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form:options tag cause error : Bean property is not readable or has an invalid getter method

 
albert kao
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I want to use the formptions provided by Spring to provide choices.
My JSP implemented with Spring 2.5 is



My AccountCommand.java is




My Eclipse console is:
15:55:23,140 ERROR org.springframework.web.servlet.tags.form.OptionsTag:84 - Invalid property 'billingType' of bean class [java.lang.String]: Bean property 'billingType' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
org.springframework.beans.NotReadablePropertyException: Invalid property 'billingType' of bean class [java.lang.String]: Bean property 'billingType' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:540)
at org.springframework.beans.BeanWrapperImpl.getPropertyValue(BeanWrapperImpl.java:532)
at org.springframework.web.servlet.tags.form.OptionWriter.renderFromMap(OptionWriter.java:164)
 
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