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Berkeley DB Java Edition ( JE ) is a pure Java database.

Its design resembles that of Berkeley DB without replicating it exactly, and has a feature set that includes many of those found in the traditional Berkeley DB and others that are specific to the Java Edition.

Since it is written in pure Java, no native code is required.

It has a log structured storage architecture, which gives it different performance and concurrency characteristics.

Three APIs are available — a Direct Persistence Layer which is " Plain Old Java Objects " ( POJO ); one which is based on the Java Collections Framework ( an object persistence approach ); and one based on the traditional Berkeley DB API.

The Berkeley DB Java Edition High Availability option ( Replication ) is available.

Note that traditional Berkeley DB also supports a Java API, but it does so via JNI and thus requires an installed native library.