Problem with Kafka zookeeper server start - windows

I tried to startKkafka zookooper server on command prompt, but I get and error message.
What I am doing wrong?
I inserted a command:
D:\kafka\bin\windows>zookeeper-server-start.bat ....\config\zookeeper.properties.
I got message:
"\MySQL\Connector was unexpected at this time."

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Oracle Sql developer throwing error message : Internal Error: Fetch error message failed! Vendor code 17001

I have recently moved from TCP to TCPS Connection. I can confirm that all my connection parameters are right and properly set. tnsnames.ora and sqlnet.ora is under oracle_home/network/admin folder.
I am trying to connect and getting below error message:
An error was encountered performing the requested operation:
Internal Error: Fetch error message failed!
Vendor code 17001
Looking for suggestions to fix issue.
Make sure that the Oracle Client "bin" directory (e.g. $ORACLE_HOME/bin) is in your PATH environment variable.

Trouble with installation of Oracle 11g server version

This error with the words:
"[INS-20810] Target or command to 'Oracle Net Configuration Assistant' not valid" is shown at the end of installation when the net configuration has to be installed properly.
And then suddenly some error messages with the words "An error occurred during runtime", pop up.
Then if I ignore the error messages and click skip, the installation gets completed leaving the essential net configuration and other database set ups uninstalled. Then when I get into sqlplus and enter the correct username and password too, it shows me an error with the message "ORA-12560: TNS:protocol adapter error".

greenplum initialization failed

When I tried to initialize Greenplum I got the following error
20180408:23:21:02:017614 gpstop:datanode3:root-[INFO]:-Starting gpstop with args:
20180408:23:21:02:017614 gpstop:datanode3:root-[INFO]:-Gathering information and validating the environment...
20180408:23:21:02:017614 gpstop:datanode3:root-[ERROR]:-gpstop error: postmaster.pid file does not exist. is Greenplum instance already stopped?
also when i tried to check gpstate command i got the following error
20180408:23:21:48:017711 gpstate:datanode3:root-[INFO]:-Starting gpstate with args:
20180408:23:21:48:017711 gpstate:datanode3:root-[INFO]:-local Greenplum Version: 'postgres (Greenplum Database) 5.7.0 build f7c6eb5-oss'
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I also did the configuration an add a permission on PostgreSQL.conf, but the same issue
You have pasted the output of gpstop.
gpstop error: postmaster.pid file does not exist. is Greenplum
instance already stopped?
Which means that the database is not running.

Can't start teamcity server due to Unexpected excetion SQLException/HsqlException

I can't start my Teamcity server on my local machine. It is giving Teamcity server startup error.
The error is : Unexpected exception SQLException/HsqlException: SQL error when doing: Taking a connection from the data source
SQL exception: error in script file line: C:\ProgramData\JetBrains\TeamCity\system\buildserver 45
Anyone have any idea?
Thank you in advance.
Most probably the error means that HSQL DB is corrupted. The solution is to restore from backup.

Derby connection error: ERROR XBM0H: Directory /usr/opt/derby/db-derby-10.12.1.1-bin/bin/MyDbTest cannot be created

I am trying to setup Derby on my Mac following these instructions... Tutorial
When I try to run connect 'jdbc:derby:MyDbTest;create=true'; in ij I get the following error
ERROR XJ041: Failed to create database 'MyDbTest', see the next exception for details.
ERROR XBM0H: Directory /usr/opt/derby/db-derby-10.12.1.1-bin/bin/MyDbTest cannot be created.
I have tried googling this error a bit now with no success...
I also get a thread "main" java.lang.NoClassDefFoundError: org/apache/derby/tools/ij when trying to run as super user.
This should be a Permissions issue, try running all these commands throught a directory you have full permissions to such as ~/Documents/Derby.

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