fabriziofortino commented on code in PR #2922:
URL: https://github.com/apache/jackrabbit-oak/pull/2922#discussion_r3324772931


##########
oak-run-commons/src/test/java/org/apache/jackrabbit/oak/run/cli/TikaExclusionTest.java:
##########
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ *      http://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.
+ */
+package org.apache.jackrabbit.oak.run.cli;
+
+import org.junit.Test;
+
+import static org.junit.Assert.fail;
+
+/**
+ * Verifies that tika-core is not transitively available in oak-run-commons.
+ *
+ * oak-run-commons depends on jackrabbit-core, which declares tika-core as a
+ * transitive dependency. The exclusion in the jackrabbit-core dependency block
+ * in pom.xml is required to prevent tika-core from leaking onto the classpath
+ * (and ultimately into the assembled oak-run and oak-run-elastic JARs at a
+ * version that may differ from the one declared in oak-parent).
+ *
+ * If this test fails it means tika-core is reachable via jackrabbit-core's
+ * transitive dependencies. Restore the tika-core exclusion in the
+ * jackrabbit-core dependency in oak-run-commons/pom.xml.
+ */
+public class TikaExclusionTest {
+
+    @Test
+    public void tikaCoreNotTransitivelyAvailable() {
+        try {
+            Class.forName("org.apache.tika.Tika");
+            fail("tika-core must not be on oak-run-commons's classpath; " +
+                    "check that the tika-core exclusion is present in the 
jackrabbit-core dependency in pom.xml");
+        } catch (ClassNotFoundException expected) {
+            // correct: tika-core is excluded from jackrabbit-core's 
transitive deps
+        }
+    }

Review Comment:
   I think this is more idiomatic:
   
   ```suggestion
       @Test
       public void tikaCoreNotTransitivelyAvailable() {
           assertThrows(
               ClassNotFoundException.class,
               () -> Class.forName("org.apache.tika.Tika"),
               "tika-core must not be on oak-run-commons's classpath. " +
                  "Ensure the tika-core exclusion is present in the 
jackrabbit-core dependency in pom.xml"
       );
   }
   ```



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