calling a method from a different class in springBoot

Question

i want to call a method which is containing applicationContext which works fine when run independently but when i try calling it from a different class appContext.getBean(DataSource.class) returns null.

public class Action {

private static Logger log = LoggerFactory.getLogger(Action.class);

@Autowired
MessageConfigProperties messageProperties;

@Autowired
AutomatorApp automatorApp;

@Autowired
Apps gapps;

@Autowired
Deploy d;

@Autowired
Deploy depstatusChk;

@Autowired
private ApplicationContext appContext;

@Autowired
CreateSaltFileService createSaltFile;

@Autowired
DeployFactory depFactory;

@Autowired
IMoveAppsService moveAppsService;

@Autowired
IUserEnvironmentService userEnvService;

@Autowired
IEnvironmentService envService;

@Autowired
Session session;

private Logger logger = LoggerFactory.getLogger(Action.class);
private ServletContext context;

@Context
public void setServletContext(ServletContext context) {
    System.out.println("servlet context set here");
    this.context = context;
}

@POST
@Path("/register/")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@RequiresRoles("admin")
@RequiresPermissions("automator:register")
public Session register(Session credentials, @BeanParam Session springContext) throws AppException {
    System.out.println("into action class");
    System.out.println("-->>>" +appContext.getBean(DataSource.class));
    appContext.getBean(DataSource.class);
    logger.info(messageProperties.getGreetings());
    // logger.trace("Inside Session");
    System.out.println("Inside Session");
    credentials.setDatasource(springContext.getDatasource());

when this Action method is called from

this method agentGroup in different class

@POST
@Produces(MediaType.APPLICATION_JSON)
@ApiOperation(value = "Get List of agent group", response = 
AgentGroup.class, responseContainer = "List")
public ArrayList<AgentGroup> agentGroup(Session credentials, @BeanParam Session springContext) throws AppException, ConfigException, InterruptedException {

    Session r=objA.register(credentials, springContext);
    int sessionId=r.getSessionId();
}

Answer 1

You @Autowire ApplicationContext appContext just to get datasource (appContext.getBean(DataSource.class)).

Why do not @Autowire DataSource datasource directly? It will make make business logic of your Action class independend from Spring.

If you really want to access ApplicationContext you may try another approach

make Action implements ApplicationContextAware

private ApplicationContext ctx;

  @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        ctx = applicationContext;
    }

See Circular dependency in Spring for details.

edit: your Action class has no annotation. no org.springframework.web.bind.annotation. RestController, no @Component or @Service. are you sure it is managed by Spring? if it is just created using new then Autowire will not work and fields will be null.