assertEquals("en", languageHelper.getSupportedLanguage("en"));
        assertEquals("zh", languageHelper.getSupportedLanguage("zh"));
        assertEquals("ko", languageHelper.getSupportedLanguage("ko"));
    }

    @Test
    public void test_getSupportedLanguage_unsupported() {
        assertNull(languageHelper.getSupportedLanguage("fr"));

		</postConstruct>
		<postConstruct name="addConfigFile">
			<arg>"fess"</arg>
			<arg>"ja/mapping.txt"</arg>
		</postConstruct>
		<postConstruct name="addConfigFile">
			<arg>"fess"</arg>
			<arg>"ko/nori.txt"</arg>
		</postConstruct>
		<postConstruct name="addConfigFile">
			<arg>"fess"</arg>
			<arg>"lt/protwords.txt"</arg>
		</postConstruct>
		<postConstruct name="addConfigFile">
			<arg>"fess"</arg>

          "type":       "stop",
          "stopwords_path": "${fess.dictionary.path}ja/stopwords.txt"
        },
        "korean_stop": {
          "type":       "stop",
          "stopwords_path": "${fess.dictionary.path}ko/stopwords.txt"
        },
        "latvian_stop": {
          "type":       "stop",
          "stopwords_path": "${fess.dictionary.path}lv/stopwords.txt"
        },
        "latvian_keywords": {

Find the `supported.languages` property (around line 202) and ensure your language code is included:

```properties
supported.languages=ar,bg,bn,ca,ckb_IQ,cs,da,de,el,en_IE,en,es,et,eu,fa,fi,fr,gl,gu,he,hi,hr,hu,hy,id,it,ja,ko,lt,lv,mk,ml,nl,no,pa,pl,pt_BR,pt,ro,ru,si,sq,sv,ta,te,th,tl,tr,uk,ur,vi,zh_CN,zh_TW,zh
```

**Optional configurations:**

If you create online help documentation:
```properties