Hello,
I'm having a similar issue where my servlet can not reach a URL within
my company's intranet. My company has a proxy and firewall, but I've
written other servlets that don't have any issue reaching URLs on my
intranet. It's possible that gwt requires me to manually specify a
proxy, but I've noticed trying to use the java.net.Proxy class is
unsupported by appengine, and was wondering if anyone had other
methods of connecting. I will paste the code below, with the
exception. I've tried this in development mode and I've tried creating
a war and posting it to my company's sunone server. No luck either
way.
System.setProperty("http.proxyHost", "my-company-proxy");
System.setProperty("http.proxyPort", "80");
String urlStr = "http://my-company-intranet.com";;
try
{
StringWriter content = new StringWriter();
URL url = new URL(urlStr);
// Proxy proxy = new Proxy(Proxy.Type.HTTP, new
InetSocketAddress("my-company-proxy.com", 80));
URLConnection spoof = url.openConnection();
InputStream i = spoof.getInputStream();
spoof.setRequestProperty("User-Agent", "Mozilla/4.0
(compatible; MSIE 5.5; Windows NT 5.0; H010818)" );
InputStreamReader isr = new InputStreamReader(i);
BufferedReader in = new BufferedReader(isr);
and the exception is...
Initializing AppEngine server
The server is running at http://localhost:8888/
java.io.IOException: Could not fetch URL: http://my-company-intranet.com
at
com.google.appengine.api.urlfetch.URLFetchServiceImpl.handleApplicationException(URLFetchServiceImpl.java:
75)
at
com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:
45)
at
com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler
$Connection.fetchResponse(URLFetchServiceStreamHandler.java:409)
at
com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler
$Connection.getInputStream(URLFetchServiceStreamHandler.java:290)
at
myproject.server.search.GreetingServiceImpl.getURLTextContent(GreetingServiceImpl.java:
118)
at
myproject.server.search.GreetingServiceImpl.greetServer(GreetingServiceImpl.java:
50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:
100)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:
562)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
188)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
224)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1093)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
121)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1084)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
360)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:352)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
at org.mortbay.jetty.HttpConnection
$RequestHandler.content(HttpConnection.java:844)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
396)
at org.mortbay.thread.BoundedThreadPool
$PoolThread.run(BoundedThreadPool.java:442)
Any ideas?
- Jason
On Mar 17, 10:29 am, jhulford <[email protected]> wrote:
> If you're not actually deploying to the App Engine environment you can
> remove the GAE class restrictions in the GWT plugin options and use
> whatever classes you want.
>
> On Mar 16, 10:09 pm, vegbenz <[email protected]> wrote:
>
> > So I discovered that I need to add any extra libraries into /war/WEB-
> > INF/lib -- added apache httpclient, apache logging, and apache codec
> > jars.
>
> > Now I get this error ---
>
> > java.net.Socket is a restricted class. Please see the Google App
> > Engine developer's guide
>
> > But the gwt docs seem to suggest i can use anything i want on the
> > server side:
>
> > "Tip: Although GWT translates Java into JavaScript for client-side
> > code, GWT does not meddle with your ability to run Java bytecode on
> > your server whatsoever. Server-side code doesn't need to be
> > translatable, so you're free to use any Java library you find useful."
>
> > Well this one would be useful... any ideas why it is a restricted
> > class? and what that means?
>
> > Anecdotally i saw that I should be able to use URLConnection? I guess
> > I'll try that.
>
> > Thanks!
>
> > On Mar 16, 11:43 am, vegbenz <[email protected]> wrote:
>
> > > Hi, when i run the code below as standalone pojo, it works fine, but
> > > in my "GreetingServiceImpl" on server it returns 500 error;
>
> > > ** please note i DO want to do this from the server. i saw the
> > > tutorial about adding script tags to accomplish this from the client.
> > > I need to do the fetch from the server side for other reasons.
> > > thanks!
>
> > > import java.io.IOException;
>
> > > import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
> > > import org.apache.commons.httpclient.HttpClient;
> > > import org.apache.commons.httpclient.HttpException;
> > > import org.apache.commons.httpclient.HttpStatus;
> > > import org.apache.commons.httpclient.methods.GetMethod;
> > > import org.apache.commons.httpclient.params.HttpMethodParams;
>
> > > public class TestRemoteCall {
>
> > > public static void main(String args[]) {
>
> > > HttpClient client = new HttpClient();
>
> > > GetMethod method = new
> > > GetMethod("http://waterdata.usgs.gov/tx/nwis/
> > > current/?
> > > type=flow&group_key=basin_cd&search_site_no_station_nm=barton");
>
> > > // Provide custom retry handler is necessary
> > >
> > > method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new
> > > DefaultHttpMethodRetryHandler(3, false));
>
> > > try {
> > > // Execute the method.
> > > int statusCode = client.executeMethod(method);
>
> > > if (statusCode != HttpStatus.SC_OK) {
> > > System.err.println("Method failed: " +
> > > method.getStatusLine());
> > > }
>
> > > // Read the response body.
> > > byte[] responseBody = method.getResponseBody();
>
> > > // Deal with the response.
> > > // Use caution: ensure correct character encoding
> > > and is not binary
> > > data
> > > // System.out.println(new
> > > String(responseBody));
> > > System.out.println(new String(responseBody));
>
> > > } catch (HttpException he) {
> > > System.err.println("Fatal protocol violation: " +
> > > he.getMessage());
> > > he.printStackTrace();
> > > } catch (IOException e) {
> > > System.err.println("Fatal transport error: " +
> > > e.getMessage());
> > > e.printStackTrace();
> > > } finally {
> > > // Release the connection.
> > > method.releaseConnection();
> > > }
> > > }
>
> > > }
>
> > > HERE is the error message
>
> > > import java.io.IOException;
>
> > > import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
> > > import org.apache.commons.httpclient.HttpClient;
> > > import org.apache.commons.httpclient.HttpException;
> > > import org.apache.commons.httpclient.HttpStatus;
> > > import org.apache.commons.httpclient.methods.GetMethod;
> > > import org.apache.commons.httpclient.params.HttpMethodParams;
>
> > > public class TestRemoteCall {
>
> > > public static void main(String args[]) {
>
> > > HttpClient client = new HttpClient();
>
> > > GetMethod method = new
> > > GetMethod("http://waterdata.usgs.gov/tx/nwis/
> > > current/?
> > > type=flow&group_key=basin_cd&search_site_no_station_nm=barton");
>
> > > // Provide custom retry handler is necessary
> > >
> > > method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new
> > > DefaultHttpMethodRetryHandler(3, false));
>
> > > try {
> > > // Execute the method.
> > > int statusCode = client.executeMethod(method);
>
> > > if (statusCode != HttpStatus.SC_OK) {
> > > System.err.println("Method failed: " +
> > > method.getStatusLine());
> > > }
>
> > > // Read the response body.
> > > byte[] responseBody = method.getResponseBody();
>
> > > // Deal with the response.
> > > // Use caution: ensure correct character encoding
> > > and is not binary
> > > data
> > > // System.out.println(new
> > > String(responseBody));
> > > System.out.println(new String(responseBody));
>
> > > } catch (HttpException he) {
> > > System.err.println("Fatal protocol violation: " +
> > > he.getMessage());
> > > he.printStackTrace();
> > > } catch (IOException e) {
> > > System.err.println("Fatal transport error: " +
> > > e.getMessage());
> > > e.printStackTrace();
> > > } finally {
> > > // Release the connection.
> > > method.releaseConnection();
> > > }
> > > }
>
> > > }
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