lidavidm commented on code in PR #39171:
URL: https://github.com/apache/arrow/pull/39171#discussion_r1422564020


##########
java/flight/flight-core/src/test/java/org/apache/arrow/flight/FlightTestUtil.java:
##########
@@ -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. Take a look on 
https://arrow.apache.org/docs/dev/developers/java/building.html#building to 
initialize.");

Review Comment:
   ```suggestion
         throw new RuntimeException(cert0Pem + " doesn't exist. Make sure 
submodules are initialized (see 
https://arrow.apache.org/docs/dev/developers/java/building.html#building)");
   ```



##########
java/flight/flight-core/src/test/java/org/apache/arrow/flight/FlightTestUtil.java:
##########
@@ -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. Take a look on 
https://arrow.apache.org/docs/dev/developers/java/building.html#building to 
initialize.");

Review Comment:
   Something like this, in case the user already knows git?



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