Spring-cloud-contract: ClassNotFoundException: SimpleEvaluationContext and Pausable for Stub runner(consumer side)

[yuranos]

@marcingrzejszczak, I've tried it with some of the latest builds and it still fails. Of course, I can manually add 2 extra libs and the problem is gone, but I wonder why I have this problem in the first place. I will attach my whole pom to a deeper analysis:

<?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>com.yuranos.documented.api</groupId>
    <artifactId>raml-based-consumer-application</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>raml-based-consumer-application</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RC1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.RC1</spring-cloud.version>
        <junit.jupiter.version>5.1.0</junit.jupiter.version>
        <junit.vintage.version>5.1.0</junit.vintage.version>
        <junit.platform.version>1.1.0</junit.platform.version>
    </properties>

    <!--<dependencyManagement>-->
        <!--<dependencies>-->
            <!--<dependency>-->
                <!--<groupId>org.springframework.cloud</groupId>-->
                <!--<artifactId>spring-cloud-dependencies</artifactId>-->
                <!--<version>${spring-cloud.version}</version>-->
                <!--<type>pom</type>-->
                <!--<scope>import</scope>-->
            <!--</dependency>-->
        <!--</dependencies>-->
    <!--</dependencyManagement>-->

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-contract-stub-runner</artifactId>
            <version>2.0.0.BUILD-SNAPSHOT</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.integration/spring-integration-core -->
        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-core</artifactId>
            <version>5.0.4.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-expression -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>
    </dependencies>

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

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

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>


</project>

If I uncomment spring-integration-core and spring-expression everything works like a charm.
Without both of them I get:

Caused by: java.lang.ClassNotFoundException: org.springframework.integration.endpoint.Pausable at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_152] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_152] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338) ~[na:1.8.0_152] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_152] ... 64 common frames omitted

If I add integration-core, it changes to:
Caused by: java.lang.ClassNotFoundException: org.springframework.expression.spel.support.SimpleEvaluationContext at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_152] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_152] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338) ~[na:1.8.0_152] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_152] ... 65 common frames omitted

[marcingrzejszczak]

This is your problem <version>2.0.0.RC1</version> . Use 2.0.1.RELEASE of Boot.

[yuranos]

Excellent! Many thanks, @marcingrzejszczak!