protected static final char CACHE_KEY_SPLITTER = '\n';

    /** Cache for storing popular word lists */
    protected Cache<String, List<String>> cache;

    /** Fess configuration instance */
    protected FessConfig fessConfig;

    /**
     * Default constructor.
     */
    public PopularWordHelper() {
        // Default constructor
    }

    /**

     */
    public void setPageNumberList(final List<Integer> pageNumberList) {
        this.pageNumberList = pageNumberList;
    }

    /**
     * Gets the default page size from the Fess configuration.
     *
     * @return the default page size configured in the system
     */
    protected int getDefaultPageSize() {
        return ComponentUtil.getFessConfig().getPagingPageSizeAsInteger();
    }

     */
    public void setPageNumberList(final List<Integer> pageNumberList) {
        this.pageNumberList = pageNumberList;
    }

    /**
     * Gets the default page size from the Fess configuration.
     *
     * @return the default page size
     */
    protected int getDefaultPageSize() {
        return ComponentUtil.getFessConfig().getPagingPageSizeAsInteger();
    }

import static org.junit.jupiter.api.Assertions.assertTrue;

import java.util.Properties;

import org.junit.jupiter.api.Test;

import jcifs.CIFSException;

/**
 * Unit tests for Multi-Channel configuration properties
 */
class MultiChannelConfigurationTest {

    @Test
    void testDefaultMultiChannelSettings() throws CIFSException {
        PropertyConfiguration config = new PropertyConfiguration(new Properties());

		}
		if transport == nil {
			// Client certs are not readable return default transport.
			return s.NewHTTPTransportWithTimeout(1 * time.Minute)
		}
		return transport
	}

	return globalRemoteTargetTransport
}

// NewHTTPTransport returns a new http configuration
// used while communicating with the cloud backends.

        assertEquals(1, stats.totalCalls);
        assertEquals(1, stats.totalFailures);
    }

    @Test
    @DisplayName("Test invalid configuration")
    void testInvalidConfiguration() {
        assertThrows(IllegalArgumentException.class, () -> new SimpleCircuitBreaker("invalid", 0, 2, 100));

            Thread.currentThread().interrupt();
        }
    }
    
    // Proceed with normal error handling/retry
    super.handleConnectionLoss(error);
}
```

## 6. Configuration

### 6.1 Configuration Properties
```java
// In PropertyConfiguration.java
public static final String USE_WITNESS = "jcifs.smb.client.useWitness";

        verify(transport).getDfsReferrals(eq(ctx), isNull(), eq("h"), eq("d"), eq(1));
    }

    // Signing modes: optional vs enforced
    @Test
    @DisplayName("isSigningOptional and isSigningEnforced reflect configuration")
    void signingModes() throws Exception {
        when(transport.isSigningOptional()).thenReturn(true);
        when(transport.isSigningEnforced()).thenReturn(false);

        } else if (isSuccessful(responseData)) {
            if (transformer == null) {
                if (logger.isDebugEnabled()) {
                    logger.debug("No Transformer for ({}). PLEASE CHECK YOUR CONFIGURATION.", responseData.getUrl());
                }
            } else {
                final ResultData resultData = transformer.transform(responseData);
                if (resultData == null) {

                logger.warn("Failed to stop thumbnail generator.", e);
            }
        });
    }

    /**
     * Gets the system property option string for thumbnail path configuration.
     *
     * @return the property option string for JVM arguments
     */
    public String getThumbnailPathOption() {
        return "-D" + Constants.FESS_THUMBNAIL_PATH + "=" + baseDir.getAbsolutePath();