Program: 170241
Project: 170241
Buggy source:
@SuppressWarnings("String_Node_Str") Class<?> getSelectedClass(String jar,String jf){
  if (jf.trim().equals("String_Node_Str")) {
    return null;
  }
  String fn=driver.javaFBPJarFile;
  int j=fn.lastIndexOf("String_Node_Str") + 8;
  String seg="String_Node_Str";
  if (0 <= fn.substring(j,j + 1).compareTo("String_Node_Str"))   seg="String_Node_Str";
  String owner="String_Node_Str";
  if (0 <= fn.substring(j,j + 3).compareTo("String_Node_Str"))   owner="String_Node_Str";
  Class<?> cls;
  URLClassLoader classLoader=null;
  try {
    try {
      File jFile=new File(fn);
      URI uri=jFile.toURI();
      URL url=uri.toURL();
      URL[] urls=new URL[]{url};
      classLoader=new URLClassLoader(urls);
    }
 catch (    Exception e) {
      System.err.println("String_Node_Str");
      e.printStackTrace();
      return null;
    }
    Class<?> compClass=classLoader.loadClass("String_Node_Str" + owner + "String_Node_Str"+ seg+ "String_Node_Str");
    Class<?> networkClass=classLoader.loadClass("String_Node_Str" + owner + "String_Node_Str"+ seg+ "String_Node_Str");
    Class<?> subnetClass=classLoader.loadClass("String_Node_Str" + owner + "String_Node_Str"+ seg+ "String_Node_Str");
    int i=jf.lastIndexOf("String_Node_Str");
    if (i != -1)     jf=jf.substring(0,i);
    jf=jf.replace('/','.');
    cls=this.classLoader.loadClass(jf);
    if (cls.equals(compClass) || cls.equals(networkClass) || cls.equals(subnetClass)) {
      return null;
    }
    Class cs=cls.getSuperclass();
    if (cs != compClass || cs != subnetClass) {
      MyOptionPane.showMessageDialog(driver.frame,"String_Node_Str");
      return null;
    }
    boolean mainPresent=true;
    try {
      cls.getMethod("String_Node_Str",String[].class);
    }
 catch (    NoSuchMethodException e) {
      mainPresent=false;
    }
catch (    SecurityException e2) {
      mainPresent=false;
    }
    if (mainPresent) {
      MyOptionPane.showMessageDialog(driver.frame,"String_Node_Str");
      return null;
    }
 else {
      return cls;
    }
  }
 catch (  ClassNotFoundException e) {
    System.err.println("String_Node_Str");
    e.printStackTrace();
    return null;
  }
}

Fixed version (ground truth):
@SuppressWarnings("String_Node_Str") Class<?> getSelectedClass(String jar,String jf){
  if (jf.trim().equals("String_Node_Str")) {
    return null;
  }
  String fn=driver.javaFBPJarFile;
  int j=fn.lastIndexOf("String_Node_Str") + 8;
  String seg="String_Node_Str";
  if (0 <= fn.substring(j,j + 1).compareTo("String_Node_Str"))   seg="String_Node_Str";
  String owner="String_Node_Str";
  if (0 <= fn.substring(j,j + 3).compareTo("String_Node_Str"))   owner="String_Node_Str";
  Class<?> cls;
  URLClassLoader classLoader=null;
  try {
    try {
      File jFile=new File(fn);
      URI uri=jFile.toURI();
      URL url=uri.toURL();
      URL[] urls=new URL[]{url};
      classLoader=new URLClassLoader(urls);
    }
 catch (    Exception e) {
      System.err.println("String_Node_Str");
      e.printStackTrace();
      return null;
    }
    Class<?> compClass=classLoader.loadClass("String_Node_Str" + owner + "String_Node_Str"+ seg+ "String_Node_Str");
    Class<?> networkClass=classLoader.loadClass("String_Node_Str" + owner + "String_Node_Str"+ seg+ "String_Node_Str");
    Class<?> subnetClass=classLoader.loadClass("String_Node_Str" + owner + "String_Node_Str"+ seg+ "String_Node_Str");
    int i=jf.lastIndexOf("String_Node_Str");
    if (i != -1)     jf=jf.substring(0,i);
    jf=jf.replace('/','.');
    cls=this.classLoader.loadClass(jf);
    if (cls.equals(compClass) || cls.equals(networkClass) || cls.equals(subnetClass)) {
      return null;
    }
    Class cs=cls.getSuperclass();
    if (cs == null || !(cs == compClass || cs == subnetClass)) {
      MyOptionPane.showMessageDialog(driver.frame,"String_Node_Str");
      return null;
    }
    boolean mainPresent=true;
    try {
      cls.getMethod("String_Node_Str",String[].class);
    }
 catch (    NoSuchMethodException e) {
      mainPresent=false;
    }
catch (    SecurityException e2) {
      mainPresent=false;
    }
    if (mainPresent) {
      MyOptionPane.showMessageDialog(driver.frame,"String_Node_Str");
      return null;
    }
 else {
      return cls;
    }
  }
 catch (  ClassNotFoundException e) {
    System.err.println("String_Node_Str");
    e.printStackTrace();
    return null;
  }
}