Heroku could not be able to realize the main class

Question

following is my pom.xml

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.luckypants</groupId>
    <artifactId>LuckyPants</artifactId>
    <version>1.0-SNAPSHOT</version>
    <name>LuckyPants</name>

    <properties>
        <tomcat.version>7.0.34</tomcat.version>
        <jersey.version>1.8</jersey.version>
        <target.version>1.7</target.version>
        <appassembler.version>1.8</appassembler.version>
        <source.version>1.7</source.version>
        <mvn.compiler.version>3.0</mvn.compiler.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <!--<dependency> <groupId>com.sun.jersey</groupId> <artifactId>jersey-server</artifactId> 
            <version>${jersey.version}</version> </dependency> -->
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <!-- if your container implements Servlet API older than 3.0, use "jersey-container-servlet-core" -->
            <artifactId>jersey-container-servlet</artifactId>
            <version>2.14</version>
        </dependency>
        <!-- if you are using Jersey client specific features without the server 
            side -->
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-client</artifactId>
            <version>2.14</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.connectors</groupId>
            <artifactId>jersey-apache-connector</artifactId>
            <version>2.14</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-client</artifactId>
            <version>2.14</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <version>${tomcat.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-logging-juli</artifactId>
            <version>${tomcat.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <version>${tomcat.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jasper</artifactId>
            <version>${tomcat.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jasper-el</artifactId>
            <version>${tomcat.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jsp-api</artifactId>
            <version>${tomcat.version}</version>
        </dependency>

    </dependencies>
    <build>
        <finalName>LuckyPants</finalName>
        <plugins>
            <!-- <plugin> <artifactId>maven-war-plugin</artifactId> <version>2.1.1</version> 
                <configuration> <warSourceDirectory>src/main/java/com</warSourceDirectory> 
                <webResources> <resource> <directory>WebContent</directory> </resource> </webResources> 
                </configuration> </plugin> -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.3</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>copy</goal>
                        </goals>
                        <configuration>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>com.github.jsimone</groupId>
                                    <artifactId>webapp-runner</artifactId>
                                    <version>7.0.40.0</version>
                                    <destFileName>webapp-runner.jar</destFileName>
                                </artifactItem>
                            </artifactItems>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>appassembler-maven-plugin</artifactId>
                <version>${appassembler.version}</version>
                <configuration>
                    <assembleDirectory>target</assembleDirectory>
                    <programs>
                        <program>
                            <mainClass>launch.Main</mainClass>
                            <name>webapp</name>
                        </program>
                    </programs>
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>assemble</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

The content of my Procfile is web: java %JAVA_OPTS% -cp target\classes;"target\classes\*" Main

but when I run this code in heroku , it gives the following error message

Error: Could not find or load main class launch.Main 2016-07-20T14:22:59.864248+00:00 heroku[run.2063]: State changed from up to complete 2016-07-20T14:23:01.234275+00:00 heroku[web.1]: Process exited with status 1 2016-07-20T14:23:01.248600+00:00 heroku[web.1]: State changed from starting to crashed

But the Main.class is in launch package.

How can I sort this out?

score 1 · Accepted Answer · answered Jul 20 '16 at 22:12

I see several different and conflicting things in your pom.xml and Procfile.

You are including webapp-runner, which should probably be run with this command in your Procfile: java -jar target/dependency/webapp-runner.jar yourapp.war
You are using appassembler-maven-plugin to build an executable JAR file, with the main class launch.Main
You have configured your app to run with the main class Main (no package name) in your Procfile.

In order to properly answer the question, I would have to know how to run your app. You'll need to answer these questions for us:

How do you run the app locally?
What is your Main class? (if you don't know, it probably means you have a WAR file).

If you are deploying a WAR file, you'll need to run with webapp-runner.

If you are running a Main class, you'll need to use the fully qualified class name in your java command in the Profile (i.e. launch.Main).

Heroku could not be able to realize the main class

1 Answers1