java: Annotation processing is not supported for module cycles. Please ensure that all modules from cycle [jeecg-system-biz,jeecg-module-demo] are excluded from annotation processing

这个错误通常是由于 Java 9 中新增的模块系统引起的。可能是因为你的项目中存在循环依赖，而循环依赖在模块系统中是不被允许的。解决这个问题的方法是将这些循环依赖的模块从注解处理中排除掉。你可以在 Maven 或 Gradle 的配置文件中添加以下代码：

Maven：

<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.8.0</version>
      <configuration>
        <annotationProcessorPaths>
          <path>
            <groupId>com.google.auto.service</groupId>
            <artifactId>auto-service</artifactId>
            <version>1.0-rc7</version>
          </path>
          <path>
            <groupId>com.squareup</groupId>
            <artifactId>javapoet</artifactId>
            <version>1.11.1</version>
          </path>
        </annotationProcessorPaths>
        <compilerArgs>
          <arg>--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED</arg>
          <arg>--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED</arg>
          <arg>--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED</arg>
          <arg>--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED</arg>
          <arg>--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED</arg>
        </compilerArgs>
        <compilerArgs>
          <arg>--add-modules=java.xml.bind</arg>
        </compilerArgs>
        <compilerArgs>
          <arg>-AinheritedAnnotationClassNames=javax.persistence.Entity</arg>
        </compilerArgs>
        <compilerArgs>
          <arg>-AinheritedAnnotationClassNames=javax.persistence.MappedSuperclass</arg>
        </compilerArgs>
        <compilerArgs>
          <arg>-AinheritedAnnotationClassNames=javax.persistence.Embeddable</arg>
        </compilerArgs>
        <compilerArgs>
          <arg>-AinheritedAnnotationClassNames=javax.persistence.EmbeddedId</arg>
        </compilerArgs>
        <compilerArgs>
          <arg>-AinheritedAnnotationClassNames=javax.persistence.Id</arg>
        </compilerArgs>
        <compilerArgs>
          <arg>-AinheritedAnnotationClassNames=javax.persistence.Version</arg>
        </compilerArgs>
      </configuration>
    </plugin>
  </plugins>
</build>

Gradle：

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
    api {}
}

dependencies {
    annotationProcessor 'com.google.auto.service:auto-service:1.0-rc7'
    compileOnly 'com.google.auto.service:auto-service:1.0-rc7'
}

compileJava {
    options.annotationProcessorPath = configurations.annotationProcessor
    options.compilerArgs = [
            "--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED",
            "--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED",
            "--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED",
            "--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED",
            "--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED",
            "--add-modules=java.xml.bind",
            "-AinheritedAnnotationClassNames=javax.persistence.Entity",
            "-AinheritedAnnotationClassNames=javax.persistence.MappedSuperclass",
            "-AinheritedAnnotationClassNames=javax.persistence.Embeddable",
            "-AinheritedAnnotationClassNames=javax.persistence.EmbeddedId",
            "-AinheritedAnnotationClassNames=javax.persistence.Id",
            "-AinheritedAnnotationClassNames=javax.persistence.Version"
    ]
}

如果你使用的是其他的构建工具或 IDE，可以按照类似的方式进行配置。希望这能帮到你。