Use source/target of 1.6 to build against Java 11.

- Set javadoc plugin source value to 1.6.

Signed-off-by: Roland Grunberg <rgrunber@redhat.com>

slf4j.spec

@@ -30,7 +30,7 @@
 
 Name:           slf4j
 Version:        1.7.30
-Release:        2%{?dist}
+Release:        3%{?dist}
 Epoch:          0
 Summary:        Simple Logging Facade for Java
 # the log4j-over-slf4j and jcl-over-slf4j submodules are ASL 2.0, rest is MIT
@@ -136,6 +136,8 @@ cp -p %{SOURCE1} APACHE-LICENSE
 %pom_xpath_inject "pom:project/pom:properties" "
     <project.build.sourceEncoding>ISO-8859-1</project.build.sourceEncoding>"
 
+%pom_xpath_set "pom:project/pom:properties/pom:required.jdk.version" "1.6"
+
 # Fix javadoc links
 %pom_xpath_remove "pom:links"
 %pom_xpath_inject "pom:plugin[pom:artifactId[text()='maven-javadoc-plugin']]/pom:configuration" "
@@ -177,7 +179,7 @@ sed -i '/Import-Package/s/\}$/};resolution:=optional/' slf4j-api/src/main/resour
 %mvn_package :%{name}-nop
 
 %build
-%mvn_build -f -s
+%mvn_build -f -s -- -Dsource=1.6
 
 %install
 # Compat symlinks
@@ -212,6 +214,10 @@ cp -pr target/site/* $RPM_BUILD_ROOT%{_defaultdocdir}/%{name}-manual
 %{_defaultdocdir}/%{name}-manual
 
 %changelog
+* Thu Jun 25 2020 Roland Grunberg <rgrunber@redhat.com> - 0:1.7.30-3
+- Use source/target of 1.6 to build against Java 11.
+- Set javadoc plugin source value to 1.6.
+
 * Fri Mar 20 2020 Mat Booth <mat.booth@redhat.com> - 0:1.7.30-2
 - Fix broken OSGi metadata