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java.sql.SQLException: ORA-01460: unimplemented or unreasonable conversion requested
	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125)
	at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:305)
	at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:272)
	at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:623)
	at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:181)
	at oracle.jdbc.driver.T4CPreparedStatement.execute_for_describe(T4CPreparedStatement.java:420)
	at oracle.jdbc.driver.OracleStatement.execute_maybe_describe(OracleStatement.java:896)
	at oracle.jdbc.driver.T4CPreparedStatement.execute_maybe_describe(T4CPreparedStatement.java:452)
	at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:986)
	at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:2888)
	at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:2929)
	at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

解决方法：将你连接的oracle数据库的驱动包放到你的lib下，更新了oracle驱动包就可以了。