Merge branch 'hotfix/0.5.1' into prepare/0.6.0

* hotfix/0.5.1:
  jenkins: fix syntax #5
  jenkins: fix syntax #4
  jenkins: fix syntax #3
  jenkins: strong type read pom
  jenkins: fix syntax #2
  jenkins: fix syntax
  Revert "version set to 0.6.0-SNAPSHOT"

Jenkinsfile.groovy

@@ -16,10 +16,7 @@ pipeline {
             when {
                 expression {
                     (env.GIT_BRANCH == 'master') &&
-                            (pom.version).contains("SNAPSHOT") }
-            }
-            steps {
-                error("Build failed because SNAPSHOT version: ${pom.groupId}:${pom.artifactId}:${pom.version}")
+                            (readMavenPom(file: 'pom.xml').version).contains("SNAPSHOT") }
             }
         }
         stage('Build') {

pom.xml

@@ -11,7 +11,7 @@
         <relativePath/>
     </parent>
     <artifactId>mon</artifactId>
-    <version>0.6.0-SNAPSHOT</version>
+    <version>0.5.1</version>
 
     <properties>
         <java.version>1.8</java.version>