Deploy of Spring Boot app to Heroku using heroku-maven-plugin - crashed app

Question

I'm trying to deploy my Spring Boot app using Heroku Maven Plugin. The deploy finishes fine (mvn heroku:deploy). But when I check Heroku app logs (heroku logs --tail), I see it isn't finding the Main class:

2017-10-03T23:50:45.702415+00:00 heroku[web.1]: Starting process with command `java $JAVA_OPTS -cp target/classes:target/dependency/* Main`
2017-10-03T23:50:48.064526+00:00 app[web.1]: Setting JAVA_TOOL_OPTIONS defaults based on dyno size. Custom settings will override them.
2017-10-03T23:50:48.068505+00:00 app[web.1]: Picked up JAVA_TOOL_OPTIONS: -Xmx300m -Xss512k -Dfile.encoding=UTF-8
2017-10-03T23:50:48.237240+00:00 app[web.1]: Error: Could not find or load main class Main
2017-10-03T23:50:48.314862+00:00 heroku[web.1]: State changed from starting to crashed
2017-10-03T23:50:48.301181+00:00 heroku[web.1]: Process exited with status 1

I don't have any Procfile (rely on defaults). Heroku Maven Plugin configuration looks like this:

<plugin>
    <groupId>com.heroku.sdk</groupId>
    <artifactId>heroku-maven-plugin</artifactId>
    <version>1.2.0</version>
    <configuration>
        <processTypes>
            <web>java $JAVA_OPTS -cp target/classes:target/dependency/* Main</web>
        </processTypes>
    </configuration>
</plugin>

The Main class path is:

BASEPROJDIR/src/main/kotlin/com/virtualstand/ExplorerApplication.kt

2017-10-04T08:32:57.264704+00:00 app[web.1]: Error: Could not find or load main class ExplorerApplication — Luís Soares
– Luís Soares, Commented Oct 4, 2017 at 8:33

Naman · Accepted Answer · 2017-10-04 10:32:20Z

1

You need to make sure that the classpath to the main class is correct:-

<configuration>
    <processTypes>
        <web>java $JAVA_OPTS -cp target/classes:target/dependency/* com.virtualstand.ExplorerApplication</web>
    </processTypes>
</configuration>

answered Oct 4, 2017 at 10:32

Naman

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