3.1.0, September 27, 2006
These release notes contain:
Berkeley DB Java Edition (JE) is a 100% pure Java implementation of Berkeley DB. It implements a transactional store model based on a B+Tree access method.
The documentation set for JE includes:
This is release 3.1.0 of Berkeley DB Java Edition, and the first release in the JE 3.1 line. This is the GA release of the Direct Persistence Layer, which is the Plain Old Java Object (POJO)-based persistent object model introduced in JE 3.0.11.
Key changes since version JE 3.0.12
are described below; the complete list of changes can also be found in the change log page.
Note: If you are using Mac OS X, please be aware of the following issue. Java version 1.4.2 on Mac OS X reports the wrong value for Runtime.maxMemory. JE calculates the default cache size as a percentage of maxMemory. Because of this, for Java 1.4.2 on Mac OS X only, JE will assume that the Java maxMemory value is 64 MB. With the default je.maxMemoryPercent configuration parameter (60%) the default JE cache size will be approximately 38 MB. This default is fixed -- it does not change if the Java memory size is different than 64 MB. To specify a different JE cache size, you must explicitly set the je.maxMemory configuration property. The je.maxMemory property can be specified in the je.properties file or by calling EnvironmentConfig.setCacheSize.
In this release, class evolution is implemented in the Direct Persistence Layer, which completes the functionality of the DPL package. Class evolution allows changing persistent classes and performing lazy or eager evolution of the persistent instance data. For more information please see the package specification for the com.sleepycat.persist.evolve package.
NOTE: If you have deployed a store using the JE 3.0.12 beta release,, before changing your persistent classes for the first time you must open and close your store using the JE 3.1 release. To do this, you can simply open and close your application as usual, or you can write a small conversion program that constructs an EntityStore and calls its close method. The critical points are:
See the change log for the complete and detailed description of all bug fixes.
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