Tunneling all Java connections through a proxy server

If you’re behind your company’s proxy server and want to connect a Java application via TCP to another server you must provide the proxy configuration to your connection objects. Unfortunately you cannot configure many high-level objects in that way so you might want to set the proxy settings application wide. To achieve that you can simply change System.Properties on the fly. I used a simple static { } codeblock in one of my connection classes to ensure that the properties are set before any connection will be opened. Here’s some code:

System.setProperty("http.proxyHost", "proxy.host.com");
System.setProperty("http.proxyPort", "8080");

For more complicated usage scenarios you’ll find lots of best practices in the official document:


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