ADDITIONAL SYSTEM INFORMATION :
$ sw_vers
ProductName: macOS
ProductVersion: 13.0
BuildVersion: 22A380
$ uname -a
Darwin SID1B560988 22.1.0 Darwin Kernel Version 22.1.0: Sun Oct 9 20:14:54 PDT 2022; root:xnu-8792.41.9~2/RELEASE_X86_64 x86_64
$ java -version
java version "1.8.0_351"
Java(TM) SE Runtime Environment (build 1.8.0_351-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.351-b10, mixed mode)

A DESCRIPTION OF THE PROBLEM :
When compiling the SneakyThrow class, javac reports an error for the method using the infered type as return type. Compilation with a Java 11 javac works just fine.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
$ /Library/Java/JavaVirtualMachines/jdk1.8.0_351.jdk/Contents/Home/bin/javac SneakyThrow.java


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
It should compile without errors.
ACTUAL -
SneakyThrow.java:4: error: unreported exception Throwable; must be caught or declared to be thrown
        sneakyThrow_error_with_javac_8(new Exception());
                                      ^
SneakyThrow.java:8: error: unreported exception Throwable; must be caught or declared to be thrown
        throw sneakyThrow_error_with_javac_8(new Exception());
                                            ^
SneakyThrow.java:8: error: unreported exception Throwable; must be caught or declared to be thrown
        throw sneakyThrow_error_with_javac_8(new Exception());
        ^
3 errors

---------- BEGIN SOURCE ----------
public class SneakyThrow {

    void javac8_error() {
        sneakyThrow_error_with_javac_8(new Exception());
    }

    void javac8_error_with_throws() {
        throw sneakyThrow_error_with_javac_8(new Exception());
    }

    void works() {
        sneakyThrow_works_with_javac_8(new Exception());
    }

    @SuppressWarnings("unchecked")
    <T extends Throwable> T sneakyThrow_error_with_javac_8(Throwable t) throws T {
        throw (T) t;
    }

    @SuppressWarnings("unchecked")
    <T extends Throwable> void sneakyThrow_works_with_javac_8(Throwable t) throws T {
        throw (T) t;
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Omit return type of sneakyThrow method but this excludes uses cases such as:
    int fooBar() {
       try {
           return checkedExceptionThrowingMethod();
       } catch(CheckedException e) {
           throw sneakyThrow(e);
       }
    }
When using sneakyThrow for testing purposes it would require more boiler plate code for more complex scenarios when having to omit the return type.
(Switching to a more recent JDK version is not a valid workaround due to other restrictions.)

FREQUENCY : always