try {
            Path path = ResourceUtil.getConfOrClassesPath("nonexistent.conf");
            fail("Should throw ResourceNotFoundRuntimeException for non-existent file");
        } catch (org.codelibs.core.exception.ResourceNotFoundRuntimeException e) {
            // Expected behavior - method throws exception for non-existent files
            assertTrue(e.getMessage().contains("nonexistent.conf"));

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;

import org.codelibs.core.exception.IORuntimeException;
import org.codelibs.core.exception.ResourceNotFoundRuntimeException;
import org.codelibs.core.jar.JarFileUtil;
import org.codelibs.core.net.URLUtil;

/**
 * Utility class for resource handling.
 *
 * @author higa
 */
public abstract class ResourceUtil {