How Do I Configure JVM Proxy Settings for Java Applications?

Setting the Proxy for the JVM

When Java applications require internet connectivity, they can encounter difficulties when behind a proxy server. To ensure successful network connections, it becomes necessary to configure the Java Virtual Machine (JVM) to use the proxy.

The Java documentation provides detailed instructions on how to configure the JVM proxy settings. Upon starting the JVM on the command line, developers can set the JVM flags http.proxyHost (host IP or name) and http.proxyPort (port). In Unix environments, this process can be facilitated by creating a shell script, as demonstrated in the example:

JAVA_FLAGS=-Dhttp.proxyHost=10.0.0.100 -Dhttp.proxyPort=8800
java ${JAVA_FLAGS} ...

In the case of containers like JBoss or WebLogic, developers can modify the start-up scripts provided by the vendor. It is important to note that the Java API (javadocs) offers only partial documentation, while the full documentation includes valuable information at http://download.oracle.com/javase/6/docs/technotes/guides/.

Developers may also want to exclude specific local or intranet hosts from proxy resolution. The http.nonProxyHosts property can be set for this purpose, as highlighted by @Tomalak:

-Dhttp.nonProxyHosts="localhost|127.0.0.1|10.*.*.*|*.example.com|etc"

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