apache/flink · error · IndexOutOfBoundsException

{pos}

Error message

{pos}

What it means

Thrown by Tuple20.getField(int) when the position argument falls outside 0..19 — the switch over field positions reaches the default branch and reports the offending index via String.valueOf(pos). Tuple20 has exactly 20 fields (f0..f19); the caller addressed an out-of-range position.

Solutions

1. Address the cause reported by the error message: the reported value
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("the reported value") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: the reported value.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: the reported value.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/d71466f699433abf. Report an issue: GitHub.

Appendix: source

Thrown at flink-core-api/src/main/java/org/apache/flink/api/java/tuple/Tuple20.java:274

                return (T) this.f11;
            case 12:
                return (T) this.f12;
            case 13:
                return (T) this.f13;
            case 14:
                return (T) this.f14;
            case 15:
                return (T) this.f15;
            case 16:
                return (T) this.f16;
            case 17:
                return (T) this.f17;
            case 18:
                return (T) this.f18;
            case 19:
                return (T) this.f19;
            default:
                throw new IndexOutOfBoundsException(String.valueOf(pos));
        }
    }

    @Override
    @SuppressWarnings("unchecked")
    public <T> void setField(T value, int pos) {
        switch (pos) {
            case 0:
                this.f0 = (T0) value;
                break;
            case 1:
                this.f1 = (T1) value;
                break;
            case 2:
                this.f2 = (T2) value;
                break;
            case 3:
                this.f3 = (T3) value;

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