Jacky Liu

Problem IntelliJ IDEA 2025.3 reports a false nullability warning when calling ContainerUtil.map2SetNotNull() with a lambda that returns null. The inspection incorrectly requires the lambda return t...

Symptoms IntelliJ IDEA displays a false error or warning on valid Java ternary expressions. The code compiles and runs correctly, but the editor highlights it as an error. import java.util.Objects;...

Problem Spring Boot Actuator properties such as management.endpoints.enabled-by-default, management.endpoint.health.show-details, or management.endpoints.web.exposure.include are marked as unrecogn...

Question: Using Tomcat HotSwap with classes and resources (.jsp, .css, .js, etc.) works fine in this case, but when I update any configuration file in my application (.properties file), HotSwap doe...

Workaround This plugin is bundled, thus you can remove it manually at present by removing the bundled one from the IDE's installation folder. 1. locate your IDE's installation folder and the bundl...

Question How do we get the "New Dark" color scheme, which was removed in IntelliJ IDEA 2023.1 RC? Answer The "New Dark" color scheme is now available as a plugin https://plugins.jetbrains.com/plug...

Problem A TestNG project used worked with 2021.1.3. However, after the user installed 2024.1, running the same testng run config stopped working due to the error below. The test suite opens a brows...

Problem A user has a perpetual fallback license for IDEA 2024.3, but he can't activate it in China (UTC+8) or India (UTC+5). Cause A timezone-related bug in release 2024.3.7 caused this issue. Wor...

Question About Inner class may be 'static' (version 2025.2): "When using Java 17 or before" What happened in Java 18+ to make static less important for inner classes? I can't find any info. It's ...

Question There is an action named "Always Select Opened Element", description "When an editor tab is selected, select the corresponding element in this view", where to use it? Answer It's in the St...