无法在groovy闭包中的newInstance中找到从此列表调用的<init>()方法

Question

我正在学习groovy,我正在尝试使用所有字段的默认值动态初始化我的类.所以我正在进行的是,我正在获取所有属性的列表并获取该对象的类型并创建该类型的对象,但我在执行时遇到错误newInstance:

Exception in thread "main" org.codehaus.groovy.runtime.metaclass.MethodSelectionException: Could not find which method <init>() to invoke from this list:
  public java.lang.Boolean#<init>(boolean)
  public java.lang.Boolean#<init>(java.lang.String)
    at groovy.lang.MetaClassImpl.chooseMethodInternal(MetaClassImpl.java:3160)
    at groovy.lang.MetaClassImpl.chooseMethod(MetaClassImpl.java:3097)
    at groovy.lang.MetaClassImpl.invokeConstructor(MetaClassImpl.java:1707)
    at groovy.lang.MetaClassImpl.invokeConstructor(MetaClassImpl.java:1526)

下面是代码

public static void init() {
        Position position1 = new Position();

        JXPathContext context = JXPathContext.newContext(position1)
        context.createPathAndSetValue('id', '2')

        position1.properties.each { Map.Entry entry ->
            String propertyName = entry.key;
            if (!propertyName.equalsIgnoreCase('class')) {
                Class clazz = position1.class.getDeclaredField(propertyName)?.type
                println "$clazz"
                Object ob = clazz.newInstance()
            }

        }
        Identifier sourceSystemPositionId = new Identifier()

        context.setValue('sourceSystemPositionId/content', 'default-content')
        context.setValue('sourceSystemPositionId/domain', 'default-domain')

        println "$position1"
    }

Answer 1

查看Java文档的java.lang.Boolean.正如您在本节中所见,Constructor Summary此类没有no-arg构造函数(这是异常消息所说的).你必须:

• 用boolean或String参数调用它(构造函数)
• 使用boolean的默认值 - 即 false
• 用Boolean.FALSE或初始化值Boolean.TRUE