theonedev/onedev · error · IllegalArgumentException

Negative number in diff_fromDelta: ${param}

Error message

Negative number in diff_fromDelta: ${param}

What it means

Delta-decoder guard in DiffMatchPatch.diff_fromDelta: a delta token prefixed with '-' or '=' parsed to a negative number; those operations require a non-negative length, so IllegalArgumentException is thrown for the malformed delta string. Fix: supply a well-formed delta encoding (non-negative numeric lengths).

Source

Thrown at server-core/src/main/java/io/onedev/server/util/diff/DiffMatchPatch.java:1542

					} 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));
					}
					break;
				default:
					// Anything else is an error.
					throw new IllegalArgumentException("Invalid diff operation in diff_fromDelta: "

View on GitHub (pinned to d44925c47c)

Solutions

1. Regenerate the delta with diff_toDelta.
2. Fix the negative length prefix in the corrupted token.

When it happens

Trigger: Thrown at server-core/src/main/java/io/onedev/server/util/diff/DiffMatchPatch.java:1542 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/11473a3392b2d09e. Report an issue: GitHub.