AR for Java; ActiveObjects is an intuitive, pure-Java ORM. AO is designed from the ground up to be extremely simple and easy to use from an API standpoint. AO can be used with either an existing database schema, or it can auto-generate the database schema from the user-specified entity interfaces. ActiveObjects also supports Rails-style database migrations, allowing incremental changes and refactoring of the database schema without data loss.AO can perform better than data mapper ORMs due to its natural use of lazy-loading coupled with sophisticated caching mechanisms. However, performance is not the primary design goal of the project. Rather, the intention is to create an ORM which is powerful and yet extremely natural to use and integrate into your project. This design has lead to certain performance benefits (such as lazy-loading), but on the whole, data mapper ORMs are inherently slightly more performant than AO
The goal of Autofetch is reduce the modularity penalty and programmer burden of specifying associations which should be loaded with an object query. These specifications are sometimes are called fetch profiles, prefetch directives, or joins. These specifications are an important performance optimization because they reduce the number of round-trips to a persistence store whether that be a relational database, object database, or flat file. Autofetch is a library which integrates with object persistence tools and automatically handles prefetching data. Using dynamic program profiling, Autofetch determines the right prefetch directives for each query a program executes.
What is Ebean?
Ebean is a Object Relational Mapping Persistence Layer written in Java (Open Source LGPL license).
* Providing the features of EJB3's JPA (and more)
* No container required
* JPA compatible ORM mapping (@Entity, @OneToMany, ...)
Why use Ebean?
Ebean provides a simpler approach to Object Relational Mapping. It does this by not requiring session objects such as JPA EntityManager, JDO PersistenceManager, Hibernate Session, Toplink ClientSession.
Java Bean Library (beanlib) is a utilities library for use with JavaBean. Java Bean Library for Hibernate (beanlib-hibernate) is particularly handy when used with Hibernate. It allows developers to easily reuse the same pojo classes for both persistence i
Cayenne is a powerful, full-featured Java Object Relational Mapping framework. It is open source and completely free. Cayenne cross-platform modeling GUI tools place it in the league of its own, making it a very attractive choice over both closed source c
CryoPID allows you to capture the state of a running process in Linux and save it to a file. This file can then be used to resume the process later on, either after a reboot or even on another machine. Status CryoPID was spawned out of a discussion on the Software suspend mailing list about the complexities of suspending and resuming individual processes. CryoPID consists of a program called freeze that captures the state of a running process and writes it into a file. The file is self-executing and self-extracting, so to resume a process, you simply run that file. See the table below for more details on what is supported. Features Current features are: * Can run as an ordinary user! (no root privileges needed) * Works on both 2.4 and 2.6. * Works on x86 and AMD64. * Can start & stop a process multiple times * Can migrate processes between machines and between kernel versions (tested between 2.4 to 2.6 and 2.6 to 2.4).
CSVObjects is a free and open source Java based framework for transparently parsing and unmarshalling Comma Separated Value (CSV) files and records into Plain Old Java Objects without the need to code the parsing logic manually.
The CSVObjects parsing library relies on declarative mapping of CSV fields and data types to Java Bean attributes, via a mapping XML file. This is similar to the manner in which Hibernate provides a relational table mapping for Java Beans.
Also, the framework provides convenience Xdoclet support for specifying the CSV to Java mapping in the Java source code itself by using Javadoc markup, thereby reducing the burden on the developer to manually maintain separate configuration files.
The Framework is built upon Stephen Ostermiller's excellent CSV reader/parser classes.
The DataNucleus project provides products for the management of application data in a Java environment. Our aim is to provide good quality open source products to handle data in all of its forms, wherever it is stored. This goes from persistence of data into heterogeneous datastores, to providing methods of retrieval using a range of query languages, and eventually on to the analysis of data and tools for managing data quality. Your use of DataNucleus products will mean that you don't need to take significant time in learning the oddities of particular datastores, or query languages and instead use a single common interface for all of your data, and instead your team can concentrate their application development time on adding business logic and let DataNucleus take care of data management issues.
As also described in the Hibernate book from King and Bauer: "With the adoption of Java™ 5 generics, the idea of a generic typesafe Data Access Object (DAO) implementation has become feasible. In this article, system architect Per Mellqvist presents a generic DAO implementation class based on Hibernate. He then shows you how to use Spring AOP introductions to add a typesafe interface to the class for query execution."