alibaba/COLA · error · BizException

${errMessage}

Error message

${errMessage}

What it means

Thrown by the Assert.isTrue/isFalse validation helper in COLA's Assert utility when the checked boolean expression fails its expectation: isFalse throws BizException with this caller-supplied message when the expression is true, and isTrue (the site here) throws when the expression is false. It is a generic argument/state guard, not a domain error — the input at fault is the expression result, and errMessage is whatever text the caller passed to Assert, so the message content itself carries no fixed semantics.

Source

Thrown at cola-components/cola-component-exception/src/main/java/com/alibaba/cola/exception/Assert.java:63

    /**
     * Assert a boolean expression, if expression is true, throwing {@code BizException}
     *
     * for example
     *
     * <pre class="code">Assert.isFalse(i == 0, errorCode.B_ORDER_illegalNumber, "The order number can not be zero");</pre>
     *
     * This is more intuitive than isTure.
     */
    public static void isFalse(boolean expression, String errorCode, String errMessage) {
        if (expression) {
            throw new BizException(errorCode, errMessage);
        }
    }

    public static void isTrue(boolean expression, String errMessage) {
        if (!expression) {
            throw new BizException(errMessage);
        }
    }

    public static void isFalse(boolean expression, String errMessage) {
        if (expression) {
            throw new BizException(errMessage);
        }
    }

    public static void isTrue(boolean expression) {
        isTrue(expression, "[Assertion failed] Must be true");
    }

    public static void isFalse(boolean expression) {
        isFalse(expression, "[Assertion failed] Must be false");
    }

    public static void notNull(Object object, String errorCode, String errMessage) {

View on GitHub (pinned to 352e1a8675)

Solutions

1. Check the exception message to find which assertion failed.
2. Correct the input/state that made the expression false.
3. If a structured error code is needed, switch to the three-argument Assert.isTrue(expression, errorCode, errMessage).

Example fix

// before
Assert.isTrue(user != null, "User must exist"); // BizException without code
// after
Assert.isTrue(user != null, ErrorCode.B_USER_notFound.getErrCode(), "User must exist");

if (user == null) {
    return Response.buildFailure("USER_NOT_FOUND", "User must exist");
}
Assert.isTrue(user != null, "User must exist");

try {
    Assert.isTrue(expr, errMessage);
} catch (BizException e) {
    log.warn("Assertion failed: {}", e.getMessage());
    return Response.buildFailure("ASSERTION_FAILED", e.getMessage());
}

When it happens

Trigger: Calling Assert.isTrue(expr, "message") where expr is false — e.g. validating a precondition without a formal ErrorCode.

Common situations: Quick inline validations in services or tests; developers omitting an ErrorCode and later needing to distinguish these BizExceptions by message only.

Understand the failure class

Background: "Must be a positive integer", "Invalid value", "Unsupported": the invalid-argument-value error family, when a library rejects the value you pass — this error's family across 35 libraries.

Related errors

• ${errorCode}
• B_CUSTOMER_companyNameConflict
• ${companyName} has already existed, you can not add it
• B_CUSTOMER_companyNameConflict
• ${companyName} has already existed, you can not add it

AI-assisted analysis of alibaba/COLA@352e1a8675 (2026-09-08). Data as JSON: /api/errors/c6f45c9dd40bb686. Report an issue: GitHub.