Using 2.7.4 I tried to use a BeanSerializerModifier to avoid serialization
of beans meeting some condition.
This works fine. But using also identity references I run into a
NullPointerException:
at com.fasterxml.jackson.databind.ser.impl.WritableObjectId.writeAsField(
WritableObjectId.java:64)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.
_serializeWithObjectId(BeanSerializerBase.java:596)
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(
BeanSerializer.java:148)
Code to reproduce:
public class SerializationTest {
private static final String REFID_PROPERTY = "ref-id";
public static abstract class AbstractSkippable {
private String someData;
public abstract boolean hasData();
public String getSomeData() {
return someData;
}
public void setSomeData(String someData) {
this.someData = someData;
}
}
@JsonIdentityReference
@JsonIdentityInfo(property = REFID_PROPERTY, generator =
ObjectIdGenerators.UUIDGenerator.class)
public static class Data extends AbstractSkippable {
@Override
public boolean hasData() {
return true;
}
}
public static class MyData {
private Data data1;
private Data data2;
public Data getData1() {
return data1;
}
public void setData1(Data data1) {
this.data1 = data1;
}
public Data getData2() {
return data2;
}
public void setData2(Data data2) {
this.data2 = data2;
}
}
public static class AbstractSkippableSerializer extends JsonSerializer<
AbstractSkippable> {
private final JsonSerializer<Object> defaultSerializer;
public AbstractSkippableSerializer(JsonSerializer<Object>
defaultSerializer) {
if (defaultSerializer == null) {
throw new IllegalArgumentException("defaultSerializer must
not be null");
}
this.defaultSerializer = defaultSerializer;
}
@Override
public void serialize(AbstractSkippable value, JsonGenerator gen,
SerializerProvider serializers) throws IOException {
defaultSerializer.serialize(value, gen, serializers);
}
@Override
public boolean isEmpty(SerializerProvider provider,
AbstractSkippable value) {
return value == null || !value.hasData();
}
}
public static class SkippableSerializerModifier extends
BeanSerializerModifier {
@Override
public JsonSerializer<?> modifySerializer(SerializationConfig config
, BeanDescription beanDesc, JsonSerializer<?> serializer) {
Class<?> beanClass = beanDesc.getBeanClass();
if (AbstractSkippable.class.isAssignableFrom(beanClass)) {
@SuppressWarnings("unchecked")
JsonSerializer<Object> defaultSerializer = (JsonSerializer<
Object>) serializer;
return new AbstractSkippableSerializer(defaultSerializer);
}
return serializer;
}
}
@Test
public void test() throws JsonProcessingException {
JacksonXmlModule mod = new JacksonXmlModule();
mod.setSerializerModifier(new SkippableSerializerModifier());
XmlMapper mapper = new XmlMapper(mod);
MyData myData = new MyData();
Data data = new Data();
data.setSomeData("data");
myData.setData1(data);
myData.setData2(data);
String xml = mapper.writeValueAsString(data);
System.out.println(xml);
}
}
Any idea?
--Heiko
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