theonedev/onedev · error · IllegalArgumentException

Invalid number in diff_fromDelta: ${param}

Error message

Invalid number in diff_fromDelta: ${param}

What it means

diff_fromDelta parses the numeric length prefix of '-'/'=' tokens with Integer.parseInt; a non-numeric prefix raises this IllegalArgumentException naming the token parameter, meaning the delta string is malformed.

Source

Thrown at server-core/src/main/java/io/onedev/server/util/diff/DiffMatchPatch.java:1538

						param = URLDecoder.decode(param, "UTF-8");
					} catch (UnsupportedEncodingException e) {
						// Not likely on modern system.
						throw new Error("This system does not support UTF-8.", e);
					} catch (IllegalArgumentException e) {
						// Malformed URI sequence.
						throw new IllegalArgumentException("Illegal escape in diff_fromDelta: "
								+ param, e);
					}
					diffs.add(new Diff(Operation.INSERT, param));
					break;
				case '-':
					// Fall through.
				case '=':
					int n;
					try {
						n = Integer.parseInt(param);
					} catch (NumberFormatException e) {
						throw new IllegalArgumentException("Invalid number in diff_fromDelta: "
								+ param, e);
					}
					if (n < 0) {
						throw new IllegalArgumentException("Negative number in diff_fromDelta: "
								+ param);
					}
					String text;
					try {
						text = text1.substring(pointer, pointer += n);
					} catch (StringIndexOutOfBoundsException e) {
						throw new IllegalArgumentException("Delta length (" + pointer
								+ ") larger than source text length (" + text1.length() + ").", e);
					}
					if (token.charAt(0) == '=') {
						diffs.add(new Diff(Operation.EQUAL, text));
					} else {
						diffs.add(new Diff(Operation.DELETE, text));
					}

View on GitHub (pinned to d44925c47c)

Solutions

1. Regenerate the delta with diff_toDelta.
2. Validate the delta token format (operation char + integer) before parsing.

When it happens

Trigger: Thrown at server-core/src/main/java/io/onedev/server/util/diff/DiffMatchPatch.java:1538 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of theonedev/onedev@d44925c47c (2026-09-06). Data as JSON: /api/errors/a1e4acd1c2ab4219. Report an issue: GitHub.