Develop Reference

How to set intellij remote debug?

I am trying to debug my app in testing environment, my app is running in pod, I said 'pod' because I am not familiar with Kubernetes, its manage client looks like this:app running schematic diagram. I have learn I should set idea like this idea RUN/Debug Configurations schematic diagram. And should restart and redeploy my app, I changed Dockfile firstly. the origin instruction is FROM xxx/java:alpine VOLUME /tmp ADD recruitment.jar app.jar ENTRYPOINT ["java","-Xmx2048m","-jar","/app.jar"] and I changed this to FROM xxx/java:alpine VOLUME /tmp ADD recruitment.jar app.jar ENTRYPOINT ["java","-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005","-jar","/app.jar"] but it always show error like this Error running 'face_remote': Unable to open debugger port (888.88.888.888[not real]:5005): java.io.IOException "handshake timeout". I am not sure with this ip,sicne I use 'ping 888.88.888.888' instruction can not success. I use this ip because Swagger request url's domain name's ip is this.this main enter image description here. and I guess if the app is running in docker or k8s and it will have a different Interactive mode. not same like just running in linux

most of the attached image are not visible.
IP address should be accessible from your local system
[888.88.888.888] note sure this is correct.
debug port also need to be mapped from your local system
-use port forwarding
ex:kubectl port-forward 5005:5005
If you have configure port forwarding then you can use localhost:5005 for debugging

I see three things that you can check:
Check the IP address:
The jar file runs inside a Docker container, which runs inside a pod. To access the pod you usually go through a service and an ingress. The ip you are using is most likely hitting the ingress/service or any other higher layer.
To attach a remote debugger, you will need to connect directly to the PodIP. One way of doing this is to first connect to your kubernetes cluster using the tool kubectl (some configuration required) and make a port forward from your pod: kubectl port-forward my-pod-c93b8b6df-8c4aa 5005:5005 pod (as an example, the pod instance name is my-pod-c93b8b6df-8c4aa).
This will open a connection from your local computer into the pod. Then you will need to identify the PodIP by kubectl describe pods my-pod-c93b8b6df-8c4aa and use that in IntelliJ
Check if the port is exposed:
Make sure you expose the port 5005 from the pod in your test environment (similar to exposing a port when you run the container locally).
How to do this depends a bit on how you are running your Kubernetes cluster. If you use Helm chart, you can just add a configuration like this in the port section of your deployment yaml:
- containerPort: 5005
name: debug
protocol: TCP
Check debug-command address:
Last thing is to make sure you are adding the correct address in the command line option. As IntelliJ suggest in the debug editor: for JDK9+ use …suspend=n,address=*:5005 and for JDK8 and below use …suspend=n,address=5005

How to make Spring Boot application accessible by external IP address of the server?

I'm a newbie to Spring Boot. I have a REST API application written in Spring Boot. When I execute my Spring Boot JAR, everything is okay and I can access the REST API with the localhost address instead of the actual one:
http://localhost:8083/articles
But when I try to access the REST API by my external IP address, I can't do it:
http://100.90.80.70:8083/articles
netstat -antu command in the Linux terminal gives me the following output:
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp6 0 0 :::8083 :::* LISTEN
As I understand, my app is accessible only in localhost, because it hasn't a foreign address.
My application.properties file has only this line:
server.port=8083
Also, when I try to add a server.address line to application.properties like that:
server.address=100.90.80.70
server.port=8083
I have the following Exception: Caused by: java.net.BindException: Cannot assign requested address.
So my question is: how to make Spring Boot application accessible by external IP address of the server? Thank you.

As #Mark said, the problem is in the firewall. I have opened 8083 port in the firewall settings and now I can access my REST API app by the external IP address:
http://100.90.80.70:8083/articles
Linux command to check firewall status:
sudo ufw status verbose
Open 8083 port for remote access by TCP protocol:
sudo ufw allow 8083/tcp
More settings here: https://www.cyberciti.biz/faq/how-to-open-firewall-port-on-ubuntu-linux-12-04-14-04-lts/

I fixed the same by configuring port forwarding on my router, to allow traffic from public ip

In my OpenStack environment, after much debugging, the solution was to create a new Security Group Rule, which looks like this:
Security Group Rule.
Note that my Spring Boot application was deployed on port 8080.
I also noticed that on ubuntu18 the firewall is disabled by default. It did not cause any problems.

cannot use both TOMCAT server and my internet connection

I cannot have my tomcat server started and at the same time use internet.
either I can start Tomcat (in Eclipse) and internet is not available.
or I can access the internet but tomcat cannot be started.
Here the original probleme I had when I first wanted to use Tomcat and display my html page on localhost.
GRAVE: StandardServer.await: create[localhost:8005]: I find a way to start the Tomcat Server: in the terminal:
sudo lsof -i : 8005 # checks port 80
sudo route -n flush
sudo route add default 192.168.1.1
then I can use tomcat and localhost:8080 but my internet connexion is dead
if I want my internet connexion then I stop the tomcat server by clicking on the red square in eclipse and then in the terminal I do:
sudo route -n flush
sudo route add default 192.168.0.1
THen I can use internet but tomcat cannot be restarted. I have to undergo the first process.
this of course is a very boring process and I would like to know what 's wrong and how I could fix it.
I use tomcat 9 / Mac OS sierra / Eclipse Neon3

When you say "my internet connexion is dead", do you mean that your network connection drops or that your DNS lookups fail? (What do you think this command is doing and why are you performing it: sudo route add default 192.168.1.1?)
If your program is modifying your system's connectivity settings, I would strongly recommend against preventing it from doing that. There's no reason for it to do so at that level, a more appropriate place to set settings would be at some deploy stage.
Alternatively, you could run your app in a Docker container which I strongly suspect will solve your problem. Visit www.docker.com to learn more.

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.

Sun Directory Server can't connect ldap server

I'am installing ArcGisServer for the Java plataform on Centos 5.5 x86_64, this is not a supported platform but I have overcome almost every problem preventing the success of the installation. It uses exhaustively Sun Directory Server. The last error i receive was:
ldap_simple_bind: Can't connect to the ldap server - No route to host
It happens in other applications which makes uses of it, so it seems to be an specific problem of Sun Directory Server on linux and solaris. There is no reported solution. Usually I search the problem as much as I can but this time I have reached my patience and I need it working as soon as posible. I recognize this as an excellent forum because of it's community and quality of answers, ¿can anybody help me with this?

The "No route to host" error suggests that the issue is one of network connectivity between your ArcGIS server (the Sun Directory Server component, as you mention) and the LDAP server. So, a few things to examine, in order:
Do you have an LDAP server set up and running?
Is your LDAP server reachable from your Centos machine outside of the ArcGis server?
Is your ArcGis configured with the correct address to the LDAP server - should be in the web.config file? Example below:
<connectionStrings>
<add name="ADConnectionString"
connectionString="LDAP://SERVER_LDAP:389/ou=Sigestredi,o=Sicondef,dc=aplicaciones,o=mdef,c= es" />
</connectionStrings>
Disclaimer: I don't know anything about the ArcGIS server per se - I'm just diagnosing the "no route to host error" with a few snippets I picked up from some quick searches of the ArcGis forums.

ArcGIS includes a Sun Directory Server on it, so arcgis server and ldap are on the same machine. The port is set to 62000. When I run the diagnostic tool the DG028 fails:
DG028 - check LDAP server: is listening
I made a prove using nmap as:
nmap localhost -p62000
And it says it is opened. I don't know how to verify if LDAP is up and running, the startup log doesn't show anything wrong. I have found a config file named ldap.conf:
url ldap://name.subdomain.domain:62000/dc=name,dc=arcgis
admnm agsadmin
And my /etc/hosts is:
127.0.0.1 localhost localhost
ip_direction name.subdomain.domain name.subdomain.domain
I don't have an alias for "name", so:
ping name.subdomain.domain
Works
But:
ping name
Doesn't work
I have never used ldap so I don't know what should be on "dc". Could my hosts file be malformed or is my ldap.conf?
Another information is that the computer I am using is part of a domain. When I installed Centos, /etc/hosts file had an alias for the loopback interface as localhost.localdomain but i removed it.
I would appreciate any help.

I have solved my problem, the problem was on my /etc/hosts file. I added an alias for my ip direction:
127.0.0.1 localhost localhost
ip_direction name.subdomain.domain name
Then I run the ServerConfig script. This is a successful installation of ArcGIS Server for the Java platform on Linux. Thanks Greg for your guide.