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Debugging with jdb: transport err 202 get addrinfo

I'm to use the Java debugger in the terminal for Mac, and it seems to let me use it randomly. Sometimes it works, but other times it gives me this message:
run
run Lab5 commands1.txt
VM start exception: VM initialization failed for: /Library/Java/JavaVirtualMachines/jdk-11.0.2.jdk/Contents/Home/bin/java -Xdebug -Xrunjdwp:transport=dt_socket,address=Uzomas-MacBook-Air.local:49188,suspend=y Lab5 commands1.txt
ERROR: transport error 202: getaddrinfo: unknown host
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [:732]
I've researched solutions for this but never understood how to implement them, and I don't have enough reputation to comment so this is my only way

why i get Error running 'JBoss 11.0.0.Final': Unable to open debugger port (127.0.0.1:56884): java.net.SocketException "socket closed"?

I use latest intellij idea ultimate with wildfly 11 and i develop web application with maven and java 8.
when i run debug i get following error.
Error running 'JBoss 11.0.0.Final': Unable to open debugger port (127.0.0.1:56884): java.net.SocketException "socket closed"
when i run application i get
Error running 'JBoss 11.0.0.Final': Address 127.0.0.1:9990 is already in use
iI did changed the port to 9991 in standalone.xml and got the following error:
Application Server was not connected before run configuration stop, reason: Unable to ping server at localhost:8080
Does any one know what am i missing?

Shutting down remotely debugged tomcat started from eclipse

When I start my Tomcat 7 from Eclipse, I usually add something like
-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8101
to its launch configuration, since I sometimes want to attach the Eclipse debugger remotely later. But when I do this and try to shut down the Tomcat from Cclipses "servers" view, I receive the error
FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)
ERROR: transport error 202: bind failed: Address already in use
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized
I assume this is because Eclipse starts a new process that normally tells the running Tomcat to shut down, and also uses the debugging arguments I introduced in to the launch configuration. This process fails, since the named port 8101 is already used. Does anybody have an idea to allow a clean Tomcat shutdown in that setting?
(I do not want to start the Tomcat in Debug mode in the first place since that slows down both eclipse and the Tomcat. Neither do I want to restart it in debug mode when I want to debug, since that takes quite some time.)

In Tomcat's server.xml
<Server port="8005" shutdown="SHUTDOWN">
The setting can be used to shutdown Tomcat. You can write a simple program and run it.
import java.net.*;
public class t {
public static void main(String[] args) throws Exception {
Socket s = new Socket("127.0.0.1",8005);
s.getOutputStream().write("SHUTDOWN".getBytes());
s.close();
}
}

Algorithm negotiation fail in Jenkins

I saw an answer to the same issue in Algorithm negotiation fail SSH in Jenkins
I am facing the same problem, but updating ss_config did not help and I still get the same error. I also have another problem, which maybe related to this. In Jenkins general configuration I added my build slave as a remote host and gave it hostname, port, username, and keyfile path, but it still says "Can't connect to server". I wonder why, because if I login to Jenkins machine I can easily connect to my remote host in the command line using the same keyfile.
Update:
This is the line I added to ssh_config:
KexAlgorithms diffie-hellman-group1-sha1,curve25519-sha256#libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1
This is the console output in Jenkins:
[SSH] Exception:Algorithm negotiation fail
com.jcraft.jsch.JSchException: Algorithm negotiation fail
at com.jcraft.jsch.Session.receive_kexinit(Session.java:520)
at com.jcraft.jsch.Session.connect(Session.java:286)
at com.jcraft.jsch.Session.connect(Session.java:150)
at org.jvnet.hudson.plugins.SSHSite.createSession(SSHSite.java:141)
at org.jvnet.hudson.plugins.SSHSite.executeCommand(SSHSite.java:151)
at org.jvnet.hudson.plugins.SSHBuilder.perform(SSHBuilder.java:60)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)
at hudson.model.Build$BuildExecution.build(Build.java:205)
at hudson.model.Build$BuildExecution.doRun(Build.java:162)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:537)
at hudson.model.Run.execute(Run.java:1741)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:381)
Build step 'Execute shell script on remote host using ssh' marked build as failure
[SSH] executing post build script:

I figured it out, I am using Ubuntu 15.04 as remote host which uses ssh version 6.7 and this version disabled most of the encryption algorithm by default. And I needed to add this line:
KexAlgorithms diffie-hellman-group1-sha1,curve25519-sha256#libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1
NOT to the ssh_config, BUT to sshd_config.

Jboss Error While debugging -FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)

I am using Ubuntu 15.04, java 1.7and mysql 5.6. I am not using any server
I have a demo application where I am trying to fetch the data from db.
When i run the program from main method in the log I am getting null pointer exception.
To check when I am trying to debug as java application, I am getting an error message saying
ERROR: transport error 202: connect failed: No route to host
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [../../../src/share/back/debugInit.c:750]
FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)
What is the cause of this error?
how to resolve this?

I got this message using folowing command:
-agentlib:jdwp=transport=dt_socket,address=8000,server=n,suspend=n
Changing to
-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n
solved the problem.