Check jar function

CheckJar.java

public void checkJar() {
  java.io.File jarFile = null;
  try {
    jarFile = new java.io.File("/var/lib/solr/tomcat-deployment/webapps/solr/WEB-INF/lib/antlr-runtime-3.5.jar");
    System.out.println("^^^^^^^^jar exists = " + jarFile.exists());
    System.out.println("^^^^^^^^jar canRead = " + jarFile.canRead());
  } catch ( Exception e ) {
    e.printStackTrace();
  }
}

// After ServletFilter init(...) method,
// ^^^^^^^^jar exists = true
// ^^^^^^^^jar canRead = true
// After ServletFilter destroy(...) method,
// ^^^^^^^^jar exists = false
// ^^^^^^^^jar canRead = false