#414 Cleanup pom and extract versions to properties

pom.xml

@@ -13,6 +13,22 @@
         <java.version>11</java.version>
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
+
+        <!-- 3rd party dependencies -->
+        <nimbus.version>9.19</nimbus.version>
+        <jackson.version>2.13.3</jackson.version>
+        <json-schema.version>1.14.1</json-schema.version>
+        <lombock.version>1.18.24</lombock.version>
+        <typesafe-config.version>1.4.2</typesafe-config.version>
+        <spring-web.version>5.3.21</spring-web.version>
+        <guice.version>5.1.0</guice.version>
+        <logback.version>1.2.11</logback.version>
+        <jcommander.version>1.82</jcommander.version>
+
+        <junit.version>5.8.2</junit.version>
+        <maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>
+        <maven-checkstyle-plugin.version>3.1.2</maven-checkstyle-plugin.version>
+
     </properties>
 
     <modules>
@@ -46,83 +62,72 @@
             <dependency>
                 <groupId>com.fasterxml.jackson.core</groupId>
                 <artifactId>jackson-databind</artifactId>
-                <version>2.13.3</version>
+                <version>${jackson.version}</version>
             </dependency>
             <dependency>
                 <groupId>com.fasterxml.jackson.core</groupId>
                 <artifactId>jackson-annotations</artifactId>
-                <version>2.13.3</version>
+                <version>${jackson.version}</version>
                 <scope>compile</scope>
             </dependency>
 
             <dependency>
                 <groupId>com.nimbusds</groupId>
                 <artifactId>nimbus-jose-jwt</artifactId>
-                <version>9.19</version>
+                <version>${nimbus.version}</version>
             </dependency>
 
             <dependency>
                 <groupId>com.github.erosb</groupId>
                 <artifactId>everit-json-schema</artifactId>
-                <version>1.14.1</version>
+                <version>${json-schema.version}</version>
             </dependency>
 
             <dependency>
                 <groupId>org.springframework</groupId>
                 <artifactId>spring-web</artifactId>
-                <version>5.3.21</version>
+                <version>${spring-web.version}</version>
             </dependency>
 
             <dependency>
                 <groupId>com.google.inject</groupId>
                 <artifactId>guice</artifactId>
-                <version>5.1.0</version>
+                <version>${guice.version}</version>
             </dependency>
             <dependency>
                 <groupId>ch.qos.logback</groupId>
                 <artifactId>logback-classic</artifactId>
-                <version>1.2.11</version>
+                <version>${logback.version}</version>
             </dependency>
 
             <dependency>
                 <groupId>com.beust</groupId>
                 <artifactId>jcommander</artifactId>
-                <version>1.82</version>
+                <version>${jcommander.version}</version>
             </dependency>
             <dependency>
                 <groupId>com.typesafe</groupId>
                 <artifactId>config</artifactId>
-                <version>1.4.2</version>
+                <version>${typesafe-config.version}</version>
             </dependency>
             <dependency>
                 <groupId>org.projectlombok</groupId>
                 <artifactId>lombok</artifactId>
-                <version>1.18.24</version>
+                <version>${lombock.version}</version>
                 <scope>provided</scope>
             </dependency>
 
-            <dependency>
-                <groupId>org.hibernate</groupId>
-                <artifactId>hibernate-validator</artifactId>
-                <version>7.0.1.Final</version>
-            </dependency>
-
-            <dependency>
-                <groupId>org.openapitools</groupId>
-                <artifactId>jackson-databind-nullable</artifactId>
-                <version>0.2.0</version>
-            </dependency>
-
+            <!-- Testing -->
             <dependency>
                 <groupId>org.junit.jupiter</groupId>
                 <artifactId>junit-jupiter</artifactId>
-                <version>5.8.2</version>
+                <version>${junit.version}</version>
                 <scope>test</scope>
             </dependency>
             <dependency>
                 <groupId>org.junit</groupId>
                 <artifactId>junit-bom</artifactId>
-                <version>5.8.2</version>
+                <version>${junit.version}</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
@@ -134,7 +139,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.10.1</version>
+                <version>${maven-compiler-plugin.version}</version>
                 <configuration>
                     <source>11</source>
                     <target>11</target>
@@ -143,7 +148,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>3.1.2</version>
+                <version>${maven-checkstyle-plugin.version}</version>
                 <configuration>
                     <configLocation>checkstyle.xml</configLocation>
                 </configuration>