diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index 26ca9a0..3796f0e 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -12,7 +12,7 @@ repositories {
 dependencies {
     implementation(kotlin("stdlib"))
     implementation(gradleApi())
-    implementation("com.google.protobuf:protobuf-java:3.24.1")
+    implementation("com.google.protobuf:protobuf-javalite:3.24.2")
 }
 
 kotlin {
@@ -21,6 +21,16 @@ kotlin {
 
 protobuf {
     protoc {
-        artifact = "com.google.protobuf:protoc:3.24.1"
+        artifact = "com.google.protobuf:protoc:3.24.2"
+    }
+
+    generateProtoTasks {
+        ofSourceSet("main").forEach { task ->
+            task.builtins {
+                getByName("java") {
+                    option("lite")
+                }
+            }
+        }
     }
 }
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/BuildWorkflow.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/BuildWorkflow.kt
index 63052ed..2bc1191 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/BuildWorkflow.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/BuildWorkflow.kt
@@ -7,53 +7,57 @@ import org.gradle.api.Project
  * Gradle build configurator.
  */
 object BuildWorkflow {
+
     /**
      * Returns build configuration handler of this project.
      */
-    fun of(project: Project): ConfigurationHandler {
-        /**
-         * Build configuration handler that applies configuration to project.
-         */
-        class BuildConfigurationHandler(private val project: Project) : ConfigurationHandler {
+    fun of(project: Project): BuildConfigurationHandler {
+        /** inheritDoc */
+        class Handler(private val project: Project) : BuildConfigurationHandler {
             /** inheritDoc */
-            override fun use(plugin: Plugin<Project>): ConfigurationHandler {
+            override fun use(plugin: Plugin<Project>): BuildConfigurationHandler {
                 plugin.apply(this.project)
                 return this
             }
 
             /** inheritDoc */
-            override fun setGroup(group: String): ConfigurationHandler {
+            override fun setGroup(group: String): BuildConfigurationHandler {
                 this.project.group = group
                 return this
             }
 
             /** inheritDoc */
-            override fun setVersion(version: String): ConfigurationHandler {
+            override fun setVersion(version: String): BuildConfigurationHandler {
                 this.project.version = version
                 return this
             }
         }
-        return BuildConfigurationHandler(project)
+
+        return Handler(project)
     }
 
-    interface ConfigurationHandler {
+    /**
+     * Build configuration handler that applies configuration to a project.
+     */
+    interface BuildConfigurationHandler {
+
         /**
          * Puts plugin into operation
          */
-        fun use(plugin: Plugin<Project>): ConfigurationHandler
+        fun use(plugin: Plugin<Project>): BuildConfigurationHandler
 
         /**
          * Sets the group of this project.
          *
          * @param group The group of this project.
          */
-        fun setGroup(group: String): ConfigurationHandler
+        fun setGroup(group: String): BuildConfigurationHandler
 
         /**
          * Sets the version of this project.
          *
          * @param version The version of this project.
          */
-        fun setVersion(version: String): ConfigurationHandler
+        fun setVersion(version: String): BuildConfigurationHandler
     }
 }
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/checkstyle/CheckstyleConfiguration.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/checkstyle/CheckstyleConfiguration.kt
index adb8bf9..714c346 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/checkstyle/CheckstyleConfiguration.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/checkstyle/CheckstyleConfiguration.kt
@@ -6,55 +6,64 @@ import org.gradle.api.Project
 import org.gradle.api.plugins.quality.Checkstyle
 import org.gradle.api.plugins.quality.CheckstyleExtension
 
-private const val CHECKSTYLE_PLUGIN_ID = "checkstyle"
-
+/**
+ * Checkstyle plugin configuration.
+ */
 class CheckstyleConfiguration(
     private val toolVersion: String,
     private val reportFormats: List<CheckstyleReportFormat>
 ) : Plugin<Project> {
 
-    override fun apply(project: Project) {
-        this.setupPlugin(project)
-        this.enableReports(project)
-    }
-
-    private fun setupPlugin(project: Project) {
-        project.plugins.apply(CHECKSTYLE_PLUGIN_ID)
-        project.extensions
-            .getByType(CheckstyleExtension::class.java)
-            .toolVersion = this.toolVersion
-    }
-
-    private fun enableReports(project: Project) {
-        project.tasks
-            .withType(Checkstyle::class.java)
-            .configureEach { checkstyle ->
-                for (format in this.reportFormats) {
-                    format.subscribeTo(checkstyle.reports)
-                }
-            }
-    }
-
     companion object {
 
+        private const val CHECKSTYLE_PLUGIN_ID = "checkstyle"
+
+        /** Returns new plugin configuration builder. */
         fun newBuilder() = Builder()
 
+        /** The configuration builder */
         class Builder {
 
             private var toolVersion = Presets.CHECKSTYLE.version()
             private val enabledFormats = mutableListOf<CheckstyleReportFormat>()
 
+            /** Sets Checkstyle tool version. */
             fun setVersion(version: String): Builder {
                 this.toolVersion = version
                 return this
             }
 
+            /** Enables Checkstyle report format. */
             fun enable(reportFormat: CheckstyleReportFormat): Builder {
                 this.enabledFormats.add(reportFormat)
                 return this
             }
 
+            /** Returns new Checkstyle plugin configuration. */
             fun build() = CheckstyleConfiguration(this.toolVersion, this.enabledFormats)
         }
     }
+
+    /** @inheritDoc */
+    override fun apply(project: Project) {
+        this.setupPlugin(project)
+        this.enableReports(project)
+    }
+
+    private fun setupPlugin(project: Project) {
+        project.plugins.apply(CHECKSTYLE_PLUGIN_ID)
+        project.extensions
+            .getByType(CheckstyleExtension::class.java)
+            .toolVersion = this.toolVersion
+    }
+
+    private fun enableReports(project: Project) {
+        project.tasks
+            .withType(Checkstyle::class.java)
+            .configureEach { checkstyle ->
+                for (format in this.reportFormats) {
+                    format.subscribeTo(checkstyle.reports)
+                }
+            }
+    }
 }
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/checkstyle/CheckstyleReportFormat.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/checkstyle/CheckstyleReportFormat.kt
index f1a3f64..93f5504 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/checkstyle/CheckstyleReportFormat.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/checkstyle/CheckstyleReportFormat.kt
@@ -5,16 +5,19 @@ import org.gradle.api.plugins.quality.CheckstyleReports
 enum class CheckstyleReportFormat {
 
     HTML {
+        /**@inheritDoc */
         override fun subscribeTo(checkstyleReports: CheckstyleReports) {
             checkstyleReports.html.required.set(true)
         }
     },
 
     XML {
+        /**@inheritDoc */
         override fun subscribeTo(checkstyleReports: CheckstyleReports) {
             checkstyleReports.xml.required.set(true)
         }
     };
 
+    /** Subscribes to generate report type. */
     abstract fun subscribeTo(checkstyleReports: CheckstyleReports)
 }
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/jacoco/JacocoConfiguration.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/jacoco/JacocoConfiguration.kt
index 99324e7..2793f27 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/jacoco/JacocoConfiguration.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/jacoco/JacocoConfiguration.kt
@@ -5,14 +5,41 @@ import org.gradle.api.Project
 import org.gradle.api.tasks.testing.Test
 import org.gradle.testing.jacoco.tasks.JacocoReport
 
-private const val JACOCO_PLUGIN_ID = "jacoco"
+/**
+ * Jacoco plugin configuration.
+ */
+class JacocoConfiguration private constructor(
+    private val reportFormats: List<JacocoReportFormat>
+) : Plugin<Project> {
 
-class JacocoConfiguration private constructor(private val reportFormats: List<JacocoReportFormat>) :
-    Plugin<Project> {
+    companion object {
+
+        private const val JACOCO_PLUGIN_ID = "jacoco"
+
+        /** Returns new plugin configuration builder. */
+        fun newBuilder() = Builder()
+
+        /** The configuration builder */
+        class Builder {
+
+            private val enabledFormats = mutableListOf<JacocoReportFormat>()
+
+            /** Enables Jacoco report format. */
+            fun enable(reportFormat: JacocoReportFormat): Builder {
+                this.enabledFormats.add(reportFormat)
+                return this
+            }
+
+            /** Returns new Jacoco plugin configuration. */
+            fun build() = JacocoConfiguration(this.enabledFormats)
+        }
+    }
 
+    /** @inheritDoc */
     override fun apply(project: Project) {
         this.setupPlugin(project)
         this.enableReports(project)
+        this.addTaskFinalizer(project)
     }
 
     private fun setupPlugin(project: Project) {
@@ -28,29 +55,12 @@ class JacocoConfiguration private constructor(private val reportFormats: List<Ja
                     format.subscribeTo(jacocoReport.reports)
                 }
             }
+    }
 
+    private fun addTaskFinalizer(project: Project) {
         project.tasks
             .withType(Test::class.java) { test ->
                 test.finalizedBy(project.tasks.withType(JacocoReport::class.java))
             }
     }
-
-    companion object {
-        /**
-         * Returns new JacocoConfigurationBuilder instance.
-         */
-        fun newBuilder() = Builder()
-
-        class Builder {
-
-            private val enabledFormats = mutableListOf<JacocoReportFormat>()
-
-            fun enable(reportFormat: JacocoReportFormat): Builder {
-                this.enabledFormats.add(reportFormat)
-                return this
-            }
-
-            fun build() = JacocoConfiguration(this.enabledFormats)
-        }
-    }
 }
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/jacoco/JacocoReportFormat.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/jacoco/JacocoReportFormat.kt
index e5ce2ad..4ff1a68 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/jacoco/JacocoReportFormat.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/jacoco/JacocoReportFormat.kt
@@ -5,22 +5,26 @@ import org.gradle.testing.jacoco.tasks.JacocoReportsContainer
 enum class JacocoReportFormat {
 
     HTML {
+        /**@inheritDoc */
         override fun subscribeTo(jacocoReportContainer: JacocoReportsContainer) {
             jacocoReportContainer.html.required.set(true);
         }
     },
 
     XML {
+        /**@inheritDoc */
         override fun subscribeTo(jacocoReportContainer: JacocoReportsContainer) {
             jacocoReportContainer.xml.required.set(true);
         }
     },
 
     CSV {
+        /**@inheritDoc */
         override fun subscribeTo(jacocoReportContainer: JacocoReportsContainer) {
             jacocoReportContainer.csv.required.set(true);
         }
     };
 
+    /** Subscribes to generate report type. */
     abstract fun subscribeTo(jacocoReportContainer: JacocoReportsContainer)
 }
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyConfiguration.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyConfiguration.kt
new file mode 100644
index 0000000..c64cb67
--- /dev/null
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyConfiguration.kt
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2023, Raccoons. Developing simple way to change.
+ *
+ * @license MIT
+ */
+
+package co.raccoons.local.gradle.java
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+
+/**
+ * The scopes of the dependencies.
+ */
+internal class DependencyConfiguration : Plugin<Project> {
+
+    private val dependencyScopes = mutableMapOf<String, MutableList<String>>()
+
+    /** @inheritDoc */
+    override fun apply(project: Project) {
+        for ((configurationScope, dependencies) in dependencyScopes) {
+            for (dependency in dependencies) {
+                project.dependencies.add(configurationScope, dependency)
+            }
+        }
+    }
+
+    /** Adds dependency to the corresponding configuration scope. */
+    fun add(dependency: Dependency): DependencyConfiguration {
+        this.dependencyScopes
+            .getOrPut(dependency.configurationName()) {
+                mutableListOf()
+            }
+            .add(dependency.dependencyNotation().toString())
+
+        return this
+    }
+}
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyNotation.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyNotation.kt
index 9840d5e..019fe5d 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyNotation.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyNotation.kt
@@ -6,7 +6,7 @@
 
 package co.raccoons.local.gradle.java
 
-class DependencyNotation(
+data class DependencyNotation(
     private val group: String,
     private val name: String,
     private val version: String
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyScope.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyScope.kt
deleted file mode 100644
index c40e035..0000000
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/DependencyScope.kt
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * Copyright 2023, Raccoons. Developing simple way to change.
- *
- * @license MIT
- */
-
-package co.raccoons.local.gradle.java
-
-import org.gradle.api.Plugin
-import org.gradle.api.Project
-
-class DependencyScope : Plugin<Project> {
-
-    private val dependencies = mutableMapOf<String, MutableList<String>>()
-
-    override fun apply(project: Project) {
-        for ((configurationName, configurationDependencies) in dependencies) {
-            for (dependency in configurationDependencies) {
-                project.dependencies.add(configurationName, dependency)
-            }
-        }
-    }
-
-    fun add(dependency: Dependency): DependencyScope {
-        this.dependencies.getOrPut(dependency.configurationName()) {
-            mutableListOf()
-        }.add(dependency.dependencyNotation().toString())
-
-        return this
-    }
-}
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/Implementation.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/Implementation.kt
index c4d087a..b4d64d1 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/Implementation.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/Implementation.kt
@@ -6,10 +6,16 @@
 
 package co.raccoons.local.gradle.java
 
-private const val CONFIGURATION_NAME = "implementation"
+/**
+ * Implementation dependency.
+ */
+data class Implementation(
+    private val group: String,
+    private val name: String,
+    private val version: String
+) : Dependency(CONFIGURATION_NAME, DependencyNotation(group, name, version)) {
 
-class Implementation(
-    group: String,
-    name: String,
-    version: String
-) : Dependency(CONFIGURATION_NAME, DependencyNotation(group, name, version))
+    companion object {
+        private const val CONFIGURATION_NAME = "implementation"
+    }
+}
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/JavaConfiguration.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/JavaConfiguration.kt
new file mode 100644
index 0000000..d2f05a7
--- /dev/null
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/JavaConfiguration.kt
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2023, Raccoons. Developing simple way to change.
+ *
+ * @license MIT
+ */
+
+package co.raccoons.local.gradle.java
+
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.tasks.bundling.Jar
+
+/**
+ * The Java plugin configuration.
+ */
+class JavaConfiguration(private final val manifest: Manifest) : Plugin<Project> {
+
+    companion object {
+        private const val JAVA_PLUGIN_ID = "java"
+    }
+
+    /** @inheritDoc */
+    override fun apply(project: Project) {
+        this.setupPlugin(project)
+        this.configureTaskJar(project)
+    }
+
+    private fun setupPlugin(project: Project) {
+        project.plugins.apply(JAVA_PLUGIN_ID)
+    }
+
+    private fun configureTaskJar(project: Project) {
+        project.tasks
+            .withType(Jar::class.java)
+            .configureEach { jar ->
+                jar.manifest.attributes
+                    .putAll(this.manifest.attributesMap)
+            }
+    }
+}
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/JavaLibraryConfiguration.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/JavaLibraryConfiguration.kt
index d3caf9d..39062c1 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/JavaLibraryConfiguration.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/JavaLibraryConfiguration.kt
@@ -3,36 +3,39 @@ package co.raccoons.local.gradle.java
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 
-private const val JAVA_LIBRARY_PLUGIN_ID = "java-library"
-
-class JavaLibraryConfiguration private constructor(private val dependencyScope: DependencyScope) :
-    Plugin<Project> {
-
-    override fun apply(project: Project) {
-        this.setupPlugin(project)
-    }
-
-    private fun setupPlugin(project: Project) {
-        project.plugins.apply(JAVA_LIBRARY_PLUGIN_ID)
-        dependencyScope.apply(project)
-    }
+/**
+ * The Java Library plugin configuration.
+ */
+class JavaLibraryConfiguration private constructor(
+    private val dependencyConfiguration: DependencyConfiguration
+) : Plugin<Project> {
 
     companion object {
+        private const val JAVA_LIBRARY_PLUGIN_ID = "java-library"
 
-        fun default() = this.newBuilder().build()
+        /** Returns default configuration of the Java Library plugin. */
+        fun default(): JavaLibraryConfiguration = newBuilder().build()
 
+        /** Returns new plugin configuration builder. */
         fun newBuilder() = Builder()
 
+        /** The configuration builder */
         class Builder {
 
-            private val dependencyScope = DependencyScope()
+            private val dependencyConfiguration = DependencyConfiguration()
 
             fun addDependency(dependency: Dependency): Builder {
-                this.dependencyScope.add(dependency)
+                dependencyConfiguration.add(dependency)
                 return this
             }
 
-            fun build() = JavaLibraryConfiguration(this.dependencyScope)
+            fun build() = JavaLibraryConfiguration(this.dependencyConfiguration)
         }
     }
+
+    /** @inheritDoc */
+    override fun apply(project: Project) {
+        project.plugins.apply(JAVA_LIBRARY_PLUGIN_ID)
+        dependencyConfiguration.apply(project)
+    }
 }
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/TestImplementation.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/TestImplementation.kt
index ceb5cc4..ac07b7f 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/TestImplementation.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/TestImplementation.kt
@@ -6,10 +6,16 @@
 
 package co.raccoons.local.gradle.java
 
-private const val CONFIGURATION_NAME = "testImplementation"
+/**
+ * Test implementation dependency.
+ */
+data class TestImplementation(
+    private val group: String,
+    private val name: String,
+    private val version: String
+) : Dependency(CONFIGURATION_NAME, DependencyNotation(group, name, version)) {
 
-class TestImplementation(
-    group: String,
-    name: String,
-    version: String
-) : Dependency(CONFIGURATION_NAME, DependencyNotation(group, name, version))
+    companion object {
+        private const val CONFIGURATION_NAME = "testImplementation"
+    }
+}
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/javacompile/Version.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/Version.kt
similarity index 84%
rename from buildSrc/src/main/kotlin/co/raccoons/local/gradle/javacompile/Version.kt
rename to buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/Version.kt
index ee53a06..8384aae 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/javacompile/Version.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/java/Version.kt
@@ -1,4 +1,10 @@
-package co.raccoons.local.gradle.javacompile
+/*
+ * Copyright 2023, Raccoons. Developing simple way to change.
+ *
+ * @license MIT
+ */
+
+package co.raccoons.local.gradle.java
 
 import org.gradle.api.Plugin
 import org.gradle.api.Project
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/javadoc/JavadocConfiguration.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/javadoc/JavadocConfiguration.kt
index 5b05410..0201195 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/javadoc/JavadocConfiguration.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/javadoc/JavadocConfiguration.kt
@@ -5,34 +5,36 @@ import org.gradle.api.Project
 import org.gradle.api.tasks.javadoc.Javadoc
 import org.gradle.external.javadoc.StandardJavadocDocletOptions
 
+/**
+ * Javadoc plugin configuration.
+ */
 class JavadocConfiguration private constructor(private val tags: List<String>) : Plugin<Project> {
 
-    override fun apply(project: Project) {
-        this.setupPlugin(project)
-    }
-
-    private fun setupPlugin(project: Project) {
-        project.tasks
-            .withType(Javadoc::class.java)
-            .configureEach { javadoc ->
-                (javadoc.options as StandardJavadocDocletOptions).tags(tags)
-            }
-    }
-
     companion object {
 
+        /** Returns new plugin configuration builder. */
         fun newBuilder() = Builder()
 
+        /** The configuration builder */
         class Builder {
 
             private val tags = mutableListOf<String>()
 
             fun addTag(tag: JavadocTag): Builder {
-                this.tags.add(tag.toString())
+                tags.add(tag.toString())
                 return this
             }
 
-            fun build() = JavadocConfiguration(this.tags.toList())
+            fun build() = JavadocConfiguration(tags.toList())
         }
     }
+
+    /** @inheritDoc */
+    override fun apply(project: Project) {
+        project.tasks
+            .withType(Javadoc::class.java)
+            .configureEach { javadoc ->
+                (javadoc.options as StandardJavadocDocletOptions).tags(tags)
+            }
+    }
 }
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/repository/Repository.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/repository/Repository.kt
index 10460e6..96b10bd 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/repository/Repository.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/repository/Repository.kt
@@ -3,15 +3,20 @@ package co.raccoons.local.gradle.repository
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 
+/**
+ * Dependency lookup repository.
+ */
 enum class Repository : Plugin<Project> {
 
     MAVEN_CENTRAL {
+        /**@inheritDoc */
         override fun apply(project: Project) {
             project.repositories.mavenCentral()
         }
     },
 
     MAVEN_LOCAL {
+        /**@inheritDoc */
         override fun apply(project: Project) {
             project.repositories.mavenLocal()
         }
diff --git a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/test/TestNG.kt b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/test/TestNG.kt
index dc0a2fe..5c00ad0 100644
--- a/buildSrc/src/main/kotlin/co/raccoons/local/gradle/test/TestNG.kt
+++ b/buildSrc/src/main/kotlin/co/raccoons/local/gradle/test/TestNG.kt
@@ -1,41 +1,46 @@
 package co.raccoons.local.gradle.test
 
 import co.raccoons.local.gradle.java.Dependency
-import co.raccoons.local.gradle.java.DependencyScope
+import co.raccoons.local.gradle.java.DependencyConfiguration
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.tasks.testing.Test
 
-class TestNG private constructor(private val dependencyScope: DependencyScope) : Plugin<Project> {
-
-    override fun apply(project: Project) {
-        this.setupPlugin(project)
-    }
-
-    private fun setupPlugin(project: Project) {
-        dependencyScope.apply(project)
-
-        project.tasks
-            .withType(Test::class.java)
-            .configureEach { test ->
-                test.useTestNG()
-            }
-    }
+class TestNG private constructor(
+    private val dependencyConfiguration: DependencyConfiguration
+) : Plugin<Project> {
 
     companion object {
 
+        /** Returns new plugin configuration builder. */
         fun newBuilder() = Builder()
 
+        /** The configuration builder */
         class Builder {
 
-            private val dependencyScope = DependencyScope()
+            private val dependencyConfiguration = DependencyConfiguration()
 
             fun addDependency(dependency: Dependency): Builder {
-                this.dependencyScope.add(dependency)
+                this.dependencyConfiguration.add(dependency)
                 return this
             }
 
-            fun build() = TestNG(this.dependencyScope)
+            fun build() = TestNG(this.dependencyConfiguration)
         }
     }
+
+    /** @inheritDoc */
+    override fun apply(project: Project) {
+        this.setupPlugin(project)
+    }
+
+    private fun setupPlugin(project: Project) {
+        dependencyConfiguration.apply(project)
+
+        project.tasks
+            .withType(Test::class.java)
+            .configureEach { test ->
+                test.useTestNG()
+            }
+    }
 }
diff --git a/buildSrc/src/main/proto/co/raccoons/local/gradle/java/Manifest.proto b/buildSrc/src/main/proto/co/raccoons/local/gradle/java/Manifest.proto
new file mode 100644
index 0000000..e58f9f3
--- /dev/null
+++ b/buildSrc/src/main/proto/co/raccoons/local/gradle/java/Manifest.proto
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2023, Raccoons. Developing simple way to change.
+ *
+ * @license MIT
+ */
+
+syntax = "proto3";
+
+package co.raccoons.local.gradle.java;
+
+option java_outer_classname = "ManifestProto";
+option java_multiple_files = true;
+
+message Manifest {
+  map<string, string> attributes = 1;
+}
\ No newline at end of file
diff --git a/lib/build.gradle.kts b/lib/build.gradle.kts
index 9a47763..6dd0f91 100644
--- a/lib/build.gradle.kts
+++ b/lib/build.gradle.kts
@@ -9,24 +9,30 @@ import co.raccoons.local.gradle.checkstyle.CheckstyleConfiguration
 import co.raccoons.local.gradle.checkstyle.CheckstyleReportFormat
 import co.raccoons.local.gradle.jacoco.JacocoConfiguration
 import co.raccoons.local.gradle.jacoco.JacocoReportFormat
-import co.raccoons.local.gradle.java.JavaLibraryConfiguration
+import co.raccoons.local.gradle.java.JavaConfiguration
+import co.raccoons.local.gradle.java.Manifest
 import co.raccoons.local.gradle.java.TestImplementation
-import co.raccoons.local.gradle.javacompile.Version
+import co.raccoons.local.gradle.java.Version
 import co.raccoons.local.gradle.javadoc.JavadocConfiguration
 import co.raccoons.local.gradle.javadoc.JavadocTag
 import co.raccoons.local.gradle.publish.MavenPublishConfiguration
-import co.raccoons.local.gradle.publish.maven.Pom
 import co.raccoons.local.gradle.publish.maven.License
+import co.raccoons.local.gradle.publish.maven.Pom
 import co.raccoons.local.gradle.publish.maven.Publication
 import co.raccoons.local.gradle.repository.Repository
 import co.raccoons.local.gradle.test.TestNG
+import java.time.LocalDateTime
 
+/**
+ * Gradle build entry point.
+ */
 BuildWorkflow.of(project)
     .setGroup("co.raccoons")
     .setVersion("1.0")
     .use(Repository.MAVEN_LOCAL)
     .use(Repository.MAVEN_CENTRAL)
-    .use(JavaLibraryConfiguration.default())
+    .use(Configuration.java())
+//    .use(JavaLibraryConfiguration.default())
     .use(Version.JAVA.of(20))
     .use(Configuration.testNG())
     .use(Configuration.jacoco())
@@ -34,21 +40,38 @@ BuildWorkflow.of(project)
     .use(Configuration.checkstyle())
     .use(Configuration.mavenPublish())
 
-
+/**
+ * The configuration of the project plugins.
+ */
 internal object Configuration {
 
+    /** Returns ready to use Java plugin configuration. */
+    fun java(): JavaConfiguration {
+        val manifest = Manifest.newBuilder()
+            .putAttributes("Name", "Meeko Library")
+            .putAttributes("Implementation-Title", "co.raccoons.meeko")
+            .putAttributes("Implementation-Vendor", "Raccoons")
+            .putAttributes("Implementation-Build-Date", LocalDateTime.now().toString())
+            .build();
+
+        return JavaConfiguration(manifest)
+    }
+
+    /** Returns ready to use TestNG plugin configuration. */
     fun testNG() =
         TestNG.newBuilder()
             .addDependency(TestImplementation("org.testng", "testng", "7.8.0"))
             .addDependency(TestImplementation("org.slf4j", "slf4j-simple", "2.0.7"))
             .build()
 
+    /** Returns ready to use Jacoco plugin configuration. */
     fun jacoco() =
         JacocoConfiguration.newBuilder()
             .enable(JacocoReportFormat.HTML)
             .enable(JacocoReportFormat.XML)
             .build()
 
+    /** Returns ready to use Javadoc plugin configuration. */
     fun javadoc() =
         JavadocConfiguration.newBuilder()
             .addTag(JavadocTag("apiNote", "API Note"))
@@ -56,12 +79,14 @@ internal object Configuration {
             .addTag(JavadocTag("implNote", "Implementation Note"))
             .build()
 
+    /** Returns ready to use Checkstyle plugin configuration. */
     fun checkstyle() =
         CheckstyleConfiguration.newBuilder()
             .setVersion("10.12.2")
             .enable(CheckstyleReportFormat.HTML)
             .build()
 
+    /** Returns ready to use Maven publish plugin configuration. */
     fun mavenPublish(): MavenPublishConfiguration {
         val license =
             License.newBuilder()
diff --git a/lib/src/main/java/co/raccoons/meeko/Optional.java b/lib/src/main/java/co/raccoons/meeko/util/Optional.java
similarity index 93%
rename from lib/src/main/java/co/raccoons/meeko/Optional.java
rename to lib/src/main/java/co/raccoons/meeko/util/Optional.java
index 3848ca7..fe6880b 100644
--- a/lib/src/main/java/co/raccoons/meeko/Optional.java
+++ b/lib/src/main/java/co/raccoons/meeko/util/Optional.java
@@ -1,33 +1,14 @@
 /*
- * Copyright (c) 2012, 2022, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * Copyright 2023, Raccoons. Developing simple way to change.
  *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.  Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
+ * @license MIT
  */
 
 /*
  * @summary Refactored java.util.Optional
  * @author Oleksii Kucheruk
  */
-package co.raccoons.meeko;
+package co.raccoons.meeko.util;
 
 import java.util.NoSuchElementException;
 import java.util.Objects;
diff --git a/lib/src/main/java/co/raccoons/meeko/OptionalDouble.java b/lib/src/main/java/co/raccoons/meeko/util/OptionalDouble.java
similarity index 90%
rename from lib/src/main/java/co/raccoons/meeko/OptionalDouble.java
rename to lib/src/main/java/co/raccoons/meeko/util/OptionalDouble.java
index ab89449..91a956e 100644
--- a/lib/src/main/java/co/raccoons/meeko/OptionalDouble.java
+++ b/lib/src/main/java/co/raccoons/meeko/util/OptionalDouble.java
@@ -1,33 +1,14 @@
 /*
- * Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * Copyright 2023, Raccoons. Developing simple way to change.
  *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.  Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
+ * @license MIT
  */
 
 /*
  * @summary Refactored java.util.OptionalDouble
  * @author Oleksii Kucheruk
  */
-package co.raccoons.meeko;
+package co.raccoons.meeko.util;
 
 import java.util.NoSuchElementException;
 import java.util.Objects;
diff --git a/lib/src/main/java/co/raccoons/meeko/OptionalInt.java b/lib/src/main/java/co/raccoons/meeko/util/OptionalInt.java
similarity index 90%
rename from lib/src/main/java/co/raccoons/meeko/OptionalInt.java
rename to lib/src/main/java/co/raccoons/meeko/util/OptionalInt.java
index dbf998a..1152ef8 100644
--- a/lib/src/main/java/co/raccoons/meeko/OptionalInt.java
+++ b/lib/src/main/java/co/raccoons/meeko/util/OptionalInt.java
@@ -1,33 +1,14 @@
 /*
- * Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * Copyright 2023, Raccoons. Developing simple way to change.
  *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.  Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
+ * @license MIT
  */
 
 /*
  * @summary Refactored java.util.OptionalInt
  * @author Oleksii Kucheruk
  */
-package co.raccoons.meeko;
+package co.raccoons.meeko.util;
 
 import java.util.NoSuchElementException;
 import java.util.Objects;
diff --git a/lib/src/main/java/co/raccoons/meeko/OptionalLong.java b/lib/src/main/java/co/raccoons/meeko/util/OptionalLong.java
similarity index 90%
rename from lib/src/main/java/co/raccoons/meeko/OptionalLong.java
rename to lib/src/main/java/co/raccoons/meeko/util/OptionalLong.java
index 6da37dd..be3014f 100644
--- a/lib/src/main/java/co/raccoons/meeko/OptionalLong.java
+++ b/lib/src/main/java/co/raccoons/meeko/util/OptionalLong.java
@@ -1,33 +1,14 @@
 /*
- * Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * Copyright 2023, Raccoons. Developing simple way to change.
  *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.  Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
+ * @license MIT
  */
 
 /*
  * @summary Refactored java.util.OptionalLong
  * @author Oleksii Kucheruk
  */
-package co.raccoons.meeko;
+package co.raccoons.meeko.util;
 
 import java.util.NoSuchElementException;
 import java.util.Objects;
diff --git a/lib/src/main/java/co/raccoons/meeko/package-info.java b/lib/src/main/java/co/raccoons/meeko/util/package-info.java
similarity index 62%
rename from lib/src/main/java/co/raccoons/meeko/package-info.java
rename to lib/src/main/java/co/raccoons/meeko/util/package-info.java
index 823f92d..4cb9111 100644
--- a/lib/src/main/java/co/raccoons/meeko/package-info.java
+++ b/lib/src/main/java/co/raccoons/meeko/util/package-info.java
@@ -5,6 +5,6 @@
  */
 
 /**
- * Meeko package
+ * Meeko Java utilities.
  */
-package co.raccoons.meeko;
+package co.raccoons.meeko.util;
diff --git a/lib/src/main/proto/raccoons/Person.proto b/lib/src/main/proto/raccoons/Person.proto
new file mode 100644
index 0000000..bae2c10
--- /dev/null
+++ b/lib/src/main/proto/raccoons/Person.proto
@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package raccoons;
+
+message Person {
+  optional string name = 1;
+  optional int32 id = 2;
+  optional string email = 3;
+}
diff --git a/lib/src/test/java/co/raccoons/meeko/OptionalDoubleTest.java b/lib/src/test/java/co/raccoons/meeko/OptionalDoubleTest.java
index 0c221a2..8284933 100644
--- a/lib/src/test/java/co/raccoons/meeko/OptionalDoubleTest.java
+++ b/lib/src/test/java/co/raccoons/meeko/OptionalDoubleTest.java
@@ -30,6 +30,7 @@
  */
 package co.raccoons.meeko;
 
+import co.raccoons.meeko.util.OptionalDouble;
 import org.testng.annotations.Test;
 
 import java.util.NoSuchElementException;
diff --git a/lib/src/test/java/co/raccoons/meeko/OptionalIntTest.java b/lib/src/test/java/co/raccoons/meeko/OptionalIntTest.java
index 0e2c757..619b1e1 100644
--- a/lib/src/test/java/co/raccoons/meeko/OptionalIntTest.java
+++ b/lib/src/test/java/co/raccoons/meeko/OptionalIntTest.java
@@ -30,6 +30,7 @@
  */
 package co.raccoons.meeko;
 
+import co.raccoons.meeko.util.OptionalInt;
 import org.testng.annotations.Test;
 
 import java.util.NoSuchElementException;
diff --git a/lib/src/test/java/co/raccoons/meeko/OptionalLongTest.java b/lib/src/test/java/co/raccoons/meeko/OptionalLongTest.java
index f8f5dda..2da07e1 100644
--- a/lib/src/test/java/co/raccoons/meeko/OptionalLongTest.java
+++ b/lib/src/test/java/co/raccoons/meeko/OptionalLongTest.java
@@ -30,6 +30,7 @@
  */
 package co.raccoons.meeko;
 
+import co.raccoons.meeko.util.OptionalLong;
 import org.testng.annotations.Test;
 
 import java.util.NoSuchElementException;
diff --git a/lib/src/test/java/co/raccoons/meeko/OptionalTest.java b/lib/src/test/java/co/raccoons/meeko/OptionalTest.java
index dc07012..f9e4ad9 100644
--- a/lib/src/test/java/co/raccoons/meeko/OptionalTest.java
+++ b/lib/src/test/java/co/raccoons/meeko/OptionalTest.java
@@ -30,6 +30,7 @@
  */
 package co.raccoons.meeko;
 
+import co.raccoons.meeko.util.Optional;
 import org.testng.annotations.Test;
 
 import java.util.List;