/** URL codec for encoding and decoding URL parameters */
    protected URLCodec urlCodec = new URLCodec();

    /**
     * Default constructor for EncodingFilter.
     */
    public EncodingFilter() {
        // Default constructor
    }

    /**
     * Initializes the filter with configuration parameters.
     * Sets up encoding mappings and default encoding from filter configuration.

import org.junit.jupiter.api.Test;

public class EncodingFilterTest extends UnitFessTestCase {
    @Test
    public void test_normal() throws IOException {
        final EncodingFilter filter = new EncodingFilter();
        Map<String, String[]> paramMap;

        paramMap = filter.parseQueryString("a=1", "UTF-8");
        assertEquals(1, paramMap.size());
        assertEquals("1", paramMap.get("a")[0]);

  <!--                                                                    ============== -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.codelibs.fess.filter.EncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>