Program: 28457
Project: 28457
Buggy source:
public void add(WebComponentDescriptor other,boolean combineUrlPatterns){
  if (!getCanonicalName().equals(other.getCanonicalName())) {
    return;
  }
  if ((isServlet() && !other.isServlet()) || (!isServlet() && other.isServlet())) {
    return;
  }
  if (combineUrlPatterns || getUrlPatternsSet().size() == 0) {
    getUrlPatternsSet().addAll(other.getUrlPatternsSet());
  }
  for (Iterator<InitializationParameter> initParamIter=other.getInitializationParameterSet().iterator(); initParamIter.hasNext(); ) {
    InitializationParameter initParam=initParamIter.next();
    if (getInitializationParameterByName(initParam.getName()) == null) {
      getInitializationParameterSet().add(initParam);
    }
  }
  for (Iterator<SecurityRoleReference> secRoleRefIter=other.getSecurityRoleReferenceSet().iterator(); secRoleRefIter.hasNext(); ) {
    SecurityRoleReference secRoleRef=secRoleRefIter.next();
    if (getSecurityRoleReferenceByName(secRoleRef.getRoleName()) == null) {
      getSecurityRoleReferenceSet().add(secRoleRef);
    }
  }
  if (getLoadOnStartUp() == null) {
    setLoadOnStartUp(other.getLoadOnStartUp());
  }
  if (isAsyncSupported() == null) {
    setAsyncSupported(other.isAsyncSupported());
  }
  if (getRunAsIdentity() == null) {
    setRunAsIdentity(other.getRunAsIdentity());
  }
  if (getMultipartConfig() == null) {
    setMultipartConfig(other.getMultipartConfig());
  }
  if (getWebComponentImplementation() == null) {
    setWebComponentImplementation(other.getWebComponentImplementation());
  }
}

Fixed version (ground truth):
public void add(WebComponentDescriptor other,boolean combineUrlPatterns,boolean combineConflict){
  if (!getCanonicalName().equals(other.getCanonicalName())) {
    return;
  }
  if ((isServlet() && !other.isServlet()) || (!isServlet() && other.isServlet())) {
    return;
  }
  if (combineUrlPatterns || getUrlPatternsSet().size() == 0) {
    getUrlPatternsSet().addAll(other.getUrlPatternsSet());
  }
  if (conflictedInitParameterNames == null) {
    conflictedInitParameterNames=other.getConflictedInitParameterNames();
  }
 else {
    conflictedInitParameterNames.addAll(other.getConflictedInitParameterNames());
  }
  if (!combineConflict) {
    for (Iterator<InitializationParameter> initParamIter=getInitializationParameterSet().iterator(); initParamIter.hasNext(); ) {
      InitializationParameter initParam=initParamIter.next();
      conflictedInitParameterNames.remove(initParam.getName());
    }
  }
  for (Iterator<InitializationParameter> initParamIter=other.getInitializationParameterSet().iterator(); initParamIter.hasNext(); ) {
    InitializationParameter initParam=initParamIter.next();
    InitializationParameter origInitParam=getInitializationParameterByName(initParam.getName());
    if (origInitParam == null) {
      getInitializationParameterSet().add(initParam);
    }
 else     if (combineConflict && !origInitParam.getValue().equals(initParam.getValue())) {
      getConflictedInitParameterNames().add(initParam.getName());
    }
  }
  for (Iterator<SecurityRoleReference> secRoleRefIter=other.getSecurityRoleReferenceSet().iterator(); secRoleRefIter.hasNext(); ) {
    SecurityRoleReference secRoleRef=secRoleRefIter.next();
    if (getSecurityRoleReferenceByName(secRoleRef.getRoleName()) == null) {
      getSecurityRoleReferenceSet().add(secRoleRef);
    }
  }
  if (getLoadOnStartUp() == null) {
    setLoadOnStartUp(other.getLoadOnStartUp());
  }
  if (isAsyncSupported() == null) {
    setAsyncSupported(other.isAsyncSupported());
  }
  if (getRunAsIdentity() == null) {
    setRunAsIdentity(other.getRunAsIdentity());
  }
  if (getMultipartConfig() == null) {
    setMultipartConfig(other.getMultipartConfig());
  }
  if (getWebComponentImplementation() == null) {
    setWebComponentImplementation(other.getWebComponentImplementation());
  }
}