Apache Click

Friday February 12, 2010

Apache Click becomes a Top-Level Project and v2.1.0 now available

Apache Click has become a new Apache Top Level Project (TLP), signifying that Click is a well-governed project under the Apache Software Foundation principles.

Furthermore Click 2.1.0 has been released sporting many new features, including support for Google App Engine, a free Java hosting environment from Google.

New features and improvements:
  • Added support for Google App Engine, a free Java hosting environment from Google. This provides an ideal environment for students and startups to easily host their Click applications online. See GoogleAppEngineListener for details [560].
  • Added support for an in-memory File Upload Service that can be used for uploading files in a Google App Engine environment.
  • Added support for templates with custom extensions through the new ConfigService.isTemplate method. The default ConfigService implementation, XmlConfigService, provides support for the extensions .htm and .jsp, but new extensions can be provided in a subclass. See the JavaDoc for details [568].
  • Added support to the Page class for conditionally including Control head elements through the new method includeControlHeadElements [571].
  • Added support to deploy resources inside JARs from the Servlet 3.0 compliant location, META-INF/resources. Click's own pre-packaged resources are now also located in the JAR under META-INF/resources [570].
  • Added new Calendar popup to DateField. This Calendar popup uses Calendar Date Select which is based on the Prototype JavaScript library.

    Please note if you don't want a dependency on the Prototype library you can use the third-party Click Calendar instead.

  • Added first class support for HEAD elements such as JavaScript and Css. The following classes were added: Element, ResourceElement, JsImport, JsScript, CssImport and CssStyle. A new method was added to Page and Control: Control.getHeadElements() and Page.getHeadElements() [501].
  • Added SubmitLink control that can submit a Form [519].
  • Added HiddenList control for rendering and submitting a list of hidden fields [491].
  • Added pluggable security access controller (AccessController) to Menu class. This pluggable interface enable use of security frameworks such as Spring Security (Acegi) or JSecurity to control user access to Menu items. This issue was raised by Demetrios Kyriakis [406].
  • Added an Ant task, called DeployTask, for deploying static resources at build time. This task is useful when deploying Click applications in restricted environments. For more details see the section: deploying resources in a restricted environment.
  • Added a ResourceService, for serving static resources at runtime. This service is useful when deploying Click applications in restricted environments. For more details see the section: deploying resources in a restricted environment [564].
  • Added method, ClickUtils.createTemplateModel, which returns a template model containing objects such as the Context path, Page path, HTTP request, HTTP response, HTTP session etc.
  • Added ability to specify a custom TreeNode icon through the new method TreeNode.setIcon(String). This issue was raised and fixed by Tim Hooper [494].
  • Added method Format.url for encoding URL's in templates [399].
  • Added method FieldColumn.setProperty that can be overriden to provide custom binding for complex domain objects. This issue was raised and fixed by WarnerJan Veldhuis [528].
  • Added TypeConverter configuration option to ClickServlet. See getTypeConverter() method for details. This issue was raised Joseph Schmidt and fixed by Adrian A. [539].
  • Added Slf4jLogService for supporting multiple application servers. This issue was raised Oliver Burn [555].
  • Added @Bindable annotation support for page field autobinding. @Bindable supports public, protected and private Page variables [556, 599 ].
  • Added property files with translation for the Russian language. This issue was raised and fixed by Andrey Rybin [607], [611].
  • Added new Tree methods setWidth / getWidth and setHeight / getHeight. Also fixed rendering issues in IE6/7 for long node labels that overflow the tree width [616].
  • The click.dtd has been published to http://click.apache.org/dtds/click-2.1.dtd.
  • If you want your configuration to conform to the click.dtd, include the following declaration in your click.xml:
    <!DOCTYPE click-app PUBLIC "-//Apache Software Foundation//DTD Click Configuration 2.1//EN"
    "http://click.apache.org/dtds/click_2_1.dtd">
  • Improved Form validation to allow Form subclasses to override the validate method and implement cross-field validation. The following changes were made: the previous validate method was renamed to validateFileUpload and a new empty validate method was introduced, that can safely be overridden in subclasses [572].
  • Improved Page redirect to support parameters. See the new Page methods setRedirect(String, Map) and setRedirect(Class, Map) This issue was raised and fixed by Adrian [536].
  • Improved Link Controls to support multivalued parameters through the new AbstractLink methods getParameterValues() and setParameterValues() [554].
  • Improved Table to support very large datasets by promoting the methods getFirstRow() and getLastRow() as public. These methods provide the necessary information to only retrieve the displayed rows [504].
  • Improved LinkDecorator to support target identfier property parameter names. This issue was raised by Demetrios Kyriakis and fixed by fixed by Adrian A. [400].
  • Improved PickList methods getValueObject() and setValueObject(Object) to delegate to getSelectedValues() and addSelectedValue(String) respectively [490].
  • Improved Spring integration with SpringClickServlet and PageScopeResolver, supporting Spring instantiated Pages with @Component configuration [534].
  • Improved CompressionServletResponseWrapper and CompressionResponseStream classes to have public visibility to enable use in custom servlet Filters [547].
  • Improved Menu control to render attribute class="selected" when the menu item is selected. This issue was raised and fixed by Frederic Daoud [551].
  • Improved PerformanceFilter to implement exclude-paths filtering [498].
  • Improved XmlConfigService to scan for deployable resources inside folders on the classpath [552].
  • Improved Cayenne DataContextFilter, including adding support for LifecycleListener registration [559].
  • Improved AbstractLink to allow rendering of both icon and label in Link controls (default behavior renders either a label or an icon) [535].
  • Improved Page and Control message handling with null args. This issue was raised by WarnerJan Veldhuis [600].
  • Fixed resource deployment on JBoss 5 and up. The solution is based on the work done by the Stripes Framework developers [589].

Deprecated:

Updated third-party libraries:
  • Update Velocity library to version 1.6.3.
  • Update Cayenne library to version 3.0M6.
  • Update Prototype.js library to version 1.6.1.

New Documentation:
  • Documentation has been converted to Docbook and are made available in three different flavors: PDF, HTML (single page) and HTML (multiple pages). Thanks to Gilberto C Andrade for doing the conversion [482].
  • Added a new section, Deploying resources in a restricted environment, describing how to deploy static resources in environments where WAR/EAR are not unpacked or where file system permissions are restricted, such as Google App Engine.
  • Added documentation describing the new HEAD element support. Please see the new section on Page HEAD elements and the section on Control HEAD elements.

New examples:
Enjoy.

- The Click team

Comments:

Hi, I tested this version in Google App Engine. I have made all modifications mentioned in GoogleAppEngineListener javadoc page. But still, when I run the sample Date example in Google App Engine local development environment I get the following error: [java] java.lang.NoClassDefFoundError: java.io.FileOutputStream is a restricted class. Please see the Google App Engine developer's guide for more details. Is there something else I should do to get this running?

Posted by Anoop on March 01, 2010 at 05:57 AM EST #

Hi Anoop, can you post the stackTrace here? Will help determine where the FileOutputStream is being referenced from.

Posted by 127.0.0.1 on March 01, 2010 at 06:02 AM EST #

Hi, I have uploaded the error log. You can see it here: http://pastebin.com/7eSJj9ME

Posted by Anoop on March 05, 2010 at 12:05 PM EST #

Hi, click do not see static resources from jar (/click/table_2.3.0.css, /click/component.css) on GAE How to decide it problem?

Posted by andrei on May 15, 2011 at 01:09 PM EST #

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