pinpoint-apm/pinpoint · warning · IllegalArgumentException

Unexpected argument:

Error message

Unexpected argument: 

What it means

TypeUtils.getWrapperOf maps a primitive Class (int.class, void.class, ...) to its wrapper class. If passed a Class that is neither primitive nor any recognized primitive type, there is no wrapper and IllegalArgumentException is thrown.

Solutions

1. Only call getWrapperOf when clazz.isPrimitive() is true
2. Add an isPrimitive() guard or use a switch on the primitive type before mapping
3. Handle non-primitive classes separately (they need no wrapper)

Example fix

// before
Class<?> wrapper = TypeUtils.getWrapperOf(String.class); // throws
// after
Class<?> wrapper = clazz.isPrimitive() ? TypeUtils.getWrapperOf(clazz) : clazz;

if (!primitive.isPrimitive()) { throw new IllegalArgumentException("expected primitive: " + primitive); }

boolean isSupportedPrimitive(Class<?> c) { return c.isPrimitive() && c != void.class; }

try { wrapper = TypeUtils.getWrapperOf(c); } catch (IllegalArgumentException e) { wrapper = c; }

When it happens

Trigger: Calling TypeUtils.getWrapperOf(clazz) with a non-primitive Class (e.g. String.class) or an unrecognized primitive; the if/else chain covers all nine primitives, so anything else throws.

Common situations: Passing boxed classes or arbitrary parameter classes to getWrapperOf instead of checking Class.isPrimitive() first; generic signature-processing code that assumes primitives.

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

• method not found.
• args size not equal
• boot method invoke failed. Error:
• bootstrapClassLoader access fail Caused by:
• bootstrapClassLoader not found Caused by:

AI-assisted analysis of pinpoint-apm/pinpoint@744c3d3075 (2026-09-07). Data as JSON: /api/errors/56d48ff9e05e27c7. Report an issue: GitHub.

Appendix: source

Thrown at agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/util/TypeUtils.java:48

        } else if (primitive == byte.class) {
            return Byte.class;
        } else if (primitive == char.class) {
            return Character.class;
        } else if (primitive == short.class) {
            return Short.class;
        } else if (primitive == int.class) {
            return Integer.class;
        } else if (primitive == long.class) {
            return Long.class;
        } else if (primitive == float.class) {
            return Float.class;
        } else if (primitive == double.class) {
            return Double.class;
        } else if (primitive == void.class) {
            return Void.class;
        }
        
        throw new IllegalArgumentException("Unexpected argument: " + primitive);
    }
    
    public static String[] toClassNames(Class<?>... classes) {
        final int length = classes.length;
        final String[] result = new String[length];
        for (int i = 0; i < length; i++) {
            result[i] = classes[i].getName();
        }
        
        return result;
    }
        
    public static <T extends Annotation> T findAnnotation(Annotation[] annotations, Class<T> type) {
        for (Annotation a : annotations) {
            if (a.annotationType() == type) {
                return type.cast(a);
            }
        }

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