If you have ever looked at the console or logs while starting a Tomcat instance on Windows you have probably seen the following line about APR.
INFO: The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path
As long as the “tcnative-1.dll” is in the Windows PATH, generally you can place it in c:\windows\system32, but any other location in the PATH will work should you need it to be portable, or have different versions in use.
NOTE: Other Operating Systems use a similar approach as Windows to add an environmental variable, optionally you can also add the appropriate location to the “java.library.path” attribute used when calling the VM, if you are more technically inclined. Also, be aware of 32 vs. 64 bit architectures when selecting your version!