ClassNotFoundException: com.example.appengine.demo.jettymain.Main #3299
Description
In which file did you encounter the issue?
Did you change the file? If so, how?
No
Describe the issue
I'm trying to deploy my first GAE Java 11 runtime app. I followed the example in helloworld-servlet and created my own (real) servlet. It works perfectly on my local machine, but when I deploy it, it is not able to find the main class, which comes from appengine-simple-jetty-main. Here's the error:
Error: Could not find or load main class com.example.appengine.demo.jettymain.Main
Caused by: java.lang.ClassNotFoundException: com.example.appengine.demo.jettymain.Main
I've followed every step per the documentation, but it's not working after deployment (works fine on localhost). Am I missing something?
Since simple-jetty-main is a provided dependency, is it supposed to be provided by the runtime? I'm really not clear and found the documentation to be very confusing.
This is my app.yaml:
runtime: java11
entrypoint: 'java -cp "*" com.example.appengine.demo.jettymain.Main <my-app-name>.war'
This is my 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>
<packaging>war</packaging>
<groupId>com.mycompany.services</groupId>
<artifactId>my-app-name</artifactId>
<version>1.0-SNAPSHOT</version>
<name>my-app-name</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<failOnMissingWebXml>false</failOnMissingWebXml>
</properties>
<dependencies>
<dependency>
<groupId>com.example.appengine.demo</groupId>
<artifactId>simple-jetty-main</artifactId>
<version>1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>google-cloud-logging</artifactId>
<version>1.101.2</version>
</dependency>
<dependency>
<groupId>com.sendgrid</groupId>
<artifactId>sendgrid-java</artifactId>
<version>4.6.0</version>
</dependency>
</dependencies>
<build>
<finalName>my-app-name</finalName>
<pluginManagement>
<plugins>
<plugin>
<groupId>com.google.cloud.tools</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>2.3.0</version>
<configuration>
<projectId>GCLOUD_CONFIG</projectId>
<version>1</version>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>3.1.2</version>
<executions>
<execution>
<id>copy</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>
${project.build.directory}/appengine-staging
</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
My directories are sitting parallel to each other (not sure if this is correct):
- appengine-simple-jetty-main
- my-app-name