This happens if you leave the event.title field null, or set it to an empty string.
如果让event . title字段为空，或者将它设置为空字符串就会出现这种情况。
This field will always have the value null after unmarshalling because.
在去除编组之后的字段值将一直保持是空值，因为它的值没有被序列化或反序列化。
The corresponding field in the business object is automatically set to null.
业务对象中的对应字段将自动设置为空。
They have a field that is null.
它们拥有一个值为null的字段。
NOT NULL - a NULL was found in field name.
NOTNULL——字段名中出现空值。
Every match sets a field to the captured result; every miss is set to null.
每个匹配都会把捕获结果设置到到对应的字段去；要是没有捕捉到就设为null。
A new field with null value will give you an error.
一个空值的新领域，将给你一个错误。
A new field with null value will give you an error.
一个空值的新领域，将给你一个错误。
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