- Don't do 'mtn list changed' if not in a workspace or not needed

core/java/build.xml

@@ -39,7 +39,7 @@
         </javac>
     </target>
 
-    <target name="jar" depends="compile, jarUpToDate" unless="jar.uptodate" >
+    <target name="listChangedFiles" if="mtn.available" >
         <exec executable="mtn" outputproperty="workspace.changes" errorproperty="mtn.error2" failifexecutionfails="false" >
             <arg value="list" />
             <arg value="changed" />
@@ -51,6 +51,11 @@
             <arg value="[:space:]" />
             <arg value="," />
         </exec>
+    </target>
+
+    <target name="jar" depends="compile, jarUpToDate, listChangedFiles" unless="jar.uptodate" >
+        <!-- set if unset -->
+        <property name="workspace.changes.tr" value="" />
         <jar destfile="./build/i2p.jar" basedir="./build/obj" includes="**/*.class" >
             <manifest>
                 <attribute name="Build-Date" value="${build.timestamp}" />