I have a service DocumentServiceImpl.
In it I want to run a method index()
of class GlobalSearch
in background.
@Service
@RequiredArgsConstructor
public class DocumentServiceImpl implements DocumentService {
... any code
@Transactional
public void save(){
...
Thread indexTread = new Thread(new GlobalSearch(file, id), "GlobalSearch");
indexTread.start();
....
}
}
Method index
of class GlobalSearch using method from class ExtractTextFromFile. I inject class ExtractTextFromFile using constructor and Lombok annotation @RequiredArgsConstructor
@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(){...}
}
.. but IDE gives Variable 'extractTextFromFile' might not have been initialize
for public final ExtractTextFromFile extractTextFromFile;
If i inject using:
@Autowired
ExtractTextFromFile extractTextFromFile;
Then it gives error:
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)
This class ExtractTextFromFile:
@Component
@RequiredArgsConstructor
public class ExtractTextFromFile {
public File toText(File file, Long id) {
extractFromPfd();
extractFromWord();
}
extractFromPfd(){...};
extractFromWord(){...};
}
I solved the problem, i removed annotation @Component of classes GlobalSearch and ExtractTextFromFile then i initialised them as simple clases with
GlobalSearch globalSearch = new GlobalSearch()
...and
ExtractTextFromFile extractTextFromFile = new ExtractTextFromFile()
Why don't you try @asyc over the method and @EnableAsyc
@Async
public void looper()
{
try {
Thread.sleep(15000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for(int i=0;i<20000;i++)
{
System.out.println("hitting "+i);
}
}
Use @EnableAsync over configurations
@SpringBootApplication
@EnableAsync
public class SpringbootdemoApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootdemoApplication.class, args);
}
}
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