Hand-crafted spin loops for thread completion?

[Kenneth Heafield]

The thread object has a join(). There shouldn't be a busy loop here:

pdf-extract/PDFExtract/appClientModule/com/java/app/PDFExtract.java

Line 353 in c1d9f74

 while (countThreadExtract > 0) { 

[dionwiggins]

Changed to use Executor.

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

Major changed made to Extract and AddThreadExtract functions.