Remove Rule-related classes

java/build.gradle.kts

@@ -24,22 +24,14 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-import io.spine.dependency.lib.JavaPoet
-import io.spine.dependency.lib.Roaster
 import io.spine.dependency.local.ProtoData
 
 plugins {
     `build-proto-model`
 }
 
 dependencies {
+    api(ProtoData.java)
     api(project(":model"))
     api(project(":proto:context"))
-    api(ProtoData.java)
-
-    implementation(project(":java-runtime"))
-    implementation(JavaPoet.lib)
-    implementation(Roaster.api)
-
-    runtimeOnly(Roaster.jdt)
 }

java/src/main/kotlin/io/spine/validation/java/JavaValidationRenderer.kt

@@ -51,7 +51,6 @@ import io.spine.validation.java.generate.option.RequireOptionGenerator
 import io.spine.validation.java.generate.option.RequiredGenerator
 import io.spine.validation.java.generate.option.ValidateGenerator
 import io.spine.validation.java.generate.option.WhenGenerator
-import io.spine.validation.java.rule.RuleGenerator
 
 /**
  * The main Java renderer of the validation library.
@@ -66,7 +65,6 @@ public class JavaValidationRenderer : JavaRenderer() {
     private val querying = this@JavaValidationRenderer
     private val generators by lazy {
         listOf(
-            RuleGenerator(querying, typeSystem),
             RequiredGenerator(querying, valueConverter),
             PatternGenerator(querying),
             GoesGenerator(querying, valueConverter),

java/src/main/kotlin/io/spine/validation/java/generate/ValidationCodeInjector.kt

@@ -93,7 +93,6 @@ internal class ValidationCodeInjector {
         execute {
             messageClass.apply {
                 implementValidatableMessage()
-                declareDefaultValidateMethod()
                 declareValidateMethod(code.constraints)
                 declareSupportingFields(code.fields)
                 declareSupportingMethods(code.methods)
@@ -133,28 +132,6 @@ private fun MessagePsiClass.implementValidatableMessage() {
     implement(reference)
 }
 
-/**
- * Declares the `validate()` method in this [MessagePsiClass].
- *
- * This is an implementation of [ValidatableMessage.validate] that doesn't accept
- * any parameters. The actual constraints are contained in its [overload][declareValidateMethod],
- * to which this method delegates.
- */
-// TODO:2025-03-12:yevhenii.nadtochii: Remove it in a favour of the default implementation
-//  provided in the `ValidatableMessage` interface.
-//  See issue: https://github.com/SpineEventEngine/validation/issues/198
-private fun MessagePsiClass.declareDefaultValidateMethod() {
-    val psiMethod = elementFactory.createMethodFromText(
-        """
-        public java.util.Optional<io.spine.validate.ValidationError> validate() {
-            var noParentPath = $FieldPathClass.getDefaultInstance();
-            return validate(noParentPath, null);
-        }
-        """.trimIndent(), this)
-    psiMethod.annotate(Override::class.java)
-    addLast(psiMethod)
-}
-
 /**
  * Declares the `validate(parentPath, parentName)` method in this [MessagePsiClass].
  *