定制Solr Stemming过滤器

Question

我正在尝试实现一个自定义的solr过滤器来阻止阿拉伯语单词，过滤器类如下，但我不断收到以下错误＆＃34;可能的分析错误＆＃34;索引文档时，我正在使用Khoja的词干分析器

public final class CustomArbicStemFilter extends TokenFilter {
private CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
private CustomArabicStemmer stemmer = null; 
public CustomArbicStemFilter(TokenStream input) {
super(input);
this.stemmer = new CustomArabicStemmer();
}
public final boolean incrementToken() throws IOException {
     if (input.incrementToken()) {      
         char termBuffer[] = termAtt.buffer();
         String currentWord = new String( termBuffer);
         String stemmedWord = stemmer.stemWord(currentWord);
         char finalTerm[] = stemmedWord.toCharArray();
         termAtt.copyBuffer(finalTerm, 0, finalTerm.length);      
         return true;
     }else{
         return false;
     }      

} }