diff -r 598670d5b0b8 -r 2dfdb79b5344 nbproject/project.properties
--- a/nbproject/project.properties	Tue Nov 28 18:59:13 2017 +0100
+++ b/nbproject/project.properties	Sun Dec 10 16:10:14 2017 +0100
@@ -37,7 +37,8 @@
 j2ee.server.type=Tomcat
 jar.compress=false
 javac.classpath=\
-    ${libs.jstl.classpath}
+    ${libs.jstl.classpath}:\
+    ${libs.SLF4J-JDK.classpath}
 # Space-separated list of extra javac options
 javac.compilerargs=
 javac.debug=true