small fixes to match articles

spring-boot-rest/src/main/java/com/baeldung/SpringBootRestApplication.java

@@ -1,11 +1,13 @@
 package com.baeldung;
 
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
 public class SpringBootRestApplication {
 
+    
     public static void main(String[] args) {
         SpringApplication.run(SpringBootRestApplication.class, args);
     }

spring-boot-rest/src/main/java/com/baeldung/persistence/IOperations.java

@@ -9,7 +9,7 @@ public interface IOperations<T extends Serializable> {
 
     // read - one
 
-    T findOne(final long id);
+    T findById(final long id);
 
     // read - all
 

spring-boot-rest/src/main/java/com/baeldung/persistence/service/common/AbstractService.java

@@ -18,9 +18,8 @@ public abstract class AbstractService<T extends Serializable> implements IOperat
 
     @Override
     @Transactional(readOnly = true)
-    public T findOne(final long id) {
-        return getDao().findById(id)
-            .get();
+    public T findById(final long id) {
+        return getDao().findById(id).orElse(null);
     }
 
     // read - all

spring-boot-rest/src/main/java/com/baeldung/spring/WebConfig.java

@@ -55,7 +55,7 @@ public class WebConfig implements WebMvcConfigurer {
     @Bean
     public FilterRegistrationBean<ShallowEtagHeaderFilter> shallowEtagHeaderFilter() {
         FilterRegistrationBean<ShallowEtagHeaderFilter> filterRegistrationBean = new FilterRegistrationBean<>( new ShallowEtagHeaderFilter());
-        filterRegistrationBean.addUrlPatterns("/auth/foos/*");
+        filterRegistrationBean.addUrlPatterns("/foos/*");
         filterRegistrationBean.setName("etagFilter");
         return filterRegistrationBean;
     }

spring-boot-rest/src/main/java/com/baeldung/web/controller/FooController.java

@@ -5,6 +5,7 @@ import java.util.List;
 import javax.servlet.http.HttpServletResponse;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
@@ -20,6 +21,7 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseStatus;
 import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.server.ResponseStatusException;
 import org.springframework.web.util.UriComponentsBuilder;
 
 import com.baeldung.persistence.model.Foo;
@@ -32,7 +34,7 @@ import com.baeldung.web.util.RestPreconditions;
 import com.google.common.base.Preconditions;
 
 @RestController
-@RequestMapping(value = "/auth/foos")
+@RequestMapping(value = "/foos")
 public class FooController {
 
     @Autowired
@@ -40,6 +42,10 @@ public class FooController {
 
     @Autowired
     private IFooService service;
+    
+
+    @Value("${version}")
+    Integer version;
 
     public FooController() {
         super();
@@ -51,28 +57,36 @@ public class FooController {
     @GetMapping(value = "/{id}/custom-etag")
     public ResponseEntity<Foo> findByIdWithCustomEtag(@PathVariable("id") final Long id,
         final HttpServletResponse response) {
-        final Foo resourceById = RestPreconditions.checkFound(service.findOne(id));
+        final Foo foo = RestPreconditions.checkFound(service.findById(id));
 
         eventPublisher.publishEvent(new SingleResourceRetrievedEvent(this, response));
         return ResponseEntity.ok()
-            .eTag(Long.toString(resourceById.getVersion()))
-            .body(resourceById);
+            .eTag(Long.toString(foo.getVersion()))
+            .body(foo);
     }
 
     // read - one
 
     @GetMapping(value = "/{id}")
     public Foo findById(@PathVariable("id") final Long id, final HttpServletResponse response) {
-        final Foo resourceById = RestPreconditions.checkFound(service.findOne(id));
+        try {
+            final Foo resourceById = RestPreconditions.checkFound(service.findById(id));
+
+            eventPublisher.publishEvent(new SingleResourceRetrievedEvent(this, response));
+            return resourceById;
+        }
+        catch (MyResourceNotFoundException exc) {
+            throw new ResponseStatusException(
+                HttpStatus.NOT_FOUND, "Foo Not Found", exc);
+        }
 
-        eventPublisher.publishEvent(new SingleResourceRetrievedEvent(this, response));
-        return resourceById;
     }
 
     // read - all
 
     @GetMapping
     public List<Foo> findAll() {
+        System.out.println(version);
         return service.findAll();
     }
 
@@ -120,7 +134,7 @@ public class FooController {
     @ResponseStatus(HttpStatus.OK)
     public void update(@PathVariable("id") final Long id, @RequestBody final Foo resource) {
         Preconditions.checkNotNull(resource);
-        RestPreconditions.checkFound(service.findOne(resource.getId()));
+        RestPreconditions.checkFound(service.findById(resource.getId()));
         service.update(resource);
     }
 

spring-boot-rest/src/main/java/com/baeldung/web/controller/RootController.java

@@ -7,34 +7,28 @@ import javax.servlet.http.HttpServletResponse;
 
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Controller;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ResponseStatus;
 import org.springframework.web.util.UriTemplate;
 
 import com.baeldung.web.util.LinkUtil;
 
 @Controller
-@RequestMapping(value = "/auth/")
 public class RootController {
 
-    public RootController() {
-        super();
-    }
-
     // API
 
     // discover
 
-    @RequestMapping(value = "admin", method = RequestMethod.GET)
+    @GetMapping("/")
     @ResponseStatus(value = HttpStatus.NO_CONTENT)
     public void adminRoot(final HttpServletRequest request, final HttpServletResponse response) {
         final String rootUri = request.getRequestURL()
             .toString();
 
-        final URI fooUri = new UriTemplate("{rootUri}/{resource}").expand(rootUri, "foo");
-        final String linkToFoo = LinkUtil.createLinkHeader(fooUri.toASCIIString(), "collection");
-        response.addHeader("Link", linkToFoo);
+        final URI fooUri = new UriTemplate("{rootUri}{resource}").expand(rootUri, "foos");
+        final String linkToFoos = LinkUtil.createLinkHeader(fooUri.toASCIIString(), "collection");
+        response.addHeader("Link", linkToFoos);
     }
 
 }

spring-boot-rest/src/main/java/com/baeldung/web/hateoas/listener/PaginatedResultsRetrievedDiscoverabilityListener.java

@@ -115,7 +115,7 @@ class PaginatedResultsRetrievedDiscoverabilityListener implements ApplicationLis
     protected void plural(final UriComponentsBuilder uriBuilder, final Class clazz) {
         final String resourceName = clazz.getSimpleName()
             .toLowerCase() + "s";
-        uriBuilder.path("/auth/" + resourceName);
+        uriBuilder.path("/" + resourceName);
     }
 
 }

spring-boot-rest/src/main/resources/application.properties

@@ -1,6 +1,7 @@
-server.port=8082
 server.servlet.context-path=/spring-boot-rest
 
 ### Spring Boot default error handling configurations
 #server.error.whitelabel.enabled=false
-#server.error.include-stacktrace=always
+#server.error.include-stacktrace=always
+
+version=1