apacheGH-39170: [Java] Improve error message explaining why TestTls m…

…ight fail
jbonofre · Dec 11, 2023 · dc5a99f · dc5a99f
1 parent 92e56ba
commit dc5a99f
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/java/flight/flight-core/src/test/java/org/apache/arrow/flight/FlightTestUtil.java b/java/flight/flight-core/src/test/java/org/apache/arrow/flight/FlightTestUtil.java
@@ -19,6 +19,7 @@
 
 import java.io.File;
 import java.lang.reflect.InvocationTargetException;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Arrays;
 import java.util.List;
@@ -47,7 +48,11 @@ static Path exampleTlsRootCert() {
 
   static List<CertKeyPair> exampleTlsCerts() {
     final Path root = getFlightTestDataRoot();
-    return Arrays.asList(new CertKeyPair(root.resolve("cert0.pem").toFile(), root.resolve("cert0.pkcs1").toFile()),
+    final Path cert0Pem = root.resolve("cert0.pem");
+    if (!Files.exists(cert0Pem)) {
+      throw new RuntimeException(cert0Pem + " doesn't exist. Make sure submodules are initialized (see https://arrow.apache.org/docs/dev/developers/java/building.html#building)");
+    }
+    return Arrays.asList(new CertKeyPair(cert0Pem.toFile(), root.resolve("cert0.pkcs1").toFile()),
         new CertKeyPair(root.resolve("cert1.pem").toFile(), root.resolve("cert1.pkcs1").toFile()));
   }