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我有一个 CAS 消费者 AE，预计它会遍历管道中的 CAS 对象，序列化它们并将序列化的 CAS 添加到 xml 文件中。公共类 DataWriter 扩展 JCasConsumer_ImplBase {

private File outputDirectory;

public static final String PARAM_OUTPUT_DIRECTORY = "outputDir";
@ConfigurationParameter(name=PARAM_OUTPUT_DIRECTORY, defaultValue=".")
private String outputDir;

CasToInlineXml cas2xml;

public void initialize(UimaContext context) throws ResourceInitializationException {
    super.initialize(context);
    ConfigurationParameterInitializer.initialize(this, context);

    outputDirectory = new File(outputDir);
    if (!outputDirectory.exists()) {
        outputDirectory.mkdirs();
    }
}

@Override
public void process(JCas jCas) throws AnalysisEngineProcessException {
    String file = fileCollectionReader.fileName;
    File outFile = new File(outputDirectory, file + ".xmi");
    FileOutputStream out = null;



    try {
        out = new FileOutputStream(outFile);
        String xmlAnnotations = cas2xml.generateXML(jCas.getCas());
        out.write(xmlAnnotations.getBytes("UTF-8"));
       /* XmiCasSerializer ser = new XmiCasSerializer(jCas.getCas().getTypeSystem());
        XMLSerializer xmlSer = new XMLSerializer(out, false);
        ser.serialize(jCas.getCas(), xmlSer.getContentHandler());*/

        if (out != null) {
            out.close();
        }
    }
    catch (IOException e) {
        throw new AnalysisEngineProcessException(e);
    }
    catch (CASException e) {
        throw new AnalysisEngineProcessException(e);
    }
}

在我的所有注释器之后，我在管道中使用它，但它无法读取 CAS 对象（我在 jCas.getCas() 处收到 NullPointerException）。看起来我似乎不了解 CAS 消费者的正确用法。我很感激任何建议。

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