Delegating creator fails to work for binary data (byte[]) with binary formats (CBOR, Smile) #1711
Description
Jackson Versions: 2.8.9, 2.9.0.pr4
This issue might belong to jackson-dataformats-binary.
I created a class which is basically a wrapper around a byte[], using @JsonValue and @JsonCreator.
This works fine using the default JsonFactory, however when using a SimleFactory or CBORFactory (and probably others) the deserialization fails: It returns a byte[] instead of the expected target class (which causes a ClassCastException in the calling code).
This problem only occurs with byte[]. Other types such as int[], String[] or byte[][] are fine.
public class TestByteArray {
private static class ByteArray {
private final byte[] val;
@JsonCreator public ByteArray(byte[] val) { this.val = val;}
@JsonValue public byte[] getValue() { return val;}
}
public static void main(String[] args) throws IOException {
//This works fine
test(new ObjectMapper(new JsonFactory()));
//This throws java.lang.ClassCastException: [B cannot be cast to TestByteArray$ByteArray
test(new ObjectMapper(new SmileFactory()));
System.out.println("No exception thrown.");
}
private static void test(ObjectMapper mapper) throws IOException {
byte[] bytes = {1, 2, 3, 4, 5};
ByteArray read = mapper.readValue(mapper.writeValueAsBytes(new ByteArray(bytes)), ByteArray.class);
if (!Arrays.equals(bytes, read.val))
throw new IllegalStateException("Arrays not equal");
}
}