Java mail by SSL

如果没有设置证书，会出现以下Exception:

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Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

要解决这个问题，方法有两个：

  1. java的启动参数添加 -Djavax.net.ssl.trustStore=/path/to/jssecacerts
  2. Add properties in java code
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    Properties systemProps = System.getProperties(); 
    systemProps.put( "javax.net.ssl.trustStore", "/path/to/jssecerts"); 
    System.setProperties(systemProps);

参考：
http://www.rap.ucar.edu/staff/paddy/cacerts/index.html
http://code.google.com/p/java-use-examples/source/browse/trunk/src/com/aw/ad/util/InstallCert.java