}

    @Test
    public void test_serialVersionUID() {
        // Test that serialVersionUID is properly set
        CommandExecutionException exception1 = new CommandExecutionException("Test");
        CommandExecutionException exception2 = new CommandExecutionException("Test");

        // Both instances should be of the same class
        assertEquals(exception1.getClass(), exception2.getClass());

import org.codelibs.core.lang.ThreadUtil;
import org.codelibs.fess.crawler.Constants;
import org.codelibs.fess.crawler.exception.CrawlerSystemException;
import org.codelibs.fess.exception.CommandExecutionException;
import org.codelibs.fess.opensearch.user.exentity.User;

/**
 * Authentication chain implementation that executes external commands for user operations.