Limit test threads to 8

Author: rijnb

pom.xml

@@ -72,10 +72,11 @@
 
         <!-- Modules. -->
         <nexus-staging-maven-plugin.version>1.6.7</nexus-staging-maven-plugin.version>
-        <maven-source-plugin.version>3.0.0</maven-source-plugin.version>
+        <maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version>
         <maven-javadoc-plugin.version>2.10.3</maven-javadoc-plugin.version>
         <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
-        <maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version>
+        <maven-source-plugin.version>3.0.0</maven-source-plugin.version>
+        <maven-surefire-plugin.version>9</maven-surefire-plugin.version>
 
         <!-- libraries. -->
         <gson.version>2.6.2</gson.version>
@@ -156,9 +157,17 @@
                 <configuration>
                     <source>${jdk.version}</source>
                     <target>${jdk.version}</target>
-                    <fork>true</fork>
-                    <meminitial>256m</meminitial>
-                    <maxmem>512m</maxmem>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.1${maven-surefire-plugin.version}.1</version>
+                <configuration>
+                    <forkCount>1</forkCount>
+                    <reuseForks>true</reuseForks>
+                    <argLine>-Xmx1024m -XX:MaxPermSize=256m</argLine>
                 </configuration>
             </plugin>
         </plugins>