Beta
Callback that will retrieve and complete a ThreeLeggedFlow when redirected to by a token
server or service provider. Developer should subclass to provide the necessary information
tailored to their specific use case.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[],[],null,["# Class AbstractCallbackServlet (1.39.0)\n\nVersion latestkeyboard_arrow_down\n\n- [1.39.0 (latest)](/java/docs/reference/google-oauth-client/latest/com.google.api.client.extensions.servlet.auth.AbstractCallbackServlet)\n- [1.38.2](/java/docs/reference/google-oauth-client/1.38.2/com.google.api.client.extensions.servlet.auth.AbstractCallbackServlet)\n- [1.37.0](/java/docs/reference/google-oauth-client/1.37.0/com.google.api.client.extensions.servlet.auth.AbstractCallbackServlet)\n- [1.36.0](/java/docs/reference/google-oauth-client/1.36.0/com.google.api.client.extensions.servlet.auth.AbstractCallbackServlet)\n- [1.34.1](/java/docs/reference/google-oauth-client/1.34.1/com.google.api.client.extensions.servlet.auth.AbstractCallbackServlet)\n- [1.33.3](/java/docs/reference/google-oauth-client/1.33.3/com.google.api.client.extensions.servlet.auth.AbstractCallbackServlet)\n- [1.32.1](/java/docs/reference/google-oauth-client/1.32.1/com.google.api.client.extensions.servlet.auth.AbstractCallbackServlet) \n\n public abstract class AbstractCallbackServlet extends HttpServlet\n\n**Deprecated.** *Use [com.google.api.client.extensions.servlet.auth.oauth2.AbstractAuthorizationCodeCallbackServlet](/java/docs/reference/google-oauth-client/latest/com.google.api.client.extensions.servlet.auth.oauth2.AbstractAuthorizationCodeCallbackServlet).*\n\nBeta \n\nCallback that will retrieve and complete a ThreeLeggedFlow when redirected to by a token\nserver or service provider. Developer should subclass to provide the necessary information\ntailored to their specific use case.\n\nWarning: starting with version 1.7, usage of this for OAuth 2.0 is deprecated. Instead use\n[com.google.api.client.extensions.servlet.auth.oauth2.AbstractAuthorizationCodeCallbackServlet](/java/docs/reference/google-oauth-client/latest/com.google.api.client.extensions.servlet.auth.oauth2.AbstractAuthorizationCodeCallbackServlet). \n\nInheritance\n-----------\n\n[java.lang.Object](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html) \\\u003e javax.servlet.GenericServlet \\\u003e [HttpServlet](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html) \\\u003e AbstractCallbackServlet \n\nInherited Members\n-----------------\n\n[Object.clone()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--) \n[Object.equals(Object)](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#equals-java.lang.Object-) \n[Object.finalize()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#finalize--) \n[Object.getClass()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--) \n[Object.hashCode()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--) \n[Object.notify()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--) \n[Object.notifyAll()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--) \n[Object.toString()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--) \n[Object.wait()](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--) \n[Object.wait(long)](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-) \n[Object.wait(long,int)](https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-) \n[GenericServlet.destroy()](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#destroy--) \n[GenericServlet.getInitParameter(String)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#getInitParameter-java.lang.String-) \n[GenericServlet.getInitParameterNames()](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#getInitParameterNames--) \n[GenericServlet.getServletConfig()](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#getServletConfig--) \n[GenericServlet.getServletContext()](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#getServletContext--) \n[GenericServlet.getServletInfo()](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#getServletInfo--) \n[GenericServlet.getServletName()](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#getServletName--) \n[GenericServlet.init()](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#init--) \n[GenericServlet.init(ServletConfig)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#init-javax.servlet.ServletConfig-) \n[GenericServlet.log(String)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#log-java.lang.String-) \n[GenericServlet.log(String,Throwable)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/GenericServlet.html#log-java.lang.String-java.lang.Throwable-) \n[HttpServlet.doDelete(HttpServletRequest,HttpServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#doDelete-javax.servlet.http.HttpServletRequest-javax.servlet.http.HttpServletResponse-) \n[HttpServlet.doGet(HttpServletRequest,HttpServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#doGet-javax.servlet.http.HttpServletRequest-javax.servlet.http.HttpServletResponse-) \n[HttpServlet.doHead(HttpServletRequest,HttpServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#doHead-javax.servlet.http.HttpServletRequest-javax.servlet.http.HttpServletResponse-) \n[HttpServlet.doOptions(HttpServletRequest,HttpServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#doOptions-javax.servlet.http.HttpServletRequest-javax.servlet.http.HttpServletResponse-) \n[HttpServlet.doPost(HttpServletRequest,HttpServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#doPost-javax.servlet.http.HttpServletRequest-javax.servlet.http.HttpServletResponse-) \n[HttpServlet.doPut(HttpServletRequest,HttpServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#doPut-javax.servlet.http.HttpServletRequest-javax.servlet.http.HttpServletResponse-) \n[HttpServlet.doTrace(HttpServletRequest,HttpServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#doTrace-javax.servlet.http.HttpServletRequest-javax.servlet.http.HttpServletResponse-) \n[HttpServlet.getLastModified(HttpServletRequest)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#getLastModified-javax.servlet.http.HttpServletRequest-) \n[HttpServlet.service(ServletRequest,ServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#service-javax.servlet.ServletRequest-javax.servlet.ServletResponse-) \n[HttpServlet.service(HttpServletRequest,HttpServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#service-javax.servlet.http.HttpServletRequest-javax.servlet.http.HttpServletResponse-)\n\nConstructors\n------------\n\n### AbstractCallbackServlet() (deprecated)\n\n public AbstractCallbackServlet()\n\nConstructor with will ask the concrete subclass for all required information on the\nenvironment.\n\nMethods\n-------\n\n### doGet(HttpServletRequest req, HttpServletResponse resp) (deprecated)\n\n protected final void doGet(HttpServletRequest req, HttpServletResponse resp)\n\n**Overrides** \n[HttpServlet.doGet(HttpServletRequest,HttpServletResponse)](https://docs.oracle.com/javase/8/docs/api/javax/servlet/http/HttpServlet.html#doGet-javax.servlet.http.HttpServletRequest-javax.servlet.http.HttpServletResponse-)\n\n### getCompletionCodeQueryParam() (deprecated)\n\n protected abstract String getCompletionCodeQueryParam()\n\n### getConcreteFlowType() (deprecated)\n\n protected abstract Class\u003c? extends ThreeLeggedFlow\u003e getConcreteFlowType()\n\n### getDeniedRedirectUrl() (deprecated)\n\n protected abstract String getDeniedRedirectUrl()\n\n### getHttpTransport() (deprecated)\n\n protected final HttpTransport getHttpTransport()\n\nReturn the HttpTransport instance for this servlet.\n\n### getJsonFactory() (deprecated)\n\n protected final JsonFactory getJsonFactory()\n\nReturn the JsonFactory instance for this servlet.\n\n### getPersistenceManagerFactory() (deprecated)\n\n protected abstract PersistenceManagerFactory getPersistenceManagerFactory()\n\nOverride with your chosen method to get a PersistenceManagerFactory. For app engine\napplications this should be a singleton.\n\n### getSuccessRedirectUrl() (deprecated)\n\n protected abstract String getSuccessRedirectUrl()\n\n### getUserId() (deprecated)\n\n protected abstract String getUserId()\n\n### newHttpTransportInstance() (deprecated)\n\n protected abstract HttpTransport newHttpTransportInstance()\n\nCreate a new HttpTransport instance. Implementations can create any type of applicable\ntransport and should be as simple as:\n\nnew NetHttpTransport();\n\n### newJsonFactoryInstance() (deprecated)\n\n protected abstract JsonFactory newJsonFactoryInstance()\n\nCreate a new JsonFactory instance. Implementations can create any type of applicable\njson factory and should be as simple as:\n\nnew GsonFactory();"]]
