Set explicit Java compiler source/target levels to 1.7

xbean.spec

@@ -2,7 +2,7 @@
 
 Name:           xbean
 Version:        4.18
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Java plugin based web server
 License:        ASL 2.0
 URL:            https://geronimo.apache.org/xbean/
@@ -80,7 +80,7 @@ rm -r xbean-finder/src/main/java/org/apache/xbean/finder{,/archive}/Bundle*
 sed -i '/testGetBytecode/i@org.junit.Ignore' xbean-finder/src/test/java/org/apache/xbean/finder/archive/MJarJarArchiveTest.java
 
 %build
-%mvn_build
+%mvn_build -- -Dmaven.compiler.source=1.7 -Dmaven.compiler.target=1.7
 
 %install
 %mvn_install
@@ -92,6 +92,9 @@ sed -i '/testGetBytecode/i@org.junit.Ignore' xbean-finder/src/test/java/org/apac
 %license LICENSE NOTICE
 
 %changelog
+* Tue Nov 02 2021 Mikolaj Izdebski <mizdebsk@redhat.com> - 4.18-5
+- Set explicit Java compiler source/target levels to 1.7
+
 * Fri Jul 23 2021 Fedora Release Engineering <releng@fedoraproject.org> - 4.18-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild