Index: /applications/editors/josm/plugins/build-common.xml
===================================================================
--- /applications/editors/josm/plugins/build-common.xml	(revision 35009)
+++ /applications/editors/josm/plugins/build-common.xml	(revision 35010)
@@ -82,4 +82,8 @@
     <fileset id="jaxb.jars" dir="${plugin.tools.dir}/jaxb-ri/lib" includes="**/*.jar"/>
 
+    <path id="jdk8.boot.classpath">
+        <pathelement location="${error_prone_javac.jar}"/>
+        <fileset refid="jaxb.jars"/>
+    </path>
     <path id="plugin.classpath">
         <pathelement location="${josm}"/>
@@ -124,5 +128,5 @@
         <javac srcdir="${plugin.src.dir}" debug="true" destdir="${plugin.build.dir}" includeantruntime="false"
             encoding="UTF-8" target="${java.lang.version}" source="${java.lang.version}" fork="yes">
-            <compilerarg value="-J-Xbootclasspath/p:${error_prone_javac.jar}" unless:set="isJava9"/>
+            <compilerarg value="-J-Xbootclasspath/p:${toString:jdk8.boot.classpath}" unless:set="isJava9"/>
             <compilerarg line="-XDcompilePolicy=simple"/>
             <compilerarg value="-processorpath"/>