Java模块不能使用aspectj-maven-plugin

Question

我正在尝试将我的java项目迁移到11并使用模块，但似乎aspectj编译器无法识别我的maven依赖项中的模块？

错误：

mvn clean compile
[INFO] Scanning for projects...
[INFO] 
[INFO] ---------------------------< com.test:test >----------------------------
[INFO] Building test 1
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ test ---
[INFO] Deleting /Users/piotr/Documents/mvntest/target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ test ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/piotr/Documents/mvntest/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ test ---
[INFO] Required filename-based automodules detected: [passay-1.6.0.jar]. Please don't publish this project to a public artifact repository!
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to /Users/piotr/Documents/mvntest/target/classes
[INFO] 
[INFO] --- aspectj-maven-plugin:1.12.6:compile (default) @ test ---
[INFO] Showing AJC message detail for messages of types: [error, warning, fail]
[ERROR] passay cannot be resolved to a module
    /Users/piotr/Documents/mvntest/src/main/java/module-info.java:2
requires passay;
         ^

[ERROR] Must declare a named package because this compilation unit is associated to the named module 'test'
    /Users/piotr/Documents/mvntest/src/main/java/main.java:1
(no source information available)

[ERROR] The type org.passay.PasswordValidator is not accessible
    /Users/piotr/Documents/mvntest/src/main/java/main.java:1
import org.passay.PasswordValidator;
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^

[ERROR] PasswordValidator cannot be resolved to a type
    /Users/piotr/Documents/mvntest/src/main/java/main.java:5
System.out.println(new PasswordValidator());
                       ^^^^^^^^

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  2.169 s
[INFO] Finished at: 2020-12-14T10:22:00+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.nickwongdev:aspectj-maven-plugin:1.12.6:compile (default) on project test: AJC compiler errors:
[ERROR] error at requires passay;
[ERROR]          ^
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/module-info.java:2:0::0 passay cannot be resolved to a module
[ERROR] error at (no source information available)
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/main.java:1:0::0 Must declare a named package because this compilation unit is associated to the named module 'test'
[ERROR] error at import org.passay.PasswordValidator;
[ERROR]        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/main.java:1:0::0 The type org.passay.PasswordValidator is not accessible
[ERROR] error at System.out.println(new PasswordValidator());
[ERROR]                        ^^^^^^^^
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/main.java:5:0::0 PasswordValidator cannot be resolved to a type
[ERROR] 
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

pom.xml：

<?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/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.test</groupId>
    <artifactId>test</artifactId>
    <packaging>jar</packaging>
    <version>1</version>

    <properties>
        <java.version>11</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <aspectj.version>1.9.6</aspectj.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.passay</groupId>
            <artifactId>passay</artifactId>
            <version>1.6.0</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>${aspectj.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <release>${java.version}</release>
                </configuration>
            </plugin>
            <plugin>
                <groupId>com.nickwongdev</groupId>
                <artifactId>aspectj-maven-plugin</artifactId>
                <version>1.12.6</version>
                <dependencies>
                    <dependency>
                        <groupId>org.aspectj</groupId>
                        <artifactId>aspectjtools</artifactId>
                        <version>${aspectj.version}</version>
                    </dependency>
                </dependencies>
                <configuration>
                    <complianceLevel>${java.version}</complianceLevel>
                    <weaveMainSourceFolder>true</weaveMainSourceFolder>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>test-compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

src/main/java/module-info.java：

module test {
    requires passay;
}

src/main/java/main.java：

import org.passay.PasswordValidator;

public class main {
    public static void main() {
        System.out.println(new PasswordValidator());
    }
}

Answer 1

为了实现这一点，javac插件必须至少支持AspectJ编译器的命令行参数--module-info，这类似于AspectJ。该参数的存在并未记录在ajc命令行帮助中，而是间接地记录在AspectJ 1.9.0 release notes中。

我以前从未使用过Java模块，尽管我出于其他原因使用了最近的9+版本。为了找出如何从命令行编译和运行你的项目，我不得不做了一些实验，基本上是这样的：

ajc -11 --module-path "C:\Users\alexa\.m2\repository\org\passay\passay\1.6.0\passay-1.6.0.jar" -cp "C:\Users\alexa\.m2\repository\org\aspectj\aspectjrt\1.9.6\aspectjrt-1.9.6.jar" -sourceroots src\main\java -outjar target\test-1.jar

java --module-path target\test-1.jar;C:\Users\alexa\.m2\repository\org\passay\passay\1.6.0\passay-1.6.0.jar;C:\Users\alexa\.m2\repository\org\aspectj\aspectjrt\1.9.6\aspectjrt-1.9.6.jar --module test/de.scrum_master.stackoverflow.q65286736.Application

抱歉，我已经把你的主类移到了默认包之外，就像这样( main方法也是没有任何参数的伪代码)：

module test {
  requires passay;
}

package de.scrum_master.stackoverflow.q65286736;

import org.passay.PasswordValidator;

public class Application {
  public static void main(String[] args) {
    System.out.println(new PasswordValidator());
  }
}

然后，我试验性地向插件添加了一个参数javaModules，正如您在我的pull request中看到的那样。你可以通过克隆我的repository fork自己构建它。

然后像这样修改你的POM：

<?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/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <groupId>com.test</groupId>
  <artifactId>test</artifactId>
  <packaging>jar</packaging>
  <version>1</version>

  <properties>
    <java.version>11</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <aspectj.version>1.9.6</aspectj.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.passay</groupId>
      <artifactId>passay</artifactId>
      <version>1.6.0</version>
    </dependency>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
      <version>${aspectj.version}</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.1</version>
        <configuration>
          <release>${java.version}</release>
          <useIncrementalCompilation>false</useIncrementalCompilation>
        </configuration>
      </plugin>
      <plugin>
        <groupId>com.nickwongdev</groupId>
        <artifactId>aspectj-maven-plugin</artifactId>
        <version>1.12.7-SNAPSHOT</version>
        <dependencies>
          <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjtools</artifactId>
            <version>${aspectj.version}</version>
          </dependency>
        </dependencies>
        <configuration>
          <complianceLevel>${java.version}</complianceLevel>
          <encoding>${project.build.sourceEncoding}</encoding>
          <!--<weaveMainSourceFolder>true</weaveMainSourceFolder>-->
          <showWeaveInfo>true</showWeaveInfo>
          <Xlint>ignore</Xlint>
          <!--<verbose>true</verbose>-->
          <!--<warn>constructorName,packageDefaultMethod,deprecation,maskedCatchBlocks,unusedLocals,unusedArguments,unusedImport</warn>-->
          <!--<argumentFileName>argumentFileName.txt</argumentFileName>-->
          <javaModules>
            <javaModule>
              <groupId>org.passay</groupId>
              <artifactId>passay</artifactId>
            </javaModule>
          </javaModules>
        </configuration>
        <executions>
          <execution>
            <phase>process-sources</phase>
            <goals>
              <goal>compile</goal>
              <goal>test-compile</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

</project>

当然，决定性的区别在于新参数的使用：

          <javaModules>
            <javaModule>
              <groupId>org.passay</groupId>
              <artifactId>passay</artifactId>
            </javaModule>
          </javaModules>

现在项目编译完成，您也可以使用我在上面发布的第二个命令来运行应用程序，即java --module-path target\test-1.jar;...。对我来说，IntelliJ IDEA在它的POM语法突出显示中识别了新参数，并且也没有任何问题地运行应用程序。

这并不是对您能想到的所有Java模块相关参数的完全支持，但我认为这是一个起点。欢迎反馈。