Include underlying exception message in exception. Makes it simpler to debug

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@273195 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/junit/AggregateTransformer.java

@@ -182,7 +182,8 @@ public class AggregateTransformer {
             XalanExecutor executor = XalanExecutor.newInstance(this);
             executor.execute();
         } catch (Exception e){
-            throw new BuildException("Errors while applying transformations", e);
+            throw new BuildException("Errors while applying transformations: "
+                + e.getMessage(), e);
         }
         final long dt = System.currentTimeMillis() - t0;
         task.log("Transform time: " + dt + "ms");