apache/iceberg · error · UnsupportedOperationException

"Snapshot validation not supported by " +…

Error message

"Snapshot validation not supported by " + this.getClass().getName()

What it means

Default-method guard on SnapshotUpdate.validateWith: the snapshot-update implementation does not accept a custom SnapshotAncestryValidator for pre-commit validation. The message names the runtime class; passing a different validator cannot fix it — the capability is simply absent.

Solutions

1. Rely on the operation's built-in conflict validation instead of a custom ancestry validator
2. Catch UnsupportedOperationException and skip custom validation
3. Override validateWith in the operation implementation

When it happens

Trigger: Thrown at api/src/main/java/org/apache/iceberg/SnapshotUpdate.java:93 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/iceberg@86d9c8fc54 (2026-09-12). Data as JSON: /api/errors/9909fd1f1c42bc1e. Report an issue: GitHub.

Appendix: source

Thrown at api/src/main/java/org/apache/iceberg/SnapshotUpdate.java:93

    throw new UnsupportedOperationException(
        this.getClass().getName() + " does not support writeManifestsWith");
  }

  /**
   * Perform operations on a particular branch
   *
   * @param branch which is name of SnapshotRef of type branch.
   * @return this for method chaining
   */
  default ThisT toBranch(String branch) {
    throw new UnsupportedOperationException(
        String.format(
            "Cannot commit to branch %s: %s does not support branch commits",
            branch, this.getClass().getName()));
  }

  default ThisT validateWith(SnapshotAncestryValidator validator) {
    throw new UnsupportedOperationException(
        "Snapshot validation not supported by " + this.getClass().getName());
  }
}

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