CODEWITHSUNDEEP
javajspservlets
Artem Malinko
Artem Malinko

Reputation: 1771

Custom jsp tag is not invoked

I'm trying to write custom jsp tag. But my tag is not invoked. Instead I got response in plain text with my html and jsp tags(maybe browser doesn't parse it as html because of jsp tags). My tld file is in the right place(/WEB-INF/custom.tld) and I have no errors or exceptions in console and I got no clue what is wrong with my tag. Probably it's because of some jsp dependencies or deployment descriptors. I'm using tomcat 7. My code:

web.xml

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

    <display-name>Spring MVC Application</display-name>

    <servlet>
        <servlet-name>HelloWeb</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>HelloWeb</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

</web-app>

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.test</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.1.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>
</project>

custom.tld

<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
        version="2.0">
    <tlib-version>1.0</tlib-version>
    <short-name>Test</short-name>
    <tag>
        <name>greet</name>
        <tag-class>com.test.tag.HelloTag</tag-class>
        <body-content>empty</body-content>
    </tag>
</taglib>

hello.jsp

<%@ taglib prefix="ex" uri="/WEB-INF/custom.tld"%>
<html>
<head>
    <title></title>
</head>
<body>
<ex:greet/>
</body>
</html>

Tag

package com.test.tag;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.io.IOException;

public class HelloTag extends SimpleTagSupport {

    @Override
    public void doTag() throws JspException, IOException {
        getJspContext().getOut().println("Hello!");
    }
}

And my response looks exactly like this:

<%@ taglib prefix="ex" uri="/WEB-INF/custom.tld"%>
<html>
<head>
    <title></title>
</head>
<body>
<ex:greet/>
</body>
</html>

Could you please tell me what am I doing wrong?

Upvotes: 1

Views: 162

Answers (1)

Amit.rk3
Amit.rk3

Reputation: 2417

For servlet url mapping, you have to use <url-pattern>/</url-pattern> instead of <url-pattern>/*</url-pattern>, because /* overrides the default JspServlet mapping. You can find more details about difference between / and /* at this answer

Upvotes: 1

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