pentaho/pentaho-kettle · error · AuthenticationFactoryException

DefaultAuthenticationConsumerFactory.Constructor.Arg

DefaultAuthenticationConsumerFactory.Constructor.Arg

Error message

DefaultAuthenticationConsumerFactory.Constructor.Arg

What it means

After picking the single public constructor, DefaultAuthenticationConsumerFactory requires it to take exactly one parameter; a zero-arg or multi-arg constructor triggers AuthenticationFactoryException with key 'DefaultAuthenticationConsumerFactory.Constructor.Arg'. The framework creates consumers by passing one argument (the authentication provider).

Solutions

1. Change the consumer to a single-argument public constructor accepting the provider/consumed dependency.
2. Bundle extra dependencies into one parameter object, or inject them another way before consume() runs.
3. Use a custom AuthenticationConsumerFactory instead of the default if the constructor contract cannot be met.

Example fix

// before
public MyConsumer(AuthenticationProvider p, Log log) {}
// after
public MyConsumer(AuthenticationProvider p) { this.log = Log.getInstance(); }

Constructor<?> c = MyConsumer.class.getConstructors()[0];
if (c.getParameterTypes().length != 1) {
  throw new IllegalStateException("Consumer constructor must take exactly one argument");
}

try { new DefaultAuthenticationConsumerFactory(MyConsumer.class); } catch (AuthenticationFactoryException e) { logError("Consumer must take one constructor arg", e); }

When it happens

Trigger: Registering a consumer class whose single public constructor has parameterTypes.length != 1 (e.g. a no-arg constructor or one taking two dependencies).

Common situations: DI-style consumers with several injected dependencies; default constructors on consumers written for standalone use; Lombok @AllArgsConstructor over multiple fields.

Understand the failure class

• Authentication and authorization failures — expired tokens, bad credentials, and missing scopes.

Related errors

• DefaultAuthenticationConsumerFactory.Constructor
• Can't create object
• Constructor not found for
• DefaultAuthenticationConsumerFactory.Consume
• Unable to get the constructor for

AI-assisted analysis of pentaho/pentaho-kettle@f3058517a1 (2026-09-13). Data as JSON: /api/errors/e7bc49bbe6e37116. Report an issue: GitHub.

Appendix: source

Thrown at engine/src/main/java/org/pentaho/di/core/auth/core/impl/DefaultAuthenticationConsumerFactory.java:44

  private static final Class<?> PKG = DefaultAuthenticationConsumerFactory.class;
  private final Constructor<?> constructor;
  private final Class<Object> consumedType;
  private final Class<Object> returnType;
  private final Class<Object> createArgType;

  @SuppressWarnings( "unchecked" )
  public DefaultAuthenticationConsumerFactory( Class<?> consumerClass ) throws AuthenticationFactoryException {
    Constructor<?>[] constructors = consumerClass.getConstructors();
    if ( constructors.length != 1 ) {
      throw new AuthenticationFactoryException( BaseMessages.getString( PKG,
          "DefaultAuthenticationConsumerFactory.Constructor", getClass().getName(),
          consumerClass.getCanonicalName() ) );
    }

    constructor = constructors[0];
    Class<?>[] parameterTypes = constructor.getParameterTypes();
    if ( parameterTypes.length != 1 ) {
      throw new AuthenticationFactoryException( BaseMessages.getString( PKG,
          "DefaultAuthenticationConsumerFactory.Constructor.Arg", getClass().getName(), consumerClass
              .getCanonicalName() ) );
    }

    Method consumeMethod = null;
    Class<?> consumedType = Object.class;
    for ( Method method : consumerClass.getMethods() ) {
      if ( "consume".equals( method.getName() ) ) {
        Class<?>[] methodParameterTypes = method.getParameterTypes();
        if ( methodParameterTypes.length == 1 && consumedType.isAssignableFrom( methodParameterTypes[0] ) ) {
          consumeMethod = method;
          consumedType = methodParameterTypes[0];
        }
      }
    }

    if ( consumeMethod == null ) {
      throw new AuthenticationFactoryException( BaseMessages.getString( PKG,

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