I am trying to compile and load dynamically generated Java code during runtime. Since both ClassLoader::defineClass and Unsafe::defineAnonymousClass have serious drawbacks in this scenario, I tried using hidden classes via Lookup::defineHiddenClass instead. This works fine for all classes that I tried to load…
Tag: java-15
What is the Text Blocks (or Multiline Strings) feature in Java?
Java SE 13 introduced Text Blocks (or Multiline Strings) feature. What are its differences and the similarities with the existing string representation? Answer What is a text block? A text block is a multi-line string literal and the feature offers a clean way to format the string in a predictable way, withou…
NetBeans 12.0: “Class does not have a main method” (but it does)
NetBeans 12.0 Jdk 15 I cannot launch my program, clicking the green run button doesn’t do anything, and right click + run file on MainFrame gives the error “Class does not have a main method”. But as you can see in the GIF below, it does have a main(String args[]). Does anyone have any idea …
Java generics impossible assignment?
Every time I think I understand generics better (and can answer without compiling), I get to an example where this theory breaks. Here is a very simple example: And two invocations: To me, none of the invocations should compile. A String is not a supertype of List. Still, the second one compiles. But let̵…
Specific JDK in eclipse.ini for Eclipse IDE version 2020-09 use JDK 15, not default JDK what declared in system environment variable
Eclipse 2020-09, Error: I must set Java environment to JDK 1.8 for Gradle work correctly in some case. File eclipse.ini but Eclipse still not start. My JDKs in my PC: How to declare JDK 15 to eclipse.ini ? Answer -vm and C:Program FilesJavajdk-15binjavaw.exe have to be two lines directly before the line -vmar…