Develop Reference

TokenCredentialTrait not found even when used

I have proper credentials below in the connection String, even after giving the proper connection string does not work. Even though I use the credential variable or not it throws this exception.
public static void main(String[] args) {
startReciever();
TokenCredential credential = new DefaultAzureCredentialBuilder()
.build();
ServiceBusSenderClient sender = new ServiceBusClientBuilder()
.credential(CONNECTION_STRING, credential)
.sender()
.queueName(SIMPLE)
.buildClient();
List<ServiceBusMessage> messages = Arrays.asList(
new ServiceBusMessage("Hello world").setMessageId("1"),
new ServiceBusMessage("Bonjour").setMessageId("2"));
sender.sendMessages(messages);
sender.close();
}
private static void startReciever() {
TokenCredential credential = new DefaultAzureCredentialBuilder()
.build();
ServiceBusReceiverAsyncClient receiver = new ServiceBusClientBuilder()
.credential(CONNECTION_STRING, credential)
.receiver()
.queueName(SIMPLE)
.buildAsyncClient();
Flux<ServiceBusReceivedMessage> serviceBusReceivedMessageFlux = receiver.receiveMessages();
Disposable subscription = serviceBusReceivedMessageFlux.subscribe(message -> {
System.out.printf("Received Seq #: %s%n", message.getSequenceNumber());
System.out.printf("Contents of message as string: %s%n", message.getBody());
});
subscription.dispose();
receiver.close();
}
Dependencies:
<dependencies>
<dependency>
<groupId>com.azure</groupId>
<artifactId>azure-core</artifactId>
<version>1.13.0</version>
</dependency>
<dependency>
<groupId>com.azure</groupId>
<artifactId>azure-messaging-servicebus</artifactId>
<version>7.7.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.azure/azure-identity -->
<dependency>
<groupId>com.azure</groupId>
<artifactId>azure-identity</artifactId>
<version>1.4.6</version>
</dependency>
</dependencies>
Error is
java: cannot access com.azure.core.client.traits.TokenCredentialTrait
class file for com.azure.core.client.traits.TokenCredentialTrait not found

Changing the dependency to
<dependency>
<groupId>com.azure</groupId>
<artifactId>azure-core</artifactId>
<version>1.26.0</version>
</dependency>
solves this issue. azure docs had given 1.13.0 in docs.

Springboot Hystrix properties are not working

I am integrating Hystrix with Springboot application but somehow hystrix properties are not effective i.e. whenever I am calling getSchoolDetails(http://localhost:9003//getSchoolDetails/dummyschool), it's directly going into fallBack method which I want to control based on few Hystrix properties e.g. - requestVolumeThreshold, sleepWindowInMilliseconds etc.
But none of the hystrix properties taking effect.
Please let me know what else I need to do to make Hystrix properties working in springboot application.
Given below is my sample code.
#EnableCircuitBreaker
#EnableHystrix
#SpringBootApplication
public class Application {
private static final Logger log = LoggerFactory.getLogger(Application.class);
public static void main(String[] args) {
System.setProperty("security.basic.enabled", "false");
ApplicationContext ctx = SpringApplication.run(Application.class, args);
log.debug("Spring context loaded");
}
#Bean
public EmbeddedServletContainerFactory servletContainer() {
TomcatEmbeddedServletContainerFactory tomcat = new TomcatEmbeddedServletContainerFactory();
/*LogbackValve logbackValve = new LogbackValve();
// point to logback-access.xml
logbackValve.setFilename("logback-access.xml");
tomcat.addContextValves(logbackValve);*/
return tomcat;
}
}
#RestController
public class SchoolServiceController {
#Autowired
StudentServiceDelegate studentServiceDelegate;
#RequestMapping(value = "/getSchoolDetails/{schoolname}", method = RequestMethod.GET)
public String getStudents(#PathVariable String schoolname) {
System.out.println("Going to call student service to get data!");
return studentServiceDelegate.callStudentServiceAndGetData(schoolname);
}
}
#Service
public class StudentServiceDelegate {
#Autowired
RestTemplate restTemplate;
#HystrixCommand(fallbackMethod = "callStudentServiceAndGetData_Fallback", commandKey = "StudentServiceDelegate")
public String callStudentServiceAndGetData(String schoolname){
System.out.println("Getting School details for " + schoolname);
//"http://localhost:8098/getStudentDetailsForSchool/{schoolname}"
HttpHeaders headers = new HttpHeaders();
headers.add("Accept","application/json");
HttpEntity<String> postEntity = new HttpEntity<>(null, headers);
String response = restTemplate
.exchange("http://localhost:9001/v1/browse/catalog"
, HttpMethod.GET
, postEntity
, new ParameterizedTypeReference<String>() {
}, schoolname).getBody();
System.out.println("Response Received as " + response + " - " + new Date());
return "NORMAL FLOW !!! - School Name - " + schoolname + " ::: " +
" Student Details " + response + " - " + new Date();
}
private String callStudentServiceAndGetData_Fallback(String schoolname, Throwable t) {
System.out.println("Student Service is down!!! fallback route enabled...");
return "CIRCUIT BREAKER ENABLED!!! No Response From Student Service at this moment. " +
" Service will be back shortly - " + new Date();
}
#Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
application.properties
server.port=9003
hystrix.command.StudentServiceDelegate.circuitBreaker.requestVolumeThreshold=5
hystrix.command.StudentServiceDelegate.circuitBreaker.sleepWindowInMilliseconds=60000
hystrix.command.StudentServiceDelegate.metrics.rollingStats.timeInMilliseconds=60000
hystrix.command.StudentServiceDelegate.circuitBreaker.errorThresholdPercentage=50
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.kohls</groupId>
<artifactId>msp-hystrix-sample</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version>
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Camden.SR5</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Newly created service method at 9001 port which is taking more than 5 seconds to respond:
#RequestMapping(value = "/v1/browse/catalog", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public #ResponseBody ResponseEntity<String> getCatalog(HttpServletRequest httpRequest) {
long startTime = System.currentTimeMillis();
MSPResponse response = null;
try {
Thread.sleep(5000);
response = catalogService.getCatalog(httpRequest);
} catch (Exception e) {
System.out.println("Error "+e);
}
long endTime = System.currentTimeMillis() - startTime;
System.out.println("API Time taken "+endTime);
return browseUtil.forwardResponse(response);
}

Unable to consume JSON array using Spring RestTemplate

Am trying to populate a DTO from a published RESTful URL (simple HTTP GET) by using Spring's RestTemplate HTTP Client.
This is the content of the published JSON that I am trying to consume:
[{"startDate":"2017-01-29","cost":"$50000.00","id":1112,"name":"Porsche"},{"startDate":"2017-03-06","cost":"$27000.00","id":38626,"name":"BMW"}]
My DTO:
class DTO {
private String startDate;
private String cost;
private String name;
// Getters and Setters
}
My Response Object:
public class Response {
private static final STRING = "http://www.sample.com/product";
public static List<Object> getCampaigns() {
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<Object[]> responseEntity = (ResponseEntity) restTemplate.getForEntity(URL, Object[].class);
Object[] objects = responseEntity.getBody();
MediaType contentType = responseEntity.getHeaders().getContentType();
HttpStatus statusCode = responseEntity.getStatusCode();
return Arrays.asList(objects);
}
public void static main (String args []) {
List<Object> dtos = getCampaigns();
for (Object dto : dtos) {
System.out.println(dto.toString());
}
}
}
Here's my pom.xml:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.7</version>
</dependency>
</dependencies>
When I run the main() method inside Response, I get the following exception:
00:24:14.191 [main] DEBUG org.springframework.web.client.RestTemplate - GET request for "http://www.sample.com/product" resulted in 200 (OK)
Exception in thread "main" org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class [Ljava.lang.Object;] and content type [application/json;charset=utf-8]
at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:109)
at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:917)
at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:901)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:655)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613)
at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:312)
What am I possibly doing wrong?

Try this
public class Response {
private static final String URL = "http://www.sample.com/product";
public static List<DTO> getCampaigns() {
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<DTO[]> responseEntity = restTemplate.getForEntity(URL, DTO[].class);
DTO[] objects = responseEntity.getBody();
MediaType contentType = responseEntity.getHeaders().getContentType();
HttpStatus statusCode = responseEntity.getStatusCode();
return Arrays.asList(objects);
}
public void static main (String args []) {
List<DTO> dtos = getCampaigns();
for (DTO dto : dtos) {
System.out.println(dto.toString());
}
}
}

use this jackson library instead
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.7</version>
</dependency>

JAX RS, test ETags with JAX RS Client API, Jersey, Glassfish

I always get java.text.ParseException: End of header. exception.
#GET
public Response getTemplate4CustomSkin(#Context final Request request)
{
EntityTag eTag = new EntityTag("123456789");
Response.ResponseBuilder responseBuilder = request.evaluatePreconditions(eTag);
if (responseBuilder == null)
{
System.out.printf("is null");
}
else
{
System.out.printf("is not null");
}
return Response.ok(data.inputStream, data.mimeType).tag(eTag).build();
}
}
#Test
public void testGetFileEtagIsNotChanged() throws UnsupportedEncodingException
{
Client client = ClientBuilder.newClient();
WebTarget target = client.target("someUrl");
EntityTag eTag = new EntityTag("123456789");
Response response = target.request().get();
//send request 2nd time with
response = target.request().header("If-None-Match", response.getEntityTag()).get();
//same result
//response = target.request().header("If-None-Match", response.getEntityTag().getValue()).get();
Assert.assertEquals(eTag, response.getEntityTag());
}
// the following code always throws an exception inside of org.glassfish.jersey.message.internal.HttpHeaderReaderImpl.java class:
private char getNextCharacter(boolean skipWhiteSpace) throws ParseException {
....
// this line of code always throws it:
if(this.index >= this.length) {
throw new ParseException(LocalizationMessages.HTTP_HEADER_END_OF_HEADER(), this.index);
} else {
return this.header.charAt(this.index);
}
}
I run tests via arquillian, dependency versions:
<!--Arquillian JUnit integration: -->
<dependency>
<groupId>org.jboss.arquillian.junit</groupId>
<artifactId>arquillian-junit-container</artifactId>
<version>1.1.8.Final</version>
<scope>test</scope>
</dependency>
<!--glassfish-embedded:-->
<dependency>
<groupId>org.glassfish.main.extras</groupId>
<artifactId>glassfish-embedded-all</artifactId>
<version>4.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jboss.arquillian.container</groupId>
<artifactId>arquillian-glassfish-embedded-3.1</artifactId>
<version>1.0.0.CR4</version>
<scope>test</scope>
</dependency>
How can I resolve it? How can I send a request with "If-None-Match" header inlcuded and don't get an exception?
EDIT:
In order to avoid the error, I had to use wildfly embedded application server instead of glassfish.

Can't get json from Swagger + Jersey

I have RESTful service based on Jersey 1.18.1 and I want to show my API via Swagger.
Firstly I have to get JSON. I read this instruction: Swagger Core Jersey 1.X Project Setup 1.5. Swagger allows to set up a configuration different methods and I decided to use custom Application subclass. I did everything step by step but I can't get JSON which I have to use for swagger-ui.
What I did:
My custom Application
#ApplicationPath("api/v1")
public class DiscountsApp extends Application{
public DiscountsApp() {
BeanConfig beanConfig = new BeanConfig();
beanConfig.setVersion("1.0.2");
beanConfig.setSchemes(new String[]{"http"});
beanConfig.setHost("localhost:8002");
beanConfig.setBasePath("swaggerapi");
beanConfig.setResourcePackage("alexiuscrow.diploma.endpoints");
beanConfig.setScan(true);
}
#Override
public Set<Class<?>> getClasses() {
Set<Class<?>> resources = new HashSet();
resources.add(ShopsResources.class);
//...
resources.add(com.wordnik.swagger.jaxrs.listing.ApiListingResource.class);
resources.add(com.wordnik.swagger.jaxrs.listing.SwaggerSerializers.class);
return resources;
}
}
ShopsResources
#Path("/shops")
#Api(value="/shops", description="Shops")
public class ShopsResources {
#GET
#Produces(MediaType.APPLICATION_JSON)
#ApiOperation(value = "List shops", httpMethod = "GET",
notes = "List nearest or locality shops",
response = Shops.class, responseContainer = "List")
public String getShops(
#ApiParam( value = "Radius", required = false)
#QueryParam("radius") String radiusParam,
#ApiParam( value = "Latitude", required = true)
#QueryParam("lat") String latParam,
#ApiParam( value = "Longitude", required = true)
#QueryParam("lng") String lngParam) throws SQLException{
//The list of Shops objects is serialized to string
//using the custom GSON serializer and I know
//that there is the better method of the solution of this task.
}
}
}
Some dependencies from pom.xml
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>jsr311-api</artifactId>
<version>1.1.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-server</artifactId>
<version>1.18.1</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-servlet</artifactId>
<version>1.18.1</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-bundle</artifactId>
<version>1.18.1</version>
</dependency>
<dependency>
<groupId>com.wordnik</groupId>
<artifactId>swagger-jersey-jaxrs</artifactId>
<version>1.5.1-M2</version>
</dependency>
After deploy application to Tomcat I tried to get http://localhost:8002/swaggerapi but I've got no result.
I didn't find the swagger.json in root of my application (/tomcat8/webapps/app).
What's wrong?
How can I get JSON with my API?

I did not correctly build the url.
Correct:
http://{host}:{port}/{context root of application}/{path from #ApplicationPath}/swagger.json
In my case: http://localhost:8080/app/api/v1/swagger.json
Thx to Ron.

adding a relative path worked for me (this is using .netcore 1.1)
app.UseSwaggerUI(s => {
s.RoutePrefix = "help";
s.SwaggerEndpoint("../swagger/v1/swagger.json", "MySite");
s.InjectStylesheet("../css/swagger.min.css");
});