Print error information when we fail to load LDK native library

diff --git a/java_strings.py b/java_strings.py
index 2ddecab7539aed909fc8f544515f4ec3497e1a0a..1f4ddaff009dfcf940632e9046082d18f5a7c8d6 100644 (file)
--- a/java_strings.py
+++ b/java_strings.py
@@ -44,7 +44,7 @@ public class bindings {
                try {
                        // Try to load natively first, this works on Android and in testing.
                        System.loadLibrary(\"lightningjni\");
-               } catch (UnsatisfiedLinkError _ignored) {
+               } catch (UnsatisfiedLinkError system_load_err) {
                        // Otherwise try to load from the library jar.
                        File tmpdir = new File(System.getProperty("java.io.tmpdir"), "ldk-java-nativelib");
                        tmpdir.mkdir(); // If it fails to create, assume it was there already
@@ -56,6 +56,9 @@ public class bindings {
                                Files.copy(is, libpath, StandardCopyOption.REPLACE_EXISTING);
                                Runtime.getRuntime().load(libpath.toString());
                        } catch (IOException e) {
+                               System.err.println("Failed to load LDK native library.");
+                               System.err.println("System LDK native library load failed with: " + system_load_err);
+                               System.err.println("Resource-based LDK native library load failed with: " + e);
                                throw new IllegalArgumentException(e);
                        }
                }