code: protected void unpack(File file, File location, String logName, boolean overwrite, String[] includes,
          String[] excludes) throws MojoExecutionException
      {
          try {
              ZipUnArchiver unArchiver = new ZipUnArchiver();
              unArchiver.setEncoding(this.encoding);
              unArchiver.enableLogging(new ConsoleLogger(Logger.LEVEL_ERROR, logName));
              unArchiver.setSourceFile(file);
              unArchiver.setDestDirectory(location);
  
              FileSelector[] selectors;
  
              IncludeExcludeFileSelector fs = new IncludeExcludeFileSelector();
              fs.setIncludes(includes);
              fs.setExcludes(excludes);
  
              // Ensure that we don't overwrite XML document files present in this project since
              // we want those to be used and not the ones in the dependent XAR.
              unArchiver.setOverwrite(overwrite);
  
              if (!overwrite) {
                  // Do not unpack any package.xml file in dependent XARs. We'll generate a complete
                  // one automatically.
                  IncludeExcludeFileSelector fs2 = new IncludeExcludeFileSelector();
                  fs2.setExcludes(new String[] {PACKAGE_XML});
                  selectors = new FileSelector[] {fs, fs2};
              } else {
                  selectors = new FileSelector[] {fs};
              }
  
              unArchiver.setFileSelectors(selectors);
  
              unArchiver.extract();
          } catch (Exception e) {
              throw new MojoExecutionException(String.format("Error unpacking file [%s] to [%s]", file, location), e);
          }
      }
docs: Unpacks the XAR file (exclude the package.xml file if it exists).
  
  @param file the file to be unpacked.
  @param location the location where to put the unpacket files.
  @param logName the name use with {@link ConsoleLogger}.
  @param overwrite indicate if extracted files has to overwrite existing ones.
  @throws MojoExecutionException error when unpacking the file.