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1. What is it?
2. User Guide
3. Articles about OVal
4. Projects using OVal
5. License

OVal is a pragmatic and extensible validation framework for any kind of Java objects (not only JavaBeans).Constraints can be declared with annotations (@NotNull,@MaxLength),POJOs or XML.

Custom constraints can be expressed as custom Java classes or by using scripting languages such asJavaScript,Groovy,BeanShell,OGNL orMVEL.

Besides field/property validation OVal implementsProgramming by Contract features by utilizingAspectJ based aspects or viaSpring AOP. This for example allows runtime validation of constructor/method arguments.

The user guide is availableUSERGUIDE.md

There exist some articles and blog entries talking about and/or referencing OVal:

• Wikipedia (DE): OVal (Framework)
  https://de.wikipedia.org/wiki/OVal_(Framework)[EnglishTranslation]

• GlueCoders' Spring Boot Guide: Validation of Request Models using OVal (2017)
  https://github.com/GlueCoders/springboot-guide-docs/blob/master/requestvalidation-oval.md

• A Constraint-Based Approach to Data Quality in Information Systems (2017)
  https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/198644/1/Thesis-DavidWeber.pdf

• How to integrate Oval validation with Spring 3 (2013)
  http://maheshjq.blogspot.com/2013/08/how-to-integrate-oval-validation-with.html

• OVal - validate your models quickly and effortlessly (2011)
  https://touk.pl/blog/2011/07/14/oval-validate-your-models-quickly-and-effortlessly/

• A Valid Point (2011)
  http://www.grinshpoon.com/pblog/2011/06/29/a-valid-point/

• Validaciones: Hibernate Validator vs OVal (2010)
  https://unpocodejava.com/2010/05/07/validaciones-hibernate-validator-vs-oval/[EnglishTranslation]

• Enkel validering av Java-objekter med OVal (2010)
  http://open.bekk.no/enkel-validering-av-java-objekter-med-oval

• Oval Validation Framework (2010)
  http://vathzala.blogspot.de/2010/03/oval-validation-framework.html

• OVal - Object Validation With POJO (2009)
  https://bitsofwizardry.wordpress.com/2009/04/14/oval-object-validation-with-pojo/

• Diseño por Contrato con OVal y Spring [Design by Contract with OVal and Spring] (2009)
  https://dosideas.com/noticias/java/562-diseno-por-contrato-con-oval-y-spring[EnglishTranslation]

• An Aspect-Oriented Infrastructure for Design by Contract in Java
  https://www.semanticscholar.org/paper/An-Aspect-Oriented-Infrastructure-for-Design-by-in-Agostinho/0afb0c0a025b3deb6bb8565ce966bc7ef02e01e5

• OVal Blog Entry Series at the "JEE, BPEL, SOA" blog (2008) \

  • JSR 303 and OVal ValidationFramework
  • OVal andprofiles
  • Spring Web Flow 1 piecemeal validation and OValintegration

• Pre and post condition validation with OVal as intruments of software architecture (2008)
  https://stigl.wordpress.com/2008/07/19/pre-and-post-condition-validation-with-oval-as-intruments-of-software-architecture/

• OVal: The simple validation framework for Java (2008)
  http://takezoe.blogspot.com/2008/03/oval-simple-validation-framework-for.html

• Validación Java: OVal, una joya escondida (2007)
  http://brigomp.blogspot.com/2007/09/hay-veces-que-los-frameworks-menos.html

• Die Pro-Pix Homepage - Design by Contract (2007)
  http://pro-pix.de/joomla/index.php?option=com_content&task=view&id=39&Itemid=1

• In pursuit of code quality: Defensive programming with AOP (2007)
  http://www.ibm.com/developerworks/library/j-cq01307/

• OVal e la validazione degli oggetti in Java (2006)
  http://www.keepintech.it/2006/12/22/oval-e-la-validazione-degli-oggetti-in-java/

• Limiting conditional complexity with AOP (2006)
  https://nofluffjuststuff.com/blog/paul_duvall/2006/12/limiting_conditional_complexity_with_aop

• Arena Persistencehttp://arena-pers.uqbar.org/
• Jadira Frameworkhttp://jadira.sourceforge.net/
• Omniproperties - a lightweight configuration utilityhttps://github.com/siemens/omniproperties
• fustewa - A full web stack based on Springhttps://github.com/opensource21/fuwesta
• eSciDochttps://www.escidoc.org/
• SaferJavahttp://code.google.com/p/saferjava/
• JProvocateurhttp://www.jprovocateur.org/
• NexOpenhttps://sourceforge.net/projects/nexopen/
• gdv.xporthttps://github.com/oboehm/gdv.xport
• suz-lab-gaehttp://code.google.com/p/suz-lab-gae/
• Cubby Simple Web Application Frameworkhttp://cubby.seasar.org/20x/cubby-oval/index.html
• Metawidgethttps://github.com/metawidget/metawidget
• Struts 2 OVal Plug-inhttp://cwiki.apache.org/confluence/display/S2PLUGINS/OVal+Plugin
• Play! Framework 1.xhttp://www.playframework.org/
• Cayenne annotationshttp://sourceforge.net/projects/cayannotations/
• jsfatworkhttp://code.google.com/p/jsfatwork/
• mtn4javahttp://www.mvnrepository.com/artifact/org.criticalsection.mtn4java/mtn4java/
• Polyformshttp://code.google.com/p/polyforms/
• rsserhttp://code.google.com/p/rsser/
• saetchttp://code.google.com/p/saetc/
• ultimate-roundtriphttp://code.google.com/p/ultimate-roundtrip/

All files are released under theEclipse Public License 2.0.