Upgrade the minimum required Java version to Java 7

Author: plamentotev

pom.xml

@@ -72,8 +72,8 @@
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.3</version>
         <configuration>
-          <source>1.5</source>
-          <target>1.5</target>
+          <source>1.7</source>
+          <target>1.7</target>
         </configuration>
       </plugin>
       <plugin>
@@ -147,15 +147,9 @@
         <configuration>
           <signature>
             <groupId>org.codehaus.mojo.signature</groupId>
-            <artifactId>java15</artifactId>
+            <artifactId>java17</artifactId>
             <version>1.0</version>
           </signature>
-          <ignores>
-            <ignore>org.codehaus.plexus.components.io.attributes.Java7FileAttributes</ignore>
-            <ignore>org.codehaus.plexus.components.io.attributes.Java7AttributeUtils</ignore>
-            <ignore>java.nio.file.*</ignore>
-            <ignore>java.io.File</ignore>
-          </ignores>
         </configuration>
       </plugin>
     </plugins>