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Update Struts dependencies to 2.5.
Remove the following plugin dependencies because they were dropped and aren't supported anymore.
The org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter was moved to org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter.
In web.xml replace this:
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
with that:
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
There were other package changes, please read Version Notes 2.5 for more details.
Struts DTD was updated to 2.5 version.
In struts.xml replace 2.3 DTD version:
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
with 2.5:
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">
The id attribute was replaced with var attribute in the following tags.
<s:action><s:append><s:bean><s:date><s:generator><s:iterator><s:merge><s:number><s:set><s:sort><s:subset><s:text><s:url>
If you have something like that in your code:
<s:url id="url" action="login">
change it to:
<s:url var="url" action="login">
The <s:set> tag name attribute is replaced with var attribute.
From:
<s:set id="str1" value="'string1 value'" /> <s:set name="str2" value="'string2 value'" />
to:
<s:set var="str1" value="'string1 value'" /> <s:set var="str2" value="'string2 value'" />
Also escape attribute was renamed to escapeHtml attribute.
From:
<s:property escape="true" var="someProperty"/>
to:
<s:property escapeHtml="true" var="someProperty"/>
The <s:div> tag was dropped.
Replace <s:div> with plain HTML <div> tag.
If you have field names which starts with single lower case letter, for example:
private String sTrng;
public String getSTrng() {...}
public void setSTrng(String str) {...}
change accessors to getsTrng and setsTrng.
Or better yet, change field names to not contain single lower case letter:
private String strng;
public String getStrng() {...}
public void setStrng(String str) {...}
For additional info see WW-3909.
Depending on from which version of struts you upgrade and whether you used tiles-plugin or tiles3-plugin you may need to do different steps.
Struts 2.5 just provides a tiles-plugin which uses Tiles3. So support for Tiles2 has been dropped as well as the name tiles3-plugin.
Now the only maven dependency looks like this:
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-tiles-plugin</artifactId>
<version>${struts2.version}</version>
</dependency>
You may need to update DTD in your tiles.xml files to Tiles3:
<!DOCTYPE tiles-definitions PUBLIC
"-//Apache Software Foundation//DTD Tiles Configuration 3.0//EN"
"http://tiles.apache.org/dtds/tiles-config_3_0.dtd">
A Listener in web.xml is required. It is not necessary to configure paths to tiles.xml files here as they are picked up automatically.
<listener> <listener-class>org.apache.struts2.tiles.StrutsTilesListener</listener-class> </listener>
Optionally you may remove TilesDefinitions from XML and annotate actions instead. See Tiles Plugin for more details.