update to java 8

Author: BCaxelbecker

pom.xml

@@ -26,7 +26,7 @@
 <arangodb.velocypack.version>1.4.1</arangodb.velocypack.version>
 
 <!-- provided -->
-<httpclient.version>4.5.1</httpclient.version>
+<httpclient.version>4.5.7</httpclient.version>
 
 <!-- test -->
 <logback-classic.version>1.1.3</logback-classic.version>
@@ -74,10 +74,34 @@
 
 <build>
 <plugins>
+
+<plugin>
+<inherited>true</inherited>
+<groupId>org.apache.maven.plugins</groupId>
+<artifactId>maven-enforcer-plugin</artifactId>
+<version>3.0.0-M2</version>
+<executions>
+<execution>
+<id>enforce-maven-3</id>
+<goals>
+<goal>enforce</goal>
+</goals>
+<configuration>
+<rules>
+<requireMavenVersion>
+<version>3.0.5</version>
+</requireMavenVersion>
+</rules>
+<fail>true</fail>
+</configuration>
+</execution>
+</executions>
+</plugin>
+
 <plugin>
 <groupId>org.sonatype.plugins</groupId>
 <artifactId>nexus-staging-maven-plugin</artifactId>
-<version>1.6.5</version>
+<version>1.6.8</version>
 <extensions>true</extensions>
 <configuration>
 <serverId>ossrh</serverId>
@@ -90,7 +114,6 @@
 <plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-assembly-plugin</artifactId>
-<version>2.4.1</version>
 <executions>
 <execution>
 <id>assembly</id>
@@ -115,18 +138,16 @@
 <plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-compiler-plugin</artifactId>
-<version>3.2</version>
 <configuration>
-<source>1.6</source>
-<target>1.6</target>
+<source>1.8</source>
+<target>1.8</target>
 <compilerArgument></compilerArgument>
 </configuration>
 </plugin>
 
 <plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-resources-plugin</artifactId>
-<version>2.7</version>
 <configuration>
 <encoding>UTF-8</encoding>
 </configuration>
@@ -135,7 +156,6 @@
 <plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-source-plugin</artifactId>
-<version>2.4</version>
 <executions>
 <execution>
 <goals>
@@ -148,7 +168,6 @@
 <plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-javadoc-plugin</artifactId>
-<version>2.9.1</version>
 <executions>
 <execution>
 <id>attach-javadocs</id>
@@ -165,7 +184,6 @@
 
 <plugin>
 <artifactId>maven-surefire-plugin</artifactId>
-<version>2.19.1</version>
 <configuration>
 <includes>
 <include>**/*Test.java</include>
@@ -176,7 +194,6 @@
 
 <plugin>
 <artifactId>maven-deploy-plugin</artifactId>
-<version>2.8.2</version>
 <configuration>
 <uniqueVersion>false</uniqueVersion>
 <retryFailedDeploymentCount>10</retryFailedDeploymentCount>
@@ -186,7 +203,6 @@
 <plugin>
 <groupId>org.apache.maven.plugins</groupId>
 <artifactId>maven-gpg-plugin</artifactId>
-<version>1.5</version>
 <executions>
 <execution>
 <id>sign-artifacts</id>