Hi, I'm trying to get Velocity working on a struts application. This is what
I've dono so far:
1) Added to the project the velocity libraries (velocity-1.4.jar,
velocity-dep-1.4.jar and velocity-tools-1.3.jar)
2) Added this to my web.xml file:
<servlet>
<servlet-name>velocity</servlet-name>
<servlet-class>
org.apache.velocity.tools.view.servlet.VelocityViewServlet
</servlet-class>
<init-param>
<param-name>org.apache.velocity.toolbox</param-name>
<param-value>/WEB-INF/toolbox.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>velocity</servlet-name>
<url-pattern>*.vm</url-pattern>
</servlet-mapping>
3) Created the toolbox.xml file in WEB-INF dir with this content:
<?xml version="1.0"?>
<toolbox>
<tool>
<key>link</key>
<scope>request</scope>
<class>
org.apache.velocity.tools.struts.StrutsLinkTool
</class>
</tool>
<tool>
<key>msg</key>
<scope>request</scope>
<class>
org.apache.velocity.tools.struts.MessageTool
</class>
</tool>
<tool>
<key>errors</key>
<scope>request</scope>
<class>
org.apache.velocity.tools.struts.ErrorsTool
</class>
</tool>
<tool>
<key>form</key>
<scope>request</scope>
<class>
org.apache.velocity.tools.struts.FormTool
</class>
</tool>
<tool>
<key>tiles</key>
<scope>request</scope>
<class>
org.apache.velocity.tools.struts.TilesTool
</class>
</tool>
<tool>
<key>validator</key>
<scope>request</scope>
<class>
org.apache.velocity.tools.struts.ValidatorTool
</class>
</tool>
</toolbox>
4) Created an example index.vm file with only this code:
<html>
<head>
<title>$msg.get("label.portal.welcome")</title>
</head>
<body bgcolor="white">
</body>
</html>
label.portal.welcome is defined on my ApplicationResource.properties struts
file.
When I access the index file I get the following error:
VelocityViewServlet : Error processing a template for path '/jsp/index.vm'
java.lang.NullPointerException
at org.apache.velocity.io.VelocityWriter.write(VelocityWriter.java:319)
at
org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:291)
at
org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
at org.apache.velocity.Template.merge(Template.java:256)
at
org.apache.velocity.tools.view.servlet.VelocityViewServlet.performMerge(VelocityViewServlet.java:762)
at
org.apache.velocity.tools.view.servlet.VelocityViewServlet.mergeTemplate(VelocityViewServlet.java:719)
at
org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest(VelocityViewServlet.java:551)
at
org.apache.velocity.tools.view.servlet.VelocityViewServlet.doGet(VelocityViewServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)
So I pretty sure I've missed a step or two when setting Velocity up :)
Also, I would like to know how do I replace velocity tags with database
values I retrieve on my action classes.
Thanks
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