Add JSON Schema validation

json/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

json/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>json</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

json/pom.xml

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+<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>org.baeldung</groupId>
+    <artifactId>json</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>org.everit.json</groupId>
+            <artifactId>org.everit.json.schema</artifactId>
+            <version>1.3.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+</project>

json/src/test/java/org/baeldung/json/schema/JSONSchemaTest.java

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+package org.baeldung.json.schema;
+
+import org.everit.json.schema.Schema;
+import org.everit.json.schema.ValidationException;
+import org.everit.json.schema.loader.SchemaLoader;
+
+import org.json.JSONObject;
+import org.json.JSONTokener;
+import org.junit.Test;
+
+public class JSONSchemaTest {
+
+    @Test
+    public void validateJSON() {
+
+        JSONObject jsonSchema = new JSONObject(new JSONTokener(JSONSchemaTest.class.getResourceAsStream("/schema.json")));
+        JSONObject jsonSubject = new JSONObject(new JSONTokener(JSONSchemaTest.class.getResourceAsStream("/product.json")));
+
+        Schema schema = SchemaLoader.load(jsonSchema);
+
+        try {
+
+            schema.validate(jsonSubject);
+        }
+
+        catch (ValidationException e) {
+
+            System.out.println(e.getMessage());
+            e.getCausingExceptions().stream().map(ValidationException::getMessage).forEach(System.out::println);
+        }
+    }
+}

json/src/test/resources/product.json

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+{
+    "id": 1,
+    "name": "Lampshade",
+    "price": 0
+}

json/src/test/resources/schema.json

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+{
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "title": "Product",
+    "description": "A product from the catalog",
+    "type": "object",
+    "properties": {
+        "id": {
+            "description": "The unique identifier for a product",
+            "type": "integer"
+        },
+        "name": {
+            "description": "Name of the product",
+            "type": "string"
+        },
+        "price": {
+            "type": "number",
+            "minimum": 0,
+            "exclusiveMinimum": true
+        }
+    },
+    "required": ["id", "name", "price"]
+}