alibaba/nacos · error · NacosDeserializationException

101

101

Error message

Nacos deserialize for class [%s] failed, cause error[%s]. 

What it means

Error "Nacos deserialize for class [%s] failed, cause error[%s]. " thrown in alibaba/nacos.

Source

Thrown at common/src/main/java/com/alibaba/nacos/common/utils/JacksonUtils.java:96

        } catch (JsonProcessingException e) {
            throw new NacosSerializationException(obj.getClass(), e);
        }
    }
    
    /**
     * Json string deserialize to Object.
     *
     * @param json json string
     * @param cls  class of object
     * @param <T>  General type
     * @return object
     * @throws NacosDeserializationException if deserialize failed
     */
    public static <T> T toObj(byte[] json, Class<T> cls) {
        try {
            return mapper.readValue(json, cls);
        } catch (Exception e) {
            throw new NacosDeserializationException(cls, e);
        }
    }
    
    /**
     * Json string deserialize to Object.
     *
     * @param json json string
     * @param cls  {@link Type} of object
     * @param <T>  General type
     * @return object
     * @throws NacosDeserializationException if deserialize failed
     */
    public static <T> T toObj(byte[] json, Type cls) {
        try {
            return mapper.readValue(json, mapper.constructType(cls));
        } catch (Exception e) {
            throw new NacosDeserializationException(e);
        }

View on GitHub (pinned to 9b989acdf1)

Solutions

1. Inspect the server logs for the underlying cause, fix it, and retry the operation.

When it happens

Trigger: Thrown at common/src/main/java/com/alibaba/nacos/common/utils/JacksonUtils.java:96 when the library encounters an invalid state.

Common situations: Jackson failed to deserialize JSON into the target class.

AI-assisted analysis of alibaba/nacos@9b989acdf1 (2026-08-14). Data as JSON: /api/errors/c4d98c9779cc5353. Report an issue: GitHub.