apache/dolphinscheduler · error · RuntimeException

java.lang.CloneNotSupportedException

Error message

java.lang.CloneNotSupportedException

What it means

getFavTaskList clones FavTaskDto instances via e.clone(), and if the clone operation raises CloneNotSupportedException the code wraps it in a RuntimeException, surfacing as 'java.lang.CloneNotSupportedException'. This happens when FavTaskDto does not properly implement Cloneable, so Object.clone() refuses to copy it.

Solutions

  1. Make FavTaskDto implement Cloneable (and keep super.clone()), or better, replace the clone() call with a copy constructor / explicit field copy.
  2. Fix the DTO class in the source tree; this is a code defect, not a runtime configuration issue.
  3. Upgrade to a version where the clone usage is removed.

Example fix

// before
FavTaskDto clone = (FavTaskDto) e.clone();
// after (copy constructor)
FavTaskDto clone = new FavTaskDto(e);
clone.setCollection(userFavTaskTypes.contains(clone.getTaskType()));
Defensive patterns

Strategy: try-catch

Try / catch

try { return getFavTaskList(loginUser); } catch (RuntimeException e) { if (e.getCause() instanceof CloneNotSupportedException) { /* rebuild fav list without clone, or report DTO defect */ } else throw e; }

Prevention

When it happens

Trigger: Calling getFavTaskList when FavTaskDto (or the element being cloned) fails to implement java.lang.Cloneable — Object.clone() throws and the catch block rethrows it as RuntimeException.

Common situations: Refactoring FavTaskDto (e.g. removing Cloneable or changing hierarchy) breaks clone-based copying; running a build where the DTO was modified without re-checking the clone contract.

Understand the failure class

Background: "This is a bug, please report it": internal invariant violations, unreachable panics, and SNH errors explained — this error's family across 47 libraries.

Related errors

AI-assisted analysis of apache/dolphinscheduler@02eac45a1b (2026-09-06). Data as JSON: /api/errors/2379763c4a374a7a. Report an issue: GitHub.

Appendix: source

Thrown at dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/FavTaskServiceImpl.java:58

    @Resource
    private FavTaskMapper favMapper;

    @Override
    public List<FavTaskDto> getFavTaskList(User loginUser) {
        Set<String> userFavTaskTypes = favMapper.getUserFavTaskTypes(loginUser.getId());

        List<FavTaskDto> defaultTaskTypes = taskTypeConfiguration.getDefaultTaskTypes();
        List<FavTaskDto> result = new ArrayList<>();
        // clone default list and modify fav task type flag
        defaultTaskTypes.forEach(e -> {
            try {
                FavTaskDto clone = (FavTaskDto) e.clone();
                if (userFavTaskTypes.contains(clone.getTaskType())) {
                    clone.setCollection(true);
                }
                result.add(clone);
            } catch (CloneNotSupportedException ex) {
                throw new RuntimeException(ex);
            }
        });
        return result;
    }

    @Override
    public boolean deleteFavTask(User loginUser, String taskType) {
        return favMapper.deleteUserFavTask(loginUser.getId(), taskType);
    }

    @Override
    public int addFavTask(User loginUser, String taskType) {
        favMapper.deleteUserFavTask(loginUser.getId(), taskType);
        return favMapper.insert(new FavTask(null, taskType, loginUser.getId()));
    }
}

View on GitHub (pinned to 02eac45a1b)