HBM中字段名定义应该规避的一个问题

转载自Javaeye

如果我们在HBM.XML中定义

java代码:

<property name="xRatio" type="float"/>

在创建Session的时候会告诉你Could not find a getter for xSize
经过Debug看了一下发现不是Hibernate的问题
Hibernate用的方法是

java代码:

BasicPropertyAccessor. java String methodName = methods [i ]. getName ( ); // try "get" if ( methodName. startsWith ("get" ) ) {         String testStdMethod = Introspector. decapitalize (methodName. substring ( 3 ) );         String testOldMethod = methodName. substring ( 3 );         if ( testStdMethod. equals (propertyName ) || testOldMethod. equals (propertyName ) ) return methods [i ];        }

他调用的是
Introspector.decapitalize(String name);
Sun的注释说明
but in the (unusual) special case when there is more than one character and both the first and second characters are upper case, we leave it alone.
他得到getXSize这个方法名，substring[3]为XSize然后decapitalize之后不修改首位字符，就Could not find a getter for xSize了
这个是Java Bean的Spec里面规定的。方法有多种，你可以写成xsize这种全部小写，或者加"_"字符，如果你首位大写不在第二位就没问题了。

Hibernate的FAQ里面也有记录，简单提到了这个问题

I have a property named like getAFoo() / setAFoo() and Hibernate throws a PropertyNotFoundException at startup.
Use name="AFoo" from the property name, as per the JavaBeans spec.
http://www.hibernate.org/116.html#A30