Use JAVA_HOME when running example

Author: manuelbl

examples/epaper_display/pom.xml

@@ -83,7 +83,7 @@
           <artifactId>exec-maven-plugin</artifactId>
           <version>3.1.0</version>
           <configuration>
-            <executable>java</executable>
+            <executable>${JAVA_HOME}/bin/java</executable>
             <arguments>
               <argument>--enable-preview</argument>
               <argument>--enable-native-access=ALL-UNNAMED</argument>