String configPath = [...]; // Instantiate your configuration path
File file = new File(realPath);
DataSourceProperties dsProp = new DataSourceProperties();
Properties properties = new Properties();
try {
    properties.load(new FileInputStream(file));
} catch (IOException e) {
    throw new TenantNotConfiguredException(tenant); // Custom exception
}

PropertiesConfigurationFactory<DataSourceProperties> pcf = new PropertiesConfigurationFactory<>(dsProp);
pcf.setTargetName(DataSourceProperties.PREFIX);
pcf.setProperties(properties);

try {
    dsProp = pcf.getObject();
} catch (Exception e) {
    e.printStackTrace();
}

return DataSourceBuilder.create()
            .url(dsProp.getUrl())
            .driverClassName(dsProp.getDriverClassName())
            .username(dsProp.getUsername())
            .password(dsProp.getPassword())
            .build();

@Autowired
UserService service;
@Autowired
AppService appService;
////////working on dynamic loading of datasource

@Autowired
Map<String, DataSource> dataSourcesMtApp;

public void updateDataSource(String url, String username, String password, String tenant) {
    try {
        DataSourceBuilder factory1 = DataSourceBuilder.create(MultiTenancyJpaConfiguration.class.getClassLoader()).url(url)
                .username(username).password(password)
                .driverClassName("com.mysql.jdbc.Driver");
        dataSourcesMtApp.put(tenant, factory1.build());
        System.out.println("Size:......................................................" + dataSourcesMtApp.size());
    } catch (Exception ex) {
        Logger.getLogger(AppController.class.getName()).log(Level.SEVERE, null, ex);
    }
}

@PostMapping("/create-account")
public Response createAccount(@RequestBody ConnectionParams request) {
    String tenant = ConnectionUtils.initializeDatabase(request.getDatabase(), request.getDbusername(), request.getDbpassword());
    updateDataSource("jdbc:mysql://localhost:3306/" + request.getDatabase() + "?useSSL=false", request.getDbusername(), request.getDbpassword(), tenant);
    TenantContextHolder.setTenantId(tenant);
    Users user = new Users();
    user.setPassword(request.getLoginpassword());
    user.setUsername(request.getLoginusername());
    user.setTenant(tenant);
    user = service.save(user);
    String response = "Account Setup Completed TenantId: " + tenant + " Username: " + user.getUsername();
    Response rp = new Response();
    rp.setResult(response);
    return rp;
}