diff --git a/java/java20/pom.xml b/java/java20/pom.xml
index 48962f4ea9..815d00f620 100644
--- a/java/java20/pom.xml
+++ b/java/java20/pom.xml
@@ -11,25 +11,6 @@
 	</parent>
 	<build>
 		<plugins>
-			<plugin>
-				<groupId>org.codehaus.mojo</groupId>
-				<artifactId>build-helper-maven-plugin</artifactId>
-				<version>3.4.0</version>
-				<executions>
-					<execution>
-						<id>add-source</id>
-						<phase>generate-sources</phase>
-						<goals>
-							<goal>add-source</goal>
-						</goals>
-						<configuration>
-							<sources>
-								<source>Java</source>
-							</sources>
-						</configuration>
-					</execution>
-				</executions>
-			</plugin>
 			<plugin>
 				<groupId>org.antlr</groupId>
 				<artifactId>antlr4-maven-plugin</artifactId>
diff --git a/kotlin/kotlin/README.md b/kotlin/kotlin/README.md
index cfe09cf9da..0075253d03 100644
--- a/kotlin/kotlin/README.md
+++ b/kotlin/kotlin/README.md
@@ -17,3 +17,41 @@ Anastasiya Shadrina a.shadrina5@mail.ru
 
 ## Origin source
 <https://github.com/shadrina/kotlin-grammar-antlr4>
+
+## Issues
+The grammar has ambiguities in:
+```
+callSuffix
+callableReference
+classBody
+classDeclaration
+classMemberDeclaration
+controlStructureBody
+delegationSpecifier
+delegationSpecifiers
+enumEntries
+functionDeclaration
+functionLiteral
+ifExpression
+importHeader
+jumpExpression
+kotlinFile
+modifier
+objectLiteral
+postfixUnaryExpression
+propertyDeclaration
+receiverType
+secondaryConstructor
+semi
+simpleUserType
+statement
+statements
+superExpression
+type
+typeRHS
+typeReference
+userType
+valueArgument
+whenEntry
+whenExpression
+```
diff --git a/kotlin/kotlin/desc.xml b/kotlin/kotlin/desc.xml
index 84b2a3bc5a..d61ef69530 100644
--- a/kotlin/kotlin/desc.xml
+++ b/kotlin/kotlin/desc.xml
@@ -3,4 +3,12 @@
    <targets>Antlr4ng;Cpp;CSharp;Dart;Java;JavaScript;TypeScript;Python3</targets>
    <grammar-files>KotlinLexer.g4;KotlinParser.g4</grammar-files>
    <grammar-name>Kotlin</grammar-name>
+   <test>
+      <entry-point>kotlinFile</entry-point>
+      <inputs>examples/kotlinFile</inputs>
+   </test>
+   <test>
+      <entry-point>script</entry-point>
+      <inputs>examples/script</inputs>
+   </test>
 </desc>
diff --git a/kotlin/kotlin/examples/script/hello.kts.errors b/kotlin/kotlin/examples/script/hello.kts.errors
deleted file mode 100644
index 5118f86a32..0000000000
--- a/kotlin/kotlin/examples/script/hello.kts.errors
+++ /dev/null
@@ -1 +0,0 @@
-line 1:0 mismatched input 'println' expecting {<EOF>, NL, ';', '@', '@file', 'package', 'import', 'class', 'interface', 'fun', 'object', 'val', 'var', 'typealias', 'in', 'out', '@field', '@property', '@get', '@set', '@receiver', '@param', '@setparam', '@delegate', 'public', 'private', 'protected', 'internal', 'enum', 'sealed', 'annotation', 'data', 'inner', 'tailrec', 'operator', 'inline', 'infix', 'external', 'suspend', 'override', 'abstract', 'final', 'open', 'const', 'lateinit', 'vararg', 'noinline', 'crossinline', 'reified', LabelReference}
diff --git a/kotlin/kotlin/examples/script/preamble_nl.kts.errors b/kotlin/kotlin/examples/script/preamble_nl.kts.errors
deleted file mode 100644
index b54988ebba..0000000000
--- a/kotlin/kotlin/examples/script/preamble_nl.kts.errors
+++ /dev/null
@@ -1 +0,0 @@
-line 6:0 mismatched input 'println' expecting {<EOF>, NL, ';', '@', '@file', 'class', 'interface', 'fun', 'object', 'val', 'var', 'typealias', 'in', 'out', '@field', '@property', '@get', '@set', '@receiver', '@param', '@setparam', '@delegate', 'public', 'private', 'protected', 'internal', 'enum', 'sealed', 'annotation', 'data', 'inner', 'tailrec', 'operator', 'inline', 'infix', 'external', 'suspend', 'override', 'abstract', 'final', 'open', 'const', 'lateinit', 'vararg', 'noinline', 'crossinline', 'reified', LabelReference}
diff --git a/kotlin/kotlin/examples/script/preamble_nl_semi.kts.errors b/kotlin/kotlin/examples/script/preamble_nl_semi.kts.errors
deleted file mode 100644
index f7ed9453a3..0000000000
--- a/kotlin/kotlin/examples/script/preamble_nl_semi.kts.errors
+++ /dev/null
@@ -1 +0,0 @@
-line 6:0 extraneous input 'println' expecting {<EOF>, NL, ';', '@', '@file', 'class', 'interface', 'fun', 'object', 'val', 'var', 'typealias', 'in', 'out', '@field', '@property', '@get', '@set', '@receiver', '@param', '@setparam', '@delegate', 'public', 'private', 'protected', 'internal', 'enum', 'sealed', 'annotation', 'data', 'inner', 'tailrec', 'operator', 'inline', 'infix', 'external', 'suspend', 'override', 'abstract', 'final', 'open', 'const', 'lateinit', 'vararg', 'noinline', 'crossinline', 'reified', LabelReference}