Program: 21154
Project: 21154
Buggy source:
public void handle(DownloadLink downloadLink) throws Exception {
  try {
    while (waitForNextStartAllowed(downloadLink)) {
    }
  }
 catch (  InterruptedException e) {
    return;
  }
  putLastTimeStarted(System.currentTimeMillis());
  if (!isAGBChecked()) {
    logger.severe("String_Node_Str" + getPluginID());
    downloadLink.getLinkStatus().addStatus(LinkStatus.ERROR_AGB_NOT_SIGNED);
    downloadLink.getLinkStatus().setErrorMessage(JDLocale.L("String_Node_Str","String_Node_Str"));
    return;
  }
  if (downloadLink.isDupeCheckallowed()) {
    if (DownloadInterface.preDownloadCheckFailed(downloadLink))     return;
  }
  Long t=0l;
  if (HOSTER_WAIT_UNTIL_TIMES.containsKey(this.getClass())) {
    t=HOSTER_WAIT_UNTIL_TIMES.get(this.getClass());
  }
  if (!enablePremium || !JDUtilities.getConfiguration().getBooleanProperty(Configuration.PARAM_USE_GLOBAL_PREMIUM,true)) {
    if (t > 0) {
      this.resetHosterWaitTime();
      this.fireControlEvent(ControlEvent.CONTROL_SPECIFIED_DOWNLOADLINKS_CHANGED,JDUtilities.getController().getDownloadLinks(this));
    }
    try {
      handleFree(downloadLink);
      if (dl != null && dl.getConnection() != null) {
        try {
          dl.getConnection().disconnect();
        }
 catch (        Exception e) {
        }
      }
    }
 catch (    PluginException e) {
      e.fillLinkStatus(downloadLink.getLinkStatus());
    }
    return;
  }
  Account account=null;
  ArrayList<Account> disabled=new ArrayList<Account>();
  ArrayList<Account> accounts=getPremiumAccounts();
synchronized (accounts) {
    for (int i=0; i < accounts.size(); i++) {
      Account next=accounts.get(i);
      if (!next.isTempDisabled() && next.isEnabled() && next.getPass() != null && next.getPass().trim().length() > 0) {
        account=next;
        break;
      }
 else       if (next.isTempDisabled() && next.isEnabled()) {
        disabled.add(next);
      }
    }
  }
  if (account != null) {
    try {
      handlePremium(downloadLink,account);
      if (dl != null && dl.getConnection() != null) {
        try {
          dl.getConnection().disconnect();
        }
 catch (        Exception e) {
        }
      }
    }
 catch (    PluginException e) {
      e.fillLinkStatus(downloadLink.getLinkStatus());
    }
synchronized (accounts) {
      if (downloadLink.getLinkStatus().hasStatus(LinkStatus.ERROR_PREMIUM)) {
        if (downloadLink.getLinkStatus().getValue() == LinkStatus.VALUE_ID_PREMIUM_TEMP_DISABLE) {
          logger.severe("String_Node_Str" + account.getUser() + "String_Node_Str");
          account.setTempDisabled(true);
          account.setStatus(downloadLink.getLinkStatus().getErrorMessage());
          getPluginConfig().save();
        }
 else         if (downloadLink.getLinkStatus().getValue() == LinkStatus.VALUE_ID_PREMIUM_DISABLE) {
          account.setEnabled(false);
          account.setStatus(downloadLink.getLinkStatus().getLongErrorMessage());
          getPluginConfig().save();
          logger.severe("String_Node_Str" + account.getUser() + "String_Node_Str");
        }
 else {
          account.setEnabled(false);
          account.setStatus(downloadLink.getLinkStatus().getLongErrorMessage());
          getPluginConfig().save();
          logger.severe("String_Node_Str" + account.getUser() + "String_Node_Str"+ downloadLink.getLinkStatus().getLongErrorMessage());
        }
      }
 else {
        account.setStatus(JDLocale.L("String_Node_Str","String_Node_Str"));
        getPluginConfig().save();
      }
    }
  }
 else {
    if (t > 0) {
      this.resetHosterWaitTime();
      this.fireControlEvent(ControlEvent.CONTROL_SPECIFIED_DOWNLOADLINKS_CHANGED,JDUtilities.getController().getDownloadLinks(this));
    }
    try {
      handleFree(downloadLink);
      if (dl != null && dl.getConnection() != null) {
        try {
          dl.getConnection().disconnect();
        }
 catch (        Exception e) {
        }
      }
    }
 catch (    PluginException e) {
      e.fillLinkStatus(downloadLink.getLinkStatus());
    }
synchronized (accounts) {
      if (disabled.size() > 0) {
        int randId=(int)(Math.random() * disabled.size());
        disabled.get(randId).setTempDisabled(false);
        getPluginConfig().save();
      }
    }
  }
  return;
}

Fixed version (ground truth):
public void handle(DownloadLink downloadLink) throws Exception {
  try {
    while (waitForNextStartAllowed(downloadLink)) {
    }
  }
 catch (  InterruptedException e) {
    return;
  }
  putLastTimeStarted(System.currentTimeMillis());
  if (!isAGBChecked()) {
    logger.severe("String_Node_Str" + getPluginID());
    downloadLink.getLinkStatus().addStatus(LinkStatus.ERROR_AGB_NOT_SIGNED);
    downloadLink.getLinkStatus().setErrorMessage(JDLocale.L("String_Node_Str","String_Node_Str"));
    return;
  }
  if (downloadLink.isDupeCheckallowed()) {
    if (DownloadInterface.preDownloadCheckFailed(downloadLink))     return;
  }
  Long t=0l;
  if (HOSTER_WAIT_UNTIL_TIMES.containsKey(this.getClass())) {
    t=HOSTER_WAIT_UNTIL_TIMES.get(this.getClass());
  }
  if (!enablePremium || !JDUtilities.getConfiguration().getBooleanProperty(Configuration.PARAM_USE_GLOBAL_PREMIUM,true)) {
    if (t > 0) {
      this.resetHosterWaitTime();
      this.fireControlEvent(ControlEvent.CONTROL_SPECIFIED_DOWNLOADLINKS_CHANGED,JDUtilities.getController().getDownloadLinks(this));
    }
    try {
      handleFree(downloadLink);
      if (dl != null && dl.getConnection() != null) {
        try {
          dl.getConnection().disconnect();
        }
 catch (        Exception e) {
        }
      }
    }
 catch (    PluginException e) {
      e.fillLinkStatus(downloadLink.getLinkStatus());
    }
    return;
  }
  Account account=null;
  ArrayList<Account> disabled=new ArrayList<Account>();
  ArrayList<Account> accounts=getPremiumAccounts();
synchronized (accounts) {
    for (int i=0; i < accounts.size(); i++) {
      Account next=accounts.get(i);
      if (!next.isTempDisabled() && next.isEnabled() && next.getPass() != null && next.getPass().trim().length() > 0) {
        account=next;
        break;
      }
 else       if (next.isTempDisabled() && next.isEnabled()) {
        disabled.add(next);
      }
    }
  }
  if (account != null) {
    try {
      handlePremium(downloadLink,account);
      if (dl != null && dl.getConnection() != null) {
        try {
          dl.getConnection().disconnect();
        }
 catch (        Exception e) {
        }
      }
    }
 catch (    PluginException e) {
      e.fillLinkStatus(downloadLink.getLinkStatus());
    }
synchronized (accounts) {
      if (downloadLink.getLinkStatus().hasStatus(LinkStatus.ERROR_PREMIUM)) {
        if (downloadLink.getLinkStatus().getValue() == LinkStatus.VALUE_ID_PREMIUM_TEMP_DISABLE) {
          logger.severe("String_Node_Str" + account.getUser() + "String_Node_Str");
          account.setTempDisabled(true);
          account.setStatus(downloadLink.getLinkStatus().getErrorMessage());
          getPluginConfig().save();
        }
 else         if (downloadLink.getLinkStatus().getValue() == LinkStatus.VALUE_ID_PREMIUM_DISABLE) {
          account.setEnabled(false);
          account.setStatus(downloadLink.getLinkStatus().getLongErrorMessage());
          getPluginConfig().save();
          logger.severe("String_Node_Str" + account.getUser() + "String_Node_Str"+ downloadLink.getLinkStatus().getLongErrorMessage());
        }
 else {
          account.setEnabled(false);
          account.setStatus(downloadLink.getLinkStatus().getLongErrorMessage());
          getPluginConfig().save();
          logger.severe("String_Node_Str" + account.getUser() + "String_Node_Str"+ downloadLink.getLinkStatus().getLongErrorMessage());
        }
      }
 else {
        account.setStatus(JDLocale.L("String_Node_Str","String_Node_Str"));
        getPluginConfig().save();
      }
    }
  }
 else {
    if (t > 0) {
      this.resetHosterWaitTime();
      this.fireControlEvent(ControlEvent.CONTROL_SPECIFIED_DOWNLOADLINKS_CHANGED,JDUtilities.getController().getDownloadLinks(this));
    }
    try {
      handleFree(downloadLink);
      if (dl != null && dl.getConnection() != null) {
        try {
          dl.getConnection().disconnect();
        }
 catch (        Exception e) {
        }
      }
    }
 catch (    PluginException e) {
      e.fillLinkStatus(downloadLink.getLinkStatus());
    }
synchronized (accounts) {
      if (disabled.size() > 0) {
        int randId=(int)(Math.random() * disabled.size());
        disabled.get(randId).setTempDisabled(false);
        getPluginConfig().save();
      }
    }
  }
  return;
}