I'm trying to restart spring boot application after executing an application.
So I've added a context in the main class:
#SpringBootApplication
public class MainApplication {
private static ConfigurableApplicationContext context;
public static void main(String[] args) { context = SpringApplication.run(MainApplication.class, args); }
public static void restart() {
ApplicationArguments args = context.getBean(ApplicationArguments.class);
Thread thread = new Thread(() -> {
context.close();
context = SpringApplication.run(MainApplication.class, args.getSourceArgs());
});
thread.setDaemon(false);
thread.start();
}
}
To call the restart method, Here is the Service:
#EventListener(ApplicationReadyEvent.class)
#Transactional
public void saveMaths() {
int maths = 0;
List<User> users;
try {
users = userRepository.findByMathsWhereNull();
for (User user : users) {
maths = calculateMaths(user);
user.setMaths(maths);
userRepository.updateUser(maths, user.getId());
}
} finally {
restart();
}
}
public void restart() {
Application.restart();
}
But unfortunatelly, if the principal method works, I've a null pointer exception in the finally restart().
I've instanciated maths and users list just to be sure and once again, this method works. What did I do wrong?
Related
in my spring boot application I'm using main arguments to pass variables and need to call a method to save an object into database based on some code in main class.
I'm using main class like that:
#SpringBootApplication
public class MainClass {
#Autowired
private RecordingService recordingService;
public MainClass(String arg1, String arg2) {
this.setArg1(arg1);
this.setArg2(arg2);
}
public static void main(String args[]) {
String ip = null;
String op = null;
if (args != null & args.length > 0) {
for (int i = 0; i < args.length; i++) {
if (args[i].equalsIgnoreCase("-ip")) {
ip = args[i + 1].trim();
} else if (args[i].equalsIgnoreCase("-op")) {
op = args[i + 1].trim();
}
i++;
}
}
if (ip == null || op == null) {
System.out.println("Invalid input or output path.");
} else {
MainClass reader = new MainClass(ip, op);
Recording recording = new Recording();
.
.
some code...
.
.
this.recordingService.insertIntoDB(recording);
}
}
}
}
And this is service class:
#Service
public class RecordingService {
#Autowired
private RecordingRepository recordingRepository;
public RecordingService() {
}
public void insertToDatabase(Recording recording) {
try {
Recording recording = new Recording();
this.recordingRepository.save(recording);
} catch (Exception e) {
e.printStackTrace();
}
}
}
When I run this code I get NullPointerException, What is the mistake in this code?
You are starting the main method without Spring so Spring won't create RecordingService. It can be changed using CommandLineRunner:
#SpringBootApplication
public class MainClass implements CommandLineRunner {
#Autowired
private RecordingService recordingService;
public static void main(String[] args) {
SpringApplication.run(MainClass.class, args);
}
#Override
public void run(String... args) {
//your main code here
}
}
I am trying to connect to websocket server endpoint using below code but I am not able to resolve container.connectToServer(this, cec, uri); this. This method is not able to take my class as Endpoint class. It's a spring boot project. If I don't pass config then it accepts but then it fails to connect to server and return 401. I have tried many online links but failed to resolve this issue. Need help in how to fix it.
#ClientEndpoint
public class TestClassEndpoint {
private Session userSession = null;
public TestClassEndpoint(URI uri) {
try {
WebSocketContainer container = ContainerProvider.getWebSocketContainer();
ClientEndpointConfig cec = ClientEndpointConfig.Builder
.create().configurator(new ClientEndpointConfig.Configurator() {
public void beforeRequest(Map<String, List<String>> headers) {
System.out.println("Setting user cookie in beforeRequest ...");
headers.put("Authorization", Arrays.asList("Basic base64encodedString"));
}
}).build();
container.connectToServer(this, cec, uri);
} catch (Exception e) {
e.printStackTrace();
}
}
#OnOpen
public void onOpen(Session session) {
this.userSession = session;
System.out.println("New connection established");
}
#OnMessage
public void onMessage(String message, Session session) {
System.out.println(message);
}
#OnClose
public void onClose(Session userSession, CloseReason reason) {
this.userSession = null;
System.out.println("connection closed");
}
#OnError
public void onError(Throwable t) {
}
private void sendMessage(ByteBuffer buffer) {
this.userSession.getAsyncRemote().sendBinary(buffer);
}
}
Main class
#SpringBootApplication
public class MainApplication implements CommandLineRunner {
public static void main(String[] args) {
SpringApplication.run(TwilioPocApplication.class, args);
}
#Override
public void run(String... args) throws Exception {
URI uri = UriComponentsBuilder.fromUriString("server_url").build().toUri();
new TestClassEndpoint(uri);
}
}
I need to use autowired in more than one class with ScheduledExecutorService, what I have tried is shown in this code. logging size of User list in below example always shows 0, even after user added to arraylist. How to properly use Autowired and ScheduledExecutorService in spring boot?
#Component
public class AnotherClass {
List<User> users = new ArrayList();
public void addUser(User user){
users.add(user);
}
public void logUsers(){
logger.info("User size " + users.size()); <================= Always logs 0, when called from executor
}
}
#RestController
public class SecondClass {
#Autowired
private AnotherClass anotherClass;
#GetMapping(value="/user/test")
public void logUsers(){
anotherClass.addUser(new User());
}
}
Application Class
#Component
#SpringBootApplication
public class SpringBootDemoApplication {
private ScheduledExecutorService exec = Executors.newScheduledThreadPool(1);
#Autowired
private AnotherClass anotherClass;
#PostConstruct
public void init() {
logger();
}
public static void main(String[] args) {
SpringApplication.run(SpringBootDemoApplication.class, args);
}
public void logger(){
exec.scheduleAtFixedRate(new Runnable(){
#Override
public void run(){
try {
anotherClass.logUsers();
}catch (Exception e){
}
}
}, 2000, 1000, TimeUnit.MILLISECONDS);
}
}
The code works if you use the Spring #Autowired and not the #AutoWired Annotation.
To start my application, I'm avoiding the "implements CommandLineRunner" process to do the setup but I am facing a problem in this line
fxmlLoader.setControllerFactory(springContext::getBean);
where fxmlLoader is an instance of FxmlLoader and springContext ia an instance of ConfigurableApplicationContext. I am facing this error,
"The method setControllerFactory(Callback<Class<?>,Object>) in the
type FXMLLoader is not applicable for the arguments
(springContext::getBean)".
Can anyone help me with the exact syntax? My imported package reports an error as
"The type org.springframework.beans.factory.annotation.Autowire
cannot be resolved. It is indirectly referenced from required .class
files" .
ok, ive understood that this would require a little code, but ive found already built project with a solution similar to what ive proposed - heres example https://github.com/ruslanys/sample-spring-boot-javafx
you just to tie javafx to spring with context.getAutowireCapableBeanFactory().autowireBean(this);
in AbstractJavaFxApplicationSupport.java file
code will look like this
public abstract class AbstractJavaFxApplicationSupport extends Application {
private static String[] savedArgs;
protected ConfigurableApplicationContext context;
#Override
public void init() throws Exception {
context = SpringApplication.run(getClass(), savedArgs);
context.getAutowireCapableBeanFactory().autowireBean(this);
}
#Override
public void stop() throws Exception {
super.stop();
context.close();
}
protected static void launchApp(Class<? extends AbstractJavaFxApplicationSupport> appClass, String[] args) {
AbstractJavaFxApplicationSupport.savedArgs = args;
Application.launch(appClass, args);
}
}
and tie all you view like bean
#Configuration
public class ControllersConfiguration {
#Bean(name = "mainView")
public ViewHolder getMainView() throws IOException {
return loadView("fxml/main.fxml");
}
#Bean
public MainController getMainController() throws IOException {
return (MainController) getMainView().getController();
}
protected ViewHolder loadView(String url) throws IOException {
InputStream fxmlStream = null;
try {
fxmlStream = getClass().getClassLoader().getResourceAsStream(url);
FXMLLoader loader = new FXMLLoader();
loader.load(fxmlStream);
return new ViewHolder(loader.getRoot(), loader.getController());
} finally {
if (fxmlStream != null) {
fxmlStream.close();
}
}
}
public class ViewHolder {
private Parent view;
private Object controller;
public ViewHolder(Parent view, Object controller) {
this.view = view;
this.controller = controller;
}
public Parent getView() {
return view;
}
public void setView(Parent view) {
this.view = view;
}
public Object getController() {
return controller;
}
public void setController(Object controller) {
this.controller = controller;
}
}
}
then in controller you may enjoy spring magic and javafx magic together
public class MainController {
#Autowired private ContactService contactService;
#FXML private TableView<Contact> table;
#FXML private TextField txtName;
#FXML private TextField txtPhone;
#FXML private TextField txtEmail;}
and just start your app like this
#SpringBootApplication
public class Application extends AbstractJavaFxApplicationSupport {
#Value("${ui.title:JavaFX приложение}")//
private String windowTitle;
#Qualifier("mainView")
#Autowired
private ControllersConfiguration.ViewHolder view;
#Override
public void start(Stage stage) throws Exception {
stage.setTitle(windowTitle);
stage.setScene(new Scene(view.getView()));
stage.setResizable(true);
stage.centerOnScreen();
stage.show();
}
public static void main(String[] args) {
launchApp(Application.class, args);
}}
I want check some external http service before my Spring Boot is ready.
The url to the external web service are stored in a property file with a #ConfigurationProperties class.
How do this check i tried using a springApplication.addListner() with a ping method. But the property class have not then been initialized.
public class ApplicationStartListener implements ApplicationListener<ApplicationPreparedEvent> {
#Override
public void onApplicationEvent(ApplicationPreparedEvent event) {
String url = AppProp.getURL();
inet = InetAddress.getByName(url );
inet.isReachable(5000)
...
application.yml
tops:
http://service.com
#Component
#ConfigurationProperties("tops")
public class AppProp{
private static String url;
public static String getUrl() {
The easiest way to accomplish this is to implement the ApplicationRunner interface.
From the Spring Boot documentation [1]
If you need to run some specific code once the SpringApplication has started, you can implement the ApplicationRunner or CommandLineRunner interfaces. Both interfaces work in the same way and offer a single run method which will be called just before SpringApplication.run(…) completes.
[1] https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-spring-application.html#boot-features-command-line-runner
Assuming you have url defined in application.properties:
#SpringBootApplication
public class MyApplication implements ApplicationRunner
{
#Inject
private AppConfig appConfig;
#Inject
private ConfigurableApplicationContext applicationContext;
public static void main(String[] args)
{
SpringApplication.run(MyApplication.class, args);
}
#Override
public void run(ApplicationArguments args) throws Exception
{
InetAddress inetAddress = InetAddress.getByName(appConfig.getUrl());
if (!inetAddress.isReachable(5000))
{
// Stop the application or do other things
}
}
#Component
#ConfigurationProperties
public static class AppConfig
{
private String url;
public String getUrl()
{
return url;
}
public void setUrl(String url)
{
this.url = url;
}
}
}
If you need even more control than this, you can use SpringApplicationRunListener [2]
[2] http://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/SpringApplicationRunListener.html
#SpringBootApplication
public class MyApplication implements SpringApplicationRunListener
{
public MyApplication() { }
public MyApplication(SpringApplication springApplication, String[] args) { }
public static void main(String[] args)
{
SpringApplication.run(MyApplication.class, args);
}
#Override
public void started() { }
#Override
public void environmentPrepared(ConfigurableEnvironment environment)
{
// 1st opportunity
InetAddress inetAddress = InetAddress.getByName(environment.getProperty("url"));
if (!inetAddress.isReachable(5000))
{
// Stop the application or do other things
}
}
#Override
public void contextPrepared(ConfigurableApplicationContext context)
{
// 2nd opportunity
InetAddress inetAddress = InetAddress.getByName(context.getEnvironment().getProperty("url"));
if (!inetAddress.isReachable(5000))
{
// Stop the application or do other things
}
}
#Override
public void contextLoaded(ConfigurableApplicationContext context)
{
// 3rd opportunity
InetAddress inetAddress = InetAddress.getByName(context.getEnvironment().getProperty("url"));
if (!inetAddress.isReachable(5000))
{
// Stop the application or do other things
}
}
#Override
public void finished(ConfigurableApplicationContext context, Throwable exception)
{
// 4th opportunity
InetAddress inetAddress = InetAddress.getByName(context.getEnvironment().getProperty("url"));
if (!inetAddress.isReachable(5000))
{
// Stop the application or do other things
}
}
#Component
#ConfigurationProperties
public static class AppConfig {
private String url;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
}
then create META-INF\spring.factories and add
org.springframework.boot.SpringApplicationRunListener=com.foobar.MyApplication