我无法在Spring的后台运行该方法

Question

我有一个服务DocumentServiceImpl。

在这里面我想运行一个方法index()的class GlobalSearch背景。

@Service

@RequiredArgsConstructor

 public class DocumentServiceImpl implements DocumentService { 

... any code

@Transactional

 public void save(){

...

  Thread indexTread = new Thread(new GlobalSearch(file, id), "GlobalSearch");

  indexTread.start();

....

 }

}

方法index使用类GlobalSearch的从类ExtractTextFromFile方法。我使用构造函数和Lombok注释@RequiredArgsConstructor注入类ExtractTextFromFile

@Component

@RequiredArgsConstructor

 public class GlobalSearch implements Runnable{

 public final ExtractTextFromFile extractTextFromFile; (41 lines)

 public File file;

 public Long id;

 public GlobalSearch(File File, Long id){

    this.file = file;

    this.id = id;

}

public void index(File file, Long id) {

    File textFile = extractTextFromFile.toText(file, id);

 ... code of this method

}

@Override

public void run() {

    index(file, id);

}

...other methods

public void search(){...}

public String delete(){...}

}

..但IDE给出Variable 'extractTextFromFile' might not have been initialize了public final ExtractTextFromFile extractTextFromFile;

如果我使用注入：

@Autowired

ExtractTextFromFile extractTextFromFile;

然后给出错误：

Exception in thread "GlobalSearch" java.lang.NullPointerException

at bps.module.zxc.component.GlobalSearch.index(GlobalSearch.java:41)

at bps.module.zxc.component.GlobalSearch.run(GlobalSearch.java:136)

at java.lang.Thread.run(Thread.java:748)

此类ExtractTextFromFile：

@Component

@RequiredArgsConstructor

 public class ExtractTextFromFile {

 public File toText(File file, Long id) {

  extractFromPfd();

  extractFromWord();

 }

  extractFromPfd(){...};

  extractFromWord(){...};

 }

Answer 1

我解决了这个问题，删除了GlobalSearch和ExtractTextFromFile类的注解@Component，然后将它们初始化为简单的句点 GlobalSearch globalSearch = new GlobalSearch()...和 ExtractTextFromFile extractTextFromFile = new ExtractTextFromFile()