android – 尝试为GreenDAO运行DaoGenerator时出现NoClassDefFoundError

我有一个 Android项目,使用 Android Studio 2.3,它使用GreenDAO生成与sqlite数据库交互的类. DaoGenerator项目之前总是工作……但今天我只需要向实体添加2列/属性,每当我尝试运行生成器项目时,我都会收到以下错误：

Exception in thread "main" java.lang.NoClassDefFoundError: org/greenrobot/greendao/generator/Schema
    at com.company.daogenerator.ProjectDaoGenerator.main(ProjectDaoGenerator.java:20)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.lang.ClassNotFoundException: org.greenrobot.greendao.generator.Schema
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

我在我的应用程序的Gradle文件中使用GreenDAO 3.2.0：

compile 'org.greenrobot:greendao:3.2.0'

此外,在DaoGenerator的Gradle文件中：

apply plugin: 'java'

dependencies {
    compile fileTree(dir: 'libs',include: ['*.jar'])
    compile 'org.greenrobot:greendao-generator:3.2.0'
}

我的ProjectDaoGenerator.java文件：

package com.company.daogenerator;

import org.greenrobot.greendao.generator.DaoGenerator;
import org.greenrobot.greendao.generator.Entity;
import org.greenrobot.greendao.generator.Property;
import org.greenrobot.greendao.generator.Schema;

public class ProjectDaoGenerator {
    private static Entity primaryKeyEntity;
    private static Entity itemTypeEntity;

    public static void main(String args[]) throws Exception {
        Schema schema = new Schema(1,"com.company.project.datamodel");
        schema.enableKeepSectionsByDefault();

        // Define entities
        Entity primaryKey = schema.addEntity("CDPrimaryKey");
        Entity installation = schema.addEntity("CDInstallation");

        // Z_PRIMARYKEY
        primaryKeyEntity = primaryKey;
        primaryKey.setTableName("Z_PRIMARYKEY");
        primaryKey.addLongProperty("ENT").columnName("Z_ENT").primaryKey();
        primaryKey.addIntProperty("MAX").columnName("Z_MAX");
        primaryKey.addStringProperty("NAME").columnName("Z_NAME");
        primaryKey.addIntProperty("SUPER").columnName("Z_INT");

        // CDInstallation
        installation.setTableName("ZCDINSTALLATION");
        installation.addLongProperty("packageDate").columnName("ZPACKAGEDATE");

        (...) // Other Properties

        // **** Generate Schema ****
        new DaoGenerator().generateAll(schema,"app/src/main/java");
    }
}

好像它找不到org.greenrobot.greendao.generator.Schema.

解决方法

像这样设置生成器的build.gradle文件(特别注意mainClassName)：

然后单击Android Studio右侧边栏中的“Gradle”选项卡,选择daogenerator的“run”任务,如下所示：

android – 尝试为GreenDAO运行DaoGenerator时出现NoClassDefFoundError

解决方法

猜你在找的Android相关文章