merge into spring-boot module

spring-boot/src/main/java/org/baeldung/Application.java

@@ -0,0 +1,13 @@
+package org.baeldung;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.context.ApplicationContext;
+
+@org.springframework.boot.autoconfigure.SpringBootApplication
+public class Application {
+    private static ApplicationContext applicationContext;
+
+    public static void main(String[] args) {
+        applicationContext = SpringApplication.run(Application.class, args);
+    }
+}

spring-boot/src/main/java/org/baeldung/controller/GenericEntityController.java

@@ -0,0 +1,38 @@
+package org.baeldung.controller;
+
+import org.baeldung.domain.GenericEntity;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RestController
+public class GenericEntityController {
+    private List<GenericEntity> entityList = new ArrayList<>();
+
+    {
+        entityList.add(new GenericEntity(1l, "entity_1"));
+        entityList.add(new GenericEntity(2l, "entity_2"));
+        entityList.add(new GenericEntity(3l, "entity_3"));
+        entityList.add(new GenericEntity(4l, "entity_4"));
+    }
+
+    @RequestMapping("/entity/all")
+    public List<GenericEntity> findAll() {
+        return entityList;
+    }
+
+    @RequestMapping(value = "/entity", method = RequestMethod.POST)
+    public GenericEntity addEntity(GenericEntity entity) {
+        entityList.add(entity);
+        return entity;
+    }
+
+    @RequestMapping("/entity/findby/{id}")
+    public GenericEntity findById(@PathVariable Long id) {
+        return entityList.stream().filter(entity -> entity.getId().equals(id)).findFirst().get();
+    }
+}

spring-boot/src/main/java/org/baeldung/domain/GenericEntity.java

@@ -0,0 +1,42 @@
+package org.baeldung.domain;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class GenericEntity {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+    private String value;
+
+    public GenericEntity() {
+    }
+
+    public GenericEntity(String value) {
+        this.value = value;
+    }
+
+    public GenericEntity(Long id, String value) {
+        this.id = id;
+        this.value = value;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+    }
+}

spring-boot/src/main/java/org/baeldung/repository/GenericEntityRepository.java

@@ -0,0 +1,7 @@
+package org.baeldung.repository;
+
+import org.baeldung.domain.GenericEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface GenericEntityRepository extends JpaRepository<GenericEntity, Long> {
+}