Hi-
I get the following error msg on tomcat at this URL:
http://localhost:8080/examples/HelloWorld
I am wondering it seems like I am getting the maven project to build in
Moonshine
IDE. then I put a new web.xml file in the examples directory in the tomcat
server
unzipped files. Then, I try to copy my class over and run the example, and I
get this error
msg. listed below.
I just want to try to deploy one or two servlets which I know little about, so
I can switch to blazeds and use tomcat. It's kind of like a helloworld to
tomcat intro.
I am hoping to use apache royale with blazeds.
Any help is greatly appreciated. THANKS. j. mcnamara
Root Cause
java.lang.ClassCastException: class HelloWorld cannot be cast to class
jakarta.servlet.Servlet
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
/**
* This servlet program is used to print "Hello World" on
* client browser by implementing servlet interface.
* @author w3spoint
*/
public class HelloWorld implements Servlet {
private static final long serialVersionUID = 1L;
//no-argument constructor.
public HelloWorld() {
}
ServletConfig config=null;
@Override
public void init(ServletConfig config) throws ServletException {
this.config = config;
System.out.println("Do initialization here.");
}
@Override
public void destroy() {
System.out.println("Do clean-up process here.");
}
@Override
public ServletConfig getServletConfig() {
return config;
}
@Override
public String getServletInfo() {
return "w3spoint.com";
}
@Override
public void service(ServletRequest request, ServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<h1>Hello World example using " +
"servlet interface.</h1>");
out.close();
}}
// the sample code taken from w3schools builds right
the web.xml reads
from conf/server.xml
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="false"> <context docbase="webapps"
path="/webapps/examples"/>
my pom.xml looks like this:
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd";
xmlns="http://maven.apache.org/POM/4.0.0";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<modelVersion>4.0.0</modelVersion>
<groupId>local</groupId>
<artifactId>NewJavaMavenProject</artifactId>
<name>NewJavaMavenProject</name>
<version>0.1.0-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<maven.compiler.plugin.version>3.8.1</maven.compiler.plugin.version>
<maven.compiler.target>17</maven.compiler.target>
<maven.compiler.source>17</maven.compiler.source>
</properties>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<profiles>
<profile>
<id>exclude-central-repo</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<repositories>
<repository>
<id>central</id>
<url>https://repo.maven.apache.org/maven2</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
</profile>
</profiles>
<build>
<sourceDirectory>src/main/java</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<executions>
<execution>
<configuration>
<skip>true</skip>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.4.0</version>
<configuration>
<!--<webXml>C:\Users\myuser\apache-tomcat-10.1.10\webapps\NewJavaMavenProject\target\NewJavaMavenProject-0.1.0-SNAPSHOT</webXml>-->
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass/>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build></project>
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