Bean instantiation via factory method failed - spring-boot

Question

I am getting below error:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'fileStorageServiceBean' defined in com.primesolutions.fileupload.settings.FileStorageProperties: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.primesolutions.fileupload.service.FileStorageService]: Factory method 'fileStorageServiceBean' threw exception; nested exception is java.lang.StackOverflowError
#ConfigurationProperties(prefix = "file")
public class FileStorageProperties {
private String uploadDir;
#Bean
public FileStorageService fileStorageServiceBean() throws Exception{
return new FileOnDiskStorageService(); // some random name; don't exist
}
public String getUploadDir() {
return uploadDir;
}
public void setUploadDir(String uploadDir) {
this.uploadDir = uploadDir;
}
}

Answer 1

Your method:
public FileStorageService fileStorageServiceBean() throws Exception{
return fileStorageServiceBean();
}
Is a recursive function. Which causes the stackOverflowError.

Answer 2

You get a java.lang.StackOverflowError because the method fileStorageServiceBean() is calling itself and that will result in an infinite loop. That code part can never end in this situation.
It could/should be something like:
#Bean
public FileStorageService fileStorageServiceBean() throws Exception{
return new FileOnDiskStorageService(); // some random name; don't exist
}
If you use a good IDE it will warn you about this. It's a good advice to always use a good IDE for Java and read the warnings. Also installing the plugins like SonarQube, Findbugs is really helpful to prevent for code issues.
Also the errors stacktrace will give a line number and some info where in the code the error occurs.