[#13768] URI should be deserialized from empty string to null.

See FasterXML/jackson-databind#398, but we
don't need this edge case handling, client sends empty selection as
empty string, so this should be handled as null.

api/src/main/java/org/smartbit4all/core/object/ObjectSerializerByObjectMapper.java

@@ -3,6 +3,7 @@
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
+import java.net.URI;
 import java.nio.charset.StandardCharsets;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
@@ -14,8 +15,9 @@
 import org.slf4j.LoggerFactory;
 import org.smartbit4all.api.binarydata.BinaryData;
 import org.smartbit4all.api.binarydata.BinaryDataOutputStream;
-import org.smartbit4all.core.object.zone.ZonedLocalDateDeserializer;
-import org.smartbit4all.core.object.zone.ZonedLocalDateTimeDeserializer;
+import org.smartbit4all.core.object.serialize.UriDeserializer;
+import org.smartbit4all.core.object.serialize.ZonedLocalDateDeserializer;
+import org.smartbit4all.core.object.serialize.ZonedLocalDateTimeDeserializer;
 import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
@@ -51,6 +53,7 @@ public ObjectSerializerByObjectMapper() {
     SimpleModule module = new SimpleModule();
     module.addDeserializer(LocalDate.class, ZonedLocalDateDeserializer.INSTANCE);
     module.addDeserializer(LocalDateTime.class, ZonedLocalDateTimeDeserializer.INSTANCE);
+    module.addDeserializer(URI.class, UriDeserializer.INSTANCE);
     objectMapper.registerModule(module);
     // Task 5641: Storage - OffsetDateTime formatting with default serializer
     objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

api/src/main/java/org/smartbit4all/core/object/serialize/UriDeserializer.java

@@ -0,0 +1,31 @@
+package org.smartbit4all.core.object.serialize;
+
+import java.io.IOException;
+import java.net.URI;
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+
+public class UriDeserializer extends JsonDeserializer<URI> {
+
+  public static final UriDeserializer INSTANCE =
+      new UriDeserializer();
+
+  private UriDeserializer() {}
+
+  @Override
+  public URI deserialize(JsonParser p, DeserializationContext ctxt)
+      throws IOException, JsonProcessingException {
+    String text = p.getValueAsString();
+    if (text != null) {
+      if (text.length() == 0 || (text = text.trim()).length() == 0) {
+        // we don't want to treat "" as a valid URI
+        return null;
+      }
+      return URI.create(text);
+    }
+    return null;
+  }
+
+}

api/src/main/java/org/smartbit4all/core/object/zone/ZonedLocalDateDeserializer.java → api/src/main/java/org/smartbit4all/core/object/serialize/ZonedLocalDateDeserializer.java

@@ -1,4 +1,4 @@
-package org.smartbit4all.core.object.zone;
+package org.smartbit4all.core.object.serialize;
 
 import java.io.IOException;
 import java.time.DateTimeException;

api/src/main/java/org/smartbit4all/core/object/zone/ZonedLocalDateTimeDeserializer.java → api/src/main/java/org/smartbit4all/core/object/serialize/ZonedLocalDateTimeDeserializer.java

@@ -1,4 +1,4 @@
-package org.smartbit4all.core.object.zone;
+package org.smartbit4all.core.object.serialize;
 
 import java.io.IOException;
 import java.time.DateTimeException;