Remove Jackson dependency on Version infrastructure

Closes gh-808

initializr-generator/src/main/java/io/spring/initializr/util/Version.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -53,12 +53,6 @@ public final class Version implements Serializable, Comparable<Version> {
 
 	private final Qualifier qualifier;
 
-	// For Jackson
-	@SuppressWarnings("unused")
-	private Version() {
-		this(null, null, null, null);
-	}
-
 	public Version(Integer major, Integer minor, Integer patch, Qualifier qualifier) {
 		this.major = major;
 		this.minor = minor;

initializr-generator/src/main/java/io/spring/initializr/util/VersionProperty.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,8 +20,6 @@ import java.io.Serializable;
 import java.util.Arrays;
 import java.util.List;
 
-import com.fasterxml.jackson.annotation.JsonValue;
-
 import org.springframework.util.StringUtils;
 
 /**
@@ -90,7 +88,6 @@ public final class VersionProperty implements Serializable, Comparable<VersionPr
 		return sb.toString();
 	}
 
-	@JsonValue
 	public String toStandardFormat() {
 		return this.property;
 	}

initializr-generator/src/main/java/io/spring/initializr/util/VersionRange.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -44,12 +44,6 @@ public class VersionRange {
 
 	private final boolean higherInclusive;
 
-	// For Jackson
-	@SuppressWarnings("unused")
-	private VersionRange() {
-		this(null, false, null, false);
-	}
-
 	protected VersionRange(Version lowerVersion, boolean lowerInclusive,
 			Version higherVersion, boolean higherInclusive) {
 		this.lowerVersion = lowerVersion;

initializr-web/src/main/java/io/spring/initializr/web/autoconfigure/InitializrAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -155,6 +155,11 @@ public class InitializrAutoConfiguration {
 			return new UiController(metadataProvider);
 		}
 
+		@Bean
+		public InitializrModule InitializrJacksonModule() {
+			return new InitializrModule();
+		}
+
 	}
 
 	/**

initializr-web/src/main/java/io/spring/initializr/web/autoconfigure/InitializrModule.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2012-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.spring.initializr.web.autoconfigure;
+
+import java.io.IOException;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+import io.spring.initializr.util.VersionProperty;
+
+/**
+ * A {@link SimpleModule} that registers custom serializers.
+ *
+ * @author Stephane Nicoll
+ */
+class InitializrModule extends SimpleModule {
+
+	InitializrModule() {
+		super("initializr");
+		addSerializer(new VersionPropertySerializer());
+	}
+
+	private static class VersionPropertySerializer
+			extends StdSerializer<VersionProperty> {
+
+		VersionPropertySerializer() {
+			super(VersionProperty.class);
+		}
+
+		@Override
+		public void serialize(VersionProperty value, JsonGenerator gen,
+				SerializerProvider provider) throws IOException {
+			gen.writeString(value.toStandardFormat());
+		}
+
+	}
+
+}