Fix: SentryTransaction#finish should not clear another transaction from the scope

CHANGELOG.md

@@ -14,6 +14,7 @@
 * Enchancement: Integration interface better compatibility with Kotlin null-safety
 * Enchancement: Simplify Sentry configuration in Spring integration (#1259)
 * Enchancement: Optimize SentryTracingFilter when hub is disabled.
+* Fix: SentryTransaction#finish should not clear another transaction from the scope (#1278)
 
 Breaking Changes:
 * Enchancement: SentryExceptionResolver should not send handled errors by default (#1248).

sentry/src/main/java/io/sentry/Hub.java

@@ -556,7 +556,10 @@ public void flush(long timeoutMillis) {
                   e);
         } finally {
           if (item != null) {
-            item.getScope().clearTransaction();
+            final Scope scope = item.getScope();
+            if (scope.getTransaction() == transaction) {
+              scope.clearTransaction();
+            }
           }
         }
       }

sentry/src/test/java/io/sentry/HubTest.kt

@@ -1028,18 +1028,38 @@ class HubTest {
     }
 
     @Test
-    fun `when captureTransaction, scope transaction is cleared`() {
+    fun `when transaction is set on scope, captureTransaction clears it from the scope`() {
         val options = SentryOptions()
         options.cacheDirPath = file.absolutePath
         options.dsn = "https://[email protected]/proj"
         options.setSerializer(mock())
         val sut = Hub(options)
 
-        sut.captureTransaction(SentryTransaction("name", "op"), null)
+        val transaction = SentryTransaction(TransactionContext("name", "op", true), sut)
+        sut.configureScope { it.setTransaction(transaction) }
+        sut.captureTransaction(transaction, null)
         sut.configureScope {
             assertNull(it.transaction)
         }
     }
+
+    @Test
+    fun `when different transaction is set on scope, captureTransaction does not clear it from the scope`() {
+        val options = SentryOptions()
+        options.cacheDirPath = file.absolutePath
+        options.dsn = "https://[email protected]/proj"
+        options.setSerializer(mock())
+        val sut = Hub(options)
+
+        val transaction = SentryTransaction(TransactionContext("name", "op", true), sut)
+        val anotherTransaction = SentryTransaction(TransactionContext("name", "op", true), sut)
+        sut.configureScope { it.setTransaction(anotherTransaction) }
+        sut.captureTransaction(transaction, null)
+        sut.configureScope {
+            assertNotNull(it.transaction)
+            assertEquals(anotherTransaction, it.transaction)
+        }
+    }
     //endregion
 
     //region startTransaction tests