Index: /applications/editors/josm/plugins/build-common.xml
===================================================================
--- /applications/editors/josm/plugins/build-common.xml	(revision 32736)
+++ /applications/editors/josm/plugins/build-common.xml	(revision 32737)
@@ -78,4 +78,6 @@
             <compilerarg value="-Xlint:deprecation"/>
             <compilerarg value="-Xlint:unchecked"/>
+            <compilerarg value="-Xep:ReferenceEquality:OFF"/>
+            <compilerarg line="-Xmaxwarns 1000"/>
             <classpath refid="plugin.classpath"/>
         </javac>