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What is the Kerberos method?

I'm trying to connect to hive with jdbc. I keep getting this error. I tried looking it up but could not hind anything useful .
This is my connection string:
jdbc:hive2://hostname.xxx.com:10000/default;principal=hive/hostname.xxx.com#HADOOP_ENV.COM
What is this error: java.lang.NoSuchMethodError: org.apache.hadoop.security.authentication.util.KerberosUtil.hasKerberosTicket(Ljavax/security/auth/Subject;)Z

That method exists in Hadoop 2.8 but not in Hadoop 2.7 -- so my guess is that your project dependencies are not aligned with whatever version of Hadoop you have in Production.
Code in trunk
https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/KerberosUtil.java
code in branch-2.8.0
https://github.com/apache/hadoop/blob/branch-2.8.0/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/KerberosUtil.java
code in branch-2.7.4
https://github.com/apache/hadoop/blob/branch-2.7.4/hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/util/KerberosUtil.java

Kerberos is an authentication protocol that is used by Hive server (https://en.wikipedia.org/wiki/Kerberos_(protocol))
The problem you are setting is more about a missing library in our pom.xml. Have you include <artifactId>hive-jdbc</artifactId> ?

I think your keberos ticket is not generated properly
Can you try running these two commands in order from the user you are trying to connect:
kdestroy (deleted any kerberos ticket generated before)
kinit (generates a new ticket)
Then try to connect again.

Android ssh connection JSch

I try to open ssh connection via JSch. I added com.jcraft.jsch and com.jcraft.jzlib package in my src folder. But when I try to run my application I had an error org.ietf.jgss package. That package I successfully found and added but at this moment I have a problem with package sun.security.jgss.spi and package sun.security.util
As I found packet sun.security is no available more. Thats correct?
I must use another library for ssh connection?

Java DB doesn't run without NetBean [duplicate]

I have a Java application, which uses Apache Derby. Using Eclipse Export option, I exported it as JAR file. When I am running Eclipse, and the server is connected to port 1527, the JAR executes correctly.
However when eclipse is closed, (and the server is not connected to 1527) on executing jar, i get this error
java.sql.SQLNonTransientConnectionException: java.net.ConnectException
: Error connecting to server localhost on port 1527 with message
Connection refused.
This is understandable. But i want to distribute the JAR. So is there a way to start the server programmatically, whenever JAR is executed?

You can start the NetworkServer programmatically:
NetworkServerControl serverControl = new NetworkServerControl(InetAddress.getByName("myhost"),1621)
serverControl.shutdown();

Simplest is to use embedded Derby
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
conn = DriverManager.getConnection("jdbc:derby:" + DATA_STORE + ";create=true");

You need to start the server programmatically.
How this is done is documented in the manual:
http://db.apache.org/derby/docs/10.8/adminguide/tadminconfig814963.html

Eclipse : Failed to connect to remote VM. Connection refused. [duplicate]

This question already has answers here:
Eclipse Error: "Failed to connect to remote VM"
(26 answers)
Closed 9 years ago.
When ever i tried to launch my eclipse debug(for server side code) i'm getting the following error Failed to connect to remote VM. Connection refused.
What's the problem may be? I already tried with most of the solutions out in the web but none of that solved my issue. Could any one can assist me to fix this? Advance thanks..

when you have Failed to connect to remote VM Connection refused error, restart your eclipse

Which server are you using?
Like already said:
In your debug configuration you'll have to define the right port of your server (GF:9009 / Tomcat:8000)
You'll have to set the JVM property of the server to debug
For Glassfish:
Log in to admin-console > Configurations > server-config > JVM-Settings > check DEBUG checkbox > restart server
For Tomcat:
create file debug.bat/.sh (depending on your OS) in %TOMCAT_HOME%/bin directory and write
set JPDA_ADDRESS=8000
set JPDA_TRANSPORT=dt_socket
catalina.bat jpda start
in it.
After you've created this file start server by executing debug.bat/.sh.
Now you should be able to debug remotely in Eclipse after you set the necessary properties in your debug configuration.
Hope this helped! Have Fun!
EDIT
If you're running tomcat in a Win environment as a service you don't have a catalina.bat file in the bin-directory of your tomcat installation.
To set your server into debug-mode please try the following:
Run the Configuration option in Windows Menu or run %catalina_home%/bin/tomcat6w.exe
In Java tab, add this line to Java:
options:-Xrunjdwp:transport=dt_socket,address=8000,server=y,suspend=n

Sometimes the port which you are trying to access, gets occupied and won't be released.
Try some tools to find whether the port is in use or not.
I also faced the same issue. I tried giving different port numbers but unfortunately it didn't work. I tried restarting the system (not the application server), and it worked :)

I faced the same issue. But i resolved it by changing my port numbers to different one.

The port number in the Eclipse configuration and the port number of
your application might not be the same.
You might not have been started your application with the right
parameters.
Those are the simple problems when I have faced "Connection refused" error.

As suat said, most of the time the connection refused is due to the fact that the port you set up is in use or there is a difference between the port number in your remote application debugging configuration in Eclipse and the port number used in the address attribute in
-Xrunjdwp:transport=dt_socket,address=1044,server=y,suspend=n.
Check those things. Thanks!

If you need to debug an application working on Tomcat, make sure that your Tomcat-folder/bin/startup.bat (if using windows) contains the following lines:
set JPDA_TRANSPORT="dt_socket"
set JPDA_ADDRESS=8000
call "%EXECUTABLE%" jpda start %CMD_LINE_ARGS%

I ran into this problem debugging play framework version 2.x, turned out the server hadn't been started even though the play debug run command was issued. After a first request to the webserver which caused the play framework to really start the application at port 9000, I was able to connect properly to the debug port 9999 from eclipse.
[info] play - Application started (Dev)
The text above was shown in the console when the message above appeared, indicating why eclipse couldn't connect before first http request.

NBGit to remote host with ssh

I´m trying to get that working:
clone a git project from an ssh server with NBGit. I get NBGit installed, works well local, but when given the connection parameters I´m not sure what is the right URL.
Or maybe it is not supported at the moment?
NBGit 0.4 for NB 6.9.1 on Win7

The URL should be:
git#myserver:/myreppo
But as reported in issue 91, that might not work very well.
I would explore the workaround presented in issue 56:
In your ~/.ssh directory, create a "config" file
open ~/.ssh/config in a text editor and put in the following:
Host AHostName -- this will be the name you will be calling in nbgit
User gituser
Hostname SSH IP address --eg 192.68.24.1 --my git server
Port 1234 -- use this if you need custom ports
IdentityFile "path to your private ssh key"
From there, the url can be:
AHostName:myrepo