In method javax.swing.plaf.basic.BasicFileChooserUI$GlobFilter.setPattern(String) there is an assignment to a local object called "buf", but it is never used in the method.

public class BasicFileChooserUI extends FileChooserUI {
[--snip--]
    class GlobFilter extends FileFilter {
Pattern pattern;
String globPattern;

public void setPattern(String globPattern) {
char[] gPat = globPattern.toCharArray();
char[] rPat = new char[gPat.length * 2];
boolean isWin32 = (File.separatorChar == '\\');
boolean inBrackets = false;
StringBuffer buf = new StringBuffer(); // <-----------here
int j = 0;
[--snip--]

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