Technical Tips and Techniques by Ravindra Gullapalli

Copy-paste stops working on Windows 7

noreply@blogger.com (Ravindra Gullapalli) — Sun, 05 Jul 2026 05:56:00 +0000

If copy paste is not working in Windows 7, following steps (Posted here)

1. Go to Start

2. Go to Run

3. Type the following in the search box: cmd /c “echo off | clip” then hit Enter.

WinSCP error - The parameter is incorrect

noreply@blogger.com (Ravindra Gullapalli) — Sun, 15 Feb 2026 13:46:00 +0000

While connecting to a FTP site, you might get this error after successful authentication.

THE PARAMETER IS INCORRECT

If you try in windows explorer, you might get this kind of error

451 - THE PARAMETER IS INCORRECT

This can be fixed in WinSCP by following below steps

1. Go to Tabs > Sites > Site Manager

2. Select the FTP site you want to fix and click on Edit Button and then Advanced Button.

3. Click on Connection in the left panel and Choose IPv4 in Internet protocol version.

This should solve the issue.

Ubuntu Upgrade from 18.04 to 20.04 - Issue with MySQL

noreply@blogger.com (Ravindra Gullapalli) — Tue, 21 Oct 2025 04:58:00 +0000

While upgrading from Ubuntu 18.04 to Ubuntu 20.04 (as a non-root user), you may get stuck in upgrading MySQL 5.7 to MySQL 8.0. How can we over come this?

Connect to the Ubuntu system from an SSH
Check the MySQL processes

sudo ps aux | grep mysql

Kill all the processes

sudo kill -9 <Process ID / PID 1>, <Process ID / PID 2>, <Process ID / PID 3> ...

NOTE:After upgrading Ubuntu, you have to manually install OR configure MySQL as root user

Firefox - Multi-Account Containers Extension - Add Long Container Names

noreply@blogger.com (Ravindra Gullapalli) — Wed, 13 Aug 2025 14:56:00 +0000

Firefox has a beautiful extension Multi-Account Containers. This enables to manage different sessions of different account without conflicts.

When you tried to add a new container using Manage Containers button, you may endup with limited number of characters (25)

Follow below steps to add long names to the Containers in Multi-Account Container Extension in Firefox

1. In a new tab, go to about:preferences#containers

You will see something like this

Scroll down to fine Add New Container button. Click on that and give long meaningful name. Not sure how many characters it supports here. I tried with 100 characters.

Hope this will be a help for someone looking for such solution.

MySQL ERROR 1418 (HY000): This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled

noreply@blogger.com (Ravindra Gullapalli) — Fri, 08 Aug 2025 14:27:00 +0000

While restoring the MySQL dump, we may come across the following error

ERROR 1418 (HY000): This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled

This happens because MySQL prevents function OR procedure creation in restore when binary logging is on.

To avoid this, temporarily enable "Trust Function Creators" using below statement

mysql -u root -p -e "SET GLOBAL log_bin_trust_function_creators = 1;"

Do the restore

[Do your restore]

Disable the flag again

mysql -u root -p -e "SET GLOBAL log_bin_trust_function_creators = 0;"

ASP.NET - Web Services - Web Service method name is not valid

noreply@blogger.com (Ravindra Gullapalli) — Sun, 03 Aug 2025 15:18:00 +0000

I got the error "Web Service method name is not valid" in one of my legacy ASP.NET WebService application while accessing from postman. In the browser I was able to access the asmx and the method structure. But in postman it was failing.

While doing research I found multiple reasons for that. In my case the issue was it has "ByRef" parameters.

Listing out all the reasons and will update if I found anything new.

When accessing your web service through postman, make sure that

1. You don't have ByRef parameters

2. The method is public (Reference)

3. The method is not static (Reference)

4. The class name in the asmx file matches with the class name in which this method (message) is present (Reference)

5. In the Webservice URL the combination of asmx and the Web service method name (message name) is correct

Intellij Idea Error in Maven - SLF4J: Class path contains multiple SLF4J bindings

noreply@blogger.com (Ravindra Gullapalli) — Mon, 28 Jul 2025 08:59:00 +0000

When I was building a spring boot project using maven in IntelliJ Idea, I observed the below error. Even if it does not cause any issue in the build process, it is irritating.

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:[idea home path]/idea/plugins/maven/lib/maven3/lib/maven-slf4j-provider-3.9.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:[idea home path]/idea/plugins/maven/lib/maven3/lib/maven-slf4j-provider-3.9.9.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [org.slf4j.impl.MavenSimpleLoggerFactory]
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:[idea home path]/idea/plugins/maven/lib/maven3/lib/maven-slf4j-provider-3.9.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:[idea home path]/idea/plugins/maven/lib/maven3/lib/maven-slf4j-provider-3.9.9.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.MavenSimpleLoggerFactory]

To avoid this, search for

/maven3/lib/maven-slf4j-provider-3.9.8.jar
/maven3/lib/maven-slf4j-provider-3.9.9.jar

And remove maven-slf4j-provider-3.9.8.jar

That should resolve the issue.

Github - Get code at a specific commit

noreply@blogger.com (Ravindra Gullapalli) — Sun, 12 May 2024 08:06:00 +0000

Follow below mentioned steps to get the code at a given commit

1. Go to the repository and click on Code Tab

2. Choose desired branch

3. Click on Number of commits

4. Click on Code icon before next to the desired commit

5. Click on Code dropdown

6. Click on Download Zip

IntelliJ IDE - No Suggestions

noreply@blogger.com (Ravindra Gullapalli) — Tue, 23 Apr 2024 13:59:00 +0000

Some times, IntelliJ IDE won't give you suggestions and provides No Suggestions tooltip.

To solve this, follow the procedure mentioned here

File -> Invalidate caches...
Restart IntelliJ IDEA.

Ubuntu - IntelliJ IDE - Keyboard is not working / Not able to type

noreply@blogger.com (Ravindra Gullapalli) — Tue, 23 Apr 2024 13:56:00 +0000

When you work with IntelliJ IDE in Ubuntu, suddenly the keyboard stops working and you can't type anything.

As mentioned here, this is an issue with ibus.

To resolve this, runthe command

ibus restart

No need to start the IDE. You will be able to type in the IDE again.

Ubuntu - MySQL - convert_tz returns null

noreply@blogger.com (Ravindra Gullapalli) — Tue, 21 Nov 2023 02:42:00 +0000

In Ubuntu, convert_tz function in MySQL was returning NULL for me.

To handle this, I used this solution mentioned here. PFB the steps for quick reference.

Go to Terminal

Execute the command

mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql

Now, convert_tz will return a non NULL value

Visual Studio Code (VSCode) : The build file has been changed and may need reload to make it effective. OR The problems window is not recognizing issues OR intellisense (auto complete) is not working

noreply@blogger.com (Ravindra Gullapalli) — Wed, 11 Oct 2023 06:41:00 +0000

If you

1.Get the above error in VS Code for your java projects like this

2.The problems window is not recognizing issues

3.Intellisense (auto complete) is not working

All you have to do is

Right click on pom.xml
Click on "Reload Projects"

That should fix above three issues.

Ubuntu / Kubuntu - Postman Export - Save Dialog shows Boxes

noreply@blogger.com (Ravindra Gullapalli) — Thu, 28 Sep 2023 02:33:00 +0000

I have installed postman using snap and tried to export a collection. My save dialog shows boxes which are not readable.

Whenever this happens, follow the below steps.

Close Postman
Run below command in terminal (Reference)

rm -rf ~/snap/postman/common/.cache

Start Postman

IDE / Code Editor - Replace Blank Lines - Intellij IDEA / Visual Studio / Visual Studio Code / Netbeans / Eclipse / STS

noreply@blogger.com (Ravindra Gullapalli) — Fri, 02 Jun 2023 16:35:00 +0000

IntelliJ IDEA / Visual Studio / Visual Studio Code / Netbeans / Eclipse / STS

Press Ctrl + R

Search for ^\s*$\n

Select Regex button (.*)

Click on Replace All

IDE / Code Editor - Standard Shortcut Keys - Netbeans / Eclipse / STS / Intellij IDEA / Visual Studio / Atom / Notepad ++ / VS Code / Nano

noreply@blogger.com (Ravindra Gullapalli) — Mon, 21 Mar 2022 12:16:00 +0000

Function / Feature	Netbeans	Eclipse / STS	Intellij IDEA	Visual Studio	Notepad++	Nano
Go To File / Find File	ALT + Shift + O	Shift + Ctrl + R	Shift + Ctrl + N	Ctrl + ;
Find In File	Ctrl + F	Ctrl + F	Ctrl + F	Ctrl + F
Replace In File	Ctrl + R	Ctrl + F	Ctrl + R	Ctrl + H
Find Across Files	Shift + Ctrl + F	Ctrl + H	Shift + Ctrl + F	Shift + Ctrl + F
Replace Across Files	Shift + Ctrl + R	Ctrl + H	Shift + Ctrl + R	Shift + Ctrl + R
Organize Imports	Shift + Ctrl + I	Shift + Ctrl + O	Alt + Ctrl + O
Convert to Upper Case		Shift + Ctrl + X
Convert to Lower Case		Shift + Ctrl + Y				Shift + Ctrl + P (And search for transform and choose the right option)
Delete Line				Shift + Delete	Ctrl + L

Wildfly : security.properties & ejb.properties not found

noreply@blogger.com (Ravindra Gullapalli) — Tue, 14 Dec 2021 14:51:00 +0000

While starting wildfly, if you get security.properties not found OR ejb.properties not found error, make sure that you do not include j2ee*.jar in your war file

Credits : https://developer.jboss.org/thread/73659

Ubuntu : Apache2 : AH01144: No protocol handler was valid for the URL / (scheme 'http'). If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

noreply@blogger.com (Ravindra Gullapalli) — Sun, 22 Aug 2021 06:39:00 +0000

If you get the below error,

AH01144: No protocol handler was valid for the URL / (scheme 'http'). If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule.

Then enable necessary proxy modules using below commands (Credits)

sudo a2enmod ssl
sudo a2enmod proxy
sudo a2enmod proxy_balancer
sudo a2enmod proxy_http

WiFi Network List not loading in Ubnuntu Focal Fossa In Lenovo G510

noreply@blogger.com (Ravindra Gullapalli) — Sun, 08 Aug 2021 19:53:00 +0000

When you install Ubuntu Focal Fossa OR any other distro like pearOS Monterey in Lenovo G510 laptop (Generally Broadcom Card is available in this), you can see that WiFi network list is not loaded by default.

To resolve this, run the following commands.

sudo apt install linux-headers-generic

sudo apt install bcmwl-kernel-source (Ignore FATAL Error WL Not Found)

sudo apt install linux-headers-$(uname -r)

sudo apt install --reinstall bcmwl-kernel-source

Credits : https://askubuntu.com/a/811015/103478 and https://askubuntu.com/a/1320674/103478

Error - The transaction associated with the current connection has completed but has not been disposed

noreply@blogger.com (Ravindra Gullapalli) — Sun, 16 May 2021 13:37:00 +0000

In .NET, you may come across the below error when you use TransactionScope.

Error - The transaction associated with the current connection has completed but has not been disposed

The root cause is transaction Time Out by default it is 10 Minutes. Two possible solutions are 1. Provide explicit time out when defining TransactionScope like this.

using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required, new System.TimeSpan([Hours], [Minutes greater than 10], [Seconds]))){ // Your code }

Some times this won't work. Another possible solution (Courtesy : https://stackoverflow.com/a/21274884/341117) is tweaking

C:\Windows\Microsoft.NET\Framework\[Version]\Config\machine.config

Note : While doing this, take absolute care. Take a back up and then edit. Wrongly editing this will stop your Visual Studio, SQL Server Management Studio and whichever applications are dependent on .NET Framework. Add the below node in that file at the end of the file before end configuration node.

Make sure that you add at the end. If you add it in the beginning, all applications depend on .NET Framework will stop working.

Wordpress - Elementor Plugin - The response is not a valid JSON response OR The preview could not be loaded Not Found 404 error

noreply@blogger.com (Ravindra Gullapalli) — Mon, 26 Apr 2021 09:28:00 +0000

When you try to edit a page using Elementor plugin, you might come across the following issues

To get rid of this,

1. Change Memory setting and increase memory to minimum 256M

In wp-config.php file add the line

define('WP_MEMORY_LIMIT', '256M');

2. Change permalink setting to Plain.

That should do the magic.

Wordpress - Always redirects to HTTPS in Local machine even if it is not configured

noreply@blogger.com (Ravindra Gullapalli) — Mon, 26 Apr 2021 09:19:00 +0000

When you want to test the word press site in local, you might come across this situation that it always redirects to HTTPS page and does not work.

Possible reasons are

1. .htaccess file configuration is set to redirect to HTTPS always

2. Server configuration is set to redirect to HTTPS always (Apache / Nginx)

3. A plugin might be causing this. Example plugins are listed below.

3.1 really-simple-ssl

Also you may add the below two lines in your wp-config.php file

define('FORCE_SSL', false);
define('FORCE_SSL_ADMIN', false);

Firefox - Secure Connection Failed - Error code: SEC_ERROR_REVOKED_CERTIFICATE

noreply@blogger.com (Ravindra Gullapalli) — Mon, 19 Apr 2021 07:46:00 +0000

NOTE: Do this at your risk only for the websites you know and trust.

Sometimes when you open a website in Firefox, you might see the below error. The same website might work properly in Google Chrome.

You have two options to handle this situation

Use Google Chrome to access the website
If you a Firefox user like me, follow the below steps (Credits : https://stackoverflow.com/a/47764310/341117)

Open about:config
Click on Accept Risk and Continue
Search for security.OCSP.enabled
Click on Edit (Pencil) icon
Change it to 0 from 1
That is all

The code of method _jspService(HttpServletRequest, HttpServletResponse) is exceeding the 65535 bytes limit

noreply@blogger.com (Ravindra Gullapalli) — Sat, 17 Apr 2021 10:03:00 +0000

This happens if have too many include directives

<%@include ... %>

Try to avoid them as much as possible use jsp:include tag

<jsp:include ...></jsp:include>

JBoss / WildFly - java.lang.OutOfMemoryError: Metaspace error

noreply@blogger.com (Ravindra Gullapalli) — Sat, 08 Aug 2020 05:22:00 +0000

In recent days, I observed WildFly server is giving an error

java.lang.OutOfMemoryError: Metaspace error

and the server terminates OR stops serving your requests.

This was happening when I redeploy an application of keep the server on for certain time.

I did little research and found that we need to tweak the configuration of JBoss / WildFly server to increase meta space. Do not increase it too much as we need to maintain balance between meta space and heap.

To do that open [WildFly / JBoss home]/bin/standalone.conf

Search for -XX:MaxMetaspaceSize

There you would find -XX:MaxMetaspaceSize=256m

Change it to -XX:MaxMetaspaceSize=512m

It looks something like this

Restart the server and you are done.

error installing libreoffice trying to overwrite '/usr/bin/soffice', which is also in package openoffice-debian-menus

noreply@blogger.com (Ravindra Gullapalli) — Wed, 15 Jul 2020 12:55:00 +0000

While installing libreoffice after uninstalling openoffice, I received the error

error installing libreoffice trying to overwrite '/usr/bin/soffice', which is also in package openoffice-debian-menus
To solve this, there is a solution suggested here which I am giving for quick reference.

sudo dpkg -P openoffice-debian-menus
sudo apt --fix-broken install