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    <p>IMO, the simplest solution is to create a separate java class say <code>Money</code> that holds both information, the type of money (i.e. Currency) and the value of money.</p> <pre><code>public class Money { private Currency currency; private Double value; public Currency getCurrency() { return currency; } public void setCurrency(Currency currency) { this.currency = currency; } public Double getValue() { return value; } public void setValue(Double value) { this.value = value; } public boolean isValid() { if(getCurrency() == null || getValue() == null) { return false; } // critical logic goes here // sample code if("JPY".equalsIgnoreCase(currency.getCurrencyCode())) { int intValue = getValue().intValue(); double diff = getValue() - intValue; if(diff &gt; 0) { return false; } } /*double fractionValue = value - (value % (currency.getDefaultFractionDigits() * 10)); if(fractionValue &gt; currency.getDefaultFractionDigits() * 10) { return false; }*/ return true; } } </code></pre> <p>After this, create a constraint say <code>@ValidMoney</code> and <code>MoneyValidator</code>.</p> <pre><code>public class MoneyValidator implements ConstraintValidator&lt;ValidMoney, Money&gt; { @Override public void initialize(ValidMoney constraintAnnotation) { // TODO Auto-generated method stub } @Override public boolean isValid(Money value, ConstraintValidatorContext context) { return value.isValid(); } } </code></pre> <p>Example:-</p> <pre><code>public class Bid { @ValidMoney private Money bidAmount; } </code></pre>
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    1. POJSR-303: Yet Another Cross-field Validation Problem
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    1. USDipesh Rathod
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    1. COThis. Also, never use double or float for monetary values, use a long that counts the smallest denomination for the given currenc.
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      1. USTassos Bassoukos
    2. COI thought about this solution actually but wanted to stick with a primitive type because it will be used in persistent classes. You can persist a custom type in Hibernate by implementing a few interfaces but wasn't sure that would be necessary. Thanks nontheless.
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      1. USTom Tucker
    3. COBTW, you probaly may get rid of `MoneyValidator` and replace it by `@Valid` annotation in `Bid` class and `@AssertTrue` for `Money.isValid()`
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      1. USSlava Semushin
 

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