Web Reference: Apr 28, 2025 · Java Database Connectivity (JDBC) serves as the backbone for Java applications when interacting with databases. While establishing connections and executing queries, we developers often encounter SQLExceptions, which are inevitable in the real world. Constructs a SQLException object with a given reason, SQLState and vendorCode. The cause is not initialized, and may subsequently be initialized by a call to the Throwable.initCause(java.lang.Throwable) method. But got the below error: java.sql.SQLException: Io exception: Unknown host specified. How do I specify the connection string ? https://docs.oracle.com/cd/E11882_01/appdev.112/e13995/oracle/jdbc/OracleDriver.html. Path is wrong Just run this: jdbc:oracle:thin://@serverName:portNumber/databaseName.
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