Update dependencies and cleanup code
diff --git a/cayenne-jdbc-type-other/pom.xml b/cayenne-jdbc-type-other/pom.xml
index ce36e1d..8b7803d 100644
--- a/cayenne-jdbc-type-other/pom.xml
+++ b/cayenne-jdbc-type-other/pom.xml
@@ -12,10 +12,10 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-        <bootique.version>2.0.M1</bootique.version>
-        <cayenne.version>4.2.M2</cayenne.version>
+        <bootique.version>2.0.1</bootique.version>
+        <cayenne.version>4.2.RC1</cayenne.version>
 
-        <postgres.jdbc.version>9.4.1209</postgres.jdbc.version>
+        <postgres.jdbc.version>42.3.3</postgres.jdbc.version>
         <mysql.jdbc.version>8.0.28</mysql.jdbc.version>
         <slf4j.version>1.7.30</slf4j.version>
 
diff --git a/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/GeoTestCommand.java b/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/GeoTestCommand.java
index af11120..28a9093 100644
--- a/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/GeoTestCommand.java
+++ b/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/GeoTestCommand.java
@@ -14,6 +14,9 @@
 import org.apache.cayenne.query.SQLExec;
 import org.apache.cayenne.value.Wkt;
 
+/**
+ * Command that demonstrates usage of the {@link Wkt} type
+ */
 public class GeoTestCommand extends CommandWithMetadata {
 
     @Inject
diff --git a/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/JsonTestCommand.java b/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/JsonTestCommand.java
index 3a009fc..8dc97d7 100644
--- a/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/JsonTestCommand.java
+++ b/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/JsonTestCommand.java
@@ -5,7 +5,6 @@
 import javax.inject.Provider;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.node.ObjectNode;
 import io.bootique.cli.Cli;
 import io.bootique.command.CommandOutcome;
 import io.bootique.command.CommandWithMetadata;
@@ -15,7 +14,11 @@
 import org.apache.cayenne.demo.model.TestJson;
 import org.apache.cayenne.query.ObjectSelect;
 import org.apache.cayenne.query.SQLExec;
+import org.apache.cayenne.value.Json;
 
+/**
+ * Command that demonstrates usage of the {@link Json} type
+ */
 class JsonTestCommand extends CommandWithMetadata {
 
     @Inject
@@ -45,12 +48,10 @@
     }
 
     private void createJsonObject(ObjectContext context) {
+        Pojo pojo = new Pojo(123, "abc", false);
+
         TestJson testJson = context.newObject(TestJson.class);
-        ObjectNode objectNode = new ObjectNode(objectMapper.getNodeFactory());
-        objectNode.put("test", 123);
-        objectNode.put("field1", "abc");
-        objectNode.put("field2", false);
-        testJson.setJson(objectNode);
+        testJson.setJson(objectMapper.valueToTree(pojo));
         context.commitChanges();
     }
 
@@ -71,4 +72,31 @@
         System.out.println("JSON values for path 'test':");
         testValues.forEach(v -> System.out.println("\t" + v));
     }
+
+    /**
+     * Simple value-object to convert to Json
+     */
+    static class Pojo {
+        private final int test;
+        private final String field1;
+        private final boolean field2;
+
+        Pojo(int test, String field1, boolean field2) {
+            this.test = test;
+            this.field1 = field1;
+            this.field2 = field2;
+        }
+
+        public int getTest() {
+            return test;
+        }
+
+        public String getField1() {
+            return field1;
+        }
+
+        public boolean isField2() {
+            return field2;
+        }
+    }
 }
diff --git a/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/model/types/JsonValueType.java b/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/model/types/JsonValueType.java
index 2005783..b2c35ea 100644
--- a/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/model/types/JsonValueType.java
+++ b/cayenne-jdbc-type-other/src/main/java/org/apache/cayenne/demo/model/types/JsonValueType.java
@@ -7,6 +7,9 @@
 import org.apache.cayenne.value.Json;
 import org.apache.cayenne.di.Inject;
 
+/**
+ * This value type allows to use Jackson's {@link ObjectNode} directly as a Json value
+ */
 public class JsonValueType implements ValueObjectType<ObjectNode, Json> {
 
     @Inject
diff --git a/cayenne-jdbc-type-other/src/main/resources/config.yml b/cayenne-jdbc-type-other/src/main/resources/config.yml
index 28755cc..cbcc8fc 100644
--- a/cayenne-jdbc-type-other/src/main/resources/config.yml
+++ b/cayenne-jdbc-type-other/src/main/resources/config.yml
@@ -12,5 +12,5 @@
   datasource: geo
   createSchema: true
   maps:
-    - location: classpath:demo.map.xml
-      name: map1
\ No newline at end of file
+    map1:
+      location: classpath:demo.map.xml
\ No newline at end of file