boolean (PsiClass aClass) { final Project project = aClass.getProject(); final PsiManager manager = aClass.getManager(); final GlobalSearchScope scope = GlobalSearchScope.allScope(project); final PsiClass serializable = JavaPsiFacade.getInstance(manager.getProject()).findClass("java.io.Serializable", scope); if (!InheritanceUtil.isInheritorOrSelf(aClass, serializable, true)) { return false; } final PsiMethod[] methods = aClass.findMethodsByName("writeObject", false); for (PsiMethod method : methods) { final PsiParameterList parameterList = method.getParameterList(); final PsiParameter[] parameters = parameterList.getParameters(); if (parameters.length == 1) { final PsiType type = parameters[0].getType(); final String text = type.getCanonicalText(); if ("java.io.DataOutputStream".equals(text)) { return false; } } } return true; }