nothing wrong with setFailOnError(false) and spawn.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276162 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Java.java

@@ -405,9 +405,8 @@ public class Java extends Task {
      */
     public void setFailonerror(boolean fail) {
         failOnError = fail;
-        incompatibleWithSpawn = true;
+        incompatibleWithSpawn |= fail;
     }
-
     /**
      * The working directory of the process
      *