Program: 103331
Project: 103331
Buggy source:
/** 
 * Modifies the account corresponding to the specified accountID. This method is meant to be used to change properties of already existing accounts. Note that if the given accountID doesn't correspond to any registered account this method would do nothing.
 * @param protocolProvider the protocol provider service corresponding tothe modified account.
 * @param accountProperties a set of protocol (or implementation) specificproperties defining the new account.
 * @throws java.lang.NullPointerException if any of the arguments is null.
 */
public void modifyAccount(ProtocolProviderService protocolProvider,Map<String,String> accountProperties){
  BundleContext context=SipActivator.getBundleContext();
  if (context == null)   throw new NullPointerException("String_Node_Str");
  if (protocolProvider == null)   throw new NullPointerException("String_Node_Str");
  SipAccountID accountID=(SipAccountID)protocolProvider.getAccountID();
  if (!registeredAccounts.containsKey(accountID))   return;
  ServiceRegistration registration=registeredAccounts.get(accountID);
  if (registration != null) {
    try {
      if (protocolProvider.isRegistered()) {
        protocolProvider.shutdown();
      }
    }
 catch (    Throwable e) {
    }
    registration.unregister();
  }
  if (accountProperties == null)   throw new NullPointerException("String_Node_Str");
  if (!accountProperties.containsKey(PROTOCOL))   accountProperties.put(PROTOCOL,ProtocolNames.SIP);
  Map<String,String> oldAcccountProps=accountID.getAccountProperties();
  accountID.setAccountProperties(accountProperties);
  this.storeAccount(accountID);
  String userIDStr=accountProperties.get(USER_ID);
  Hashtable<String,String> properties=new Hashtable<String,String>();
  properties.put(PROTOCOL,ProtocolNames.SIP);
  properties.put(USER_ID,userIDStr);
  try {
    Exception initializationException=null;
    try {
      ((ProtocolProviderServiceSipImpl)protocolProvider).initialize(userIDStr,accountID);
    }
 catch (    Exception ex) {
      initializationException=ex;
      accountID.setAccountProperties(oldAcccountProps);
    }
    this.storeAccount(accountID);
    registration=context.registerService(ProtocolProviderService.class.getName(),protocolProvider,properties);
    registeredAccounts.put(accountID,registration);
    if (initializationException != null)     throw initializationException;
  }
 catch (  Exception ex) {
    logger.error("String_Node_Str",ex);
    throw new IllegalArgumentException("String_Node_Str" + ex.getMessage());
  }
}

Fixed version (ground truth):
/** 
 * Modifies the account corresponding to the specified accountID. This method is meant to be used to change properties of already existing accounts. Note that if the given accountID doesn't correspond to any registered account this method would do nothing.
 * @param protocolProvider the protocol provider service corresponding tothe modified account.
 * @param accountProperties a set of protocol (or implementation) specificproperties defining the new account.
 * @throws java.lang.NullPointerException if any of the arguments is null.
 */
public void modifyAccount(ProtocolProviderService protocolProvider,Map<String,String> accountProperties){
  BundleContext context=SipActivator.getBundleContext();
  if (context == null)   throw new NullPointerException("String_Node_Str");
  if (protocolProvider == null)   throw new NullPointerException("String_Node_Str");
  SipAccountID accountID=(SipAccountID)protocolProvider.getAccountID();
  if (!registeredAccounts.containsKey(accountID))   return;
  ServiceRegistration registration=registeredAccounts.get(accountID);
  if (registration != null) {
    try {
{
        protocolProvider.shutdown();
      }
    }
 catch (    Throwable e) {
    }
    registration.unregister();
  }
  if (accountProperties == null)   throw new NullPointerException("String_Node_Str");
  if (!accountProperties.containsKey(PROTOCOL))   accountProperties.put(PROTOCOL,ProtocolNames.SIP);
  Map<String,String> oldAcccountProps=accountID.getAccountProperties();
  accountID.setAccountProperties(accountProperties);
  this.storeAccount(accountID);
  String userIDStr=accountProperties.get(USER_ID);
  Hashtable<String,String> properties=new Hashtable<String,String>();
  properties.put(PROTOCOL,ProtocolNames.SIP);
  properties.put(USER_ID,userIDStr);
  try {
    Exception initializationException=null;
    try {
      ((ProtocolProviderServiceSipImpl)protocolProvider).initialize(userIDStr,accountID);
    }
 catch (    Exception ex) {
      initializationException=ex;
      accountID.setAccountProperties(oldAcccountProps);
    }
    this.storeAccount(accountID);
    registration=context.registerService(ProtocolProviderService.class.getName(),protocolProvider,properties);
    registeredAccounts.put(accountID,registration);
    if (initializationException != null)     throw initializationException;
  }
 catch (  Exception ex) {
    logger.error("String_Node_Str",ex);
    throw new IllegalArgumentException("String_Node_Str" + ex.getMessage());
  }
}