[SAP]JCO连接错误配置日志之错误登录语言

在设置了未知或系统不能识别的语言（DestinationDataProvider.JCO_LANG ,jco.client.lang）时，报错：

com.sap.conn.jco.JCoException: (101) RFC_ERROR_PROGRAM: Language 'xx' is not available
	at com.sap.conn.jco.rt.MiddlewareJavaRfc.generateJCoException(MiddlewareJavaRfc.java:615)
	at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcClient.initialize(MiddlewareJavaRfc.java:1243)
	at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcClient.connect(MiddlewareJavaRfc.java:1268)
	at com.sap.conn.jco.rt.ClientConnection.connect(ClientConnection.java:661)
	at com.sap.conn.jco.rt.PoolingFactory.init(PoolingFactory.java:103)
	at com.sap.conn.jco.rt.ConnectionManager.createFactory(ConnectionManager.java:171)
	at com.sap.conn.jco.rt.DefaultConnectionManager.createFactory(DefaultConnectionManager.java:44)
	at com.sap.conn.jco.rt.ConnectionManager.getFactory(ConnectionManager.java:160)
	at com.sap.conn.jco.rt.RfcDestination.initialize(RfcDestination.java:789)
	at com.sap.conn.jco.rt.RfcDestination.ping(RfcDestination.java:1002)

Caused by: 
RfcException: [null]
    message: Language 'xx' is not available
    Return code: RFC_FAILURE(1)
    error group: 101
    key: RFC_ERROR_PROGRAM
	at com.sap.conn.rfc.api.RfcOptions.setLanguage(RfcOptions.java:890)
	at com.sap.conn.rfc.api.RfcOptions.setProperties(RfcOptions.java:477)
	at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcClient.initialize(MiddlewareJavaRfc.java:1238)
	... 32 more