[java] Improve screenshot error message

java/src/org/openqa/selenium/OutputType.java

@@ -83,14 +83,29 @@ public File convertFromPngBytes(byte[] data) {
         }
 
         private File save(byte[] data) {
+          Path tmpFilePath = createScreenshotFile();
           try {
-            Path tmpFilePath = Files.createTempFile("screenshot", ".png");
-            File tmpFile = tmpFilePath.toFile();
-            tmpFile.deleteOnExit();
             Files.write(tmpFilePath, data);
-            return tmpFile;
           } catch (IOException e) {
-            throw new WebDriverException(e);
+            throw new WebDriverException(
+                "Failed to create or write screenshot to temporary file: "
+                    + tmpFilePath.toAbsolutePath().toString(),
+                e);
+          }
+
+          File tmpFile = tmpFilePath.toFile();
+          tmpFile.deleteOnExit();
+          return tmpFile;
+        }
+
+        private Path createScreenshotFile() {
+          try {
+            return Files.createTempFile("screenshot", ".png");
+          } catch (IOException e) {
+            throw new WebDriverException(
+                "Failed to create or write screenshot to temporary file: "
+                    + "temporary file could not be created",
+                e);
           }
         }