Simply downloading the JDK won't "give you" a tools.jar file because the JDK now stores those files in a more efficient, internal format in the lib directory. How to Fix "Could Not Find tools.jar" in Java 11
In older versions like Java 8, tools.jar contained internal classes for the compiler and other development tools. Starting with Java 9, these classes were moved into the . tools.jar java 11 download
You should download the full Java SE 11 JDK from Oracle or OpenJDK 11 from jdk.java.net . Simply downloading the JDK won't "give you" a tools
The short answer is that . It was permanently removed starting with JDK 9 as part of the modularity project (JEP 220). You should download the full Java SE 11
If you are seeing a "Could not find tools.jar" error while using Java 11, it is usually because an older tool (like an outdated version of Ant, Maven, or Hadoop) is looking for a file that no longer exists in modern Java versions. Why You Can't Download tools.jar for Java 11
If your application or build script is failing with this error, use these strategies: Stack Overflow How to get tools.jar for OpenJDK 11 on Windows?