Index: /applications/editors/josm/plugins/build-common.xml
===================================================================
--- /applications/editors/josm/plugins/build-common.xml	(revision 35710)
+++ /applications/editors/josm/plugins/build-common.xml	(revision 35711)
@@ -116,4 +116,13 @@
             encoding="UTF-8" target="${java.lang.version}" source="${java.lang.version}" fork="yes">
             <compilerarg value="-J-Xbootclasspath/p:${toString:jdk8.boot.classpath}" unless:set="isJava9"/>
+            <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED" if:set="isJava16" unless:set="noErrorProne"/>
+            <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED" if:set="isJava16" unless:set="noErrorProne"/>
+            <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED" if:set="isJava16" unless:set="noErrorProne"/>
+            <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED" if:set="isJava16" unless:set="noErrorProne"/>
+            <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED" if:set="isJava16" unless:set="noErrorProne"/>
+            <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED" if:set="isJava16" unless:set="noErrorProne"/>
+            <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED" if:set="isJava16" unless:set="noErrorProne"/>
+            <compilerarg value="-J--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED" if:set="isJava16" unless:set="noErrorProne"/>
+            <compilerarg value="-J--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED" if:set="isJava16" unless:set="noErrorProne"/>
             <compilerarg line="-XDcompilePolicy=simple"/>
             <compilerarg value="-processorpath"/>