downgrade to java 17

Author: krotname

pom.xml

@@ -15,8 +15,8 @@
                 <version>3.13.0</version>
                 <configuration>
                     <source>21</source>
-                    <target>21</target>
-                    <release>21</release>
+                    <target>17</target>
+                    <release>17</release>
                     <compilerArgs>--enable-preview</compilerArgs>
                 </configuration>
             </plugin>

src/main/java/transactions/InMemoryValidationServiceTest.java

@@ -41,7 +41,7 @@ void testValidBetTransaction() {
         ValidationResult result = service.validate(transactions, 100);
         List<TransactionStatus> statuses = result.getTransactions();
         assertEquals(1, statuses.size(), "There should be one transaction status");
-        assertTrue(statuses.getFirst().status(), "BET transaction should be valid when balance is sufficient");
+        assertTrue(statuses.get(0).status(), "BET transaction should be valid when balance is sufficient");
     }
 
     @Test
@@ -50,7 +50,7 @@ void testInvalidBetTransactionDueToInsufficientBalance() {
         ValidationResult result = service.validate(transactions, 100);
         List<TransactionStatus> statuses = result.getTransactions();
         assertEquals(1, statuses.size(), "There should be one transaction status");
-        assertFalse(statuses.getFirst().status(), "BET transaction should be invalid due to insufficient balance");
+        assertFalse(statuses.get(0).status(), "BET transaction should be invalid due to insufficient balance");
     }
 
     @Test