apache/hadoop · error · ResourceEstimatorException

Could not instantiate : {} due to exception: {}

Error message

Could not instantiate : {} due to exception: {}

What it means

Error "Could not instantiate : {} due to exception: {}" thrown in apache/hadoop.

Source

Thrown at hadoop-tools/hadoop-resourceestimator/src/main/java/org/apache/hadoop/resourceestimator/common/config/ResourceEstimatorUtil.java:73

    }
    try {
      Class<?> concreteClass = Class.forName(className);
      if (type.isAssignableFrom(concreteClass)) {
        Constructor<T> meth =
            (Constructor<T>) concreteClass.getDeclaredConstructor(EMPTY_ARRAY);
        meth.setAccessible(true);
        return meth.newInstance();
      } else {
        StringBuilder errMsg = new StringBuilder();
        errMsg.append("Class: ").append(className).append(" not instance of ")
            .append(type.getCanonicalName());
        throw new ResourceEstimatorException(errMsg.toString());
      }
    } catch (ClassNotFoundException e) {
      StringBuilder errMsg = new StringBuilder();
      errMsg.append("Could not instantiate : ").append(className)
          .append(" due to exception: ").append(e.getCause());
      throw new ResourceEstimatorException(errMsg.toString());
    } catch (ReflectiveOperationException e) {
      StringBuilder errMsg = new StringBuilder();
      errMsg.append("Could not instantiate : ").append(className)
          .append(" due to exception: ").append(e.getCause());
      throw new ResourceEstimatorException(errMsg.toString());
    }
  }
}

View on GitHub (pinned to 2add963021)

Solutions

1. Ensure the configured class has a public no-arg constructor and is on the classpath; see the logged exception for the instantiation failure.

When it happens

Trigger: The resource estimator fails to instantiate a configured class via reflection, e.g. because it has no accessible no-arg constructor or its constructor throws.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/70223ac396d624e3. Report an issue: GitHub.