pxb1988/dex2jar · error · RuntimeException

can't pase string

Error message

can't pase string

What it means

Jasmin grammar's string-escape parser handles octal escapes like \NNN by counting following octal digits (x). If an escape sequence has zero valid octal digits (a lone backslash or \ followed by a non-octal char), it throws RuntimeException("can't pase string") — a typo of 'parse'.

Solutions

1. Escape backslashes as \\ and use valid octal escapes (\0-\377) in the string
2. Replace bad escapes with the intended character or Unicode \uXXXX as supported
3. Fix the generator producing the .j file to emit valid escapes

Example fix

// before
ldc "C:\temp\x"
// after
ldc "C:\\temp\\x"

static String validateEscapes(String s) {
    for (int i = 0; i < s.length(); i++)
        if (s.charAt(i) == '\\' && (i + 1 >= s.length() || !isOctal(s.charAt(i + 1)))) throw new IllegalArgumentException("bad escape at " + i);
    return s;
}
static boolean isOctal(char c) { return c >= '0' && c <= '7'; }

When it happens

Trigger: A .j jasmin source file contains a malformed escape inside a string literal, e.g. .limit or ldc with "abc\q" or a trailing backslash.

Common situations: Hand-written or generated jasmin files with typos in escapes; tools exporting strings with backslashes not escaped; Windows-style paths pasted into string literals.

Related errors

• Fail to assemble
• not support access flags " + name
• can't get owner and type from '"+str+"'
• RecognitionException on invalid annotation element keyword…
• RecognitionException on invalid annotation element keyword…

AI-assisted analysis of pxb1988/dex2jar@b5bda4fb49 (2026-09-08). Data as JSON: /api/errors/65e69d33d35fa270. Report an issue: GitHub.

Appendix: source

Thrown at d2j-jasmin/src/main/antlr3/com/googlecode/d2j/jasmin/Jasmin.g:217

                    i += 2;
                    break;
                case 'u':
                    String sub = str.substring(i + 2, i + 6);
                    sb.append((char) Integer.parseInt(sub, 16));
                    i += 6;
                    break;
                default:
                    int x = 0;
                    while (x < 3) {
                        char e = str.charAt(i + 1 + x);
                        if (e >= '0' && e <= '7') {
                            x++;
                        } else {
                            break;
                        }
                    }
                    if (x == 0) {
                        throw new RuntimeException("can't pase string");
                    }
                    sb.append((char) Integer.parseInt(str.substring(i + 1, i + 1 + x), 8));
                    i += 1 + x;
                }

            } else {
                sb.append(c);
                i++;
            }
        }
        return sb.toString();
    }

    private static int getAcc(String name) {
        if (name.equals("public")) {
            return ACC_PUBLIC;
        } else if (name.equals("private")) {
            return ACC_PRIVATE;

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