java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after 30000ms.
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This is a bug in version 4.1.9 and it's fixed from version 4.3.0beta and beyond.
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java.sql.SQLException: ORA-04031: unable to allocate 80 bytes of shared memory ("large pool","unknown object","session heap","dbgdInitEventGrp: eventGrpI")
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:447)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:389)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:382)
at oracle.jdbc.driver.T4CTTIoauthenticate.processError(T4CTTIoauthenticate.java:444)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:513)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
at oracle.jdbc.driver.T4CTTIoauthenticate.doOSESSKEY(T4CTTIoauthenticate.java:407)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:416)
at oracle.jdbc.driver.PhysicalConnection.
(PhysicalConnection.java:553) at oracle.jdbc.driver.T4CConnection.
(T4CConnection.java:254) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:528)
at oracle.jdbc.pool.OracleDataSource.getPhysicalConnection(OracleDataSource.java:280)
at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:207)
at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:157)
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:316)
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:173)
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:443)
at com.zaxxer.hikari.pool.HikariPool.access$500(HikariPool.java:66)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:568)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:561)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)