Sessionless transactions demo (#442)

* Sessionless transactions demo

* Rollback if start transaction request fails

* Remove DTO suffix

* Remove fixme

* Update copyright

* Add concurrency tests

Author: meedbek

java/jdbc/SessionlessTransactions/.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

java/jdbc/SessionlessTransactions/LICENSE.txt

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+Copyright (c) 2025 Oracle and/or its affiliates.
+
+The Universal Permissive License (UPL), Version 1.0
+
+Subject to the condition set forth below, permission is hereby granted to any
+person obtaining a copy of this software, associated documentation and/or data
+(collectively the "Software"), free of charge and under any and all copyright
+rights in the Software, and any and all patent rights owned or freely
+licensable by each licensor hereunder covering either (i) the unmodified
+Software as contributed to or provided by such licensor, or (ii) the Larger
+Works (as defined below), to deal in both
+
+(a) the Software, and
+(b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+one is included with the Software (each a "Larger Work" to which the Software
+is contributed by such licensors),
+
+without restriction, including without limitation the rights to copy, create
+derivative works of, display, perform, and distribute the Software and make,
+use, sell, offer for sale, import, export, have made, and have sold the
+Software and the Larger Work(s), and to sublicense the foregoing rights on
+either these or other terms.
+
+This license is subject to the following condition:
+The above copyright notice and either this complete permission notice or at
+a minimum a reference to the UPL must be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

java/jdbc/SessionlessTransactions/README.md

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+## Overview
+
+This project demonstrates the use of sessionless transactions feature of Oracle Database using JDBC.
+
+The project is a web service that handles booking requests.
+
+## Building and testing
+
+Create a test user:
+
+~~~SQL
+CREATE USER test_user IDENTIFIED BY test_password;
+GRANT CREATE SESSION TO test_user;
+GRANT CREATE TABLE TO test_user;
+GRANT CREATE SEQUENCE TO test_user;
+GRANT DROP ANY TABLE TO test_user;
+GRANT UNLIMITED TABLESPACE TO test_user;
+~~~
+
+Please set the database URL as an environment variable before running the application.
+
+**Example:**
+~~~
+export TEST_DATABASE_URL=jdbc:oracle:thin:@localhost:5221:orcl
+~~~
+
+**Build and run endpoint tests:**
+~~~
+mvn install
+~~~