Problem : Application URLs (local urls) not loading in iframe inside an application UI.
Reason : Spring sets the X-Frame-Options to Deny by default.
Fix : Allow Same-origin-URLs in frames.
In Security configuration, add –
[java]
http
.headers().frameOptions().sameOrigin()
.and
.//other configs
[/java]
Add this custom Vaadin servlet to show a different favicon (other than the Vaadin default) in your UI application –
[java]
import com.vaadin.server.*;
import com.vaadin.spring.server.SpringVaadinServlet;
import org.springframework.stereotype.Component;
import javax.servlet.ServletException;
@Component(“vaadinServlet”)
public class CustomServlet extends SpringVaadinServlet {
@Override
protected void servletInitialized() throws ServletException {
super.servletInitialized();
getService().addSessionInitListener((SessionInitListener) event -> event.getSession().addBootstrapListener(new BootstrapListener() {
@Override
public void modifyBootstrapFragment(
BootstrapFragmentResponse response) {
// TODO Auto-generated method stub
}
@Override
public void modifyBootstrapPage(BootstrapPageResponse response) {
response.getDocument().head().
getElementsByAttributeValue(“rel”, “shortcut icon”).attr(“href”, “./images/favicon.png”);
response.getDocument().head()
.getElementsByAttributeValue(“rel”, “icon”)
.attr(“href”, “./images/favicon.png”);
}}
));
}
}
[/java]
Click on any node to find Mohanlal’s relation to that person (default selection is actress Rekha).
Disclaimer : Based of the Whatsapp forward* only, which is given below, and which is unverified.
* one hour hack.
* In case of factual inaccuracies, please get hold of my friend Ajay the banker, who forwarded this to me.
Problem : Openfire server does not listen to port 5222.
Symptoms :
Reason : Unknown – but related to OpenJDK.
Fix : Run OpenFire on Oracle JDK (v8 worked, didn’t test on v9)
For cases where Apache2 is available within the box/local host, but not from LAN, you might have to open port 80 in the firewall.
This is a simple command for that –
[bash]
sudo ufw allow 80/tcp
[/bash]
A reference code to extract a selected shape (this case polygon, could be another shape like Rectangle) –
[java]
BufferedImage in = ImageIO.read(new File(sourceFilePath));
Rectangle bounds = inputPolygon.getBounds(); // Polygon inputPolygon
BufferedImage extractor =new BufferedImage(bounds.width, bounds.height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = extractor.createGraphics();
polygon.translate(-bounds.x, -bounds.y);
g.setClip(polygon);
g.drawImage(in, -bounds.x, -bounds.y, null);
File extImageFile = new File(targetFilePath);
ImageIO.write(extractor, “png”, extImageFile);
[/java]
Problem : Torch installation fails to install dependencies (“bash install-deps”) with the message “Error. OpenBLAS could not be compiled”
Reason : gfortran dependencies could not be located.
Fix : Make sure gfortran and gcc are of the same versions. On terminal –
gcc --version
gfortran --version
sudo update-alternatives --config gcc
Enter the number corresponding to the version of gfortran. (my case 5)
Run install-deps again.Should finish to completion this time.
Problem : After Bluetooth speakers were abruptly switched off, Ubuntu 16.04 on Alienware (17 R2) stopped producing sounds on its analog sound card.
Reason : Doubt an inviable configuration was left behind for the sound card.
Solution :
killall pulseaudio; rm -r ~/.config/pulse/* ; rm -r ~/.pulse*
Reference : https://help.ubuntu.com/community/SoundTroubleshootingProcedure
Go to the link – https://netbeans.org/downloads/
Select Platform as Linux(x86/x64).
Download the installer for NetBeans.
From the terminal, navigate to the directory that contains the installer (netbeans-8.1-linux.sh)
Run the following command to change the permissions –
$ chmod +x netbeans-8.1-linux.sh
Start the installer using the command –
$ ./netbeans-8.1-linux.sh
Follow the steps and NetBeans would be installed.