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Cannot login into Salesforce with Java using Proxy Server

I wrote Java code to login to Salesforce and ran this code on a firewalled server. For this, I have to specify the proxy url and proxy port before connecting to Salesforce due to the firewall. However, I'm getting an unknownhostexception error for the proxy url. If I try to login via curl with the proxy settings, I am able to connect. How come there is a problem connecting using Java then? Any help is appreciated.

Apparently the issue was caused by JVM configs. We have to configure JVM to use the proxy settings as follows:
System.setProperty("http.proxyHost", crmProxyURL);
System.setProperty("http.proxyPort", crmProxyPort);

Depending on your HTTP library the System settings might not be enough or not needed. In the Salesforce context it is quite possible that one would try using the Jetty HTTP Client. In this case the System properties are ignored and proxy needs to be handled by the Jetty client:
ProxyConfiguration proxyConfig = httpClient.getProxyConfiguration();
HttpProxy proxy = new HttpProxy("proxyHost", proxyPort);
proxyConfig.getProxies().add(proxy);
The Apache HTTP Client, another popular choice, also uses its own little mechanism:
HttpHost proxy = new HttpHost("proxyHost", proxyPort, "https");
RequestConfig config = RequestConfig.custom().setProxy(proxy).build();
HttpGet request = new HttpGet(someURL);
request.setConfig(config);
Interesting here: one can specify to use http or https as the proxy protocol.
In general I found using one of the http client much easier that the JDK low level functions.

Jersey Client gives read timeout but Apache HTTP Client connects normally

I was using Jersey 2.25 client with Jackson, I configured everything correctly in Jersey, it worked normally on my development machine when I ran it in a test class, but Jersey client could never connect to a certain host that we have when deployed on our STG environment and always throws a read timeout exception.
I also know that the problem is not in our environment because I can connect using curl
But when switched to HTTPClient it worked normally.
This is how we created our Jersey Client:
Client client = ClientBuilder.newBuilder()
.register(JacksonFeature.class)
.property(ClientProperties.CONNECT_TIMEOUT,5000)
.property(ClientProperties.READ_TIMEOUT,15000)
.build();
The only difference here is the flow of the app, and also the major change that happens in the flow that could affect the connection is that somewhere before calling the Jersey client another class sets a proxy in the system config:
System.setProperty("http.proxyHost",strProxyHost);
System.setProperty("http.proxyPort",strProxyPort);
System.setProperty("https.proxyHost",strProxyHost);
System.setProperty("https.proxyPort",strProxyPort);
However we can establish a connection normally using HTTPClient:
HttpConnectionManagerParams params = new HttpConnectionManagerParams();
params.setConnectionTimeout(5000);
params.setSoTimeout(10000);
HttpConnectionManager manager = new SimpleHttpConnectionManager();
manager.setParams(params);
HttpClient httpClient = new HttpClient(manager);
We are using HTTPClient 3 because part of this app is legacy and we cannot update the version, but it works normally.
What could be causing this connection problem with Jersey? is there something global that Jersey reads when it's trying to connect?

Jersey by default uses HttpURLConnection and HttpURLConnection uses following global settings for proxy configuration -
System.setProperty("http.proxyHost",strProxyHost);
System.setProperty("http.proxyPort",strProxyPort);
System.setProperty("https.proxyHost",strProxyHost);
System.setProperty("https.proxyPort",strProxyPort);
It means if these system variables are set, Jersey will send all the requests through this configured proxy. Check Details here
However, Apache HttpClient does not follow these settings. For using proxy in Apache HttpClient, you have to use HostConfiguration class. Check details here
So, now to your problem, It looks that your STG environment is not able to connect to specified proxy but able to connect with the service directly.
So, while using Jersey, client is not able to connect to proxy and hence ReadTimeoutException is occurring. Since, you haven't configured HttpClient for using any proxy, it is able to connect with the service directly.

Spring-Boot behind a network proxy

I am currently implementing an OpenID authentication based on this example. Now I am developing behind a network proxy, therefore the server cannot connect to google. The java proxy settings seem to not have any effect. I also found this stackoverflow question, but I cannot figure out where to put the code. How can I configure the proxy for my spring boot container?
thanks

Not sure if this is of any use, but I'm just working through a Spring Boot tutorial currently (https://spring.io/guides/gs/integration/) and hit a similar network proxy issue. This was resolved just by providing the JVM arguments
-Dhttp.proxyHost=your.proxy.net -Dhttp.proxyPort=8080

Adding just the two provided arguments didn't work for me.
Full list that did it is this:
-Dhttp.proxyHost=somesite.com -Dhttp.proxyPort=4321
-Dhttps.proxyHost=somesite.com -Dhttps.proxyPort=4321 -Dhttps.proxySet=true
-Dhttp.proxySet=true

If you need this to make a call to an external service, then try to set proxy to the Client you are using (RestTemplate, etc), as below:
HttpComponentsClientHttpRequestFactory requestFactory = new
HttpComponentsClientHttpRequestFactory();
DefaultHttpClient httpClient = (DefaultHttpClient) requestFactory.getHttpClient();
HttpHost proxy = new HttpHost("proxtserver", port);
httpClient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,proxy);
restTemplate.setRequestFactory(requestFactory);

For me, server.use-forwarded-headers=true in application.properties solved the problem.

I could able to solve the problem in two methods
Through JVM args (both http & https)
-Dhttp.proxyHost=your-http-proxy-host -Dhttp.proxyPort=8080
-Dhttps.proxyHost=your-https-proxy-host -Dhttps.proxyPort=8080
Or Programatically
public static void setProxy() {
System.setProperty("http.proxyHost", "your-http-proxy-host");
System.setProperty("http.proxyPort", "8080");
System.setProperty("https.proxyHost", "your-http-proxy-host");
System.setProperty("https.proxyPort", "8080");
}

How to configure java rome fetcher for use with a proxy and authentication

I'm trying to use java rome-fetcher to acquire rss feeds for processing. Everything works fine when I have direct internet access.
However, I need to be able to run my application behind a proxy server.
I have been unable to figure out how this can be done with rome-fetcher.
I am aware of the jvm
System.setProperty("http.proxyHost", proxy);
System.setProperty("http.proxyPort", proxyPort);
hack, but that is not an option for reasons I don't really want to explain.
With HttpClient you typically do something like this.
DefaultHttpClient client = new DefaultHttpClient();
HttpHost proxyTarget = new HttpHost("proxy.server.com", 4444);
client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxyTarget);
Does anyone how to assign proxy settings, and authentication credentials for that matter, to rome-fetcher?

Setting http.proxyHost and http.proxyPort is the only option to use http proxy for Rome for the time being.

Because the System.setProperty(...) is the only proxy option for rome-fetcher I ended up downloading a copy of the rome-fetcher source and made modifications to the underlying http client so it can handle different proxy configurations.

Fetcher was deprecated in version 1.6 of Rome and will be removed in version 2.0:
https://github.com/rometools/rome/issues/276
One of the reasons given is that the user doesn't have full control over the underlying HTTP connection -- an example being the inability to specify a proxy. Directly using Apache HttpClient is suggested instead.

JAX-WS client authentication on proxy server

I'm trying to use JAX-WS api to send some soap messages on a client application. However, I'm behind a firewall and the only option is to use a proxy server to go outside.
I'm trying to find on google any answer about this and so far all fail: To Use System.setProperty for http.proxyHost, http.proxyPort, http.proxyUser, http.proxyPassword. To use Authenticator like is described here.
I'm running out of options, if someone could help me on this would be great.
Also, I have a option to use org.apache.commons.httpclient but then I need to generate manually the XML. So could you suggest any other approach or API for WS?

You can use ws import command when creating web client to configure proxy.
-httpproxy::
use above command to configure proxy.
How to do this depend on your IDE.
http://publib.boulder.ibm.com/infocenter/wasinfo/v6r1/index.jsp?topic=/com.ibm.websphere.wsfep.multiplatform.doc/info/ae/ae/rwbs_wsimport.html

For Jax-ws webservice client, use the following
//set proxy info to the ClientProxyFeature
ClientProxyFeature cpf = new ClientProxyFeature();
cpf.setProxyHost("proxyhost");
cpf.setProxyPort(8888);
cpf.setProxyUserName("proxyuser");
cpf.setProxyPassword("proxypwd");
//get the port with the Feature
MyPort port = myService.getPort(cpf);