JDBC Connections Fail with ORA-12520
(Doc ID 2660207.1)
Last updated on FEBRUARY 26, 2024
Applies to:
JDBC - Version 10.2.0.5 and laterOracle Database - Enterprise Edition - Version 19.20.0.0.0 to 19.20.0.0.0 [Release 19]
Information in this document applies to any platform.
Symptoms
Application using JDBC 11.2.0.3 reports the following exception during connection to a 12.1.0.2 database :
oracle.net.ns.NetException: Listener refused the connection with the following error:
ORA-12520, TNS:listener could not find available handler for requested type of server
at oracle.net.ns.NSProtocolStream.negotiateConnection(NSProtocolStream.java:275)
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:264)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1452)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:496)
at oracle.jdbc.driver.PhysicalConnection.connect(PhysicalConnection.java:662)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:560)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
Also, TNS-12516 TNS:listener could not find instance with matching protocol stack may be reported.
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |
| References |