add project for test update api with spring boot

Author: Freeongoo

rest-jpa-update/.gitignore

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+/src/main/resources/application.properties
+/src/test/resources/application.properties
+/target
+/node_modules
+.gradle
+/build/
+/yarn-error.log
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Cache of project
+.gradletasknamecache
+
+# User-specific stuff:
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/dictionaries
+.idea/artifacts
+
+# Sensitive or high-churn files:
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.xml
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/inspectionProfiles
+
+# Gradle:
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# CMake
+cmake-build-debug/
+
+# Mongo Explorer plugin:
+.idea/**/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Ruby plugin and RubyMine
+/.rakeTasks
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+### JetBrains Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+.idea/misc.xml
+# *.ipr
+
+# Sonarlint plugin
+.idea/sonarlint
+/.idea/.name
+/config.properties
+/src/main/webapp/manifest.json
+/src/main/resources/db.properties
+/src/test/resources/db-test.properties
+/.idea/hotswap_agent.xml

rest-jpa-update/.idea/codeStyles/codeStyleConfig.xml

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+<?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.concretepage</groupId>
+	<artifactId>rest-jpa-update</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>jar</packaging>
+	<name>spring-demo</name>
+	<description>Spring Boot Demo Project</description>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.1.2.RELEASE</version>
+	</parent>
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+	    <dependency>
+		    <groupId>org.springframework.boot</groupId>
+		    <artifactId>spring-boot-starter-data-jpa</artifactId>
+	    </dependency>
+    	<dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-devtools</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-hateoas</artifactId>
+        </dependency>
+
+        <!-- Testing -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.springtestdbunit</groupId>
+            <artifactId>spring-test-dbunit</artifactId>
+            <version>1.3.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.dbunit</groupId>
+            <artifactId>dbunit</artifactId>
+            <version>2.5.4</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.jcabi</groupId>
+            <artifactId>jcabi-matchers</artifactId>
+            <version>1.3</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+</project>

rest-jpa-update/.idea/compiler.xml

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+# Example jpa rest with update problems 
+
+## Configuration
+
+For main and test dirs:
+`cp application.properties.dist application.properties`
+
+# Examples of implementations update
+
+## Classic version
+
+See test: `/src/test/java/hello/controller/classic/EmployeeControllerTest.java`
+
+In controller: 
+```
+@PatchMapping("/{id}")
+public Employee update(@RequestBody Employee employee, @PathVariable Long id) {
+    return service.update(id, employee);
+}
+```
+
+In service:
+```
+public T update(ID id, T entity) {
+    Optional<T> optionalEntityFromDB = getRepository().findById(id);
+    return optionalEntityFromDB
+            .map(e -> saveAndReturnSavedEntity(entity, e))
+            .orElseThrow(getNotFoundExceptionSupplier("Cannot update - not exist entity by id: " + id, OBJECT_NOT_FOUND));
+}
+
+private T saveAndReturnSavedEntity(T entity, T entityFromDB) {
+    entity.setId(entityFromDB.getId());
+    return getRepository().save(entity);
+}
+```
+
+Pros:
+* simple implement
+* auto deserialization to entity in controller
+* enable add Bean Validation from the box (@Valid @RequestBody Employee employee)
+
+Cons:
+* cannot detect passed from json null field or not passed nothing to field
+* wrong behavior when there are no fields in json - these fields will be updated to null anyway