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POHow to post error messages to the HTML from Struts2 outside of Action class
 

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  1. POHow to post error messages to the HTML from Struts2 outside of Action class
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    <p>I have a register program. When I insert a record on the database, I'll instantiate a class and invoke the method <code>insert()</code>. When I insert a the same record, of course there is a duplicate data error and tons of error messages. I want to capture it with <code>try</code> and <code>catch</code>. I can do that. However, I have no idea how to display the message to the JSP. </p> <p>What I have understand, in an action class, the <code>validate()</code> method and the <code>validation.xml</code> is run first. The insert duplicate error happened after those methods are invoked. </p> <pre><code>import com.opensymphony.xwork2.ActionSupport; import lotmovement.business.crud.InsertUserProfile; import lotmovement.business.entity.UserProfile; import org.apache.commons.lang3.StringUtils; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class RegisterAction extends ActionSupport { private static String userId; private static String password; private static String firstName; private static String lastName; private static int securityLevel; @Override public String execute() { ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml"); InsertUserProfile iup = (InsertUserProfile)context.getBean("insertuserprofile"); iup.Insert(); return SUCCESS; } </code></pre> <p><strong>Here is my insert user profile method of</strong> </p> <pre><code> public void Insert() { ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml"); UserProfile up = (UserProfile)context.getBean("userprofile"); RegisterAction ra = (RegisterAction)context.getBean("registeraction"); EntityStart es = (EntityStart)context.getBean("entitystart"); es.StartDbaseConnection(); up.setUserId(ra.getUserId()); up.setFirstName(ra.getFirstName()); up.setLastName(ra.getLastName()); up.setPassword(ra.getPassword()); up.setSecurityLevel(ra.getSecurityLevel()); es.StartPopulateTransaction(up); es.CloseDbaseConnection(); } </code></pre> <p><strong>This is my JSP:</strong></p> <pre><code>&lt;%@ taglib prefix="s" uri="/struts-tags" %&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"&gt; &lt;link rel="stylesheet" type="text/css" href="CSS/register.css"&gt; &lt;title&gt;Register&lt;/title&gt; &lt;s:head /&gt; &lt;/head&gt; &lt;body&gt; &lt;s:form method="POST" action="register" &gt; &lt;/tr&gt; &lt;tr&gt; &lt;td colspan="2"&gt; &lt;s:actionerror/&gt; &lt;s:fielderror/&gt; &lt;/td&gt; &lt;/tr&gt; &lt;s:textfield label="UserID" key="userId" maxLength="20"/&gt; &lt;s:password label="Password" key="password" maxLength="20"/&gt; &lt;s:password label="retype-Password" key="retypepassword" maxLength="20"/&gt; &lt;s:textfield label="Firstname" key="firstName" maxLength="20"/&gt; &lt;s:textfield label="Lastname" key="lastName" maxLength="20"/&gt; &lt;s:textfield label="SecurityLevel" key="securityLevel" maxLength="20"/&gt; &lt;s:submit value="Register"/&gt; &lt;/s:form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. COPlease consider using the S2 Spring plugin; you're doing a lot of manual work in your action that's both unnecessary and inefficient. Also, actions are instantiated per-request: static variables are Very Bad in almost all circumstances and will lead to race conditions and other indeterminate behavior, particularity under load.
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