BAEL-4736 - Convert JSONArray to List of Object using camel-jackson (#10316)

* BAEL-4706 - Spring Boot with Spring Batch

* BAEL-3948 - Fix test(s) in spring-batch which leaves repository.sqlite
changed

* BAEL-4736 - Convert JSONArray to List of Object using camel-jackson

Co-authored-by: Jonathan Cook <jcook@sciops.esa.int>

spring-apache-camel/pom.xml

@@ -47,6 +47,17 @@
             <artifactId>camel-spring-javaconfig</artifactId>
             <version>${env.camel.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-jackson</artifactId>
+            <version>${env.camel.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.camel</groupId>
+            <artifactId>camel-test</artifactId>
+            <version>${env.camel.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <properties>

spring-apache-camel/src/main/java/com/baeldung/camel/jackson/Fruit.java

@@ -0,0 +1,24 @@
+package com.baeldung.camel.jackson;
+
+public class Fruit {
+
+    private String name;
+    private int id;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+}

spring-apache-camel/src/main/java/com/baeldung/camel/jackson/FruitList.java

@@ -0,0 +1,17 @@
+package com.baeldung.camel.jackson;
+
+import java.util.List;
+
+public class FruitList {
+
+    private List<Fruit> fruits;
+
+    public List<Fruit> getFruits() {
+        return fruits;
+    }
+
+    public void setFruits(List<Fruit> fruits) {
+        this.fruits = fruits;
+    }
+
+}

spring-apache-camel/src/test/java/com/baeldung/camel/jackson/FruitArrayJacksonUnmarshalUnitTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.camel.jackson;
+
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+
+import org.apache.camel.builder.RouteBuilder;
+import org.apache.camel.component.jackson.ListJacksonDataFormat;
+import org.apache.camel.component.mock.MockEndpoint;
+import org.apache.camel.test.junit4.CamelTestSupport;
+import org.junit.Test;
+
+public class FruitArrayJacksonUnmarshalUnitTest extends CamelTestSupport {
+
+    @Test
+    public void givenJsonFruitArray_whenUnmarshalled_thenSuccess() throws Exception {
+        MockEndpoint mock = getMockEndpoint("mock:marshalledObject");
+        mock.expectedMessageCount(1);
+        mock.message(0).body().isInstanceOf(List.class);
+
+        String json = readJsonFromFile("/json/fruit-array.json");
+        template.sendBody("direct:jsonInput", json);
+        assertMockEndpointsSatisfied();
+
+        @SuppressWarnings("unchecked")
+        List<Fruit> fruitList = mock.getReceivedExchanges().get(0).getIn().getBody(List.class);
+        assertNotNull("Fruit lists should not be null", fruitList);
+
+        assertEquals("There should be two fruits", 2, fruitList.size());
+
+        Fruit fruit = fruitList.get(0);
+        assertEquals("Fruit name", "Banana", fruit.getName());
+        assertEquals("Fruit id", 100, fruit.getId());
+
+        fruit = fruitList.get(1);
+        assertEquals("Fruit name", "Apple", fruit.getName());
+        assertEquals("Fruit id", 101, fruit.getId());
+    }
+    
+    @Override
+    protected RouteBuilder createRouteBuilder() throws Exception {
+        return new RouteBuilder() {
+            @Override
+            public void configure() throws Exception {
+
+                from("direct:jsonInput").unmarshal(new ListJacksonDataFormat(Fruit.class))
+                    .to("mock:marshalledObject");
+            }
+        };
+    }
+
+    private String readJsonFromFile(String path) throws URISyntaxException, IOException {
+        URL resource = FruitArrayJacksonUnmarshalUnitTest.class.getResource(path);
+        return new String(Files.readAllBytes(Paths.get(resource.toURI())));
+    }
+
+}

spring-apache-camel/src/test/java/com/baeldung/camel/jackson/FruitListJacksonUnmarshalUnitTest.java

@@ -0,0 +1,59 @@
+package com.baeldung.camel.jackson;
+
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+
+import org.apache.camel.builder.RouteBuilder;
+import org.apache.camel.component.jackson.JacksonDataFormat;
+import org.apache.camel.component.mock.MockEndpoint;
+import org.apache.camel.test.junit4.CamelTestSupport;
+import org.junit.Test;
+
+public class FruitListJacksonUnmarshalUnitTest extends CamelTestSupport {
+
+    @Test
+    public void givenJsonFruitList_whenUnmarshalled_thenSuccess() throws Exception {
+        MockEndpoint mock = getMockEndpoint("mock:marshalledObject");
+        mock.expectedMessageCount(1);
+        mock.message(0).body().isInstanceOf(FruitList.class);
+
+        String json = readJsonFromFile("/json/fruit-list.json");
+        template.sendBody("direct:jsonInput", json);
+        assertMockEndpointsSatisfied();
+
+        FruitList fruitList = mock.getReceivedExchanges().get(0).getIn().getBody(FruitList.class);
+        assertNotNull("Fruit lists should not be null", fruitList);
+
+        List<Fruit> fruits = fruitList.getFruits();
+        assertEquals("There should be two fruits", 2, fruits.size());
+
+        Fruit fruit = fruits.get(0);
+        assertEquals("Fruit name", "Banana", fruit.getName());
+        assertEquals("Fruit id", 100, fruit.getId());
+
+        fruit = fruits.get(1);
+        assertEquals("Fruit name", "Apple", fruit.getName());
+        assertEquals("Fruit id", 101, fruit.getId());
+    }
+
+    @Override
+    protected RouteBuilder createRouteBuilder() throws Exception {
+        return new RouteBuilder() {
+            @Override
+            public void configure() throws Exception {
+                from("direct:jsonInput").unmarshal(new JacksonDataFormat(FruitList.class))
+                    .to("mock:marshalledObject");
+            }
+        };
+    }
+
+    private String readJsonFromFile(String path) throws URISyntaxException, IOException {
+        URL resource = FruitListJacksonUnmarshalUnitTest.class.getResource(path);
+        return new String(Files.readAllBytes(Paths.get(resource.toURI())));
+    }
+
+}

spring-apache-camel/src/test/resources/json/fruit-array.json

@@ -0,0 +1,10 @@
+[
+	{
+		"id": 100,
+		"name": "Banana"
+	},
+	{
+		"id": 101,
+		"name": "Apple"
+	}
+]

spring-apache-camel/src/test/resources/json/fruit-list.json

@@ -0,0 +1,12 @@
+{
+	"fruits": [
+		{
+			"id": 100,
+			"name": "Banana"
+		},
+		{
+			"id": 101,
+			"name": "Apple"
+		}
+	]
+}