set javac source / target version to 1.8 to fix issues with Java 11

antlr-build.xml

@@ -36,7 +36,7 @@
   <!-- Build classes -->
   <target name="classes" depends="prepare">
     <javac srcdir="${src}" destdir="${build.classes}"
-      debug="off" optimize="on" deprecation="on"/>
+      debug="off" optimize="on" deprecation="on" source="1.8" target="1.8" />
   </target>
 
   <!-- Build jar archives -->
@@ -61,6 +61,7 @@
       packagenames="${packagenames}"
       splitindex="true"
       use="true"
+      source="1.8"
       additionalparam="-Xdoclint:none">
       <link href="${j2se.apidoc}"/>
     </javadoc>

antlr.spec

@@ -7,7 +7,7 @@
 Summary:       ANother Tool for Language Recognition
 Name:          antlr
 Version:       2.7.7
-Release:       61%{?dist}
+Release:       62%{?dist}
 Epoch:         0
 License:       ANTLR-PD
 URL:           http://www.antlr2.org/
@@ -210,6 +210,9 @@ cd ../..
 %endif
 
 %changelog
+* Tue Jul 21 2020 Fabio Valentini <decathorpe@gmail.com> - 0:2.7.7-62
+- Set javac source / target version to 1.8 to fix issues with Java 11.
+
 * Fri Jul 10 2020 Jiri Vanek <jvanek@redhat.com> - 0:2.7.7-61
 - Rebuilt for JDK-11, see https://fedoraproject.org/wiki/Changes/Java11