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Minimal set of web3j utility classes

There is a newer version: 5.0.0

package org.web3j.utils;

/**
 * Assertion utility functions.
 */
public class Assertions {

    /**
     * Verify that the provided precondition holds true.
     *
     * @param assertionResult assertion value
     * @param errorMessage error message if precondition failure
     */
    public static void verifyPrecondition(boolean assertionResult, String errorMessage) {
        if (!assertionResult) {
            throw new RuntimeException(errorMessage);
        }
    }
}