CODEWITHSUNDEEP
spring-bootgoogle-cloud-platformgcloudgoogle-cloud-build
notacorn
notacorn

Reputation: 4119

Failure: (ID: 838926df) did not find any jar files with a Main-Class manifest entry

when running gcloud app deploy on my spring boot app, this error happens in Cloud Build.

Upvotes: 5

Views: 4580

Answers (5)

BenVercammen
BenVercammen

Reputation: 91

The root cause is the fact that the packaged .jar file does not have a Main-Class entry in /META-INF/MANIFEST.MF.

My original MANIFEST.MF file looked like this:

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven 3.8.6
Built-By: me
Build-Jdk: 19.0.1

For me, the solution was to add the maven-jar-plugin and manually configure the mainClass.

    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <version>3.3.0</version>
        <configuration>
            <archive>
                <manifest>
                    <mainClass>my.main.MainClass</mainClass>
                </manifest>
            </archive>
        </configuration>
    </plugin>

This resulted in the following MANIFEST.MF

Manifest-Version: 1.0
Created-By: Maven JAR Plugin 3.3.0
Build-Jdk-Spec: 19
Main-Class: my.main.MainClass

You could also check https://www.baeldung.com/spring-boot-main-class for other options, but then you'll have to use spring-boot-starter-parent as parent...

Upvotes: 0

Volodymyr
Volodymyr

Reputation: 91

I was able to fix it for my AppEngine + Gradle project by adding

jar {
    enabled = false
    archiveClassifier = ''
}

to the build.gradle file.

Upvotes: 2

Indrajeet Patil
Indrajeet Patil

Reputation: 735

There can be one or many issues because of which you get this error. For resolution please check below things -

  1. Your app.yaml should have entrypoint and runtime information as below -

    runtime: java11
    entrypoint: java -Xmx64m -jar blahblah.jar

  2. your pom.xml should have appengine maven plugin dependency

`

<plugin>
   <groupId>com.google.cloud.tools</groupId>    
   <artifactId>appengine-maven-plugin</artifactId>
   <version>2.2.0</version>
</plugin>

`

  1. don't modify jar if you want to replace any configs use command -
    jar uf blahblah.jar filename.yaml

  2. make sure you have packaging as a jar in pom.xml like this - <packaging>jar</packaging>

Upvotes: 8

OVelychko
OVelychko

Reputation: 49

Try to comment out in pom.xml packaging into war file, example:

<!--  <packaging>war</packaging> -->

It fixed the issue for me. Good minimal+workable example is here: https://codelabs.developers.google.com/codelabs/cloud-app-engine-springboot#0

Upvotes: 1

notacorn
notacorn

Reputation: 4119

I deleted my maven plugin by accident, so don't delete it.

      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>

Upvotes: 3

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