diff -r 76df01fc4aa2 -r d4e5d65ba7cf java/alt2xml-lib-output/nbproject/build-impl.xml
--- a/java/alt2xml-lib-output/nbproject/build-impl.xml	Sun Oct 02 15:23:20 2016 +0200
+++ b/java/alt2xml-lib-output/nbproject/build-impl.xml	Sun Oct 02 18:20:38 2016 +0200
@@ -191,7 +191,12 @@
                 </not>
             </and>
         </condition>
-        <property name="javac.fork" value="${jdkBug6558476}"/>
+        <condition else="false" property="javac.fork">
+            <or>
+                <istrue value="${jdkBug6558476}"/>
+                <istrue value="${javac.external.vm}"/>
+            </or>
+        </condition>
         <property name="jar.index" value="false"/>
         <property name="jar.index.metainf" value="${jar.index}"/>
         <property name="copylibs.rebase" value="true"/>
@@ -217,6 +222,7 @@
         <condition else="" property="testng.debug.mode" value="-mixed">
             <istrue value="${junit+testng.available}"/>
         </condition>
+        <property name="java.failonerror" value="true"/>
     </target>
     <target name="-post-init">
         <!-- Empty placeholder for easier customization. -->
@@ -693,7 +699,7 @@
             <sequential>
                 <property environment="env"/>
                 <resolve name="profiler.current.path" value="${profiler.info.pathvar}"/>
-                <java classname="@{classname}" dir="${profiler.info.dir}" fork="true" jvm="${profiler.info.jvm}">
+                <java classname="@{classname}" dir="${profiler.info.dir}" failonerror="${java.failonerror}" fork="true" jvm="${profiler.info.jvm}">
                     <jvmarg line="${endorsed.classpath.cmd.line.arg}"/>
                     <jvmarg value="${profiler.info.jvmargs.agent}"/>
                     <jvmarg line="${profiler.info.jvmargs}"/>
@@ -768,7 +774,7 @@
             <attribute default="${debug.classpath}" name="classpath"/>
             <element name="customize" optional="true"/>
             <sequential>
-                <java classname="@{classname}" dir="${work.dir}" fork="true">
+                <java classname="@{classname}" dir="${work.dir}" failonerror="${java.failonerror}" fork="true">
                     <jvmarg line="${endorsed.classpath.cmd.line.arg}"/>
                     <jvmarg line="${debug-args-line}"/>
                     <jvmarg value="-Xrunjdwp:transport=${debug-transport},address=${jpda.address}"/>
@@ -795,7 +801,7 @@
             <attribute default="jvm" name="jvm"/>
             <element name="customize" optional="true"/>
             <sequential>
-                <java classname="@{classname}" dir="${work.dir}" fork="true">
+                <java classname="@{classname}" dir="${work.dir}" failonerror="${java.failonerror}" fork="true">
                     <jvmarg line="${endorsed.classpath.cmd.line.arg}"/>
                     <jvmarg value="-Dfile.encoding=${runtime.encoding}"/>
                     <redirector errorencoding="${runtime.encoding}" inputencoding="${runtime.encoding}" outputencoding="${runtime.encoding}"/>