How to Set the Proxy to Be Used by the Jvm

How do I set the proxy to be used by the JVM

From the Java documentation (not the javadoc API):

http://download.oracle.com/javase/6/docs/technotes/guides/net/proxies.html

Set the JVM flags http.proxyHost and http.proxyPort when starting your JVM on the command line.
This is usually done in a shell script (in Unix) or bat file (in Windows). Here's the example with the Unix shell script:

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

When using containers such as JBoss or WebLogic, my solution is to edit the start-up scripts supplied by the vendor.

Many developers are familiar with the Java API (javadocs), but many times the rest of the documentation is overlooked. It contains a lot of interesting information: http://download.oracle.com/javase/6/docs/technotes/guides/

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Update : If you do not want to use proxy to resolve some local/intranet hosts, check out the comment from @Tomalak:

Also don't forget the http.nonProxyHosts property!

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

Setting JVM/JRE to use Windows Proxy Automatically

It is possible to detect the proxy using the ProxySelector class and assign the system proxy by assigning environment variables with the setProperty method of the System class:

System.setProperty("java.net.useSystemProxies", "true");
System.out.println("detecting proxies");
List l = null;
try {
    l = ProxySelector.getDefault().select(new URI("http://foo/bar"));
} 
catch (URISyntaxException e) {
    e.printStackTrace();
}
if (l != null) {
    for (Iterator iter = l.iterator(); iter.hasNext();) {
        java.net.Proxy proxy = (java.net.Proxy) iter.next();
        System.out.println("proxy type: " + proxy.type());

        InetSocketAddress addr = (InetSocketAddress) proxy.address();

        if (addr == null) {
            System.out.println("No Proxy");
        } else {
            System.out.println("proxy hostname: " + addr.getHostName());
            System.setProperty("http.proxyHost", addr.getHostName());
            System.out.println("proxy port: " + addr.getPort());
            System.setProperty("http.proxyPort", Integer.toString(addr.getPort()));
        }
    }
}

HTTP Proxy Setup For Java JVM

Thanks to bmargulies and anyone else who looked at this. I have a solution that I hope will help someone else.

Adding -Dhttp.proxyHost parameters to my JVM startup options did nothing.

Adding those same parameters to JBOSS 5.1.2 configuration in my deployment properties-services.xml did nothing.

I believe that using Spring 3.x is a factor in explaining this behavior. I had to tell the Spring web service clients to use a proxy.

I added some Spring beans to wire in a Fiddler proxy HttpClient and injected that into the web service client, replacing the non-proxied version.

It failed the first time I tried it. It took me a while to figure out that the Apache Commons HttpConfiguration class didn’t follow the Java bean standard, so Spring blew up when it tried to wire it. I had to use the Spring MethodInvokingFactoryBean to get around it.

Here's the pertinent Spring configuration XML:

<!-- New beans for Fiddler proxy -->
<bean id="fiddlerProxyHost" class="org.apache.commons.httpclient.ProxyHost">
    <constructor-arg name="hostname" value="localhost"/>
    <constructor-arg name="port" value="8888"/>
</bean>

<bean id="fiddlerProxyHostConfiguration" class="org.apache.commons.httpclient.HostConfiguration"/>

<bean id="fiddlerProxyHostSetter" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetObject" ref="fiddlerProxyHostConfiguration"/>
    <property name="targetMethod" value="setProxyHost"/>
    <property name="arguments" ref="fiddlerProxyHost"/>
</bean>

<bean id="fiddlerProxyClient" class="org.apache.commons.httpclient.HttpClient">
    <property name="hostConfiguration" ref="fiddlerProxyHostConfiguration"/>
</bean>

Now I can see the calls from the application to the web service in Fiddler. Joy!

How to configure proxy settings for Java?

The Sun (er, Oracle) Java SE 6 Java Networking and Proxies page covers these properties.

System proxy setting, Java

From source code we can use

System.getProperties().put("http.proxyHost", "ProxyURL");
System.getProperties().put("http.proxyPort", "ProxyPort");
System.getProperties().put("http.proxyUser", "UserName");
System.getProperties().put("http.proxyPassword", "Password");

Command Line :

  $> java -Dhttp.proxyHost=proxyhostURL -Dhttp.proxyPort=proxyPortNumber
-Dhttp.proxyUser=UserName -Dhttp.proxyPassword=Password ProxyClassHere

Document

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