greendao - DaoGenerator 抛出异常

Question

我刚开始使用 greenDao，但我无法初始化 DaoGenerator：调用new DaoGenerator();会引发异常

de.greenrobot.daogenerator.DaoGenerator.(DaoGenerator.java:60) 处的 java.lang.ExceptionInInitializerError

这是我的代码：

    Schema schema = new Schema(1,"com.emt.testdb.greendao");
    schema.setDefaultJavaPackageTest("com.emt.testdb.greendao.test");
    schema.setDefaultJavaPackageDao("com.emt.testdb.greendao.dao");
    Entity user = schema.addEntity("User");
    user.addIdProperty();
    user.addStringProperty("name");
    user.addStringProperty("password");
    user.addIntProperty("yearOfBirth");
    DaoGenerator daoGenerator = null;
    try
    {
        daoGenerator = new DaoGenerator();
       // daoGenerator.generateAll(schema, "../project/src-gen");
    } catch (IOException e)
    {
        e.printStackTrace();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }

非常感谢您的帮助！