GNM-935 Liste aller backend-Libraries erstellen POM aufgeräumt

pom.xml

diff --git a/pom.xml b/pom.xml
index 3de10ff..46ba4ba 100644
--- a/pom.xml
+++ b/pom.xml
@@ -17,23 +17,29 @@
     <name>mics-central-service</name>
 
     <properties>
+        <java-source-target-version>1.8</java-source-target-version>
         <maven.test.skip>false</maven.test.skip>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <dropwizard.version>1.2.0</dropwizard.version>
         <mainClass>org.eclipse.openk.MicsCentralApplication</mainClass>
+
+        <dropwizard.version>1.3.1</dropwizard.version>
         <easymock.version>3.4</easymock.version>
         <powermock-api-easymock.version>1.6.6</powermock-api-easymock.version>
         <jacoco-maven-plugin.version>0.7.9</jacoco-maven-plugin.version>
-        <sonar-maven-plugin.version>3.0.2</sonar-maven-plugin.version>
+        <sonar-maven-plugin.version>3.2</sonar-maven-plugin.version>
         <commons-io.version>2.5</commons-io.version>
-        <gson.version>2.8.0</gson.version>
-        <httpclient.version>4.5.2</httpclient.version>
-        <swagger-core-version>1.5.15</swagger-core-version>
+        <gson.version>2.8.1</gson.version>
+        <httpclient.version>4.5.3</httpclient.version>
         <swagger-maven-plugin-version>3.1.6</swagger-maven-plugin-version>
         <swagger-core-version>1.5.17</swagger-core-version>
         <swagger-annotations-version>1.5.13</swagger-annotations-version>
         <swagger-jersey2-jaxrs>1.5.10</swagger-jersey2-jaxrs>
+        <maven-shade-plugin.version>2.4.1</maven-shade-plugin.version>
+        <maven-jar-plugin-version>2.6</maven-jar-plugin-version>
+        <maven-compiler-plugin-version>3.6.1</maven-compiler-plugin-version>
+        <maven-source-plugin-version>2.4</maven-source-plugin-version>
+        <maven-javadoc-plugin-version>2.10.3</maven-javadoc-plugin-version>
     </properties>
 
     <dependencyManagement>
@@ -115,7 +121,7 @@
         <plugins>
             <plugin>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>2.4.1</version>
+                <version>${maven-shade-plugin.version}</version>
                 <configuration>
                     <createDependencyReducedPom>true</createDependencyReducedPom>
                     <transformers>
@@ -147,7 +153,7 @@
             </plugin>
             <plugin>
                 <artifactId>maven-jar-plugin</artifactId>
-                <version>2.6</version>
+                <version>${maven-jar-plugin-version}</version>
                 <configuration>
                     <archive>
                         <manifest>
@@ -159,15 +165,15 @@
             </plugin>
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.6.1</version>
+                <version>${maven-compiler-plugin-version}</version>
                 <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
+                    <source>${java-source-target-version}</source>
+                    <target>${java-source-target-version}</target>
                 </configuration>
             </plugin>
             <plugin>
                 <artifactId>maven-source-plugin</artifactId>
-                <version>2.4</version>
+                <version>${maven-source-plugin-version}</version>
                 <executions>
                     <execution>
                         <id>attach-sources</id>
@@ -179,7 +185,7 @@
             </plugin>
             <plugin>
                 <artifactId>maven-javadoc-plugin</artifactId>
-                <version>2.10.3</version>
+                <version>${maven-javadoc-plugin-version}</version>
                 <executions>
                     <execution>
                         <id>attach-javadocs</id>