ch-commons-util/src/main/java/com/cloudhopper/commons/util/DigitLookupMap.java [217:226]:
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    static protected void assertValidKey(String key) throws NullPointerException, IllegalArgumentException {
        // null keys are not permitted
        if (key == null) {
            throw new NullPointerException("A null key is not permitted");
        }
        // the address must be at least 1 char long
        if (key.length() <= 0) {
            throw new IllegalArgumentException("Illegal key [" + key + "]: must be a minimum length of 1");
        }
    }
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ch-commons-util/src/main/java/com/cloudhopper/commons/util/StringLookupMap.java [53:62]:
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    static protected void assertValidKey(String key) throws NullPointerException, IllegalArgumentException {
        // null keys are not permitted
        if (key == null) {
            throw new NullPointerException("A null key is not permitted");
        }
        // the address must be at least 1 char long
        if (key.length() <= 0) {
            throw new IllegalArgumentException("Illegal key [" + key + "]: must be a minimum length of 1");
        }
    }
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