diff --git a/src/hotspot/os/posix/os_posix.cpp b/src/hotspot/os/posix/os_posix.cpp
index 1a82cd7f865..40f160623bf 100644
--- a/src/hotspot/os/posix/os_posix.cpp
+++ b/src/hotspot/os/posix/os_posix.cpp
@@ -722,7 +722,16 @@ void* os::get_default_process_handle() {
 }
 
 void* os::dll_lookup(void* handle, const char* name) {
-  return dlsym(handle, name);
+  ::dlerror(); // Clear any previous error
+  void* ret = ::dlsym(handle, name);
+  if (ret == nullptr) {
+    const char* tmp = ::dlerror();
+    // It is possible that we found a NULL symbol, hence no error.
+    if (tmp != nullptr) {
+      log_debug(os)("Symbol %s not found in dll: %s", name, tmp);
+    }
+  }
+  return ret;
 }
 
 void os::dll_unload(void *lib) {
diff --git a/src/hotspot/os/windows/os_windows.cpp b/src/hotspot/os/windows/os_windows.cpp
index 23024aa60cc..ddc1b1c335d 100644
--- a/src/hotspot/os/windows/os_windows.cpp
+++ b/src/hotspot/os/windows/os_windows.cpp
@@ -1280,7 +1280,15 @@ void  os::dll_unload(void *lib) {
 }
 
 void* os::dll_lookup(void *lib, const char *name) {
-  return (void*)::GetProcAddress((HMODULE)lib, name);
+  ::SetLastError(0); // Clear old pending errors
+  void* ret = ::GetProcAddress((HMODULE)lib, name);
+  if (ret == nullptr) {
+    char buf[512];
+    if (os::lasterror(buf, sizeof(buf)) > 0) {
+      log_debug(os)("Symbol %s not found in dll: %s", name, buf);
+    }
+  }
+  return ret;
 }
 
 // Directory routines copied from src/win32/native/java/io/dirent_md.c