JSR-354 java moneta指定代理

我试图用Moneta API执行货币转换，因此我称之为：

MonetaryConversions.getExchangeRateProvider("IDENT", "ECB", "IMF", "ECB-HIST", "ECB-HIST90").getExchangeRate(sourceCurrency, targetCurrency);

不幸的是，我得到了这个例外：

2016-06-15 17:14:12,659 [main] ERROR: Failed to load resource:  IMFHistoricRateProvider
java.lang.IllegalStateException: Failed to load remote as well as fallback resources for LoadableResource [resourceId=IMFHistoricRateProvider, fallbackLocation=jar:file:/C:/Users/e-tahchpet/.m2/repository/org/javamoney/moneta/1.1/moneta-1.1.jar!/java-money/defaults/IMF/rms_five.xls, remoteResources=[http://www.imf.org/external/np/fin/data/rms_five.aspx?tsvflag=Y], loadCount=0, accessCount=1, lastLoaded=0]
    at org.javamoney.moneta.internal.loader.LoadableResource.getData(LoadableResource.java:378)

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我很确定这是因为我在公司防火墙后面。有没有办法指定代理？Myabe在某个属性文件中？

实际上，我发现通过指定

http.proxyHost

和

http.proxyPort

系统属性是可能的