I would like to know how to copy the properties from an Object Source to an Object Dest ignoring null values using Spring Framework.
I actually use Apache beanutils, with this code
beanUtils.setExcludeNulls(true); beanUtils.copyProperties(dest, source);
to do it. But now i need to use Spring.
Any help?
Thx a lot
You can create your own method to copy properties while ignoring null values.
public static String[] getNullPropertyNames (Object source) { final BeanWrapper src = new BeanWrapperImpl(source); java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors(); Set<String> emptyNames = new HashSet<String>(); for(java.beans.PropertyDescriptor pd : pds) { Object srcValue = src.getPropertyValue(pd.getName()); if (srcValue == null) emptyNames.add(pd.getName()); } String[] result = new String[emptyNames.size()]; return emptyNames.toArray(result); } // then use Spring BeanUtils to copy and ignore null using our function public static void myCopyProperties(Object src, Object target) { BeanUtils.copyProperties(src, target, getNullPropertyNames(src)); }
Java 8 version of getNullPropertyNames method from alfredx's post:
public static String[] getNullPropertyNames(Object source) { final BeanWrapper wrappedSource = new BeanWrapperImpl(source); return Stream.of(wrappedSource.getPropertyDescriptors()) .map(FeatureDescriptor::getName) .filter(propertyName -> wrappedSource.getPropertyValue(propertyName) == null) .toArray(String[]::new); }
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