scrum_master\aspect\CounterAspect.aj
[AppClassLoader@2aae9190] info successfully verified type de.scrum_master.aspect.CounterAspect exists.  Originates from de\scrum_master\aspect\CounterAspect.aj
execution(void de.scrum_master.app.MyCounter.count()) -> call_count
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.885 sec

请特别注意

execution(void de.scrum_master.app.MyCounter.count()) -> call_count

这就是您想要的，加载时间编织方面将在您的测试中发挥作用。

<小时/>

更新:我创建了 GitHub repository为你。您可以克隆它，而不用复制此答案中的所有代码片段。