fix bad reference to modelgen.jar

Signed-off-by: Lukas Jungmann <lukas.jungmann@oracle.com>
diff --git a/jpa/eclipselink.jpa.test.jse/antbuild.xml b/jpa/eclipselink.jpa.test.jse/antbuild.xml
index ba8188c..7b837d1 100644
--- a/jpa/eclipselink.jpa.test.jse/antbuild.xml
+++ b/jpa/eclipselink.jpa.test.jse/antbuild.xml
@@ -22,12 +22,15 @@
     <property name="jse.el.plugins.dir"     value="${jse.el.root}/plugins"/>
     <property name="jse.jpa.plugins.dir"    value="${jse.jpa.root}/plugins"/>
 
+    <property name="version.qualifier"     value="qualifier"/>
+    <property name="version.string"        value="${release.version}.${version.qualifier}"/>
+
     <!-- Not sure if there is a better way to refer to dependencies? -->
     <property name="jse.eclipselink.jar" value="${jse.el.root}/eclipselink.jar"/>
     <property name="javax.transaction" value="${jse.el.plugins.dir}/javax.transaction_1.1.0.v201002051055.jar"/>
     <property name="javax.validation" value="${jse.el.plugins.dir}/javax.validation.api_2.0.1.Final.jar"/>
     <property name="javax.persistence" value="${jse.jpa.plugins.dir}/javax.persistence_2.2.0.v201708071007.jar"/>
-    <property name="jse.modelgen.jar" value="${jse.el.plugins.dir}/org.eclipse.persistence.jpa.modelgen_3.0.0.qualifier.jar"/>
+    <property name="jse.modelgen.jar" value="${jse.el.plugins.dir}/org.eclipse.persistence.jpa.modelgen_${version.string}.jar"/>
 
     <property environment="env" />
     <property file="${user.home}/build.properties"/>