diff --git a/logback-1.2.3-getCallerClass.patch b/logback-1.2.3-getCallerClass.patch
new file mode 100644
index 0000000..4960505
--- /dev/null
+++ b/logback-1.2.3-getCallerClass.patch
@@ -0,0 +1,59 @@
+--- logback-1.2.3/logback-classic/src/main/java/ch/qos/logback/classic/spi/PackagingDataCalculator.java	2019-11-29 12:40:38.797022563 +0100
++++ logback-1.2.3/logback-classic/src/main/java/ch/qos/logback/classic/spi/PackagingDataCalculator.java	2019-11-29 13:11:30.783272712 +0100
+@@ -17,7 +17,8 @@
+ import java.security.CodeSource;
+ import java.util.HashMap;
+ 
+-import sun.reflect.Reflection;
++import java.lang.reflect.Method;
++import java.lang.reflect.InvocationTargetException;
+ 
+ // import java.security.AccessControlException; import java.security.AccessController;import java.security.PrivilegedAction;
+ /**
+@@ -32,27 +33,6 @@
+ 
+     HashMap<String, ClassPackagingData> cache = new HashMap<String, ClassPackagingData>();
+ 
+-    private static boolean GET_CALLER_CLASS_METHOD_AVAILABLE = false; // private static boolean
+-                                                                      // HAS_GET_CLASS_LOADER_PERMISSION = false;
+-
+-    static {
+-        // if either the Reflection class or the getCallerClass method
+-        // are unavailable, then we won't invoke Reflection.getCallerClass()
+-        // This approach ensures that this class will *run* on JDK's lacking
+-        // sun.reflect.Reflection class. However, this class will *not compile*
+-        // on JDKs lacking sun.reflect.Reflection.
+-        try {
+-            Reflection.getCallerClass(2);
+-            GET_CALLER_CLASS_METHOD_AVAILABLE = true;
+-        } catch (NoClassDefFoundError e) {
+-        } catch (NoSuchMethodError e) {
+-        } catch (UnsupportedOperationException e) {
+-        } catch (Throwable e) {
+-            System.err.println("Unexpected exception");
+-            e.printStackTrace();
+-        }
+-    }
+-
+     public void calculate(IThrowableProxy tp) {
+         while (tp != null) {
+             populateFrames(tp.getStackTraceElementProxyArray());
+@@ -81,8 +61,16 @@
+         int missfireCount = 0;
+         for (int i = 0; i < commonFrames; i++) {
+             Class callerClass = null;
+-            if (GET_CALLER_CLASS_METHOD_AVAILABLE) {
+-                callerClass = Reflection.getCallerClass(localFirstCommon + i - missfireCount + 1);
++            try {
++	            Class<?> reflect = Class.forName("sun.reflect.Reflection");
++	            Method getCallerClass = reflect.getMethod("getCallerClass",Integer.TYPE);
++                callerClass = (Class<?>)(getCallerClass.invoke(null, localFirstCommon + i - missfireCount + 1));
++            } catch (ClassNotFoundException e) {
++            } catch (NoSuchMethodException e) {
++            } catch (IllegalAccessException e) {
++            } catch (InvocationTargetException e) {
++	            System.err.println("Unexpected exception");
++	            e.printStackTrace();
+             }
+             StackTraceElementProxy step = stepArray[stepFirstCommon + i];
+             String stepClassname = step.ste.getClassName();
diff --git a/logback.changes b/logback.changes
index 8c37323..f9b88f2 100644
--- a/logback.changes
+++ b/logback.changes
@@ -1,3 +1,14 @@
+-------------------------------------------------------------------
+Fri Nov 29 12:15:18 UTC 2019 - Fridrich Strba <fstrba@suse.com>
+
+- Do not force building with java < 9
+- Specifiy maven.compiler.release=8 to access the
+  java.util.function.Supplier API, introduced in java 8
+- Added patch:
+  * logback-1.2.3-getCallerClass.patch
+    + Access the sun.reflect.Reflection.getCallerClass by
+      by reflection, in order to be able to build with jdk >= 9
+
 -------------------------------------------------------------------
 Sun Nov 17 19:45:03 UTC 2019 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/logback.spec b/logback.spec
index 21dc7df..25005cf 100644
--- a/logback.spec
+++ b/logback.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package logback
 #
-# Copyright (c) 2019 SUSE LLC.
+# Copyright (c) 2019 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -25,9 +25,9 @@ URL:            https://logback.qos.ch/
 Source0:        %{name}-%{version}.tar.xz
 # Remove deprecated methods
 Patch0:         %{name}-1.1.11-jetty.patch
+Patch1:         logback-1.2.3-getCallerClass.patch
 BuildRequires:  fdupes
 BuildRequires:  maven-local
-BuildRequires:  maven-local
 BuildRequires:  mvn(javax.mail:mail)
 BuildRequires:  mvn(javax.servlet:javax.servlet-api)
 BuildRequires:  mvn(junit:junit)
@@ -45,7 +45,6 @@ BuildRequires:  mvn(org.eclipse.jetty:jetty-util)
 BuildRequires:  mvn(org.fusesource.jansi:jansi)
 BuildRequires:  mvn(org.slf4j:slf4j-api)
 BuildRequires:  mvn(org.slf4j:slf4j-ext)
-BuildConflicts: java-devel >= 9
 #!BuildRequires: groovy-lib
 BuildArch:      noarch
 
@@ -91,6 +90,7 @@ find . -type f -exec chmod -x {} \;
 chmod +x %{name}-examples/src/main/resources/setClasspath.sh
 
 %patch0 -p1
+%patch1 -p1
 
 %pom_remove_plugin :maven-source-plugin
 %pom_remove_plugin :findbugs-maven-plugin
@@ -125,6 +125,9 @@ rm -r %{name}-*/src/test/java/*
 # unavailable test dep maven-scala-plugin
 # slf4jJAR and org.apache.felix.main are required by logback-examples modules for maven-antrun-plugin
 %{mvn_build} -f -- \
+%if %{?pkg_vcmp:%pkg_vcmp java-devel >= 9}%{!?pkg_vcmp:0}
+	-Dmaven.compiler.release=8 \
+%endif
   -Dorg.slf4j:slf4j-api:jar=$(build-classpath slf4j/api) \
   -Dorg.apache.felix:org.apache.felix.main:jar=$(build-classpath felix/org.apache.felix.main)