Java API
ObjectBox is an an easy to use, object-oriented lightweight database and a full alternative to SQLite.
This is the ObjectBox documentation for our Java API. We strive to provide you with the easiest and fastest solution to store and retrieve data. Your feedback on ObjectBox and this documentation is very welcome. Use the "Was this page helpful?" smiley at the end of each page or send us your comments to contact[at]objectbox.io - thank you! :)
Fixed a bug introduced by V2.3.2 affecting older Android versions 4.3 and below
Potential work around for UnsatisfiedLinkError probably caused by installation errors mostly in alternative app markets
Fixed a corner case for Box.getAll() after removeAll() to return a stale object if no objects are stored
Query improvements: findIds and LazyList also consider the order; offset and limit for findIds
Improved 32 bit support: Windows 32 version officially deployed, fixed a corner case crash
Property queries for a boolean property now allow sum()
Added Box.isEmpty()
Supporting older Linux distributions (now starting at e.g. Ubuntu 16.04 instead of 18.04)
Fix for a corner case with Box.count() when using a maximum
Minor improvements to the ObjectBox code generator
Android: set extractNativeLibs to false to avoid issues with extracting the native library
Using @Unique for strings? Please update ASAP
Urgent fix: the unique check for string properties had false positives resulting in UniqueViolationException. This occurs only in combination with IndexType.HASH (the default) when hashes actually collide. We advise to update immediately to the newest version if you are using hashed indexes.
The release of new ObjectBox C API made us change name of the JNI library
for better distinction. This should not affect you unless you depended on that (internal) name.
Improved compatibility with class transformers like Jacoco
Fixed query links for M:N backlinks
Improved error messages for the build tools
The Object Browser AAR now includes the required Android permissions
Entity counts are now cached for better performance
Deprecated aggregate function were removed (deprecation in 1.4 with introduction of PropertyQuery)
Object browser hot fix: the hashed indexes introduced in 2.0 broke the object browser
Object browser fixes: filters with long ints, improved performance in the schema view
NPE fix in ToOne
Added a specific NonUniqueResultException if a query did not return an expected unique result
Links and relation completeness and other features already announced in the 2.0 beta
Unique constraint for properties via @Unique annotation
Hash index: for strings the new default index is hash-based, which is more space efficient
Support for char type (16 bit)
RX lib deployed in JCenter
Rework of Query APIs: type safe properties (property now knows its owning entity)
Allow query conditions of links using properties (without parameter alias)
Query performance improvements when using order
Property based count: query for non-null or unique occurrences of entity properties (non-null and unique)
Additional query conditions for strings: "greater than", "less than", "in"
Added query conditions for byte arrays
Set query parameters for "in" condition (int[] and long[])
Query across relation bounds using links (aka "join"): queries just got much more powerful. For example, query for orders that have a customer with an address on "Sesame Street". Or all persons, who have a grand parent called "Alice".
Backlinks for to-many relations: now ObjectBox is "relation complete" with a bi-directional many-to-many relation.
Query performance improvements: getting min/max values of indexed properties in constant time
Android: added Paging library support (architecture components)
Kotlin extensions: more Kotlin fun with ObjectBox KTX
Query parameters aliases: helps setting query parameters in complex scenarios (e.g. for properties of linked entities)
Improved query parameter verification
Many internal improvements to keep us going fast in the future