René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Empty lines after chunk throw UnifiedDiffParserException","articleBody":"**Description**\nEmpty lines after chunk line seem to crash the UnifiedDiffReader.parseUnifiedDiff() method.\n\n**To Reproduce**\nSteps to reproduce the behavior:\n1. Example data: \n```diff --git a/modules/configuration/gsrc/com/guidewire/pl/docexamples/DMSServlet.gs b/modules/configuration/gsrc/com/guidewire/pl/docexamples/DMSServlet.gs\nindex 9e852060c..649690b43 100644\n--- a/modules/configuration/gsrc/com/guidewire/pl/docexamples/DMSServlet.gs\n+++ b/modules/configuration/gsrc/com/guidewire/pl/docexamples/DMSServlet.gs\n@@ -37,6 +37,7 @@ class DMSServlet extends HttpServlet {\n \n   public static final var ATTRIB_DOC_PUBLICID_PARAM: String = \"Document.PublicID\"\n   public static final var ATTRIB_JOIN_TABLE_TYPE: String = \"JoinTable.Type\"\n+  //a test\n   public static final var ATTRIB_JOIN_TABLE_PROPERTY: String = \"JoinTable.JoinedProperty\"\n   public static final var ATTRIB_JOINED_PUBLICID: String = \"Joined.PublicID\"\n   private var _purgeableUrl: String\ndiff --git a/testfile.txt b/testfile.txt\nnew file mode 100644\nindex 000000000..0ccd05bf0\n--- /dev/null\n+++ b/testfile.txt\n@@ -0,0 +1 @@\n+file.test\n```\n2. Run `UnifiedDiffReader.parseUnifiedDiff(new ByteArrayInputStream(raw.getBytes(StandardCharsets.UTF_8)));`\n3. You will get:\n```Dec 16, 2025 7:25:12 PM com.github.difflib.unifieddiff.UnifiedDiffReader processLine\nWARNING:   \u003e\u003e\u003e no rule matched \ncom.github.difflib.unifieddiff.UnifiedDiffParserException: expected data line not found\n\tat com.github.difflib.unifieddiff.UnifiedDiffReader.parse(UnifiedDiffReader.java:145)\n\tat com.github.difflib.unifieddiff.UnifiedDiffReader.parseUnifiedDiff(UnifiedDiffReader.java:205)\n```\n because this line is empty:\n\n\u003cimg width=\"379\" height=\"61\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/b1164fac-a514-4f4c-8dbe-b4378d567b40\" /\u003e\n\n**Expected behavior**\nEmpty lines should not throw errors here according to my understanding.\n\n**System**\n - Java version 21\n - Version [e.g. 4.15 (latest)]\n","author":{"url":"https://github.com/MadnessIRL","@type":"Person","name":"MadnessIRL"},"datePublished":"2025-12-16T18:27:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/225/java-diff-utils/issues/225"}