My Oracle Support Banner

JDBC Connection To Oracle RAC Fails With The Exception "Unknown host specified" (Doc ID 1161625.1)

Last updated on JULY 31, 2019

Applies to:

JDBC - Version 10.2.0.2 and later
Information in this document applies to any platform.

Symptoms

You are attempting to connect to a RAC database using a JDBC driver but get the exception "Unknown host specified" in your application error log.

Exception in thread "main" java.sql.SQLException: Io exception: Unknown host specified
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:441)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)

Changes

 

Cause

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!


In this Document
Symptoms
Changes
Cause
Solution


My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.