jeecgboot/JeecgBoot · error · ParseException

Unexpected character '${c}' after '/'

Error message

Unexpected character '${c}' after '/'

What it means

Thrown after the parser has read the first digit following '/' and then encounters a character that is not a digit at the next position. For multi-digit step values this is normal (the parser reads all consecutive digits), but if the character after the first step digit is a letter, special character, or delimiter that is not 0–9, the expression is malformed. Note: if the very first character after '/' is not a digit, Integer.parseInt on the prior line would throw an unchecked NumberFormatException instead — this error specifically fires when the first char IS a digit but a subsequent char is not.

Source

Thrown at jeecg-boot/jeecg-server-cloud/jeecg-visual/jeecg-cloud-xxljob/src/main/java/com/xxl/job/admin/business/scheduler/cron/CronExpression.java:865

            i++;
            c = s.charAt(i);
            int v2 = Integer.parseInt(String.valueOf(c));
            i++;
            if (i >= s.length()) {
                checkIncrementRange(v2, type, i);
                addToSet(val, end, v2, type);
                return i;
            }
            c = s.charAt(i);
            if (c >= '0' && c <= '9') {
                ValueSet vs = getValue(v2, s, i);
                int v3 = vs.value;
                checkIncrementRange(v3, type, i);
                addToSet(val, end, v3, type);
                i = vs.pos;
                return i;
            } else {
                throw new ParseException("Unexpected character '" + c + "' after '/'", i);
            }
        }

        addToSet(val, end, 0, type);
        i++;
        return i;
    }

    public String getCronExpression() {
        return cronExpression;
    }

    public String getExpressionSummary() {
        StringBuilder buf = new StringBuilder();

        buf.append("seconds: ");
        buf.append(getExpressionSetSummary(seconds));
        buf.append("\n");

View on GitHub (pinned to 96fb33f5ec)

Solutions

1. Remove any non-numeric characters after the step value — the step must be a pure integer.
2. Separate concerns: use either step ('/') or modifier ('L', 'W', '#') in a single token, not both after the same base value.
3. Inspect the full field string character-by-character if built dynamically.

Example fix

// before
String cron = "0/5W * * * * ?";  // 'W' after step value
// after
String cron = "0/5 * * * * ?";  // every 5 seconds

// After '/', ensure only digits follow the step value until end or delimiter
for (String field : cronExpr.split("\\s+")) {
    int slashIdx = field.indexOf('/');
    if (slashIdx >= 0 && slashIdx + 1 < field.length()) {
        String afterSlash = field.substring(slashIdx + 1);
        for (char ch : afterSlash.toCharArray()) {
            if (ch < '0' || ch > '9') {
                throw new IllegalArgumentException("Unexpected character '" + ch + "' after '/'");
            }
        }
    }
}

boolean isStepValuePureDigits(String field) {
    int slashIdx = field.indexOf('/');
    if (slashIdx < 0 || slashIdx + 1 >= field.length()) return true;
    String step = field.substring(slashIdx + 1);
    return step.chars().allMatch(c -> c >= '0' && c <= '9');
}

try {
    CronExpression cron = new CronExpression(expr);
} catch (ParseException e) {
    if (e.getMessage().contains("Unexpected character") && e.getMessage().contains("after '/'")) {
        // remove non-digit characters after the step value
    }
    throw e;
}

When it happens

Trigger: A cron field token like '0/5L' (letter after step), '0/5/' (second slash), '0/5-' (dash after step), or '0/5#' where the parser reads '5' as v2 then sees a non-digit. The token must have a digit immediately after '/', followed by a non-digit that is not whitespace or end-of-string.

Common situations: Developer combines step syntax with a modifier incorrectly (e.g., '1/5W'); malformed expression from string concatenation; trailing junk character appended to a valid step value.

Related errors

• Day-of-Week values must be between 1 and 7
• 'L' option is not valid here. (pos=${i})
• 'W' option is not valid here. (pos=${i})
• The 'W' option does not make sense with values larger than 3
• '#' option is not valid here. (pos=${i})

AI-assisted analysis of jeecgboot/JeecgBoot@96fb33f5ec (2026-08-14). Data as JSON: /api/errors/253afedcf40ef2c7. Report an issue: GitHub.