Versions for various Maven artifacts which happen to work well together. A lot of time trial and error has been spent, so feel free to comment and ask anything You want :)

spring drools integration, kie pom.xml

<?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>ftn.bsep9</groupId>
	<artifactId>siem</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>siem</name>
	<description>BSEP project - siem center and agent</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <kie.version>6.2.0.Final</kie.version>
        <!-- 7.7.0 - 7.2.0 - 6.5.0 - 6.4.0 == NOT WORKING -->

        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

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

    <!-- Transitively bring in the Spring IO Platform Bill-of-Materials `pom.xml` -->
    <!--<dependencyManagement>-->
        <!--<dependencies>-->
            <!--<dependency>-->
                <!--<groupId>io.spring.platform</groupId>-->
                <!--<artifactId>platform-bom</artifactId>-->
                <!--<version>2.0.6.RELEASE</version>-->
                <!--<type>pom</type>-->
            <!--</dependency>-->
            <!--<dependency>-->
                <!--<groupId>org.springframework.boot</groupId>-->
                <!--<artifactId>spring-boot-dependencies</artifactId>-->
                <!--<version>2.0.0.RELEASE</version>-->
                <!--<scope>import</scope>-->
                <!--<type>pom</type>-->
            <!--</dependency>-->
        <!--</dependencies>-->
    <!--</dependencyManagement>-->

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jersey</artifactId>
        </dependency>

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>14.0.1</version>
            <!--<scope>test</scope>-->
        </dependency>
        <!--<dependency>-->
            <!--<groupId>org.springframework.data</groupId>-->
            <!--<artifactId>spring-data-jpa</artifactId>-->
            <!--<version>1.5.1.RELEASE</version>-->
        <!--</dependency>-->

        <!--<dependency>-->
            <!--<groupId>org.springframework.data</groupId>-->
            <!--<artifactId>spring-data-commons</artifactId>-->
            <!--<version>1.13.0.RELEASE</version>-->
        <!--</dependency>-->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <scope>compile</scope>
            <exclusions>
                <exclusion>
                    <artifactId>tomcat-annotations-api</artifactId>
                    <groupId>org.apache.tomcat</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
            <scope>compile</scope>
            <exclusions>
                <exclusion>
                    <artifactId>tomcat-annotations-api</artifactId>
                    <groupId>org.apache.tomcat</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- THYMELEAF -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <!-- MONGO DB -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-mongodb</artifactId>
            <version>2.0.6.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.querydsl</groupId>
            <artifactId>querydsl-mongodb</artifactId>
            <version>4.1.4</version>
            <exclusions>
                <exclusion>
                    <groupId>org.mongodb</groupId>
                    <artifactId>mongo-java-driver</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!--  K I E  -->
        <dependency>
            <groupId>org.kie</groupId>
            <artifactId>kie-ci</artifactId>
            <version>${kie.version}</version>
        </dependency>
        <dependency>
            <groupId>org.kie</groupId>
            <artifactId>kie-spring</artifactId>
            <version>${kie.version}</version>
        </dependency>

        <!-- R U L E S -->
        <dependency>
            <groupId>ftn.bsep9</groupId>
            <artifactId>drools-spring-kjar</artifactId>
            <type>jar</type>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>com.querydsl</groupId>
            <artifactId>querydsl-jpa</artifactId>
            <version>4.1.3</version>
        </dependency>

        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.7.0</version>
        </dependency>

        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>

        <!-- TESTS -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.hamcrest</groupId>
            <artifactId>hamcrest-library</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.0.2.RELEASE</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>

            <plugin>
                <groupId>com.mysema.maven</groupId>
                <artifactId>apt-maven-plugin</artifactId>
                <version>1.1.3</version>
                <dependencies>
                    <dependency>
                        <groupId>com.querydsl</groupId>
                        <artifactId>querydsl-apt</artifactId>
                        <version>4.1.3</version>
                    </dependency>
                </dependencies>
                <executions>
                    <execution>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>process</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>target/generated-sources/annotations</outputDirectory>
                            <processor>
                                org.springframework.data.mongodb.repository.support.MongoAnnotationProcessor
                            </processor>
                            <logOnlyOnError>true</logOnlyOnError>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>