diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/pom.xml b/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/pom.xml
deleted file mode 100644
index ceedbcdebed..00000000000
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/pom.xml
+++ /dev/null
@@ -1,104 +0,0 @@
-<?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>org.jetbrains.kotlin</groupId>
-    <artifactId>test-sourceRootsRegisteredSeveralTimes</artifactId>
-    <version>1.0-SNAPSHOT</version>
-
-    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.13.1</version>
-        </dependency>
-        <dependency>
-            <groupId>org.jetbrains.kotlin</groupId>
-            <artifactId>kotlin-stdlib</artifactId>
-            <version>${kotlin.version}</version>
-        </dependency>
-    </dependencies>
-
-    <properties>
-<!--        <kotlin.compiler.jvmTarget>1.4</kotlin.compiler.jvmTarget>-->
-
-<!--        <kotlin.version>1.8.0</kotlin.version>-->
-        <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
-        <maven.compiler.source>17</maven.compiler.source>
-        <maven.compiler.target>17</maven.compiler.target>
-        <maven.compiler.parameters>true</maven.compiler.parameters>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
-    <build>
-        <plugins>
-            <plugin>
-                <artifactId>kotlin-maven-plugin</artifactId>
-                <groupId>org.jetbrains.kotlin</groupId>
-                <version>${kotlin.version}</version>
-                <executions>
-                    <execution>
-                        <id>compile</id>
-                        <goals>
-                            <goal>compile</goal>
-                        </goals>
-                        <configuration>
-                            <sourceDirs>
-                                <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
-                                <sourceDir>${project.basedir}/src/main/java</sourceDir>
-                            </sourceDirs>
-                        </configuration>
-                    </execution>
-                    <execution>
-                        <id>test-compile</id>
-                        <goals>
-                            <goal>test-compile</goal>
-                        </goals>
-                        <configuration>
-                            <sourceDirs>
-                                <sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
-                                <sourceDir>${project.basedir}/src/test/java</sourceDir>
-                            </sourceDirs>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.10.1</version>
-                <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
-                </configuration>
-                <executions>
-                    <execution>
-                        <id>default-compile</id>
-                        <phase>none</phase>
-                    </execution>
-                    <execution>
-                        <id>default-testCompile</id>
-                        <phase>none</phase>
-                    </execution>
-                    <execution>
-                        <id>java-compile</id>
-                        <phase>compile</phase>
-                        <goals>
-                            <goal>compile</goal>
-                        </goals>
-                    </execution>
-                    <execution>
-                        <id>java-test-compile</id>
-                        <phase>test-compile</phase>
-                        <goals>
-                            <goal>testCompile</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
-
-</project>
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/src/main/java/foo/bar/Foo.java b/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/src/main/java/foo/bar/Foo.java
deleted file mode 100644
index 4fa5201b7e1..00000000000
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/src/main/java/foo/bar/Foo.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package foo.bar;
-
-public class Foo {
-}
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/src/main/java/module-info.java b/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/src/main/java/module-info.java
deleted file mode 100644
index cb68639ee71..00000000000
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/src/main/java/module-info.java
+++ /dev/null
@@ -1,6 +0,0 @@
-module foo.bar {
-  exports foo.bar;
-
-
-  requires kotlin.stdlib;
-}
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/src/main/kotlin/koo/bar/Koo.kt b/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/src/main/kotlin/koo/bar/Koo.kt
deleted file mode 100644
index 9b6f13d88b5..00000000000
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/src/main/kotlin/koo/bar/Koo.kt
+++ /dev/null
@@ -1,4 +0,0 @@
-package koo.bar
-
-class Koo {
-}
diff --git a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/verify.bsh b/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/verify.bsh
deleted file mode 100644
index 573d8510644..00000000000
--- a/libraries/tools/kotlin-maven-plugin-test/src/it/java9/test-sourceRootsRegisteredSeveralTimes/verify.bsh
+++ /dev/null
@@ -1,6 +0,0 @@
-import java.io.*;
-
-File file = new File(basedir, "target/test-sourceRootsRegisteredSeveralTimes-1.0-SNAPSHOT.jar");
-if (!file.exists() || !file.isFile()) {
-    throw new FileNotFoundException("Could not find generated JAR: " + file);
-}
diff --git a/libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java b/libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java
index 70eb59469aa..5ae03c7434e 100644
--- a/libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java
+++ b/libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java
@@ -41,7 +41,6 @@ import java.lang.reflect.Field;
 import java.util.*;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 
 import static org.jetbrains.kotlin.maven.Util.joinArrays;
 
@@ -83,7 +82,7 @@ public abstract class KotlinCompileMojoBase<A extends CommonCompilerArguments> e
         List<String> list = new ArrayList<>();
         if (sourceDirs != null && !sourceDirs.isEmpty()) list.addAll(sourceDirs);
         list.addAll(project.getCompileSourceRoots());
-        return list.stream().distinct().collect(Collectors.toList());
+        return list;
     }
 
     @NotNull