{"record":{"id":"672a546c79f5cf40","repo":"OtterMind/Chat2DB","slug":"ai-chat-history-deletemessagesfailed","errorCode":"ai.chat.history.deleteMessagesFailed","errorMessage":"ai.chat.history.deleteMessagesFailed","messagePattern":"ai\\.chat\\.history\\.deleteMessagesFailed","errorType":"exception","errorClass":"BusinessException","httpStatus":null,"severity":"error","filePath":"chat2db-community-server/chat2db-community-domain/chat2db-community-domain-core/src/main/java/ai/chat2db/community/domain/core/impl/ai/AiChatHistoryServiceImpl.java","lineNumber":182,"sourceCode":"        }\n        return all.subList(all.size() - maxMessages, all.size());\n    }\n\n    private synchronized void deleteSessionLocal(String sessionId, Long userId) {\n        List<AiChatSession> sessions = loadSessions(userId);\n        // Only delete the message file when the session was actually owned by\n        // this user; otherwise a caller could delete another user's file by id.\n        boolean removed = sessions.removeIf(s -> Objects.equals(s.getId(), sessionId));\n        persistSessions(userId, sessions);\n        if (!removed) {\n            return;\n        }\n\n        Path msgFile = messagesPath(sessionId);\n        try {\n            Files.deleteIfExists(msgFile);\n        } catch (IOException e) {\n            throw new BusinessException(\"ai.chat.history.deleteMessagesFailed\", new Object[]{msgFile, e.getMessage()}, e);\n        }\n    }\n\n    private Path sessionsPath(Long userId) {\n        return baseDir.resolve(\"sessions-\" + userId + \".json\");\n    }\n\n    private Path messagesPath(String sessionId) {\n        return baseDir.resolve(sessionId + \".json\");\n    }\n\n    private List<AiChatSession> loadSessions(Long userId) {\n        Path path = sessionsPath(userId);\n        if (!Files.exists(path)) {\n            return new ArrayList<>();\n        }\n        try {\n            SessionsFile file = objectMapper.readValue(path.toFile(), SessionsFile.class);","sourceCodeStart":164,"sourceCodeEnd":200,"githubUrl":"https://github.com/OtterMind/Chat2DB/blob/5ee1e990e73fbcae1969dc554be254fedb3ab888/chat2db-community-server/chat2db-community-domain/chat2db-community-domain-core/src/main/java/ai/chat2db/community/domain/core/impl/ai/AiChatHistoryServiceImpl.java#L164-L200","documentation":"Thrown by AiChatHistoryServiceImpl when Files.deleteIfExists(msgFile) raises IOException while deleting a session's messages JSON file. Args are {msgFile, e.getMessage()}. It only attempts deletion after the session was confirmed owned and removed from the sessions list. The i18n key is defined; resolves to the raw code if absent.","triggerScenarios":"Deleting a session whose <sessionId>.json message file cannot be removed: permission denied on the file, the file is locked by another process (antivirus/indexer on Windows), or the filesystem is read-only. The sessions list is already updated, so the session disappears but its message file lingers.","commonSituations":"Running on a read-only or permission-restricted storage mount; an antivirus holding a lock on Windows; the ai-chat-history dir has wrong ownership; container volume mounted read-only.","solutions":["Check filesystem permissions on <basePath>/ai-chat-history/ (ConfigUtils.getBasePath()/ai-chat-history) and ensure the process user owns it.","Retry once after a short delay if a transient lock is likely (Windows AV), since deleteIfExists is idempotent.","On a read-only volume, remount rw or relocate chat2db.base.path to a writable directory.","Note the sessions list is already persisted without the session; orphaned <sessionId>.json can be swept on startup."],"exampleFix":"// before: single attempt throws on transient lock\nFiles.deleteIfExists(msgFile);\n\n// after: tolerate transient lock then mark for sweep\ntry {\n    Files.deleteIfExists(msgFile);\n} catch (IOException e) {\n    orphanSweeper.mark(msgFile); // clean on next startup\n    log.warn(\"could not delete {} now, scheduled for sweep\", msgFile);\n}","handlingStrategy":"try-catch","validationCode":"Path dir = Paths.get(ConfigUtils.getBasePath(), \"ai-chat-history\");\nif (!Files.isWritable(dir)) {\n    throw new IllegalStateException(\"ai-chat-history not writable: \" + dir);\n}","typeGuard":null,"tryCatchPattern":"try {\n    history.deleteSession(userId, sessionId);\n} catch (BusinessException e) {\n    if (\"ai.chat.history.deleteMessagesFailed\".equals(e.getCode())) {\n        // session already removed from list; orphan file can be swept later\n        orphanSweeper.mark((Path) e.getArgs()[0]);\n    }\n}","preventionTips":["Ensure the process user owns and can write/delete in the ai-chat-history dir.","On Windows, exclude the data dir from AV locking.","Implement a startup orphan-file sweeper for files that failed to delete."],"tags":["ai","chat-history","filesystem","io","cleanup"],"backgroundTag":null,"analyzedSha":"5ee1e990e73fbcae1969dc554be254fedb3ab888","analyzedAt":"2026-08-14T07:05:03.077Z","schemaVersion":2},"datasetVersion":"2026-08-14T10:17:34.591Z"}