Develop Reference

How to remote debug WebLogic server when it started as Windows Service

I tried almost all internet and stackoverflow tips and no one didn't help me to open ports in Weblogic Server. My Weblogic server starts as windows service in windows server 2008 r2. In config.xml on the path
..user_projects\domains\%Any_app%\config\config.xml i added this string for each server in arguments -
<server-start>
<arguments>... -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=1777,server=y,suspend=n ...
</arguments>
</server-start>
and i always check in cmd with netstate -a or telnet this port but it doesn't appear and doesn't work.

For the first, check your firewall - ensure that port is open.
Second, check config.xml again, then in administration console go to
Servers - Configuration - Listen Port - made modifications if needed.
Restart weblogic. Check if service is started, if not then modify windows service.
Read this article how to manage ports.
Change the port number with WLST, if it possible for you.

For me the solution was to edit regedit with my weblogic as win service. Path:HKEY_LOCAL_MACHINE/SYSTEM/services/%Name_of_service% and here u can edit settings
(add some strings in setting fields) and then restart machine with u server.

Connect JVisualVM to a Remote Wildfly Instance?

I'm trying to connect JVisualVM, running on my local machine, to a remote machine which is running a WildFly server (version 8.1.0, to be specific.)
I didn't configure the WildFly server myself, and I don't know who did, but I do know that I can log in as an administrative user from my local machine by pointing my browser at:
https://[ip address of the remote machine]:9443/console
Note that it's https, not ordinary http, and that the port for that has been set to 9443 (I think the default is 8080 or 9990 or something... IDK, I saw a lot of port numbers online. I have been explicitly told that http was disabled for this WildFly server).
I can SSH into the remote machine. I can navigate to the bin directory for WildFly and run jboss-client.sh. I have to connect on port 9999 (I think the default is 9990 for that?)
I copied the jboss-client.jar (under bin/client) to my local machine and ran JVisualVM from the command line like this:
.\jvisualvm.exe -cp:a C:\[path to]\jboss-client.jar
It launches fine. File > Add Remote Host: Then I entered the IP. OK. I right clicked on it under Remote in the tree and picked Add JMX Connection. I entered
service:jmx:http-remoting-jmx://[ip]:9999
I checked off that I wanted to use the security credentials and entered the username and password. Checked off to save the security credentials. Left "Do not require SSL Connection" unchecked. Hit OK. It immediately spat out the message
Cannot connect to admin#service:jmx:http-remoting-jmx://[ip]:9999 using service:jmx:http-remoting-jmx://[ip]:9999
I also tried the port 9443, 9990, and 8080 instead. None of those worked. I tried https instead of http in the protocol name. That also didn't work.
What am I missing? How is it that I can access the console, and connect with jboss-client.sh, but I can't use JVisualVM? Is there some log I can use somewhere to see what's wrong? Maybe someone can point out a configuration I've missed somewhere?
Not sure if it's important or not, but my local machine is running Windows 10 with JDK8 installed. The WildFly server is using Java 6 on CentOS 6.3.

You need to add the jboss-client.jar (or jboss-cli-client.jar) to the class path for JVisualVM. The library can be found in the bin/client directory of the WildFly install.
I used the following command to add the library to the class path.
jvisualvm --cp:a ~/servers/wildfly-10.0.0.Final/bin/client/jboss-client.jar
Then I used service:jmx:remote+http://[ip]:[port] and was able to connect.

I don't know if someone else is also (still) having the same issue (Wildfly10 on a remote machine where management console is available at 9443 with HTTPS). The following worked for me.
For ssh connections:
Starting jvisualvm with jboss-client.jar
jvisualvm --cp:a #JBOSS_HOME/bin/client/jboss-client.jar
Using the following connection string:
service:jmx:remote+https://remote-server:9443
NOTE: I used here remote+https
Provide username and password
Hope this helps.

you missed run jstatd command in remote host ,
this little program is RMI server that possible connection from client to remote host though you using jmx connection it used jmxrmi protocol for that connection .
so first in remote host create file name as security.policy with this contain :
grant codebase "file:${java.home}/../lib/tools.jar" {
permission java.security.AllPermission;
};
off course you must in file section for linux put explicit path and then of creation this file put it in bin directory of jdk.home
then you should run this command on remote host
$JAVA_HOME/bin/jstatd -J-Djava.security.policy=path of /security.policy -J-Djava.rmi.server.hostname=remote ip address -J-Djava.net.preferIPv4Stack=true
then you could connect to server off course with correct settings.

Include jboss-cli-client.jar and jboss-client.jar under \lib\visualvm\platform\lib and restart jvisualvm to pickup new jars.

Error while running webapplication with google appengine

I created a small web application.if i deployed its work but if try to run application it show
the port 8888 appears to be in use(perhaps by another lanch),do you still to contine with this lanch? i clicked yes
but show the error
Could not open the requested socket: Address already in use: bind
Try overriding --address and/or --port.

The problem is what it is stating.
You are facing this issue because of the following:
Either the port 8888 is in use by some other application and not previous launch. This is less likely.
This condition is more likely and it is because you have already launched the application once i.e. via the Run as Web Application. And it is still running. In your Eclipse, visit the Window-> Show View -> Console. And in the Console window, you will find one or more previous instances running. Please stop that.

There are some instances where the solution suggested by Romin will not work because the option to stop the process does not present itself in the console.
In these cases, you can probably find out which process ID is using the port and then kill that process.
For example, on a mac, this worked for me:
😈 >lsof -i tcp:8888
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 25866 alexryan 60u IPv6 0x96e9c26778f105e1 0t0 TCP localhost:ddi-tcp-1 (LISTEN)
😈 >kill 25866
😈 >lsof -i tcp:8888
😈 >

The port number 8888 is in use means that port already been activated. do one thing go to servicees option of control panel set the server start option from automatic to manual. Then your apps will get run. else you can stop the server from your eclipse env stop option.

Tomcat 7 is not running on browser(http://localhost:8080/ )

Actually the apache-tomcat 7 server running at The Eclipse.but in browser getting error "The requested resource is not available." .Any reasons Please..?

When you start tomcat independently and type http://localhost:8080/, tomcat show its default page (tomcat has its default page at TOMCAT_ROOT_DIRECTORY\webapps\ROOT\index.jsp).
When you start tomcat from eclipse, eclipse doesn't have any default page for url http://localhost:8080/ so it show error message. This doesn't mean that tomcat7 is not running.when you put your project specific url like http://localhost:8080/PROJECT_NAME_YOU_HAVE_CREATE_USING_ECLIPSE will display the default page of your web project.

I had the same issue and for me, I tried changing the options in
Server Locations
and it worked.
Double click on the Tomcat Server under the Servers tab in Eclipse
Doing that opens a window in the editor with the top heading being Overview opens (there are 2 tabs-Overview and Modules).
In that change the options under Server Locations, and give Ctrl+S (Save configurations)
For me, Use Tomcat installation (takes control of Tomcat installation) worked
Try starting the server and checking if localhost opens in the browser. Else select a different option.
I do not understand why that issue came up. I did search but did not find a relevant answer(Maybe I didn't use the right keywords). If someone knows why that worked, kindly share.
Thanks.

There could be a number of reasons, have it as a checklist and go through it
Is your server running on 8080?I mean that is the default port but it could be configured to run on other.
Also there is a possibility that the default application is removed/uninstalled that is why it is giving "the requested resource is not available"
Also it could be a proxy issue. make sure you are not using any proxy in your browser.

1)Goto Server tab
2)Right on server -> general -> click on switch location.
3)Double click on the server -> under server location -> select tomcat installation.
4) restart the server.

It will be proxy configuration of your browser.
In NetWork Setting, use no proxy
For Manual proxy configuration add exception(No Proxy for in Firefox) like localhost:8080, localhost.

You may face two errors while testing tomcat server startup.
Error in the Eclipse inbuilt browser - This page can’t be displayed
Turn on TLS 1.0, TLS 1.1, and TLS 1.2 in Advanced settings and try connecting to https://localhost:8080 again. If this error persists, it is possible that this site uses an unsupported protocol. Please contact the site administrator.
404 error in the normal browsers.
Fixes -
For the eclipse browser error, check whether you are using secured URL - https://localhost:8080. This should be http://localhost:8080
For the 404 error:
Go to Tomcat server in the console. Do a right click, select properties. In the properties window, Click "Switch location" and then click OK.
Followed by that, Go to Tomcat server in the console, double click it, Under "server locations" select "Use Tomcat installation" radio button. Save it.
The reason for choosing this option is, When the default option is given as eclipse location, we will see 404 error as it changes Catalina parameters (sometimes). But if we change it to Tomcat location, it works fine.

Sometimes another software can be holding this door and it can be the cause of this conflict, try change the door on the server.xml.

Double click on the Tomcat Server under the Servers tab in Eclipse
Doing that opens a window in the editor with the top heading being Overview opens (there are 2 tabs-Overview and Modules).
In that change the options under Server Locations, and g

You can run below commands.
./catalina.sh run
Note: Make sure the port 8080 is open. If not, kill the process that is using 8080 port using sudo kill -9 $(sudo lsof -t -i:8080)

Many of us get this error after setting up the eclipse and server for first time. This solution is -
go to server tab
select the properties option of your respective server and expand it
in the properties window ,
select general tab -> click Switch Location -> click apply
->click ok.
This may work .

Binding a port < 1024 for non root user in Java

I have a Java application which is running as non root mode.
My App will create a TFTP server (using apache commons tftp). TFTP server is bind to port 69(Default TFTP port). When running the app from IDE everything works fine since the IDE running as root. But if the app is run from other user i get the error
java.net.BindException: Permission denied
It is clear that for non root user i can not open the port. Is there a workaround for this issue?

For binding on Linux of ports less that 1024 you need to application to run a root. There is no way around this. If you need to do this you have you run as root. sudo might be the command to look into.
BTW - Running your IDE as root is not a very good idea.

To resolve this issue. You can use setuid() and setfid() system calls. So that you can temporarily elevate the permissions and then drop the permission back to user permissions.

In my Case, this problem happened in Solaris 11 OS. I added privileges to user to use the ports under 1024.
https://technicalsanctuary.wordpress.com/2014/06/03/allowing-a-user-to-use-ports-under-1024-on-solaris-11/