debian/changelog

+robocode (1.9.3.3-3) unstable; urgency=medium
+
+  * Use javahelper and add missing library classes to the classpath to fix
+    startup error with Java 11.
+    Thanks to Bardot Jerome for the report. (Closes: #929483)
+
+ -- Markus Koschany <apo@debian.org>  Fri, 24 May 2019 20:12:30 +0200
+
 robocode (1.9.3.3-2) unstable; urgency=medium
 
   * Fix CVE-2019-10648:

debian/control

@@ -8,6 +8,7 @@ Build-Depends:
  debhelper (>= 11),
  default-jdk,
  default-jdk-doc,
+ javahelper,
  junit4,
  junit4-doc,
  libcodesize-java,

debian/robocode.manifest

+usr/share/java/robocode.jar:
+ Class-Path: /usr/share/java/codesize.jar /usr/share/java/picocontainer.jar /usr/share/java/robocode.battle-1.9.3.3.jar /usr/share/java/robocode.core-1.9.3.3.jar /usr/share/java/robocode.host-1.9.3.3.jar /usr/share/java/robocode.repository-1.9.3.3.jar /usr/share/java/robocode.sound-1.9.3.3.jar /usr/share/java/robocode.ui-1.9.3.3.jar /usr/share/java/robocode.ui.editor-1.9.3.3.jar /usr/share/java/roborumble.jar
+ Main-Class: robocode.Robocode

debian/rules

@@ -3,7 +3,7 @@ PKD := $(abspath $(dir $(MAKEFILE_LIST)))
 VER := $(shell dpkg-parsechangelog -l$(PKD)/changelog -SVersion | cut -d- -f1)
 
 %:
-	dh $@
+	dh $@ --with javahelper
 
 override_dh_auto_build:
 	sed -e 's/@RCVER@/$(VER)/g' < debian/misc/robocode.in > debian/misc/robocode