--Create a WAR file in Gradle containing Java Servlet and JSP --Deploy to Apache Tomcat 9
This time, create a directory called mywebapp in any directory and prepare a simple sample code in it.
$ mkdir mywebapp
$ cd mywebapp
mywebapp
├── build.gradle
└── src
└── main
├── java
│ └── com
│ └── example
│ └── MyServlet.java
└── webapp
├── WEB-INF
│ └── web.xml
└── myjsp.jsp
build.gradle
plugins {
id 'war'
}
repositories {
mavenCentral()
}
dependencies {
// Java Servlet 4.0 API
// https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api
providedCompile 'javax.servlet:javax.servlet-api:4.0.1'
}
// Java 14
sourceCompatibility = 14
targetCompatibility = 14
// Application
version = '1.0'
src/main/java/com/example/MyServlet.java
package com.example;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
@WebServlet("/myservlet")
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException {
res.setContentType("text/html; charset=utf-8");
try (PrintWriter out = res.getWriter()) {
out.println("<html><body>");
out.println("Servlet: Hello Servlet World!<br>");
out.println(getServletContext().getServerInfo());
out.println("</body></html>");
}
}
}
src/main/webapp/myjsp.jsp
<%@ page contentType="text/html; charset=utf-8" %><html><body>
JSP: Hello JSP World!<br>
<%= pageContext.getServletContext().getServerInfo() %><br>
java.vm.name: <%= System.getProperty("java.vm.name") %><br>
java.vm.vendor: <%= System.getProperty("java.vm.vendor") %><br>
java.vm.version: <%= System.getProperty("java.vm.version") %><br>
</body></html>
src/main/webapp/WEB-INF/web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- Web Application Deployment Descriptor (Java Servlet 4.0) -->
<web-app
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>myjsp</servlet-name>
<jsp-file>/myjsp.jsp</jsp-file>
</servlet>
<servlet-mapping>
<servlet-name>myjsp</servlet-name>
<url-pattern>/myjsp</url-pattern>
</servlet-mapping>
</web-app>
Create a WAR file with the Gradle build task.
$ gradle build
Make sure the WAR file is generated.
$ file build/libs/mywebapp-1.0.war
build/libs/mywebapp-1.0.war: Zip archive data, at least v1.0 to extract
This time, create a directory called tomcat9 in any directory and install it in that directory.
$ mkdir tomcat9
$ cd tomcat9
Apache Tomcat® - Apache Tomcat 9 Software Downloads
$ wget https://downloads.apache.org/tomcat/tomcat-9/v9.0.37/bin/apache-tomcat-9.0.37.tar.gz
$ tar xf apache-tomcat-9.0.37.tar.gz
Set the environment variable JAVA_HOME.
$ export JAVA_HOME=/Library/Java/JavaVirtualMachines/adoptopenjdk-14.jdk/Contents/Home
$ PATH=${JAVA_HOME}/bin:${PATH}
$ java -version
openjdk version "14.0.1" 2020-04-14
OpenJDK Runtime Environment AdoptOpenJDK (build 14.0.1+7)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 14.0.1+7, mixed mode, sharing)
Start Apache Tomcat 9 with startup.sh.
$ ./apache-tomcat-9.0.37/bin/startup.sh
Using CATALINA_BASE: /Users/foo/tomcat9/apache-tomcat-9.0.37
Using CATALINA_HOME: /Users/foo/tomcat9/apache-tomcat-9.0.37
Using CATALINA_TMPDIR: /Users/foo/tomcat9/apache-tomcat-9.0.37/temp
Using JRE_HOME: /Library/Java/JavaVirtualMachines/adoptopenjdk-14.jdk/Contents/Home
Using CLASSPATH: /Users/foo/tomcat9/apache-tomcat-9.0.37/bin/bootstrap.jar:/Users/foo/tomcat9/apache-tomcat-9.0.37/bin/tomcat-juli.jar
Tomcat started.
Make sure you access it with curl and start it.
$ curl --include -s http://localhost:8080/ | head -15
HTTP/1.1 200
Content-Type: text/html;charset=UTF-8
Transfer-Encoding: chunked
Date: Sun, 12 Jul 2020 10:38:03 GMT
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Apache Tomcat/9.0.37</title>
<link href="favicon.ico" rel="icon" type="image/x-icon" />
<link href="favicon.ico" rel="shortcut icon" type="image/x-icon" />
Shut down Apache Tomcat 9 with shutdown.sh.
$ ./apache-tomcat-9.0.37/bin/shutdown.sh
Using CATALINA_BASE: /Users/foo/tomcat9/apache-tomcat-9.0.37
Using CATALINA_HOME: /Users/foo/tomcat9/apache-tomcat-9.0.37
Using CATALINA_TMPDIR: /Users/foo/tomcat9/apache-tomcat-9.0.37/temp
Using JRE_HOME: /Library/Java/JavaVirtualMachines/adoptopenjdk-14.jdk/Contents/Home
Using CLASSPATH: /Users/foo/tomcat9/apache-tomcat-9.0.37/bin/bootstrap.jar:/Users/foo/tomcat9/apache-tomcat-9.0.37/bin/tomcat-juli.jar
NOTE: Picked up JDK_JAVA_OPTIONS: --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
$ cp mywebapp/build/libs/mywebapp-1.0.war tomcat9/apache-tomcat-9.0.37/webapps/mywebapp.war
$ ./tomcat9/apache-tomcat-9.0.37/bin/startup.sh
Access Java Servlet with curl and check the operation.
$ curl --include http://localhost:8080/mywebapp/myservlet
HTTP/1.1 200
Content-Type: text/html;charset=utf-8
Content-Length: 94
Date: Sun, 12 Jul 2020 13:06:56 GMT
<html><body>
Servlet: Hello Servlet World!<br>
Apache Tomcat/9.0.37
</body></html>
Access JSP with curl and check the operation.
$ curl --include http://localhost:8080/mywebapp/myjsp.jsp
HTTP/1.1 200
Set-Cookie: JSESSIONID=EE7C8309A86FBBEDBCEB618759FF6022; Path=/mywebapp; HttpOnly
Content-Type: text/html;charset=utf-8
Content-Length: 204
Date: Sun, 12 Jul 2020 13:07:08 GMT
<html><body>
JSP: Hello JSP World!<br>
Apache Tomcat/9.0.37<br>
java.vm.name: OpenJDK 64-Bit Server VM<br>
java.vm.vendor: AdoptOpenJDK<br>
java.vm.version: 14.0.1+7<br>
</body></html>
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