Oracle.net.ns.NetException:NL Exception was generated____oracle

These two days modified the following database configuration file, the results of the following error message background, as follows (mainly concerned about the red part)

Org.springframework.jdbc.support.MetaDataAccessException:Error while extracting DatabaseMetaData; Nested exception is org.apache.commons.dbcp.SQLNestedException:Cannot create Poolableconnectionfactory (NL exception was generated) at Org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData (jdbcutils.java:296)
At Org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData (jdbcutils.java:320)
At Org.springframework.jdbc.support.SQLErrorCodesFactory.getErrorCodes (sqlerrorcodesfactory.java:216)
At Org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.setDataSource ( sqlerrorcodesqlexceptiontranslator.java:140)
At Org.springframework.jdbc.support.sqlerrorcodesqlexceptiontranslator.<init> ( sqlerrorcodesqlexceptiontranslator.java:103)
At Org.springframework.jdbc.support.JdbcAccessor.getExceptionTranslator (jdbcaccessor.java:99)
At Org.springframework.orm.ibatis.SqlMapClientTemplate.execute (sqlmapclienttemplate.java:212)
At Org.springframework.orm.ibatis.SqlMapClientTemplate.executeWithListResult (sqlmapclienttemplate.java:249)
At Org.springframework.orm.ibatis.SqlMapClientTemplate.queryForList (sqlmapclienttemplate.java:296)
......
At Java.lang.Thread.run (thread.java:736)
caused By:org.apache.commons.dbcp.SQLNestedException:Cannot create poolableconnectionfactory (NL Exception was Generated)
At Org.apache.commons.dbcp.BasicDataSource.createDataSource (basicdatasource.java:855)
At Org.apache.commons.dbcp.BasicDataSource.getConnection (basicdatasource.java:540)
At Org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection (datasourceutils.java:113)
At Org.springframework.jdbc.datasource.transactionawaredatasourceproxy$transactionawareinvocationhandler.invoke (transactionawaredatasourceproxy.java:210)
At $Proxy 107.getMetaData (Unknown Source)
At Org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData (jdbcutils.java:285)
... More
caused By:java.sql.SQLException:NL Exception was generated
At Oracle.jdbc.driver.SQLStateMapping.newSQLException (sqlstatemapping.java:70)
At Oracle.jdbc.driver.DatabaseError.newSQLException (databaseerror.java:133)
At Oracle.jdbc.driver.DatabaseError.throwSqlException (databaseerror.java:199)
At Oracle.jdbc.driver.DatabaseError.throwSqlException (databaseerror.java:480)
At Oracle.jdbc.driver.T4CConnection.logon (t4cconnection.java:413)
At Oracle.jdbc.driver.physicalconnection.<init> (physicalconnection.java:508)
At Oracle.jdbc.driver.t4cconnection.<init> (t4cconnection.java:203)
At Oracle.jdbc.driver.T4CDriverExtension.getConnection (t4cdriverextension.java:33)
At Oracle.jdbc.driver.OracleDriver.connect (oracledriver.java:510)
At Org.apache.commons.dbcp.DriverConnectionFactory.createConnection (driverconnectionfactory.java:37)
At Org.apache.commons.dbcp.PoolableConnectionFactory.makeObject (poolableconnectionfactory.java:290)
At Org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory (basicdatasource.java:877)
At Org.apache.commons.dbcp.BasicDataSource.createDataSource (basicdatasource.java:851)
... More
caused By:oracle.net.ns.NetException:NL Exception was generated
At Oracle.net.resolver.AddrResolution.resolveAddrTree (addrresolution.java:613)
At Oracle.net.resolver.AddrResolution.resolveAndExecute (addrresolution.java:410)
At Oracle.net.ns.NSProtocol.establishConnection (nsprotocol.java:634)
At Oracle.net.ns.NSProtocol.connect (nsprotocol.java:208)
At Oracle.jdbc.driver.T4CConnection.connect (t4cconnection.java:966)
At Oracle.jdbc.driver.T4CConnection.logon (t4cconnection.java:292)

... More

In fact, this error occurred, mainly in the database configuration file URL string errors caused . Carefully check the URL string, the problem is basically resolved.

The following is a URL string that can be run:

oracle.url=jdbc:oracle:thin:@ (description= address_list= (Load_balance=off) (Failover=on) (address= (PROTOCOL=TCP) (host=192.168.1.12) (port=1521)) (Address= (PROTOCOL=TCP) (host=192.168.1.15) (port=1521)) (Connect_data= (SERVICE_NAME=ORCL) (Failover_mode= (Type=select) (Method=basic)))