"[SOLVED] Possible error in com.rapidminer.parameter.Parameters"

This is the code of com.rapidminer.parameter.Parameters.setParameter(String key, String value) as of Unuk rev 708:

/**
 * Sets the parameter for the given key after performing a range-check. This method returns true if the type was
 * known and false if no parameter type was defined for this key.
 */
public boolean setParameter(String key, String value) {
	boolean knownType = true;
	if (value == null) {
		keyToValueMap.remove(key);
	} else {
		ParameterType type = keyToTypeMap.get(key);
		if (type != null) {
			value = type.transformNewValue(value);
			knownType = true;
		}
		keyToValueMap.put(key, value);
	}
	fireUpdate(key);
	return knownType;
}

Now, note that the Javadoc states "This method returns [...] false if no parameter type was defined for this key."  But if you take a close look at the method's code, you'll see that it can *never* return false.

The fix is simple: the knownType initializer needs to be changed, and the Javadoc refined as follows:

/**
 * Sets the parameter for the given key after performing a range-check.
 * This method returns true if the type was known and false if no
 * parameter type was defined for this key (or if the parameter type
 * is no longer defined as a result of setting its value to null).
 */
public boolean setParameter(String key, String value) {
	boolean knownType = false;
...