apache/maven · error · IllegalArgumentException

Invalid threads value: '${threadConfiguration}'. Supported a

Error message

Invalid threads value: '${threadConfiguration}'. Supported are int and float values ending with C.

What it means

Error "Invalid threads value: '${threadConfiguration}'. Supported are int and float values ending with C." thrown in apache/maven.

Source

Thrown at impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/LookupInvoker.java:950

                if (coreMultiplier <= 0.0f) {
                    throw new IllegalArgumentException("Invalid threads core multiplier value: '" + threadConfiguration
                            + "'. Value must be positive.");
                }

                int procs = Runtime.getRuntime().availableProcessors();
                int threads = (int) (coreMultiplier * procs);
                return threads == 0 ? 1 : threads;
            } else {
                int threads = Integer.parseInt(threadConfiguration);
                if (threads <= 0) {
                    throw new IllegalArgumentException(
                            "Invalid threads value: '" + threadConfiguration + "'. Value must be positive.");
                }
                return threads;
            }
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException("Invalid threads value: '" + threadConfiguration
                    + "'. Supported are int and float values ending with C.");
        }
    }

    protected abstract int execute(C context) throws Exception;
}

View on GitHub (pinned to e4093d4e12)

When it happens

Trigger: Thrown at impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/LookupInvoker.java:950 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/maven@e4093d4e12 (2026-08-21). Data as JSON: /api/errors/234de583ab6f74cf. Report an issue: GitHub.