Web Reference: Jul 24, 2023 · Connecting to Oracle can be extremely challenging, but this blog post aims to help you dissect all possible error messages in order to troubleshoot your connection issues. Here are the solutions to the connection issues. I’ve listed them briefly here, and more details are available below. 1. Ensure the Oracle Database is running 2. Use the correct SID or Service Name for Pluggable Databases 3. Login to the system accounts correctly 4. Passwords are case sensitive Caused by: oracle.ucp.UniversalConnectionPoolException: All connections in the Universal Connection Pool are in use at oracle.ucp.util.UCPErrorHandler.newUniversalConnectionPoolException(UCPErrorHandler.java:336)
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