前端之家

  1. 首页
  2. 问答

Maven Apache OpenNLP工具获取NullPointerException

• 问答

我正在尝试将Apache OpenNLP与Maven结合使用。我在pom中添加了依赖项

<groupId>org.example</groupId>
<artifactId>nlp-fun</artifactId>
<version>1.0-snAPSHOT</version>

<properties>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.source>1.8</maven.compiler.source>
</properties>

<dependencies>
    <!-- https://mvnrepository.com/artifact/org.apache.opennlp/opennlp-tools -->
    <dependency>
        <groupId>org.apache.opennlp</groupId>
        <artifactId>opennlp-tools</artifactId>
        <version>1.9.2</version>
    </dependency>

</dependencies>

当我运行以下代码来创建LanguageDetectorModel对象时

public class Program {

public void fun() throws Exception{
    InputStream targetStream = new FileInputStream(new File("C:\\Users\\aaa\\Desktop\\nlp-fun\\src\\main\\input.txt"));
    LanguageDetectorModel m = new LanguageDetectorModel(targetStream);
    LanguageDetector myCategorizer = new LanguageDetectorME(m);
}

public static void main(String[] args) throws Exception{
    Program program = new Program();
    program.fun();
}

}

我收到以下NullPointerException，但我不确定该怎么办。我还尝试过将opennlp-tools添加为外部jar，但这也行不通

Exception in thread "main" java.lang.NullPointerException
at opennlp.tools.util.model.BaseModel.getManifestProperty(BaseModel.java:506)
at opennlp.tools.util.model.BaseModel.initializeFactory(BaseModel.java:248)
at opennlp.tools.util.model.BaseModel.loadmodel(BaseModel.java:234)
at opennlp.tools.util.model.BaseModel.<init>(BaseModel.java:176)
at opennlp.tools.langdetect.LanguageDetectorModel.<init>(LanguageDetectorModel.java:50)
at Program.fun(Program.java:18)
at Program.main(Program.java:24)
iCMS 回答：Maven Apache OpenNLP工具获取NullPointerException

targetStream应该是语言检测模型。您可以从OpenNLP website下载模型文件（langdetect-183.bin）。接下来，您可以使用模型来确定文本的语言。有关example的信息，请参见《 OpenNLP用户手册》，在下面也进行了复制：

InputStream is = new FileInputStream(new File("c:\path\to\langdetect-183.bin"));
LanguageDetectorModel m = new LanguageDetectorModel(is);

String inputText = "What language is this text?"
LanguageDetector myCategorizer = new LanguageDetectorME(m);

// Get the most probable language
Language bestLanguage = myCategorizer.predictLanguage(inputText);
System.out.println("Best language: " + bestLanguage.getLang());
System.out.println("Best language confidence: " + bestLanguage.getConfidence());

// Get an array with the most probable languages
Language[] languages = myCategorizer.predictLanguages(null);
javamavennullpointerexceptionopennlp
本文链接：https://www.f2er.com/2072171.html

大家都在问