Spring boot native image failed

[sendev1]

What happened?

I have a simple spring boot application which is running fine in spring boot mode in Intellij or as a jar. Please see below for the logs

C:\`\apps\z_study_spring-boot-web-graal-vm\build\libs>java -jar graal-vm-0.0.1-SNAPSHOT.jar com.palantir.test.Main

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.1.RELEASE)

2020-07-20 16:33:17.550  INFO 25052 --- [           main] com.palantir.test.Main                   : Starting Main on BGTMNWL-9123HKG with PID 25052 (C:\`\apps\z_study_spring-boot-web-graal-vm\build\libs\graal-vm-0.0.1-SNAPSHOT.jar started by URAJAS4 in C:\`\apps\z_study_spring-boot-web-graal-vm\build\libs)
2020-07-20 16:33:17.554  INFO 25052 --- [           main] com.palantir.test.Main                   : No active profile set, falling back to default profiles: default
2020-07-20 16:33:20.009  INFO 25052 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2020-07-20 16:33:20.031  INFO 25052 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-07-20 16:33:20.031  INFO 25052 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.36]
2020-07-20 16:33:20.178  INFO 25052 --- [           main] o.a.c.c.C.[.[localhost].[/graal-vm]      : Initializing Spring embedded WebApplicationContext
2020-07-20 16:33:20.178  INFO 25052 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2531 ms
2020-07-20 16:33:20.540  INFO 25052 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2020-07-20 16:33:20.806  INFO 25052 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path '/graal-vm'
2020-07-20 16:33:20.821  INFO 25052 --- [           main] **com.palantir.test.Main**                   : Started Main in 4.051 seconds (JVM running for 4.845)

But when I try to create native image using plug in I see following error

Warning: Ignoring server-mode native-image argument --no-server.
[hello-graal:17932]    classlist:   8,357.64 ms,  1.37 GB
Error: Main entry point class 'com.palantir.test.Main' not found.
com.oracle.svm.core.util.UserError$UserException: Main entry point class 'com.palantir.test.Main' not found.
        at com.oracle.svm.core.util.UserError.abort(UserError.java:68)
        at com.oracle.svm.hosted.NativeImageGeneratorRunner.buildImage(NativeImageGeneratorRunner.java:302)
        at com.oracle.svm.hosted.NativeImageGeneratorRunner.build(NativeImageGeneratorRunner.java:518)
        at com.oracle.svm.hosted.NativeImageGeneratorRunner.main(NativeImageGeneratorRunner.java:117)

Error: Image build request failed with exit status 1

As you can see from the spring boot jar version log the main class is under package com.palantir.test.Main . Not sure why the plugin is complaining that its not able to find main class.

Here is the build.gradle entry

graal {
	mainClass 'com.palantir.test.Main'
	outputName 'hello-graal'
	graalVersion '20.1.0'
	option '-H:+ReportExceptionStackTraces'
}

What did you want to happen?

native image should be created for spring boot version 2.3.1.RELEASE or any spring boot version supported by Graal

[maffelbaffel]

Hm might this be because of using bootJar instead of jar? I'm trying out this plugin right now and I get the same problem.
Using gradle bootJar my classes are package inside of BOOT-INF/classes while with a simple jar they are package in root of the jar file.

[jUnG3]

Hi,
I have the same problem as @sendev1. When I try to build my project with ./gradlew clean build nativeImage i get this error message: Error: Main entry point class 'de.hello.Application.' not found..

Here is my build.gradle

plugins {
    id 'org.springframework.boot' version '2.2.9.RELEASE'
    id 'io.spring.dependency-management' version '1.0.9.RELEASE'
    id 'java'
    id 'application'
    id 'com.palantir.graal' version '0.7.1-20-g113a84d'
}

apply plugin: 'java'
apply plugin: 'application'

group = 'de.hello'
version = '0.0.1'
sourceCompatibility = '8'
mainClassName = 'de.hello.Application'

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-web'
    implementation 'org.springframework.boot:spring-boot-starter-actuator'
    implementation 'tel.schich:javacan:2.1.0'
    compileOnly 'org.projectlombok:lombok'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }
}

test {
    useJUnitPlatform()
}

graal {
    mainClass 'de.hello.Application'
    graalVersion '20.1.0'
    outputName 'hello'
    option '-H:+ReportExceptionStackTraces'
}

Hm might this be because of using bootJar instead of jar? I'm trying out this plugin right now and I get the same problem.
Using gradle bootJar my classes are package inside of BOOT-INF/classes while with a simple jar they are package in root of the jar file.

How can I use the jar task instead of bootJar? @maffelbaffel can you please post the workaround?