--- title: Java slug: v4-8/release-notes/java icon: {"faIcon":"fa-brands fa-java"} docTags: createdAt: 2024-03-07T16:13:11.599Z --- ![](https://api.archbee.com/api/optimize/qoRkNxW5fJ81r_NqVpc8C/LOE5MwNiOS5-oJxHOHIYd_java-ditto-icon-card-light-mode.png) # 4.8.3 Version Release *Release Date: *Dec 18, 2024** ## 4.8.3 Common Release Notes 🛠️ **Fixed:** iOS 18 crashes related to Bluetooth LE are now resolved. (#15351) 🔄 **Changed: **Added more actionable information to common connection handshake issues. (#15298) # 4.8.2 Version Release *Release Date: *Sept 25, 2024** ## 4.8.2 Kotlin/Java Specific Changes **🛠️ Fixed:** crash on WiFi Aware stalling and Ditto being re-created (#14423) **🛠️ Fixed:** crash on Android after logout (#14562) ## 4.8.2 Common Changes 🛠️ **Fixed:** Setting the minimum log level to WARN or ERROR will now correctly filter out very early logger initialization messages. (#14451) 🛠️ **Fixed:** A bug that could prevent an attachment created with the same data on multiple peers from syncing. (#14481) # 4.8.1 Version Release *Release Date: *Sept 5, 2024** ## 4.8.1 Kotlin/Java Specific Changes 🛠️ **Fixed:** Crash in WiFi Aware when registering network publisher callback (#14013) ## 4.8.1 Common Changes **➕ Added:** The `presence_use_multihop` system parameter can be used to disable replicating presence information to other peers in the mesh, reducing network overhead. Use **ONLY** with guidance from the Ditto Customer Experience team. (#14128) 🔄 **Changed: **When failing to load document data sync (replication) metadata, Ditto now attempts to clear and regenerate the metadata. This is a behavior change where previously Ditto would fail to start. This serves to prevent problems after SDK version downgrades. (#13111) **🛠️ Fixed: **A rare issue where attachments may not be transferred between two peers.(#14158) **🛠️ Fixed: **On-disk logs are more robust in situations with unexpected Ditto shutdown. (#13723) # 4.8.0 Version Release *Release Date: *Aug 28, 2024** The version 4.8.0 SDK release update brings a substantial number of improvements and new features designed to enhance your development experience and provide even more powerful tools for building robust, real-time applications. ## 4.8.0 Kotlin/Java Specific Changes **⭐️ **➕** Added:** Method `exportToFile()` to `DittoLogger`, which exports collected logs to a compressed and JSON-encoded file on the local file system. Logs returned through this method are at DEBUG log level. This new API can be used to do forensic log gathering on a device. Logs are always collected and restricted to a fixed specific size limit to ensure they don't grow endlessly. Once the size limit has reached new logs replace the oldest logs. #11961 ➕** Added:** Synchronous method `exportToFileBlocking()` to `DittoLogger` for Java callers. ➕** Added:** A new getter and setter for `Presence.connectionRequestHandler` which take a `DittoConnectionRequestHandlerCallback`, making the API much easier to call from Java. #12770 ➕ **Added:** Properties `peerKeyString1` and `peerKeyString2` on `DittoConnection` replacing the deprecated properties `peer1` and `peer2`  #12799 ➕ **Added:** Documentation for `startSync()` and `disableSyncWithV3()` to include a recommendation for performance improvement. #13098 :::BlockQuote Performance of initial sync when bootstrapping a new peer can be improved by calling `disableSyncWithV3()` before calling `startSync()`. Only do this when all peers in the mesh are known to be running Ditto v4 or higher. ::: ➕ **Added:** Documentation for property `peerMetadata` on `DittoPeer` to add information about how the property behaves over the lifecycle of the `DittoPresenceGraph` #13479 ➕ **Added:** optional hint parameter to `upsert()` on `DittoCollection` and `DittoScopedWriteTransaction`. By providing a hint you can better track the source of blocked write transactions #7110 ⭐️ 🔄 **Changed** Android Wifi Aware internal logic to avoid duplicate attempts to create the network and speed up time to successful connection #12458 ⭐️ 🔄 **Changed:** Improve Android WifiAware stability by actively terminate when the application goes into the background and resume when the application comes back to the foreground #12804 ⭐️ 🔄 **Changed:** Improve staleness detection in Android Wifi Aware leading to a more reliable connection. #12866 🔄 **Changed:** API docs no longer include unintentially exposed protected members. #13200 🔄 **Changed: **(Linux\&Android) Increased mDNS multicast TTL from 1 to 255 to allow for cross-VLAN announcements #13590 🔄 **Changed:** Slow or blocked write transactions now log hints showing the waiting and blocking transactions #7110 **🛠️ Fixed:** The SDK will no longer crash when it observes malformed mDNS traffic #12396 **🛠️ Fixed:** The SDK will no longer crash when multiple threads call `stopSync()` #11554 ⚠️ **Deprecated: **Properties `peer1` and `peer2` on `DittoConnection`, please use `peerKeyString1` and `peerKeyString2` instead #12799 ⚠️ **Deprecated: **Property `queryOverlapGroup` on `DittoPeer` and `DittoRemotePeerV2`, always return 0 going forward. Query Overlap Groups was an experiemental feature that has been removed after it was determined this would not support production scenarios. #13215 **❗️🗑️ Removed:** `delete()`, `swigReleaseOwnership()` and `swigTakeOwnership()` methods from `DittoLogger`. These are internal memory management APIs that were unintentially exposed and can cause memory leaks or crashes if used #12617 ❗️🗑️ **Removed** (**Experimental**)**:** property `queryOverlapGroup` of `DittoExperimental` ❗️🗑️ **Removed** (**Experimental**)**: **method `setPriorityForQueryOverlapGroup()` from `DittoExperimental`. #13215 ❗️🗑️ **Removed:** **(Experimental)** deprecated methods `setQueryOverlapGroup(queryOverlapGroup:)` and `setPriority(_:forQueryOverlapGroup:ditto:)` of `DittoExperimental` ## 4.8.0 Common Changes ❗️🔄 **Changed:** The Logging output format for Ditto SDKs has been changed in 4.8.0 as part of our process to improve readablility and observability across the Ditto platform. Customers should validate the new data format in their existing data ingestion pipelines. ***New Logging Schema:*** :::BlockQuote YYYY-MM-DDTHH\:MM\:SS.ssssss LEVEL TARGET: MESSAGE \{field1=value1, field2=value2, ...} ::: - **Timestamp (YYYY-MM-DDTHH\:MM.ssssss):** - **Format:** ISO 8601 format (e.g., 2024-08-16T14:23:05.123456Z). - **Description:** The exact time when the log entry was generated. - **Log Level (LEVEL):** - **Format:** One of the following levels— DEBUG, INFO, WARNING, ERROR. - **Description:** Indicates the severity or importance of the log entry. - **Target (TARGET):** - **Format:** A string, representing the internal module/area - **Description:** The source of the log entry, often corresponding to the internal module where the error was called. (e.g. `ditto_init` or `peer_event_listener`) - **Message (MESSAGE):** - **Format:** A human-readable string. - **Description:** The main content of the log entry. - **Structured Fields (\{field1=value1, field2=value2, ...}):** - **Format:** A list of key-value pairs enclosed in curly braces. - **Description:** Any additional structured data associated with the log entry. These fields can include custom data that you attach to the log entry using the tracing\::info!(field1 = value1, "Message") syntax. ***4.7 and earlier Logging Format Example*** :::BlockQuote \[INFO] 2024-08-02T10:25:39.981Z: AuthClient: using cached SiteId; site\_id = 16248337916605943930 ::: ***4.8.0 and later Logging Format Example*** :::BlockQuote 2024-08-02T11:32:25.905562+01:00 INFO ditto\_init\:new\_auth\_client: ditto\_auth: using cached SiteId site\_id=16248337916605943930 ::: ⭐️ ➕ **Added:** DQL support for string functions `byte_length` and `char_length` #12147 ⭐️ ➕ **Added:** DQL support for inline object and array literal creation #12312 ⭐️ ➕ **Added:** `object_length` and `deserialize_json` functions in DQL #12605 ⭐️ ➕ **Added:** DQL INSERT statements support inlining the construction of an object #12761 ➕ **Added:** Remote query capability allows Big Peer to execute read-only queries on Small Peers. Usagne currently internal to Ditto Customer Experience team members #12268 ➕ **Added:** Diagnostics are now provided when collecting Small Peer Info on-disk logs #12080 ➕ **Added:** output version, sdk and build information on startup for easier debugging #12845 ➕ **Added:** Introduced new internal capabilities ensure a large data payload (e.g. a large attachment file) cannot use all the bandwidth and prevent other data from being synced. ➕** Added:** mDNS transport can now be configured with a static port for the TCP server using the `tcp_server_bind_mdns_server_port` system parameter #13442 ⭐️ 🔄 **Changed:** New logging format that includes detailed information #10794 ⭐️ 🔄 **Changed:** The Ditto logger is now more verbose by default, with a minimum log level of `INFO` instead of `WARNING` #11141 ⭐️ 🔄 **Changed:** small peer info collection is now enabled by default and its default sync scope is now BigPeerOnly #12709 (Device dashboard will populate information automatically) ❗️🔄 **Changed:** (**Experimental**) Multihop connections are formed more efficiently, e.g., for Ditto Bus. This is an incompatible protocol change from previous versions #12108, #12623 🔄 **Changed:** Improve performance by avoiding deserializing the entire Document if only part of it is required #10887 🔄 **Changed:** Attachments now sync independently of documents, improving rainbow connection efficiency #11156 🔄 **Changed:** Updating several depdencies for security patching (Patch multiple old packages #12087) 🔄 **Changed:** How network OS capabilities are internally linked into the library to allow for more relaiable and reusable internal logic #12362 🔄 **Changed:** API documentation for `execute` method to include information about its interaction with sync subscriptions #12365 🔄 **Changed:** Default to creating backup Bluetooth connections when there is an existing WiFi connection (Default mesh\_chooser\_avoid\_redundant\_bluetooth to false #13398) 🔄 **Changed:** console logging will now output to STDERR instead of STDOUT (\[logs] logging now outputs to STDERR instead of STDOUT #13477) 🛠️ **Fixed: **Bytes and Arrays not being always comparable in the legacy query language #10887 🛠️ **Fixed:** Legacy query language casting counters and maps with tombstones to the wrong boolean value #10887 **🛠️ Fixed:** Lowered the log level of a few SQLite3 notices that were being unnecessarily logged as warnings #12032 **🛠️ Fixed:** A crash that can occur if a DQL query contains a multi-byte character #12324 **🛠️ Fixed:** An issue with the transports multiplexer that could lead to a hung process. This occured when dealing with large messages spanning multiple chunks (>64KB)  #12428 **🛠️ Fixed:** A rare edge case that could slow down data sync betten peers #12527 **🛠️ Fixed:** Frequent subscription changes along with eviction calls could cause failure to converge on data leading to inconsistent data state #11431 **🛠️ Fixed:** Memory leak in third party library used for peer-internal messaging #12895 **🛠️ Fixed:** Transport inactive connection tracking no longer stores identifiers indefinitely. This could lead to a slow growth in memory consumption for long lived applications (\~ 1MB/day on transports with high rate, unreliable discovery - such as BLE) #13147 **🛠️ Fixed:** Unexpected failures to obtain a certificate for peer-to-peer sync are now logged at `ERROR` level instead of `WARNING` #13323 ❗️🗑️ **Removed:** (**Experimental**) Ditto no longer supports the experimental Query Overlap Groups feature and support has been removed. This experimental feature has been removed after running a determining a lack of feasability in production scenarios. The team is iterating and plan on interoducing improved capabilitites. #13075