Hey, I am getting an error under Eclipse and I do not know how to fix it. when I try to build from http://start.spring.io/ "Generate a Gradle Project with Kotlin and Spring Boot 2.0.0 m7" Import Project -> waiting -> find class containing "fun main"😄 -> and run As -> Kotlin Application ->I get an error:

EXCEPTION: org.jetbrains.kotlin.codegen.CompilationException: Back-end (JVM) Internal error: Couldn't inline method call 'runApplication' into
public fun main(args: kotlin.Array<kotlin.String>): kotlin.Unit defined in pl.app.app[SimpleFunctionDescriptorImpl@636cba5e]
fun main(args: Array<String>) {
    runApplication<AppApplication>(*args)
	val x = args.joinToString()
    println("sasasa $x")
}
Cause: Not generated
Cause: Cannot inline bytecode of class org/springframework/boot/SpringApplicationExtensionsKt which has version 52. This compiler can only inline Java 1.6 bytecode (version 50)
File being compiled and position: (10,5) in G:/praca/spring/app/src/main/kotlin/pl/app/app/AppApplication.kt
PsiElement: runApplication<AppApplication>(*args)
The root cause was thrown at: InlineCodegenUtil.java:157
	at org.jetbrains.kotlin.codegen.inline.InlineCodegen.throwCompilationException(InlineCodegen.java:203)

when I start using ./gradlew bootRun is fine what am I doing wrong?

@Jacol, as far as I can tell, Eclipse plugin really lags behind, its latest supported Kotlin version is 1.0.4, Spring Boot expects at least 1.1.*

You could also ask in #eclipse but it seems not very active.

thank you @alexsderkach I will move my post to #eclipse

Also I don't think Eclipse supports compiler plugins like

kotlin-spring

@Jacol I think that you need to verify on Gradle build files and in Eclipse/project compiler settings that you use proper JDK version. Given the message

Cannot inline bytecode of class org/springframework/boot/SpringApplicationExtensionsKt which has version 52. This compiler can only inline Java 1.6 bytecode (version 50)

I would say that there is some mismatch between JDK versions in settings

or some kotlin dependency is added with wrong jdk version in build.gradle dependencies section

or maybe the simplest thing - you don't have JDK 1.8 installed 😉

OK so I guess some settings in Eclipse points to some other JDK (with lower versoin) or some compatoibilty setings. For example in IntelliJ you set the target JVM version and you can set 6, even if you use JDK8

I don't have Eclipse installed but this is the thing I would search for to solve your problem

so that is really strange

have you launched gradle

eclipse

task before opening project?

?

I updated to kotlin 1.2.20 my spring boot project and now I get this error:

Cannot determine embedded database driver class for database type NONE

Could you share a repro project ? Anything related with https://jira.spring.io/browse/DATACMNS-1245 maybe ?

unfortunately I can't. There is also this log:

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).

And your project works with what version of Kotlin ?

1.2.10 works fine

What version of Boot ?

1.5.8.RELEASE

I have hard time to find the cause of such regression without more infos. Is it in both IDE and command line ?

Could you check you don't have mixed Kotlin version in the classpath

both IDE and command line don't work

and the version is not mixed

@fabricio Can't you just extract the build + database conf in a repro project in order to allow us to help you ?

you mean the .jar?

No a GitHub repo for example

We are about to release Boot 2 RC1 with Kotlin 1.2.20 by default

If there is such issue I would like to have a look now if possible

I need a basic simple project that show the issue