A spring bean validation tool with the Spring Expression Language (SpEL), which is a powerful expression language that supports querying and manipulating an object graph at runtime.

It supports validation on various kind of Spring bean properties from String to collection of String and nested property. Multiple rules can be applied on a particular property. Conditional rule is also supported, that means the rules on a particular property will be applied only if the rule of other property is met.

It provides Spring XML configuration to set up the validation rules which make them clear to read and convenient to change with no compilation required.

Three different kind of validators are provided in this library.

Each validation result is stored in ValidationResult as property invalid. If validation is failed, it stores a list of ValidationFailed objects, and they will be aggregated by ValidationResultReducer to return a single ValidationResult.

ValidationCondition:

Assign targetProperty to Spring bean property.

Assign validator rules on conditions value, multiple rules can be set with line separator \n.

Example:

<bean id="basicValidator" class="com.horacehylee.validator.validator.ValidationCondition">
    <property name="targetProperty" value="testObject"/>
    <property name="conditions">
        <value>
            <![CDATA[
                id != null
                num > 0
            ]]>
        </value>
    </property>
</bean>