Have you encountered difficulties or unforeseen situations during project integration or launch?

Yes, when integrating projects in Java, there are often difficulties related to incompatible library versions, dependency conflicts, and environment setup. For example, when connecting third-party modules, version conflicts may arise, leading to class loading errors (ClassNotFoundException or NoSuchMethodError). To resolve such issues, it is important to use dependency management systems like Maven or Gradle and to carefully monitor version compatibility.

Unforeseen situations can also occur due to differences in server or database configurations, which require additional setup and testing before deployment. It is important to conduct integration tests and have the ability to quickly rollback changes when errors are detected.