CI

.ci-maven-settings.xml

+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
+                      http://maven.apache.org/xsd/settings-1.0.0.xsd">
+	<servers>
+		<server>
+			<id>ossrh</id>
+			<username>${env.OSSRH_USER}</username>
+			<password>${env.OSSRH_PASS}</password>
+		</server>
+	</servers>
+	<profiles>
+		<profile>
+			<id>ossrh</id>
+			<activation>
+				<activeByDefault>true</activeByDefault>
+			</activation>
+			<properties>
+				<gpg.executable>${env.GPG_EXECUTABLE}</gpg.executable>
+				<gpg.passphrase>${env.GPG_PASSPHRASE}</gpg.passphrase>
+			</properties>
+		</profile>
+	</profiles>
+</settings>

.gitlab-ci.yml

+stages:
+  - compile
+  - deploy
+
+run tests in branches:
+  stage:  compile
+  image:  maven:3-jdk-8
+  script:
+    - MAVEN_OPTS="${MAVEN_OPTS} -Dorg.slf4j.simpleLogger.defaultLogLevel=warn" mvn test -B
+  except:
+    - master
+    - tags
+
+publish artifacts:
+  stage:  deploy
+  image:  maven:3-jdk-8
+  script:
+    - echo "${GPG_KEY_SECRET}" | gpg --allow-secret-key-import --import
+    - gpg --list-keys
+    - mvn clean deploy --settings .ci-maven-settings.xml -B -U
+  only:
+    - master
+    - tags

pom.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <!--
   Copyright 2015 Global Crop Diversity Trust
-  
+
   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.
@@ -46,15 +46,14 @@
 			<organizationUrl>http://www.croptrust.org</organizationUrl>
 		</developer>
 	</developers>
-	
-	<prerequisites>
-		<maven>3.1</maven>
-	</prerequisites>
-	
+
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<jdk.target>1.7</jdk.target>
-		<jdk.source>1.7</jdk.source>
+		<jdk.target>1.8</jdk.target>
+		<jdk.source>1.8</jdk.source>
+
+		<maven-gpg-plugin.version>1.5</maven-gpg-plugin.version>
+		<nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
 
 		<spring.framework.version>4.2.4.RELEASE</spring.framework.version>
 		<log4j.version>1.2.17</log4j.version>
@@ -97,13 +96,14 @@
 			<plugin>
 				<inherited>true</inherited>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.3</version>
+				<version>3.6.1</version>
 				<configuration>
 					<source>${jdk.source}</source>
 					<target>${jdk.target}</target>
 					<optimize>true</optimize>
-					<!--<showDeprecation>${show.deprecations}</showDeprecation> -->
 					<showWarnings>true</showWarnings>
+					<showDeprecation>true</showDeprecation>
+					<failOnWarning>true</failOnWarning>
 				</configuration>
 			</plugin>
 			<plugin>
@@ -114,6 +114,17 @@
 					<pushChanges>false</pushChanges>
 				</configuration>
 			</plugin>
+			<plugin>
+				<groupId>org.sonatype.plugins</groupId>
+				<artifactId>nexus-staging-maven-plugin</artifactId>
+				<version>${nexus-staging-maven-plugin.version}</version>
+				<extensions>true</extensions>
+				<configuration>
+					<serverId>ossrh</serverId>
+					<nexusUrl>https://oss.sonatype.org/</nexusUrl>
+					<autoReleaseAfterClose>true</autoReleaseAfterClose>
+				</configuration>
+			</plugin>
 		</plugins>
 	</build>
 
@@ -154,7 +165,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-gpg-plugin</artifactId>
-						<version>1.6</version>
+						<version>${maven-gpg-plugin.version}</version>
 						<executions>
 							<execution>
 								<id>sign-artifacts</id>
@@ -171,13 +182,16 @@
 	</profiles>
 
 	<distributionManagement>
+		<repository>
+			<id>ossrh</id>
+			<name>Sonatype Releases</name>
+			<url>https://oss.sonatype.org/service/local/staging/deploy/maven2</url>
+		</repository>
 		<snapshotRepository>
 			<id>ossrh</id>
+			<name>Sonatype Snapshots</name>
 			<url>https://oss.sonatype.org/content/repositories/snapshots</url>
+			<uniqueVersion>true</uniqueVersion>
 		</snapshotRepository>
-		<repository>
-			<id>ossrh</id>
-			<url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
-		</repository>
 	</distributionManagement>
-</project>
\ No newline at end of file
+</project>