Kotlin compiler returning: Unresolved reference: springframework in Spring 5.0

Question

I'm trying to start playing around with using Kotlin together with Spring 5.0 however I am having issues with the Kotlin compiler not recognising any reference to Spring:

[ERROR] Failed to execute goal org.jetbrains.kotlin:kotlin-maven-plugin:1.1.1:compile (compile) on project kotlin-mvc-project: Compilation failure: Compilation failure:

[ERROR] (file location):[7,12] Unresolved reference: springframework

I'm using the spring milestone version Spring 5.0.0.M5 and Kotlin version 1.1.1 (on both my kotlin-compiler and IntelliJ Kotlin plugin). There are no compile errors highlighted by the IDE in any of my Kotlin files but running the kotlin-compiler it seems to not see Spring 5.0 at all.

Does anyone have any ideas how to fix this? I'm using Maven for this project, I've attached my POM for reference:

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>kotlin-mvc-project</groupId>
<artifactId>kotlin-mvc-project</artifactId>
<version>1.0-SNAPSHOT</version>

<properties>
    <kotlin.version>1.1.1</kotlin.version>
    <spring.version>5.0.0.M5</spring.version>
</properties>

<repositories>
<repository>
    <id>spring-milestones</id>
    <name>Spring Milestones</name>
    <url>https://repo.spring.io/libs-milestone</url>
    <snapshots>
        <enabled>false</enabled>
    </snapshots>
</repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>org.jetbrains.kotlin</groupId>
        <artifactId>kotlin-stdlib</artifactId>
        <version>${kotlin.version}</version>
    </dependency>

    <dependency>
        <groupId>org.jetbrains.kotlin</groupId>
        <artifactId>kotlin-compiler</artifactId>
        <version>${kotlin.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>

</dependencies>

<build>
    <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
    <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
    <plugins>
        <plugin>
            <artifactId>kotlin-maven-plugin</artifactId>
            <groupId>org.jetbrains.kotlin</groupId>
            <version>${kotlin.version}</version>

            <executions>
                <execution>
                    <id>compile</id>
                    <goals> <goal>compile</goal> </goals>
                </execution>

                <execution>
                    <id>test-compile</id>
                    <goals> <goal>test-compile</goal> </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>


</project>

Could you please post the part of the file where the error is occuring? — skalarproduktraum
Sorry not sure what file you mean? I get these errors when the kotlin-compiler runs after calling mvn clean install — Plog
I've managed to fix this for now by rolling back to the current release version of Spring. 4.3.7.RELEASE. No idea why I can't get 5.0 to work though — Plog
[ERROR] (file location):[7,12] Unresolved reference: springframework This error I meant -- what's on the line where this occurs? — skalarproduktraum
Ah right. It was just import org.springframework.context.annotation.Bean; There is one of those errors for every reference to a spring object in the code. — Plog

Plog Plog · Accepted Answer · 2017-07-18T08:36:26

After help from @DmitrySenkovich in narrowing down that it was not an issue with my pom I investigated what could be going wrong in my local maven repository. I checked out the jars in my .m2 folder and they seemed a bit wrong and missing certain things. I tried wiping the maven repo but they kept being pulled back the same.

This issue was on a corporate machine and after doing some investigation it seems our maven settings.xml were configured to pull down dependencies from a company wide Artifactory and not maven central/any other repo.

Dependencies are supposed to be pulled down into this Arifactory from other repositories as required but for whatever reason (I assume because they were being pulled down from a repo other than maven central) the jars for the milestone Spring builds were not pulling down correctly. By removing these and manually adding the jars to Artifactory I was able to finally resolve the issue.

Kotlin compiler returning: Unresolved reference: springframework in Spring 5.0

1 Answers