fix: Catch retryable exceptions thrown by SDN itself. (#2945)

This fix #2944 by making the retryable exception messages consistent by introducing constants for prematurely closed transactions and sessions omitting the trailing dot as agreed within the bigger Spring Data team.

src/main/java/org/springframework/data/neo4j/core/support/RetryExceptionPredicate.java

@@ -26,6 +26,7 @@
 import org.neo4j.driver.exceptions.TransientException;
 import org.springframework.dao.TransientDataAccessResourceException;
 
+
 /**
  * A predicate indicating {@literal true} for {@link Throwable throwables} that can be safely retried and {@literal false}
  * in any other case. This predicate can be used for example with Resilience4j.
@@ -37,9 +38,12 @@
 @API(status = API.Status.STABLE, since = "6.0")
 public final class RetryExceptionPredicate implements Predicate<Throwable> {
 
+	public static final String TRANSACTION_MUST_BE_OPEN_BUT_HAS_ALREADY_BEEN_CLOSED = "Transaction must be open, but has already been closed";
+	public static final String SESSION_MUST_BE_OPEN_BUT_HAS_ALREADY_BEEN_CLOSED = "Session must be open, but has already been closed";
 	private static final Set<String> RETRYABLE_ILLEGAL_STATE_MESSAGES = Set.of(
-			"Transaction must be open, but has already been closed.",
-			"Session must be open, but has already been closed.");
+			TRANSACTION_MUST_BE_OPEN_BUT_HAS_ALREADY_BEEN_CLOSED,
+			SESSION_MUST_BE_OPEN_BUT_HAS_ALREADY_BEEN_CLOSED
+	);
 
 	@Override
 	public boolean test(Throwable throwable) {

src/main/java/org/springframework/data/neo4j/core/transaction/Neo4jTransactionHolder.java

@@ -22,6 +22,7 @@
 import org.neo4j.driver.Transaction;
 import org.springframework.data.neo4j.core.DatabaseSelection;
 import org.springframework.data.neo4j.core.UserSelection;
+import org.springframework.data.neo4j.core.support.RetryExceptionPredicate;
 import org.springframework.lang.Nullable;
 import org.springframework.transaction.support.ResourceHolderSupport;
 import org.springframework.util.Assert;
@@ -68,7 +69,7 @@ Transaction getTransaction(DatabaseSelection inDatabase, UserSelection asUser) {
 
 	Collection<Bookmark> commit() {
 
-		Assert.state(hasActiveTransaction(), "Transaction must be open, but has already been closed");
+		Assert.state(hasActiveTransaction(), RetryExceptionPredicate.TRANSACTION_MUST_BE_OPEN_BUT_HAS_ALREADY_BEEN_CLOSED);
 		Assert.state(!isRollbackOnly(), "Resource must not be marked as rollback only");
 
 		transaction.commit();
@@ -79,15 +80,15 @@ Collection<Bookmark> commit() {
 
 	void rollback() {
 
-		Assert.state(hasActiveTransaction(), "Transaction must be open, but has already been closed");
+		Assert.state(hasActiveTransaction(), RetryExceptionPredicate.TRANSACTION_MUST_BE_OPEN_BUT_HAS_ALREADY_BEEN_CLOSED);
 
 		transaction.rollback();
 		transaction.close();
 	}
 
 	void close() {
 
-		Assert.state(hasActiveSession(), "Session must be open, but has already been closed");
+		Assert.state(hasActiveSession(), RetryExceptionPredicate.SESSION_MUST_BE_OPEN_BUT_HAS_ALREADY_BEEN_CLOSED);
 
 		if (hasActiveTransaction()) {
 			transaction.close();

src/test/java/org/springframework/data/neo4j/core/support/RetryExceptionPredicateTest.java

@@ -34,8 +34,8 @@
 class RetryExceptionPredicateTest {
 
 	@ParameterizedTest
-	@ValueSource(strings = { "Transaction must be open, but has already been closed.",
-			"Session must be open, but has already been closed." })
+	@ValueSource(strings = { "Transaction must be open, but has already been closed",
+			"Session must be open, but has already been closed" })
 	void shouldRetryOnSomeIllegalStateExceptions(String msg) {
 
 		RetryExceptionPredicate predicate = new RetryExceptionPredicate();