Null safe expression in Thymeleaf

Using '?' after the variable in Thymeleaf expression, that variable will be null safe.

<td th:text="${user.department?.name}"></td>

For the avoid example, even variable department is null, the expression will still be fine.

OpenLayers blurry map with ArcGIS tiles

Check this out:

https://github.com/openlayers/openlayers/issues/6430

Skip testing in Maven

To skip the unit testing in Maven, we need to set the environment variable "maven.test.skip" to true. Or we can use "-DskipTests"

Sample command:

Prompt> mvn package -Dmaven.test.skip=true

OR

Prompt> mvn package -DskipTests

Reference:

https://www.mkyong.com/maven/how-to-skip-maven-unit-test/

Query windows patch via command line

To check if a windows patch (e.g. KB1234567) has been installed, run the following command line:

     C:> wmic qfe | find "1234567"