Set explicit Java compiler source/target levels to 1.7

opentest4j.spec

@@ -2,7 +2,7 @@
 
 Name:           opentest4j
 Version:        1.2.0
-Release:        7%{?dist}
+Release:        8%{?dist}
 Summary:        Open Test Alliance for the JVM
 License:        ASL 2.0
 URL:            https://github.com/ota4j-team/opentest4j
@@ -75,7 +75,7 @@ cp -p %{SOURCE100} pom.xml
 sed -i -e '/org\.apache\.commons\.codec/d' src/test/java/org/opentest4j/AssertionFailedErrorTests.java
 
 %build
-%mvn_build
+%mvn_build -- -Dmaven.compiler.source=1.7 -Dmaven.compiler.target=1.7
 
 %install
 %mvn_install
@@ -88,6 +88,9 @@ sed -i -e '/org\.apache\.commons\.codec/d' src/test/java/org/opentest4j/Assertio
 %license LICENSE
 
 %changelog
+* Tue Nov 02 2021 Mikolaj Izdebski <mizdebsk@redhat.com> - 1.2.0-8
+- Set explicit Java compiler source/target levels to 1.7
+
 * Thu Jul 22 2021 Fedora Release Engineering <releng@fedoraproject.org> - 1.2.0-7
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild