ikanalyzer和lucene整合关于扩展词典?报错

ik版本是3.2.0stable.jar    lucene版本是3.0.2.jar

----------------IKAnalyzer.cfg.xml的配置内容----------------------------

<properties>  
    <entry key="ext_dict">/ext_first.dic</entry>  
</properties>

------------------测试代码-------------------------------------------------

public static void main(String[] args) throws IOException {
    new TestAnalyzer().test(new IKAnalyzer(), "我是个大帅哥，而且很聪明的大帅哥");
}

public void test(Analyzer analyzer,String text) throws IOException{
        System.out.println("分词器是:"+analyzer.getClass().getName());
        TokenStream tokenStream=analyzer.tokenStream("content", new StringReader(text));
        tokenStream.addAttribute(TermAttribute.class);
        while(tokenStream.incrementToken()){
            TermAttribute termAttribute=tokenStream.getAttribute(TermAttribute.class);
            System.out.println(termAttribute.term());
        }
}

但是结果报错了：报错信息如下。麻烦大家给点建议：

        分词器是:org.wltea.analyzer.lucene.IKAnalyzer
        Exception in thread "main" java.lang.ExceptionInInitializerError
        at org.wltea.analyzer.seg.ChineseSegmenter.<init>(ChineseSegmenter.java:37)
        at org.wltea.analyzer.cfg.Configuration.loadSegmenter(Configuration.java:114)
        at org.wltea.analyzer.IKSegmentation.<init>(IKSegmentation.java:54)
        at org.wltea.analyzer.lucene.IKTokenizer.<init>(IKTokenizer.java:44)
        at org.wltea.analyzer.lucene.IKAnalyzer.tokenStream(IKAnalyzer.java:45)
        at cn.gdpe.lucene.TestAnalyzer.test(TestAnalyzer.java:32)
        at cn.gdpe.lucene.TestAnalyzer.main(TestAnalyzer.java:27)
        Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
        at org.wltea.analyzer.dic.DictSegment.fillSegment(DictSegment.java:139)
        at org.wltea.analyzer.dic.DictSegment.fillSegment(DictSegment.java:128)
        at org.wltea.analyzer.dic.Dictionary.loadMainDict(Dictionary.java:134)
        at org.wltea.analyzer.dic.Dictionary.<init>(Dictionary.java:71)
        at org.wltea.analyzer.dic.Dictionary.<clinit>(Dictionary.java:41)
        ... 7 more