Prevent usage of newer JDKs than JDK8 when building next version of nbjavac-15.0.0.x

Author: Jaroslav Tulach

make/langtools/netbeans/nb-javac/build.xml

@@ -67,6 +67,12 @@
 
     -->
 
+    <fail message="Please use JDK8 to build nb-javac!">
+        <condition>
+            <available classname="java.lang.Module"/>
+        </condition>
+    </fail>
+
     <!-- suppress javadoc generation for this library, as its wrappers do it -->
     <target name="-javadoc-build"/>
 

make/langtools/netbeans/nb-javac/nbproject/project.properties

@@ -104,4 +104,4 @@ javac.test.classpath=\
     ${build.dir}/lib/hamcrest-core-1.3.jar
 debug.classpath=${run.classpath}
 jnlp.enabled=false
-nb-javac-ver=15.0.0.1
+nb-javac-ver=15.0.0.2