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The TwelveMonkeys Core library. Contains common utility classes.
There is a newer version: 2.3
package com.twelvemonkeys.lang;

import java.util.Arrays;
import java.util.Collection;
import java.util.Map;

/**
 * Kind of like {@code org.apache.commons.lang.Validate}. Just smarter. ;-)
 * 
 * Uses type parameterized return values, thus making it possible to check
 * constructor arguments before
 * they are passed on to {@code super} or {@code this} type constructors. 
 *
 * @author Harald Kuhr
 * @author last modified by $Author: haku $
 * @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/lang/Validate.java#1 $
 */
public final class Validate {
    private static final String UNSPECIFIED_PARAM_NAME = "method parameter";

    private Validate() {}

    // Not null...

    public static  T notNull(final T pParameter) {
        return notNull(pParameter, null);
    }

    public static  T notNull(final T pParameter, final String pParamName) {
        if (pParameter == null) {
            throw new IllegalArgumentException(String.format("%s may not be null", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
        }
        return pParameter;
    }

    // Not empty...

    public static  T notEmpty(final T pParameter) {
        return notEmpty(pParameter, null);
    }

    public static  T notEmpty(final T pParameter, final String pParamName) {
        if (pParameter == null || pParameter.length() == 0) {
            throw new IllegalArgumentException(String.format("%s may not be empty", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
        }

        return pParameter;
    }

    public static  T[] notEmpty(final T[] pParameter) {
        return notEmpty(pParameter, null);
    }

    public static  T[] notEmpty(final T[] pParameter, final String pParamName) {
        if (pParameter == null || pParameter.length == 0) {
            throw new IllegalArgumentException(String.format("%s may not be empty", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
        }

        return pParameter;
    }

    public static  Collection notEmpty(final Collection pParameter) {
        return notEmpty(pParameter, null);
    }

    public static  Collection notEmpty(final Collection pParameter, final String pParamName) {
        if (pParameter == null || pParameter.isEmpty()) {
            throw new IllegalArgumentException(String.format("%s may not be empty", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
        }

        return pParameter;
    }

    public static  Map notEmpty(final Map pParameter) {
        return notEmpty(pParameter, null);
    }

    public static  Map notEmpty(final Map pParameter, final String pParamName) {
        if (pParameter == null || pParameter.isEmpty()) {
            throw new IllegalArgumentException(String.format("%s may not be empty", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
        }

        return pParameter;
    }

    // No null elements

    public static  T[] noNullElements(final T[] pParameter) {
        return noNullElements(pParameter, null);
    }

    public static  T[] noNullElements(final T[] pParameter, final String pParamName) {
        noNullElements(Arrays.asList(pParameter), pParamName);
        return pParameter;
    }

    public static  Collection noNullElements(final Collection pParameter) {
        return noNullElements(pParameter, null);
    }

    public static  Collection noNullElements(final Collection pParameter, final String pParamName) {
        for (T element : pParameter) {
            if (element == null) {
                throw new IllegalArgumentException(String.format("%s may not contain null elements", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
            }
        }

        return pParameter;
    }

    public static  Map  noNullElements(final Map  pParameter) {
        return noNullElements(pParameter, null);
    }

    public static  Map  noNullElements(final Map  pParameter, final String pParamName) {
        for (V element : pParameter.values()) {
            if (element == null) {
                throw new IllegalArgumentException(String.format("%s may not contain null elements", pParamName == null ? UNSPECIFIED_PARAM_NAME : pParamName));
            }
        }

        return pParameter;
    }
}