Added additional guards

Author: marcingrzejszczak

.github/workflows/train-release-workflow.yml

@@ -35,5 +35,7 @@ jobs:
           spring_release_gchat_webhook_url: ${{ secrets.SPRING_RELEASE_GCHAT_WEBHOOK_URL }}
           bluesky_handle: ${{ secrets.BLUESKY_HANDLE }}
           bluesky_password: ${{ secrets.BLUESKY_PASSWORD }}
-          train_versions: ${{ github.event.inputs.train_versions }}
-          artifact_to_check: ${{ github.event.inputs.artifact_to_check }}
+          context_propagation_versions: ${{ github.event.inputs.context_propagation_versions }}
+          micrometer_versions: ${{ github.event.inputs.micrometer_versions }}
+          tracing_versions: ${{ github.event.inputs.tracing_versions }}
+          docs_gen_versions: ${{ github.event.inputs.docs_gen_versions }}

src/main/java/io/micrometer/release/train/TrainOptions.java

@@ -23,6 +23,10 @@ public class TrainOptions {
 
     public ProjectSetup parse(String ghOrgRepo, String contextPropagationVersions, String micrometerVersions,
             String tracingVersions, String docsGenVersions) {
+        if (!hasText(contextPropagationVersions) && !hasText(micrometerVersions) && !hasText(tracingVersions)
+                && !hasText(docsGenVersions)) {
+            throw new IllegalStateException("At least one st of versions must be set...");
+        }
         List<ProjectWithDependencies> projects = new ArrayList<>();
         String[] contextPropagationVersion = split(contextPropagationVersions);
         parseContextPropagation(contextPropagationVersion, projects);

src/test/java/io/micrometer/release/train/TrainOptionsTests.java

@@ -1,21 +1,20 @@
 /**
  * Copyright 2025 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * <p>
  * https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
  */
 package io.micrometer.release.train;
 
 import io.micrometer.release.train.TrainOptions.ProjectSetup;
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
@@ -25,11 +24,18 @@
 
 import static io.micrometer.release.train.TrainOptions.Project.*;
 import static org.assertj.core.api.BDDAssertions.then;
+import static org.assertj.core.api.BDDAssertions.thenThrownBy;
 
 class TrainOptionsTests {
 
     TrainOptions trainOptions = new TrainOptions();
 
+    @Test
+    void should_throw_exception_for_no_versions() {
+        thenThrownBy(() -> trainOptions.parse("foo", "", null, "", null)).isInstanceOf(IllegalStateException.class)
+            .hasMessage("At least one st of versions must be set...");
+    }
+
     @ParameterizedTest(name = "ghOrg <{0}>, contextProp <{1}>, microm <{2}>, tracing <{3}>, docsGen <{4}>")
     @MethodSource("should_parse_entries_to_project_setup_args")
     void should_parse_entries_to_project_setup(String ghOrg, String contextPropagationVersions,