Struts 2.0.0 is the first distribution of WebWork 2 as an Apache Struts product.
- If you are a Maven developer, you might want to get started using the Maven Archetype.
- Another quick-start entry point is the blank application. Rename and deploy the WAR as a starting point for your own development.
Key Snippets
Maven Artifact ID
<dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-core</artifactId> <version>2.0.0-SNAPSHOT</version> </dependency>
Struts Configuration DTD
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
Key Changes
Depending on whether you are coming from a WebWork 2 or Struts 1 background, your perspective on the key changes will differ.
From WebWork 2
- Struts 2 is dependant on XWork 2 (nightly build).
- Java 1.5 is required to build and deploy Struts 2.
- For Java 1.4 deployments, RetroWeaver or RetroTranslater may be used to provide Java 1.4 support
- A pre-packaged set of RetroTranslator JARs are being provided with the distribution.
For other changes from WebWork 2, see the "Members to rename", "New property settings", "New members or feature changes", and "Removed or deprecated".
Members to rename
WebWork 2 |
Struts 2 |
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com.opensymphony.webwork.* |
org.apache.struts2.* |
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DispatcherUtil |
Dispatcher |
com.opensymphony.webwork.config.Configuration |
org.apache.struts2.config.Settings |
The tag prefix conventions in the example applications have changed.
JSP |
s: |
<s:form ...> |
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Freemarker |
s. |
<@s.form ...> |
Velocity |
s |
#sform ( ... ) |
New property settings
struts.enable.DynamicMethodInvocation |
Enable support for the |
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New members or feature changes
- Datepicker tag is now using dojo's (limited in terms functionality and internationalization)
- Various changes to ConfigurationManager
- ConfigurationManager is no longer a static factory. It is now an instance created through Dispatcher. Custom configuration could be done through DispatcherListener.
- Custom configuration to ConfigurationManager and Configuration cannot be done statically anymore, instead use Dispatcher's DispatcherListener to achieve the same effect.
- The
prepare
interceptor now uses reflection to call prepare_Method_ where method is the action method configured for the particular action instruts.xml
.<action name="myAction" method="insert" ....> ..... </action> // with the above configuration, and PrepareInterceptor in play, // callsequence will be 1] prepareInsert() (If it exists) 2] prepare() (Unless Interceptor's alwaysInvokePrepare parameter is set to false) 3] insert()
- DefaultWorkflowInterceptor (named
workflow
instruts-default.xml
) now uses reflection to callvalidateMethod
on the action class that implements Validateable interface wheremethod
is the action method configured for the particular action instruts.xml
.<action name="myAction" method="insert" ...> ... </action> // with the above configuration, and DefaultWorkflowInterceptor in play, // call sequence for action that implements Validateable interface will be 1] validateInsert() 2] validate() (unless Interceptor's alwaysInvokeValidate parameter is set to false) 3] insert()
Removed or deprecated
AroundInterceptor |
The AroundInterceptor has been removed. If your application extends the AroundInterceptor, either import the class into your source code form WebWork 2 (pursuant to the Open Symphony License) and modify it to server as your own base class, or rewrite your interceptor. |
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Support for the "oldSyntax" is removed. |
Rich text editor tag |
Rich text editor tag has been removed (a possible replacement would be to use the textarea tag with theme="ajax", this will used dojo's rich text editor) <s:textarea theme="ajax" /> |
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The convention of trying a "do" form of an action method is not supported. <action name="..." method="submit"> ... </action> In WebWork,
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From Struts 1
- See http://confluence.twdata.org/display/WW/Comparing+Struts+1+and+2
- More notes to come ...