pojo

Consider a JSON representation with one string and two arrays. For example, { "type" : "A", "ListA" : [] "ListB" : [3, 4, 5] } In the above case, type is required field, but ListA and ListB are conditionally required for deserialization based on the value of type . In other words, ListA is only required if type had value A and ListB is only required if type had a value B . Currently, I am working in Jackson and in Java, and I have been able to implement making type field mandatory by creating POJO as following: public class Example { @JsonProperty(required = true) String type; // getter and

PO（bean,entity等命名） ： persistant object持久对象，数据库表中的记录在java对象中的显示状态 最形象的理解就是一个PO就是数据库中的一条记录。 好处是可以把一条记录作为一个对象处理，可以方便的转为其它对象。 BO（service,manager,business等命名）： business object 业务对象 主要作用是把业务逻辑封装为一个对象。这个对象可以包括一个或多个其它的对象。 形象描述为一个对象的形为和动作，当然也有涉及到基它对象的一些形为和动作。比如处理 一个人的业务逻辑，有睡觉，吃饭，工作，上班等等形为还有可能和别人发关系的形为。 这样处理业务逻辑时，我们就可以针对BO去处理。 VO（from也有此写法） ： value object值对象 主要体现在视图的对象， 对于一个WEB页面 将整个页面的属性封装成一个对象。然后 用一个VO对象 在控制层与视图层进行传输交换。 DTO (经过处理后的PO，可能增加或者减少PO的属性)： Data Transfer Object数据传输对象 主要用于远程调用等需要大量传输对象的地方。 比如我们一张表有100个字段，那么对应的PO就有100个属性。 但是我们界面上只要显示10个字段， 客户端用WEB service来获取数据，没有必要把整个PO对象传递到客户端，

I'm new to the spring framework. In most of the Spring tutorials I saw, Spring is described as "non-invasive". What is meant by invasive? What are the merits of using Spring in Java and what makes it non-invasive? If an IoC container is invasive, it means your code needs to be explicitly aware of dependency injection. For example, in Guice you use the @Inject annotation (and others). These annotations are more standardized than they used to be, which is good - it means with a single set of annotations you can (at least in theory) make your code available for use with various different invasive

I am using snakeYaml to parse certain configuration/property values to a Configuration object. My yaml file looks like this - #Thread batchLimit: 1000 threadCountLimit: 2 #Some More Config key: value #MAP keyMapping: <What goes here?> My Configuration class looks like this - public class Configuration{ int batchlimit; int threadCountLimit; ... Map<String,String> keyMapping; } How do I define the keyMapping in the YAML file so it reads directly through SnakeYAML? AlexR Here is how it can look like: #MAP keyMapping: key1: value1 key2: value2 Generally YAML format has natural support of key-value