docs: private static void setSystemClassLoaderClassPath() throws Exception {
          Log.d("Setting classpath");
          // We use agent class as we do not extract this class in newly created
          // jar (otherwise we may end up creating one -magic jar from another);
          // also it will exist even without JUnit classes).
          URL url = EkstaziAgent.class.getResource(EkstaziAgent.class.getSimpleName() + ".class");
          String origPath = url.getFile().replace("file:", "").replaceAll(".jar!.*", ".jar");
          File junitJar = new File(origPath);
          File xtsJar = new File(origPath.replaceAll(".jar", "-magic.jar"));
  
          boolean isCreated = false;
          // If extracted (Tool) jar is newer than junit*.jar, there is no reason
          // to extract files again, so just return in that case.
          if (FileUtil.isSecondNewerThanFirst(junitJar, xtsJar)) {
              // We cannot return here, as we have to include jar on the path.
              isCreated = true;
          } else {
              // Extract new jar as junit.jar is newer.
              String[] includePrefixes = { Names.EKSTAZI_PACKAGE_BIN };
              String[] excludePrefixes = { EkstaziAgent.class.getName() };
              isCreated = JarXtractor.extract(junitJar, xtsJar, includePrefixes, excludePrefixes);
          }
  
          // Add jar to classpath if it was successfully created, otherwise throw
          // an exception.
          if (isCreated) {
              addURL(xtsJar.toURI().toURL());
          } else {
              throw new RuntimeException("Could not extract Tool classes in separate jar.");
          }
      }