Is there a way to make a transactional action in a #Scheduled method? - spring

Question

So, my application is multi-tenants based, and I need to apply a transactional request each Sunday at 1:00 PM.
It basically needs to get All resources and create Usage (which is an entity per week) based on the actual Date.
My transactional Method :
/**
* Scheduled to run at 1:00 every sunday
* It should create capacities for all resources that doesn't have any for next years
*/
#Transactional
public void createNewCapacities() throws Exception {
LocalDate now = LocalDate.now();
System.out.println("Date is :" + now);
System.out.println("Start of capacities creation...");
//List<Resource> resources = resourceService.findAll();
//for(Resource resource : resources){
//Calendar calendar = calendarService.findCalendarById(resource.getSelectedCalendarId());
...
//}
}
My scheduler :
#Service
public class UsageServiceScheduler {
#Autowired
private UsageService usageService;
#Scheduled(cron= "0 0 1 * * SUN")
public void callScheduledTask() throws Exception {
usageService.createNewCapacities();
}
}
This throw an Exception:
org.springframework.transaction.CannotCreateTransactionException:
Could not open JPA EntityManager for transaction; nested exception is
java.lang.IllegalStateException: Cannot determine target DataSource
for lookup key [null].
Is there a way to establish a connection with the database during the #Scheduled method?
EDIT :
I have both #Transactional and #Scheduled enabled.
TENANT DATA SOURCE PROPERTIES :
#Component
#ConfigurationProperties(prefix = "tenants")
public class TenantDataSourceProperties {
private Map<Object, Object> dataSources = new LinkedHashMap<>();
public Map<Object, Object> getDataSources() {
return dataSources;
}
public void setDataSources(Map<String, Map<String, String>> dataSources) {
dataSources.forEach((key, value) -> this.dataSources.put(key, convert(value)));
}
public DataSource convert(Map<String, String> source) {
return DataSourceBuilder.create()
.url(source.get("jdbcUrl"))
.driverClassName(source.get("driverClassName"))
.username(source.get("username"))
.password(source.get("password"))
.build();
}
}
I want my cron job to run for all existing tenants.
Or in other words, get all the dataSources and apply cron job for each db.