How do I set the Java proxy settings in Ubuntu (10.04 or 12.04), from the command line?
What I am aiming at is to get direct connection, but by default it takes it from browser settings which are meant to go via a proxy - just I don't want Java to go via the proxy.
I am running an application server in Ubuntu which serves remote desktop sessions. I can put the Java control panel into the user's desktop, and then they (each individual user) can set the proxy settings under Network Settings. However - this means I have to tell each user to make this setting, which is not workable.
I want it set via some command line or environment variable on the server itself, so it defaults to "direct connection". I am not familiar with Java programming and it won't help much to give me Java code for this, I think it must be possible to set the defaults upon Java startup? Any pointers are welcome.
How can I do this?
Instead of command line you can edit $javaDirectory/jre/lib/net.properties.
Remove # in-front of:
http.proxyHost="proxy host"
http.proxyPort="proxy port"
https.proxyHost="proxy host"
https.proxyPort="proxy port"
and set your proxy there.
You can export the http_proxy environment variable via command line.
Ex:
$ export http_proxy=http://proxy-server:port
There is a environment variable ftp_proxy also, just in case you need it.
Related
I've made a script called debug.sh and placed it under the bin directory (start it with ./debug.sh) to start Tomcat 8 in debugging mode:
set JPDA_ADDRESS=8000
set JPDA_TRANSPORT=dt_socket
set JAVA_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n
bash catalina.sh jpda start
But if it started, there is now message which says, that Tomcat is listening on port 8000. Also if I type
netstat -nat
there is no application listening on port 8000.
What exact configuration do I have to set, to remote debug my Tomcat 8 server which is running on a specific IP or do I have just a little problem in my script?
This answer has been updated following the comments, I did not understand the problem in the first place.
I guess you have followed that doc: this is about developing Tomcat itself.
I am not sure you are using the proper way to configure the port (I don't know your specific configuration details). In a standard environment, the ports are configured in the server.xml (note that several different ports are used by Tomcat for the different services).
To remotely monitor your server, you should use a JMX client. As far as I know, Eclipse doesn't include one (or at least not one documented) - you could code one as this is a Java specification (JSR262). You have one in a standard Java environement (JConsole). By default, JMX is not enabled on Tomcat. If you need to enable it, the fine way is to follow the doc.
Tomcat JMX monitoring and JConsole are both available in most versions of Tomcat and the Java runtime.
The following exchange seems to be about your problem.
Respected Experts,
I have a stand alone java application and want to monitor the threads created by it. I am planning to use a tool like JConsole or JVisualVM. However, I am not able to connect these tools locally to my Java Application.
I am using Windows machine. JConsole and Java program are running locally. I have tried to run Java application with following JMV arguments with no success:
java -Dcom.sun.management.jmxremote.port=9999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false LinkedListTest
When I try to connect using JConsole, my process id is greyed and following message appears:
Note: The management agent is not enabled on this process
I think I should be able to connect JConsole to a stand alone java application. Any thoughts what I am missing here
Thanks and Regards
Thanks for the inputs. I was able to solve the problem and the details are as follows:
As #Holger mentioned, both JConsole and JVisualVM can connect to the local Java Application running without any JMX arguments. The problem that I was facing was machine specific. I restarted the machine and deleted the following directory:
%TMP%\hsperfdata_User.Name
(I was not able to delete this directory without doing a restart)
Restarted JConsole/JVisualVM and was able to connect to local java processes using the process id.
In fact, the use of JVisualVM pointed me towards this fix. On start of JVisualVM, I got an error message stating something like local processes/applications can't be monitored. The message had a link to Troubleshooting guide. I am reproducing the relevant snippet:
Local Applications Cannot Be Monitored (Error Dialog On Startup)
Description: An error dialog saying that local applications cannot be monitored is shown >immediately after VisualVM startup. Locally running Java applications are displayed as Application> (pid ###).
Resolution: This can happen on Windows systems if the username contains capitalized letters. In >this case, username is UserName but the jvmstat directory created by JDK is >%TMP%\hsperfdata_username. To workaround the problem, exit all Java applications, delete the >%TMP%\hsperfdata_username directory and create new %TMP%\hsperfdata_UserName directory.
However, on my machine directory had the following format:
%TMP%\hsperfdata_User.Name
So, my recommendations are:
-check the name of the above mentioned directory for presence of camel case user name
-If not, follow the steps from the Trouble Shooting guide
-If the problem persists, delete the directory (may require machine reboot, as in my case)
-Restart JConsole/JVisualVM
Hopefully, the problem would be resolved.
Thanks and Regards
I am using windows 8 (64bit) but not able to get access to internet using netbeans. When I am trying to update via Help > Check for Update I am getting
Check your network connection, verify that your proxy settings are configured correctly in the NetBeans IDE, or try again later.
When I am trying to access some url with a program in java I am getting error
connection refused: Address is invalid on local machine
whats going on here????
I need to force Java to use IPv4, to do so set it by command
setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true
Are you behind a proxy server? Go to Tools > Options > General and try to change the network settings according to your network config.
EDIT: It may also be a firewall issue.
Are you using a proxy server, because if you are then you will need to use a ProxyAuthenticator java class which will can be called within your Java class. This should allow your class to access the Internet.
However, it may be worth checking your NetBeans Internet settings (Tools -> Options -> General) and checking whether a HTTP Proxy authentication is being used. Even so, a ProxyAuthenticator Java class may still be required (assuming a Proxy server is being used). Please see Authenticated HTTP proxy with Java
I wrote a Java servlet filter on my local machine and deployed it a remote (machine) web server. Unfortunately, it's been very difficult and time-consuming trying to trace errors reported by Apache Tomcat 5.5, my JSP/servlet engine. I can't keep writing System.out.println(...), saving, deploying, testing JSP pages, and so on. It's taking too long. There has to be a better, faster way.
Is it possible to remotely debug servlet filters? I don't have a web server on my local machine, which is why I'm asking about remote debugging. Specifically, I'm looking for a way to debug, line-by-line, the servlet filter, on-the-fly, as it's happening on the remote web server. Does such a method exist?
Or, is there a better method than writing to standard output. It's taking too long and I feel that must be a more efficient means of debugging Java servlet filters.
Note: I'm using Eclipse for development.
Thank you very much for any help.
Update
Thank you all for your help. I really appreciate it.
I added the JVM argument to Tomcat, restarted Tomcat. Then, on the machine with Eclipse, I entered in the appropriate info in the Debug config, put the breakpoint in, and tested. Unfortunately, it did not work. In the config, I left it as Socket Attach, clicked apply, and that was it. I pressed the debug button and it said the connection was refused. I tried ports 8000 and 8001 and both did not work.
Let me explain what I'm trying to do, that might be better.
I have a login page called login.jsp. On that page, is a form whose action attribute is servlet/LoginServlet. When the user submits the form, it calls servlet/LoginServlet, which is mapped to a class in the web.xml file. Let's call this class com.mysite.mypkg.classA. In class A, it calls a method from another class called com.custom.mypkg.classB. I want to put a breakpoint in classB.
So, using the url with login.jsp page in the Eclipse debugger won't call it. I tried using servlet/LoginServlet and that also did not work.
What should I put in for the URL? Or, do I debug this type of setup?
Thank you.
Update 2
I found this site here, which is pretty comprehensive. I ran netstat -a and noticed that the debug port is not listed. Windows Firewall is turned off, but there could be another thing blocking the port, who knows. Anyway, I placed the VM argument here and it's not working.
Thank you.
For remote debugging you need to start the server in debug mode. There are couple of ways doing that.
1 > start the server using
catinlina.bat jpda start
2 > Add an jvm argument to the tomcat java process
-Xdebug -Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n
Once the server is started in debug mode , you need to change the perspective of the project in eclipse to debug.
Then go to Run - > Debug configuration.
Double click remote java application and enter the details such as
Remote IP address
Debug port . Default tomcat debug port is 8000. If you use jvm argument, use the port mentioned in the jvm argument.
Click Apply
Go to the java file you want to debug.
Put a break point in the source code and run the scenario you want to test (Eg Web application using browser)
Also , ensure that the code in the java file is in sync with code deployed on remote server.
Happy Debugging!!!
Peace.
Sanket Raut
You can attach a debugger to a running Tomcat instance, provided that you gave it the right command line options when you launched it.
The Tomcat Development Wiki explains how to do this, and as a bonus gives you instructions on how to set up to debug from the Eclipse or NetBeans IDEs.
Of course, attaching a debugger to a running Tomcat has both security and performance implications*.
* And OH&S issues - you might get badly scratched if you tried this on the wrong kind of tomcat ...
You should run your remote tomcat with the following starup parameter:
bin/catalina.bat jpda start
Then in Eclipse on your local machine go to Run -> Debug Configurations -> Remote Java Application, create new configuration here, use IP of the remote machine as a host and 8000 as a port there
Run this configuration and use the breakpoints in Eclipse for debugging
When I fire up Jetty, it gives me the standard URL: http://127.0.0.1:8888/index.jsp?gwt.codesvr=127.0.0.1:9997
Great. I can see this URL from my machine. However, I cannot access this URL from other machine, and replacing the 127.0.0.1 with my actual IP address does not work either.
Does anyone know how I can make my server "sharable" so that other people in my network can hit off my machine as well?
Try to start the server with -bindAddress option using your external IP. See this.
Just follow the following Steps,
Right Click on Project
Go to run as ---- > Run Configurations
Select Arguments and add -bindAddress 0.0.0.0 to Program Arguments
Click On Apply & Run