theonedev/onedev · error · IllegalArgumentException

Delta length (${pointer}) larger than source text length (${

Error message

Delta length (${pointer}) larger than source text length (${text1.length()}).

What it means

After parsing the length n, diff_fromDelta takes text1.substring(pointer, pointer+n); a StringIndexOutOfBoundsException means the delta claims more characters than remain in the source text, so the delta does not match text1.

Source

Thrown at server-core/src/main/java/io/onedev/server/util/diff/DiffMatchPatch.java:1549

				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: "
							+ token.charAt(0));
			}
		}
		if (pointer != text1.length()) {
			throw new IllegalArgumentException("Delta length (" + pointer
					+ ") smaller than source text length (" + text1.length() + ").");
		}

View on GitHub (pinned to d44925c47c)

Solutions

1. Ensure the delta was generated from the same text1 being passed in.
2. Regenerate the delta pair instead of reusing a stale one.

When it happens

Trigger: Thrown at server-core/src/main/java/io/onedev/server/util/diff/DiffMatchPatch.java:1549 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/e818f394aea0067b. Report an issue: GitHub.