Adjust VirtualBox VMS BIOS time

Syntax

   VBoxManage modifyvm "VMS Name" --biossystemtimeoffset -ms

   Note:
   ms - milliseconds


For example

   VBoxManage modifyvm "VMS Name" --biossystemtimeoffset -86400000

Kalman filter

Just finding some resources for learning about Kalman filter, seems it is a very useful technique which applicable on a lot of different areas.

References:

https://blog.maddevs.io/reduce-gps-data-error-on-android-with-kalman-filter-and-accelerometer-43594faed19c

Conflict between pandas 0.25.0 and pandas-datareader 0.7.0

For Python users, there is a conflict between "pandas 0.25.0" and "pandas-datareader 0.7.0".

If you do an "from pandas_datareader import data", you will got a conflict:

    "ImportError: cannot import name StringIO from pandas.compat"

To get rid of this issue, use "pandas 0.24.2" + "pandas-datareader 0.7.0" instead.

Linux mounted NTFS partition as read-only suddenly

Sometimes in dual boot system (Windows / Linux), the NTFS partitions might have some problem causing the Linux mounted the NTFS partitions as read-only. To solve this problem, one might try following to see if it works:

Step 1: Unmount the partition first

This can be done via Disks application OR command line:

• e.g. umount -v /dev/sda1

Step 2: Run ntfsfix on the target partition

• e.g. sudo ntfsfix /dev/sda1

If the command is successful, the following output should be shown:

  Mounting volume... The disk contains an unclean file system (0, 0).

  Metadata kept in Windows cache, refused to mount.

  FAILED

  Attempting to correct errors... 

  Processing $MFT and $MFTMirr...

  Reading $MFT... OK

  Reading $MFTMirr... OK

  Comparing $MFTMirr to $MFT... OK

  Processing of $MFT and $MFTMirr completed successfully.

  Setting required flags on partition... OK

  Going to empty the journal ($LogFile)... OK

  Checking the alternate boot sector... OK

  NTFS volume version is 3.1.

  NTFS partition /dev/sda1 was processed successfully.

Step 3: Remount the partition

    The partition should be read-write enabled

NFC notes on NDEF message for URL

Just a note for encoding URL in NDEF message, the NDEF record should user TNF_WELL_KNOWN as its TNF. And NDEF record type should be RTD_URI. And the first byte could be encoded for different protocols (e.g. 0x01 = "http://www", 0x02 = "https://www", etc.

References:
Beginning NFC
Professional NFC Application Development for Android

Spring Boot Application Properties List

The list of Spring Boot Application Common Properties:

https://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html

Resources for jQuery i18n library

jQuery i18n is a handy library to provide multi-language for your web applications. Below are some useful references:

• The Advanced Guide to jQuery i18n

Inject git last commit id to SpringBoot project

1) Add git-commit-id-plugin in pom.xml

  <build>
  <plugins>
  <plugin>

      <groupId>pl.project13.maven</groupId>

      <artifactId>git-commit-id-plugin</artifactId>

      <executions>

          <execution>

              <goals>

                  <goal>revision</goal>

              </goals>

          </execution>

      </executions>

      <configuration>

          <dotGitDirectory>${project.basedir}/.git</dotGitDirectory>

          <includeOnlyProperties>

              <includeOnlyProperty>git.commit.id.abbrev</includeOnlyProperty>

          </includeOnlyProperties>

      </configuration>

  </plugin>
  ...
  </plugins>
  </build>

2) Get the value via Thymeleaf

   <head th:with="abbrev=${@environment.getProperty('git.commit.id.abbrev')}">

Strange blue border in MapView of ArcGIS JS 4

Starting from ArcGIS JS 4.x, under some special conditions, the MapView will have a blue border when the MapView is focus, who genius get this geneless idea?

To get rid of this stupid box, style the following:

.esri-view-surface--inset-outline::after {   
    outline: none !important;
    padding: 0px !important;
}

So when this stupid design will come out? When ever your HTML got the following conditions, that stupid box will be shown when MapView is on focus:

body {
    margin: 0;
} 

#mapDiv {
    width: 100%
}

... The most weird API ever encountered

Updating graphic in ArcGIS JS 4.x GraphicsLayer

Esri still don't have a clue on how to modify a graphic in GraphicsLayer directly at version 4.8.

You still need to clone the graphic, remove the existing one, and add the new one to realize the modification.

Ref:

https://developers.arcgis.com/javascript/latest/guide/functionality-matrix/index.html#graphicslayer

Stone age API.