diff --git a/java_tools/configuration_definition/build.xml b/java_tools/configuration_definition/build.xml
index 946717e4c2..2becfe7640 100644
--- a/java_tools/configuration_definition/build.xml
+++ b/java_tools/configuration_definition/build.xml
@@ -14,6 +14,17 @@
     </target>
 
     <target name="compile" depends="antlr">
+<fail message="Unsupported Java version: ${ant.java.version}. 
+  Make sure that the Java version is 1.8 NOT greater see https://github.com/rusefi/rusefi/issues/3128">
+  <condition>
+    <not>
+      <or>
+        <equals arg1="${ant.java.version}" arg2="1.8"/>
+      </or>
+    </not>
+  </condition>
+</fail>
+
         <mkdir dir="build/classes"/>
         <javac
                 source="${javac.source}"