apache/skywalking · error · IllegalArgumentException

Cannot resolve field/getter {simpleName}.{fieldName} in def

Error message

Cannot resolve field/getter {simpleName}.{fieldName} in def variable chain

What it means

Thrown by TimeBucket.retainToDayLastMin4MinuteBucket(long) when the argument fails isMinuteBucket — not a 12-digit yyyyMMddHHmm value. This variant pins HHmm to 2359 (last minute of the day) for end-of-day rollups; like its sibling it accepts minute buckets only.

Source

Thrown at oap-server/analyzer/log-analyzer/src/main/java/org/apache/skywalking/oap/log/analyzer/v2/compiler/LALDefCodegen.java:311

                    canBeNull = !returnType.isPrimitive();
                }
            } else if (seg instanceof LALScriptModel.FieldSegment) {
                final LALScriptModel.FieldSegment fs =
                    (LALScriptModel.FieldSegment) seg;
                final String fieldName = fs.getName();
                // Try getter first
                final String getterName = "get"
                    + Character.toUpperCase(fieldName.charAt(0))
                    + fieldName.substring(1);
                Method getter = null;
                try {
                    getter = currentType.getMethod(getterName);
                } catch (NoSuchMethodException e) {
                    // Try direct field access name
                    try {
                        getter = currentType.getMethod(fieldName);
                    } catch (NoSuchMethodException e2) {
                        throw new IllegalArgumentException(
                            "Cannot resolve field/getter "
                                + currentType.getSimpleName()
                                + "." + fieldName + " in def variable chain");
                    }
                }
                final Class<?> returnType = getter.getReturnType();

                if (fs.isSafeNav() && canBeNull) {
                    if (isLast && returnType.isPrimitive()) {
                        final String boxName =
                            LALCodegenHelper.boxTypeName(returnType);
                        prevExpr = "(" + prevExpr + " == null ? null : "
                            + boxName + ".valueOf(" + prevExpr + "."
                            + getter.getName() + "()))";
                        currentType = returnType;
                    } else {
                        prevExpr = "(" + prevExpr + " == null ? null : "
                            + prevExpr + "." + getter.getName() + "())";

View on GitHub (pinned to 102af09b4a)

Solutions

1. Pre-validate with TimeBucket.isMinuteBucket and reject/convert non-minute inputs before the call
2. Regenerate the correct precision with TimeBucket.getTimeBucket(timestamp, DownSampling.Minute) when starting from a raw timestamp
3. Check the upstream producer of the bucket (storage column, metric stream) for precision mismatches

Example fix

// before
long endOfDay = TimeBucket.retainToDayLastMin4MinuteBucket(bucket); // throws if not minute
// after
long endOfDay = TimeBucket.isMinuteBucket(bucket)
    ? TimeBucket.retainToDayLastMin4MinuteBucket(bucket)
    : TimeBucket.retainToDayLastMin4MinuteBucket(
          TimeBucket.getTimeBucket(System.currentTimeMillis(), DownSampling.Minute));

if (TimeBucket.isMinuteBucket(minuteTimeBucket)) { long lastMin = TimeBucket.retainToDayLastMin4MinuteBucket(minuteTimeBucket); }

When it happens

Trigger: Calling retainToDayLastMin4MinuteBucket with a day/second bucket or an epoch timestamp instead of a minute bucket; commonly hit in TTL or aggregation code that switched bucket precision between versions.

Common situations: Rollup/TTL pipelines fed with hour-precision buckets after a refactor; test fixtures with plausible-looking but wrong-digit longs; data replays from systems that store buckets as epoch millis.

Related errors

• {funcName}() requires exactly 1 argument, got {argCount}
• Cannot resolve method {simpleName}.{methodName}() in def var
• Failed to load GenAI configuration file.
• Output type {outputTypeName} has no setter {setterName}() fo
• def cast type not found on classpath: {castType}

AI-assisted analysis of apache/skywalking@102af09b4a (2026-08-14). Data as JSON: /api/errors/2b3066a24f42bb27. Report an issue: GitHub.