I've used this as core project for one of my project and I am stuck with it.
I trying to use the http method but it fails.
I've tried add the HttpClientModule to the app.module but still nothing.
The error that i get is :
app.ae014c5e7b696f87de83.bundle.js:107 ERROR TypeError:
Cannot read property 'method' of undefined
All I did in the app.component.ts file add
export class AppComponent extends BaseComponent implements OnInit {
constructor(
private readonly i18nStore: Store<I18NState>,
private readonly config: ConfigService,
private http: HttpClient,
#Inject(PLATFORM_ID) public platformId: Object
) {
super();
// TODO: ngx-i18n-router
// private readonly i18nRouter: I18NRouterService) {
}
ngOnInit(): void {
this.i18nStore.dispatch(new Init(this.config.getSettings('i18n')));
}
createUserA(): void {
this.http.get<any>('https://swapi.co/api/people/1')
.subscribe(data => console.log('data', data));
}
}
Bot get and post don't work.
I've imported :
import { HttpClient } from '#angular/common/http';
Add to your app.component.ts
contructor(private http : HttpClient) {}
Related
I'm trying to implement a Contract test on Java as described there.
I paste the first test's code in my project and changed import static net.corda.testing.NodeTestUtils.ledger; to import static net.corda.testing.node.NodeTestUtils.ledger;
package com.template;
import org.junit.Test;
import static net.corda.testing.node.NodeTestUtils.ledger;
public class CommercialPaperTest {
#Test
public void emptyLedger() {
ledger(l -> {
return null;
});
}
}
And I see that ledger method has an absolutely different signature, so Java says that it cannot resolve method ledger(<lambda expression>).
What am I doing wrong?
There is an error on that page. The first argument to ledger should be a MockServices instance.
For example, we might write:
public class CommercialPaperTest {
private static final TestIdentity megaCorp = new TestIdentity(new CordaX500Name("MegaCorp", "London", "GB"));
private MockServices ledgerServices;
#Before
public void setUp() {
ledgerServices = new MockServices(
singletonList("net.corda.finance.contracts"),
megaCorp,
makeTestIdentityService(megaCorp.getIdentity())
);
}
#Test
public void emptyLedger() {
ledger(ledgerServices, l -> {
return null;
});
}
}
I created a custom error page to replace the default whitelabel based on this tutorial. It worked fine but I need to pass other attributes to the page so I changed my code to intercept the error endpoint based on the geoand's answer here.
Here is my final code:
#Controller
public class ErroHandlerController implements ErrorController {
#Value("${terena.midas.location}")
private String midasLocation;
#RequestMapping("/error")
public String handleError( Model model ) {
model.addAttribute( "midasLocation", midasLocation );
return "error";
}
#Override
public String getErrorPath() {
return "/error";
}
}
Well the code worked sending my variable midasLocation but I lost the error details like path, status,message, etc... How can I bring them back again?
You need to use the ErrorAttributes which "provides access to error attributes which can be logged or presented to the user".
Take a look:
at how the default Spring Error Controller does it: BasicErrorController.java
LogicBig -
Spring Boot - Using ErrorAttributes in our custom ErrorController
Basic functionality:
import org.springframework.boot.web.servlet.error.ErrorAttributes;
import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.context.request.WebRequest;
#Controller
public class ErrorHandler implements ErrorController {
private final ErrorAttributes errorAttributes;
public ErrorHandler(ErrorAttributes errorAttributes) {
this.errorAttributes = errorAttributes;
}
#GetMapping("/error")
public String handleError(Model model, WebRequest webRequest) {
model.addAttribute("midasLocation", "xxx");
final Throwable error = errorAttributes.getError(webRequest);
model.addAttribute("exception", error);
model.addAttribute("message", error == null ? "" : error.getMessage());
return "error";
}
#Override public String getErrorPath() {
return "/error";
}
#GetMapping("/throwErrorForTest")
public String throwError() {
throw new RuntimeException("my exception");
}
}
What is recommended/best way to validate the post request DTO bean ?
If validation failed I need to send customized error message like
{
"code": "invalid_fields",
"fields": {
"email": "Required",
"password": "Required",
}
}
DTO model
public class SignUpRequest {
#JsonProperty("email")
String email;
#JsonProperty("password")
String password;
public Result validate(){
}
}
controller
#PostMapping(value = "/register")
public ResponseEntity<Object> signupRider(#RequestBody SignUpRequest signUpRequest) {
Result result = signUpRequest.validate();
return new ResponseEntity<>(x, HttpStatus.OK);
}
SignUpRequest DTO has the method validate.
What is the spring way of doing the validation ?
Thanks.
You can use the following technique.
add the following dependencies in your gradle/maven file
compile "javax.validation:validation-api:2.0.1.Final"
compile "org.hibernate.validator:hibernate-validator:6.0.9.Final"
Hibernate-validator is implementation of validation-api 2.0
Add Validated annotation to your controller class
import org.springframework.validation.annotation.Validated;
#RestController
#RequestMapping(value = "/contact")
#Validated
public class ContactController{
}
Add Valid annotation to your method parameter
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.validation.Valid;
#RestController
#RequestMapping(value = "/contact")
#Validated
public class ContactController{
#PostMapping(value = "/register")
public ResponseEntity<Object> signupRider(#Valid #RequestBody SignUpRequest signUpRequest) {
Result result = signUpRequest.validate();
return new ResponseEntity<>(x, HttpStatus.OK);
}
}
Add Validated annotation to your dto class
import org.springframework.validation.annotation.Validated;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Email;
#Validated
public class SignUpRequest {
#JsonProperty("email")
#Email
String email;
#JsonProperty("password")
#NotNull
String password;
}
Add ExceptionTranslator with RestControllerAdvice annotation
#RestControllerAdvice
public class ExceptionTranslator {
/**
* Exception handler for validation errors caused by method parameters #RequesParam, #PathVariable, #RequestHeader annotated with javax.validation constraints.
*/
#ExceptionHandler
protected ResponseEntity<?> handleConstraintViolationException(ConstraintViolationException exception) {
List<ApiError> apiErrors = new ArrayList<>();
for (ConstraintViolation<?> violation : exception.getConstraintViolations()) {
String value = (violation.getInvalidValue() == null ? null : violation.getInvalidValue().toString());
apiErrors.add(new ApiError(violation.getPropertyPath().toString(), value, violation.getMessage()));
}
return ResponseEntity.badRequest().body(apiErrors);
}
}
Create ApiError class
import com.fasterxml.jackson.annotation.JsonIgnore;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
#Data
#NoArgsConstructor
#AllArgsConstructor
public class ApiError {
#JsonIgnore
private int code;
private String field;
private String value;
private String message;
public ApiError(String message) {
this.message = message;
}
public ApiError(String field, String value, String message) {
this.field = field;
this.value = value;
this.message = message;
}
}
Now if password field is missed you'll see the following response structure:
[
{
"field": "password",
"message": "must be filled"
}
]
If you would like to use some custom logic to validate your fields you may use the following approach
Create specific annotation class
import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
#Constraint(validatedBy = ContactRequiredParametersValidator.class)
#Target({ METHOD, CONSTRUCTOR })
#Retention(RUNTIME)
#Documented
public #interface ContactRequiredParameters {
String message() default
"Email or phone must be filled";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
Create custom validator
import org.apache.commons.lang.StringUtils;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraintvalidation.SupportedValidationTarget;
import javax.validation.constraintvalidation.ValidationTarget;
#SupportedValidationTarget(ValidationTarget.PARAMETERS)
public class ContactRequiredParametersValidator implements ConstraintValidator<ContactRequiredParameters, Object[]> {
#Override
public boolean isValid(Object[] value,
ConstraintValidatorContext context) {
if (value[0] == null) {
return true;
}
if (!(value[0] instanceof SignUpRequest)) {
throw new IllegalArgumentException(
"Illegal method signature, expected two parameters of type LocalDate.");
}
SignUpRequest contact = (SignUpRequest) value[0];
return StringUtils.isNotEmpty(contact.getPassword());
}
}
add #ContactRequiredParameters annotation to your method in controller
#PostMapping(value = "/register")
#ContactRequiredParameters
public ResponseEntity<Object> signupRider(#Valid #RequestBody SignUpRequest signUpRequest)
That's all. Hope it helps
Spring boot supports validation out of the box using validation-api which is included with spring web mvc starter:
#RestController
#RequiredArgsConstructor
public class TestController {
#PutMapping(value = "/", consumes = APPLICATION_JSON_VALUE)
#ResponseStatus(NO_CONTENT)
public void test(#Valid #RequestBody final SignUpRequest params) {
...
}
}
You can annotate your SignUpRequest using annotations such as javax.validation.constraints.NotNull and other more complex ones.
the error messages can be customised with message properties or hard coded strings if i18n/l10n is of less interest to you.
Sample here: https://spring.io/guides/gs/validating-form-input/
If you want behaviour outside of the provided annotations you can write a custom annotation that can do that, e.g.
#Target({FIELD})
#Retention(RUNTIME)
#Constraint(validatedBy = NotPastValidator.class)
#Documented
public #interface NotPast {
String message() default "date must not be in the past";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
Then:
public class NotPastValidator implements ConstraintValidator<NotPast, LocalDate> {
#Override
public void initialize(final NotPast constraintAnnotation) {
// nothing to do.
}
#Override
public boolean isValid(final LocalDate value, final ConstraintValidatorContext context) {
// As the Bean Validation specification recommends, we consider null values as being valid.
return value == null || isDateNotPast(value);
}
private boolean isDateNotPast(final LocalDate value) {
return ...
}
}
And finally just annotate your field:
#NotPast
Of course this is just an example with some code I previously used, you'll need to adapt to your needs.
If you don't want to use the validator API at all you can equally just write your own code to programatically check and throw some type of custom exception when invalid. This can then be caught in the controller and you can send what ever response you want, e.g.
#RestController
public class PaymentController {
#PostMapping(value ="/", consumes = APPLICATION_JSON_VALUE)
public void makePayment(#RequestBody final PaymentParams params) {
// validationService.validate(params);
}
#ExceptionHandler(MyValidationException.class)
public ResponseEntity<ExceptionDto> paymentCardException(final MyValidationException e) {
return status(BAD_REQUEST)
.contentType(APPLICATION_JSON)
.body(new ExceptionDto(e.getMessage));
}
}
I'd say given the validation API is well supported by spring, to me it makes sense to apply declarative validations where possible when using this stack. Custom rules can be a little painful, but you can use a multi faceted approach with some annotation based and equally you can perform some more complex validations in your own service.
This is a custom validation.
#PostMapping
private ResponseEntity<?> addMessage(#RequestBody Message message) {
Map<String, String> response = new HashMap<>();
if (message.getInputMessage() == null || message.getInputMessage().equals("")) {
response.put("status", "E");
response.put("message", "input message can not be empty");
return ResponseEntity.ok(response);
}
int id = messageService.addMessage(message);
if (id <= 0) {
response.put("status", "E");
response.put("message", "add message has error");
return ResponseEntity.ok(response);
}
response.put("status", "S");
response.put("message", "success");
return ResponseEntity.ok(response);
}
I'm a newbie with regards to Angular. I've looked at several places and most of the examples are extremely complicated. Is there something simple which I can start from? Something that calls a web api which accepts 2 parameter and returns an object
[HttpPost("GetHomePageData")]
public HomePageData GetHomePageData(int P1, int P2)
{
//
}
public class HomePageData
{
public int AddressCount { get; set; }
}
In Angular's official documentation you can see examples like this:
#Component(...)
export class MyComponent implements OnInit {
results: string[];
// Inject HttpClient into your component or service.
constructor(private http: HttpClient) {}
ngOnInit(): void {
// Make the HTTP request:
this.http.get('/api/items').subscribe(data => {
// Read the result field from the JSON response.
this.results = data['results'];
});
}
}
I'm using Spark with Java and Angular 1 on client side.
I keep getting this '-1' error when I send request to the server.
The error is "No 'Access-control-allow-origin' header is present on the requested resource. Origin 'http://localhost:4567' is therefore not allowed access."
I understand it's a CORS issue so I add header 'Access-Control-Allow-Origin' : '*' and added it as well to the response on server side.
Unfortunately it doesn't seem to solve my problem.
Need your help guys,
Thanks!
Spark.after() is your friend
package com.company.package;
import static spark.Spark.*;
import com.google.gson.Gson;
import spark.Filter;
import spark.Request;
import spark.Response;
public class MyClass {
public static void main(String[] args) {
final Service service = new ServiceImpl();
after((Filter) (request, response) -> {
response.header("Access-Control-Allow-Origin", "*");
response.header("Access-Control-Allow-Methods", "GET");
});
get( "/something", (req, res)->{
res.type("application/json");
return new Gson().toJsonTree(service.getNodes());
});
}
}
I have used the following successfully (which I found here: https://gist.github.com/zikani03/7c82b34fbbc9a6187e9a):
//add correct package
import com.mpaw.app.controllers.Apply;
import java.util.HashMap;
import spark.Filter;
import spark.Request;
import spark.Response;
import spark.Spark;
/**
* Really simple helper for enabling CORS in a spark application;
*/
public class CorsFilter /*implements Apply*/{
private final HashMap<String, String> corsHeaders = new HashMap<>();
public CorsFilter() {
corsHeaders.put("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE,OPTIONS");
corsHeaders.put("Access-Control-Allow-Origin", "*");
corsHeaders.put("Access-Control-Allow-Headers", "Content-Type,Authorization,X-Requested-With,Content-Length,Accept,Origin,");
corsHeaders.put("Access-Control-Allow-Credentials", "true");
}
#Override
public void apply() {
Filter filter = new Filter() {
#Override
public void handle(Request request, Response response) throws Exception {
corsHeaders.forEach((key, value) -> {
response.header(key, value);
});
}
};
Spark.after(filter);
}
}
Usage:
public static void main(String[] args) {
CorsFilter.apply(); // Call this before mapping thy routes
Spark.get("/hello", (request, response) -> {
return "Hello";
});
}