有同样的问题！我得到InputSteram = null，我使用了IntelliJ IDEA，OpenNLP 1.9.1。在Ubuntu 18.04上
public void makeDataTrainingModel() {
model = null;
System.out.println("POS model started");
//InputStream dataIn = null;
InputStreamFactory dataIn = null;
try {
dataIn = new InputStreamFactory() {
public InputStream createInputStream() throws IOException {
return NLPClassifier.class.getResourceAsStream("/home/int/src
/main/resources/en-pos.txt");
}
};
//I get null pointer here in dataIn
ObjectStream<String> lineStream = new PlainTextByLineStream((InputStreamFactory) , "UTF-8");
ObjectStream<POSSample> sampleStream = new WordTagSampleStream(lineStream);
**//This train part IS NOT WORK ?**
model = POSTaggerME.train("en", sampleStream, TrainingParameters.defaultParams(), null);
} catch (IOException e) {
// Failed to read or parse training data, training failed
e.printStackTrace();
} finally {
if (dataIn != null) {
System.out.println("InputStreamFactory was not created!");
}
}
System.out.println("POS model done...");
System.out.println("Success generate model...");
//write Data model
OutputStream modelOut = null;
try {
String currentDir = new File("").getAbsolutePath();
modelOut = new BufferedOutputStream(new FileOutputStream(currentDir + "//src//main//resources//example-bad-model.dat"));
model.serialize(modelOut);
} catch (IOException e) {
// Failed to save model
e.printStackTrace();
} finally {
if (modelOut != null) {
try {
modelOut.close();
} catch (IOException e) {
// Failed to correctly save model.
// Written model might be invalid.
e.printStackTrace();
}
}
}
System.out.println("Model generated and treated successfully...");
}
我在inputStream中得到了空指针，并且出错了...未创建InputStreamFactory！
Exception in thread "main" java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:113)
at
opennlp.tools.util.PlainTextByLineStream.reset(PlainTextByLineStream.java:57)
at opennlp.tools.util.PlainTextByLineStream.<init>
(PlainTextByLineStream.java:48)
at opennlp.tools.util.PlainTextByLineStream.<init>
(PlainTextByLineStream.java:39)
at NLPClassifier.makeDataTrainingModel(NLPClassifier.java:98)
at NlpProductClassifier.main(NlpProductClassifier.java:39)
如果getResourceAsStream返回null，则表示未找到资源。
您应该检查null并做其他事情，例如引发异常（IOException或FileNotFoundException在这种情况下，因为声明IOException允许子类throws），所以您不应该让它将传递null给其余代码。
NLPClassifier.class.getResourceAsStream("/home/int/src/main/resources/en-pos.txt")无法使用，因为资源与Java包具有相同的结构，只是用斜杠代替了点。它不是文件系统中的路径。
将其更改为：（getResourceAsStream("/en-pos.txt")因为您的文件位于包层次结构的根目录中）
本文收集自互联网，转载请注明来源。
如有侵权，请联系[email protected] 删除。
我来说两句