} catch (Exception e) {
            fail("Should not throw exception with null AssistantDirector");
        }
    }

    public void test_multipleHookCalls_maintainsSameTimeZone() {
        // Given
        FwAssistantDirector assistantDirector = null;

        // When
        curtainBeforeHook.hook(assistantDirector);
        DfFinalTimeZoneProvider firstProvider = getDBFluteSystemTimeZoneProvider();

        FwAssistantDirector assistantDirector = createMockAssistantDirector();

        // First invocation
        curtainFinallyHook.hook(assistantDirector);

        // Second invocation - should also work without issues
        curtainFinallyHook.hook(assistantDirector);

        // Third invocation
        curtainFinallyHook.hook(assistantDirector);

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE components PUBLIC "-//DBFLUTE//DTD LastaDi 1.0//EN"
	"http://dbflute.org/meta/lastadi10.dtd">
<components>
	<component name="assistantDirector" class="org.codelibs.fess.mylasta.direction.FessFwAssistantDirector"/>
	<component name="fessConfig" class="org.codelibs.fess.mylasta.direction.FessConfigImpl"/>

/**
 * The hook before curtain.
 *
 * @author jflute
 */
public class FessCurtainBeforeHook implements CurtainBeforeHook {

    @Override
    public void hook(final FwAssistantDirector assistantDirector) {
        processDBFluteSystem();
    }

    protected void processDBFluteSystem() {
        DBFluteSystem.unlock();
        DBFluteSystem.setFinalTimeZoneProvider(createFinalTimeZoneProvider());

public class FessCurtainFinallyHook implements CurtainFinallyHook {

    private static final Logger logger = LogManager.getLogger(FessCurtainFinallyHook.class);

    @Override
    public void hook(final FwAssistantDirector assistantDirector) {
        shutdownCommonsHttpClient();
    }

    private void shutdownCommonsHttpClient() { // from Tomcat7ConfigServlet (old class)
        try {