Program: 28186
Project: 28186
Buggy source:
private Config buildConfiguration(){
  Config config=new Config();
  String hazelcastFilePath="String_Node_Str";
  URL serverConfigURL;
  try {
    if (overrideConfiguration != null && overrideConfiguration.getAlternateConfigFile() != null && overrideConfiguration.getAlternateConfigFile().exists()) {
      config=ConfigLoader.load(overrideConfiguration.getAlternateConfigFile().getAbsolutePath());
      return config;
    }
    serverConfigURL=new URL(context.getServerConfigURL());
    File serverConfigFile=new File(serverConfigURL.getPath());
    hazelcastFilePath=serverConfigFile.getParentFile().getAbsolutePath() + File.separator + configuration.getHazelcastConfigurationFile();
    File file=new File(hazelcastFilePath);
    if (file.exists()) {
      config=ConfigLoader.load(hazelcastFilePath);
      if (config == null) {
        Logger.getLogger(HazelcastCore.class.getName()).log(Level.WARNING,"String_Node_Str",hazelcastFilePath);
        config=new Config();
      }
    }
 else {
      String instanceName=context.getDefaultDomainName() + "String_Node_Str" + context.getInstanceName();
      config.setInstanceName(instanceName);
      MulticastConfig mcConfig=config.getNetworkConfig().getJoin().getMulticastConfig();
      config.getNetworkConfig().setPortAutoIncrement(true);
      mcConfig.setEnabled(true);
      if (overrideConfiguration != null) {
        mcConfig.setMulticastGroup(overrideConfiguration.getMulticastGroup());
        mcConfig.setMulticastPort(overrideConfiguration.getMulticastPort());
        config.getNetworkConfig().setPort(overrideConfiguration.getStartPort());
        if (overrideConfiguration.getMemberName() != null) {
          config.setInstanceName(overrideConfiguration.getMemberName());
        }
      }
 else {
        mcConfig.setMulticastGroup(configuration.getMulticastGroup());
        mcConfig.setMulticastPort(Integer.getInteger(configuration.getMulticastPort()));
        config.getNetworkConfig().setPort(Integer.getInteger(configuration.getStartPort()));
        config.setInstanceName(configuration.getMemberName());
      }
      config.setProperty("String_Node_Str","String_Node_Str");
    }
  }
 catch (  MalformedURLException ex) {
    Logger.getLogger(HazelcastCore.class.getName()).log(Level.WARNING,"String_Node_Str",ex);
  }
catch (  IOException ex) {
    Logger.getLogger(HazelcastCore.class.getName()).log(Level.WARNING,"String_Node_Str" + hazelcastFilePath + "String_Node_Str",ex);
  }
  return config;
}

Fixed version (ground truth):
private Config buildConfiguration(){
  Config config=new Config();
  String hazelcastFilePath="String_Node_Str";
  URL serverConfigURL;
  try {
    if (overrideConfiguration != null && overrideConfiguration.getAlternateConfigFile() != null && overrideConfiguration.getAlternateConfigFile().exists()) {
      config=ConfigLoader.load(overrideConfiguration.getAlternateConfigFile().getAbsolutePath());
      return config;
    }
    serverConfigURL=new URL(context.getServerConfigURL());
    File serverConfigFile=new File(serverConfigURL.getPath());
    hazelcastFilePath=serverConfigFile.getParentFile().getAbsolutePath() + File.separator + configuration.getHazelcastConfigurationFile();
    File file=new File(hazelcastFilePath);
    if (file.exists()) {
      config=ConfigLoader.load(hazelcastFilePath);
      if (config == null) {
        Logger.getLogger(HazelcastCore.class.getName()).log(Level.WARNING,"String_Node_Str",hazelcastFilePath);
        config=new Config();
      }
    }
 else {
      String instanceName=context.getDefaultDomainName() + "String_Node_Str" + context.getInstanceName();
      config.setInstanceName(instanceName);
      MulticastConfig mcConfig=config.getNetworkConfig().getJoin().getMulticastConfig();
      config.getNetworkConfig().setPortAutoIncrement(true);
      mcConfig.setEnabled(true);
      if (overrideConfiguration != null) {
        mcConfig.setMulticastGroup(overrideConfiguration.getMulticastGroup());
        mcConfig.setMulticastPort(overrideConfiguration.getMulticastPort());
        config.getNetworkConfig().setPort(overrideConfiguration.getStartPort());
        if (overrideConfiguration.getMemberName() != null) {
          config.setInstanceName(overrideConfiguration.getMemberName());
        }
      }
 else {
        mcConfig.setMulticastGroup(configuration.getMulticastGroup());
        mcConfig.setMulticastPort(Integer.valueOf(configuration.getMulticastPort()));
        config.getNetworkConfig().setPort(Integer.valueOf(configuration.getStartPort()));
        config.setInstanceName(configuration.getMemberName());
      }
      config.setProperty("String_Node_Str","String_Node_Str");
    }
  }
 catch (  MalformedURLException ex) {
    Logger.getLogger(HazelcastCore.class.getName()).log(Level.WARNING,"String_Node_Str",ex);
  }
catch (  IOException ex) {
    Logger.getLogger(HazelcastCore.class.getName()).log(Level.WARNING,"String_Node_Str" + hazelcastFilePath + "String_Node_Str",ex);
  }
  return config;
}