B4J Question Unable to access server on localhost

ozok · Aug 14, 2016

Hi,

I am trying to create a small test server using jserver. But I can't get it to work. I tried to derive my server from the sample provided here but using the original code also does not work.

I can launch the server using the IDE. In log it says server has started and I can see the java.exe under process explorer. Process explorer also reports that java.exe is listening to the configured port. However when I try to connect to localhost:8888 (this is the port for sample), under Opera, error message is "localhost sent no data" or something similar.

Turning off the antivirus did not work. I tried running B4J and command prompt as administrator.

Also, I can create a test server with Delphi using Indy, using the same port and it works fine. I can even access it from my mobile.

Regards.

Erel · Aug 15, 2016

I've just tested the example from the link and it works properly.

1. Downloaded, opened the project and ran it from the IDE.

2. Opened the following link with the browser: http://127.0.0.1:8888/

Can you post the logs?

ozok · Aug 15, 2016

Sure, here is the log in the IDE

B4X:

2016-08-15 09:16:49.248:INFO::main: Logging initialized @162ms
2016-08-15 09:16:49.373:INFO:oejs.Server:main: jetty-9.3.z-SNAPSHOT
2016-08-15 09:16:49.444:INFO:oejsh.ContextHandler:main: Started o.e.j.s.ServletContextHandler@675690{/,file:///E:/Download/ServerHelloWorld/ServerHelloWorld/Objects/www/,AVAILABLE}
2016-08-15 09:16:49.447:INFO:oejs.AbstractNCSARequestLog:main: Opened E:\Download\ServerHelloWorld\ServerHelloWorld\Objects\logs\b4j-2016_08_15.request.log
2016-08-15 09:16:49.545:INFO:oejs.ServerConnector:main: Started ServerConnector@ea639{HTTP/1.1,[http/1.1]}{0.0.0.0:8888}
2016-08-15 09:16:49.545:INFO:oejs.Server:main: Started @461ms
Server started

I'm on work computer now but the problem is still there.

Erel · Aug 15, 2016

Looks good. Are there any messages when you open 127.0.0.1:8888? Are you sure that you are using http and not https?

ozok · Aug 15, 2016

Yes, I use http. See attachment for I what I get when I open http://127.0.0.1:8888 on local pc. However, running the jar in one of our production servers seem to work, at least I can access is using http://127.0.0.1:8888/hello. I can't access it remotely but I guess this is because ports are not configured.

Production server is running Win server 2008r2 (java version8 update 91), while local computers I tried run Win10 (java version8 update 91). Local server I tested runs Win server 2012 r2 (java version version 8 update 101).

Edit1: log for the one that works:

B4X:

2016-08-15 09:38:32.472:INFO::main: Logging initialized @359ms
2016-08-15 09:38:32.738:INFO:oejs.Server:main: jetty-9.3.z-SNAPSHOT
2016-08-15 09:38:32.862:INFO:oejsh.ContextHandler:main: Started o.e.j.s.ServletContextHandler@9c9116{/,file:///C:/Users/Administrator/www,AVAILABLE}
2016-08-15 09:38:32.862:INFO:oejs.AbstractNCSARequestLog:main: Opened C:\Users\Administrator\logs\b4j-2016_08_15.request.log
2016-08-15 09:38:33.050:INFO:oejs.ServerConnector:main: Started ServerConnector@1d5622a{HTTP/1.1,[http/1.1]}{0.0.0.0:8888}
2016-08-15 09:38:33.050:INFO:oejs.Server:main: Started @970ms
Server started

The difference I notices is that all time values are double of the ones that do not work.

Edit2: Translation for attachment:
Cannot access this site.
12.0.0.1 refused to connect.

Erel · Aug 15, 2016

There is nothing special in those logs. Try it with a different port (51042).

ozok · Aug 15, 2016

Changing to the port you suggested didn't work either.

billzhan · Aug 15, 2016

You can ping you localhost in the command line.

B4X:

ping localhost
ping 127.0.0.1

And test with other browsers. Check if any proxy is used.

Erel · Aug 15, 2016

My guess is that the firewall blocks java.exe which means that it blocks the server.

ozok · Dec 9, 2016

No proxy is used also I have given permission to java.exe in the firewall. Same result with several PCs.

Edit: I can't ping it either.

Erel · Dec 11, 2016

Please try the attached project.
- Run it
- Open the browser
- Navigate to: 127.0.0.1:51042/test

B4J Question Unable to access server on localhost

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