apache/maven · error · LookupException

This is only a stub.

Error message

This is only a stub.

What it means

Error "This is only a stub." thrown in apache/maven.

Source

Thrown at impl/maven-testing/src/main/java/org/apache/maven/testing/plugin/stubs/LookupStub.java:45

/**
 * A stub implementation of {@link Lookup} for testing purposes.
 * Provides a simple service lookup mechanism for tests.
 *
 * @since 4.0.0
 */
public class LookupStub implements Lookup {

    public static final Lookup EMPTY = new LookupStub();

    /**
     * For sub-class constructors.
     */
    protected LookupStub() {}

    @Override
    public <T> T lookup(Class<T> type) {
        throw new LookupException("This is only a stub.");
    }

    @Override
    public <T> T lookup(Class<T> type, String string) {
        throw new LookupException("This is only a stub.");
    }

    @Override
    public <T> Optional<T> lookupOptional(Class<T> type) {
        return Optional.empty();
    }

    @Override
    public <T> Optional<T> lookupOptional(Class<T> type, String string) {
        return Optional.empty();
    }

    @Override

View on GitHub (pinned to e4093d4e12)

When it happens

Trigger: Thrown at impl/maven-testing/src/main/java/org/apache/maven/testing/plugin/stubs/LookupStub.java:45 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/0bf94a99941f38b7. Report an issue: GitHub.