Java + Spark SQL prep steps should delete target dir on failure (#17360)

java/build.clj

 (ns build
-  (:require [clojure.tools.build.api :as b]))
+  (:require [clojure.pprint :as pprint]
+            [clojure.tools.build.api :as b]))
+
+(def target-dir "target/classes")
 
 (defn compile-java [_]
-  (b/javac
-   {:src-dirs   ["."]
-    :class-dir  "target/classes"
-    :basis      (b/create-basis {:aliases #{:compilation-basis}})
-    :javac-opts ["-source" "8", "-target" "8"]}))
+  (b/delete {:path target-dir})
+  (try
+    (b/javac
+     {:src-dirs   ["."]
+      :class-dir  target-dir
+      :basis      (b/create-basis {:aliases #{:compilation-basis}})
+      :javac-opts ["-source" "8", "-target" "8"]})
+    (catch Throwable e
+      (println "Error compiling Java sources:" (ex-message e))
+      (pprint/pprint (Throwable->map e))
+      (b/delete {:path target-dir})
+      (throw e))))

modules/drivers/sparksql/build.clj

@@ -2,15 +2,19 @@
   (:require [clojure.pprint :as pprint]
             [clojure.tools.build.api :as b]))
 
+(def target-dir "target/classes")
+
 (defn aot [_]
+  (b/delete {:path target-dir})
   (try
     (b/compile-clj
      {:src-dirs   ["src"]
-      :class-dir  "target/classes"
+      :class-dir  target-dir
       :basis      (b/create-basis {:aliases #{:compilation-basis}})
       :ns-compile '[metabase.driver.FixedHiveConnection
                     metabase.driver.FixedHiveDriver]})
     (catch Throwable e
       (println "Error AOT compiling Spark SQL namespaces:" (ex-message e))
       (pprint/pprint (Throwable->map e))
+      (b/delete {:path target-dir})
       (throw e))))