Tag: gae

google app engine August 7, 2012 by JackLok 0 comments

GAE : how to output log messages to a file

By default, all logging messages will output to log console. To change the logging settings, find this file – {Google App Engine SDK directory}\google\appengine\tools\dev_appserver_main.py. File : dev_appserver_main.py – Find following pattern #… import getopt import logging import os import signal import sys import tempfile import traceback logging.basicConfig( level=logging.INFO, format=’%(levelname)-8s %(asctime)s %(filename)s:%(lineno)s] %(message)s’) #… Output to […]

google app engine August 6, 2012 by mkyong 2 comments

GAE + Python hello world on Mac OS X

In this tutorial, we will show you how to create a simple GAE hello world web project, using Python, on Mac OS X, and run it via Google App Engine Launcher. Tools used : Google App Engine SDK for Python (Mac OS X) – 1.7.0 Mac OS X 10.8 Python 2.7 Note By default, Mac […]

tutorials May 19, 2012 by mkyong 22 comments

Google App Engine Tutorial

Google App Engine, a cloud computing platform for hosting web application in existing Google infrastructure, it’s easy to scale, manage and free to use up to a predefined consumed resources, and it supports Java. For additional charged, please refer to this GAE billing . In this series of tutorials, we will show you a list […]

google app engine May 17, 2012 by mkyong 13 comments

Google App Engine + JDO + Spring MVC, CRUD example

Note This tutorial is more on practice guide, please refer to this official Using JDO in datastore for detail explanation. See following code snippets to perform CRUD on GAE datastore, using Java Data Objects(JDO). Just annotate the Customer with JDO annotation and perform the CRUD via PersistenceManager. Add Customer c = new Customer(); c.setName(name); PersistenceManager […]

google app engine May 15, 2012 by mkyong 9 comments

Google App Engine + Spring MVC, CRUD example with datastore low level api

GAE datastore Refer to this official “Using datstore guide” to understand what is GAE datastore. See following code snippets to perform CRUD for Google App Engine datastore, Java, using low-level API. Add Store a customer into datastore, with “name” as the key. Key customerKey = KeyFactory.createKey("Customer", "your name"); Entity customer = new Entity("Customer", customerKey); customer.setProperty("name", […]

google app engine May 10, 2012 by mkyong 4 comments

Cron job on Google App Engine for Java

In this tutorial, we will show you how to create a scheduler task or cron job on Google App Engine, for Java. In GAE, cron job uses HTTP GET request to call an URL, the duration of the cron job running time is limited to run up to 10 minutes only, if excess, GAE kill […]

google app engine May 10, 2012 by mkyong 0 comments

Download / export Google App Engine Logs, Java App

In GAE, Java App, you can use command “appcfg request_logs” to download or export the logs from GAE to your computer, see signature below : AppCfg [options] request_logs <app-dir> <output-file> You can type “appcfg request_logs” to view all available options. 1. What is <app-dir> ? This is NOT your app_id nor any deployed web path […]

google app engine May 8, 2012 by mkyong 3 comments

Configure logging in Google App Engine

Google App Engine for Java is using java.util.logging.Logger to perform the logging. In this tutorial, we show you how to do logging in GAE environment. 1. Logging Example Example to define a logger in MovieController, and log the messages in different logging levels (info, warning and error) import java.util.logging.Logger; //… @Controller @RequestMapping("/movie") public class MovieController […]

google app engine April 30, 2012 by mkyong 30 comments

Google App Engine + Spring 3 MVC REST example

In this tutorial, we will show you how to develop and deploy a Spring 3.0 MVC REST web application in Google App Engine (GAE) environment. Tools and technologies used : Google App Engine Java SDK 1.6.3.1 Spring 3.1.1 JDK 1.6 Eclipse 3.7 + Google Plugin for Eclipse Note This example is going to reuse this […]

google app engine April 25, 2012 by mkyong 31 comments

Google App Engine + JSF 2 example

In this tutorial, we will show you how to develop and deploy a JSF 2.0 web application in Google App Engine (GAE) environment. Tools and technologies used : JDK 1.6 Eclipse 3.7 + Google Plugin for Eclipse Google App Engine Java SDK 1.6.3.1 JSF 2.1.7 Note This example is going to reuse this JSF 2.0 […]

google app engine April 24, 2012 by mkyong 3 comments

GAE + JSF : View /hello.xhtml could not be restored

Problem Deployed on GAE production environment, when navigate from one page/view to another page/view, GAE shows error message “View xxx could not be restored“? JSF 2.1.7 Google App Engine SDK 1.6.3 P.S No problem at local GAE development. Solution By default, JSF 2 is using server for session management, and it’s not supported in GAE […]

google app engine April 18, 2012 by mkyong 7 comments

Google App Engine + Struts 1 example

Long live classic Struts 1 framework, in this tutorial, we will show you how to develop a Struts 1.x web application in Google App Engine (GAE) environment. Tools and technologies used : JDK 1.6 Eclipse 3.7 + Google Plugin for Eclipse Google App Engine Java SDK 1.6.3.1 Struts 1.3.10 Note You may also interest at […]

google app engine April 17, 2012 by mkyong 13 comments

Google App Engine + Struts 2 example

In this tutorial, we will show you how to develop Struts 2 web application in Google App Engine (GAE) environment. Tools and technologies used : JDK 1.6 Eclipse 3.7 + Google Plugin for Eclipse Google App Engine Java SDK 1.6.3.1 Struts 2.3.1.2 Note Before proceed on this tutorial, make sure you read this – GAE […]

google app engine April 15, 2012 by mkyong 2 comments

GAE + JSF : Unable to instantiate ExpressionFactory ‘com.sun.el.ExpressionFactoryImpl’

Problem JSF application is able to deploy on local GAE environment, with following development environment : JSF 2.1.7 Google App Engine SDK 1.6.3 But hit error message while deployed on GAE production environment. Below is the logged error messages from GAE. com.sun.faces.config.ConfigureListener installExpressionFactory: Unable to instantiate ExpressionFactory ‘com.sun.el.ExpressionFactoryImpl’ E 2012-04-24 03:37:37.989 com.sun.faces.config.ConfigureListener contextInitialized: Critical error […]

google app engine April 14, 2012 by mkyong 8 comments

Your project must be configured to use a JDK in order to use JSPs

Problem Using Eclipse 3.7 + Google Plugin for Eclipse to develop GAE project, when created a .jsp file in “war” directory, Eclipse shows a cross error icon on top of the JSP file. In Eclipse problem view, it show “Your project must be configured to use a JDK in order to use JSPs.“. Solution To […]

google app engine April 12, 2012 by mkyong 1 comment

javax.swing.tree.TreeNode is a restricted class

Problem Developing Struts2 on Google App Engine, in following environment. Struts 2.3.1.2 freemaker 2.3.18 JDK 1.6 Eclipse 3.7 + Google Plugin for Eclipse Google App Engine Java SDK 1.6.3.1 GAE complaints that javax.swing.tree.TreeNode is a restricted class in local development, if deployed on real GAE production environment, error message is gone. Caused by: java.lang.NoClassDefFoundError: javax.swing.tree.TreeNode […]

google app engine April 10, 2012 by mkyong 1 comment

GAE + JSF : javax.naming.InitialContext is a restricted class

Problem Developing JSF (2.1.7) web application with Google App Engine (1.6.3), hits following error message : java.lang.NoClassDefFoundError: javax.naming.InitialContext is a restricted class. Please see the Google App Engine developer’s guide for more details. at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51) at com.sun.faces.config.WebConfiguration.processJndiEntries(WebConfiguration.java:687) at com.sun.faces.config.WebConfiguration.<init>(WebConfiguration.java:134) at com.sun.faces.config.WebConfiguration.getInstance(WebConfiguration.java:194) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:163) //… Solution Java clsss – javax.naming.InitialContext, is not supported in Google App […]

google app engine April 10, 2012 by mkyong 1 comment

Struts 2 on GAE – Error: result ‘null’ not found

Problem Developing Struts2 on Google App Engine, in following environment. Struts 2.3.1.2 JDK 1.6 Eclipse 3.7 + Google Plugin for Eclipse Google App Engine Java SDK 1.6.3.1 Just started a simple Struts2 hello world example, when access the action class, hit error “Error: result ‘null’ not found”, in both local development and real production GAE […]

google app engine April 9, 2012 by mkyong 9 comments

GAE + Java – Integrating Google user account

For this tutorial, we will show you how to integrate Google user account in GAE + Java project, via Google Java SDK UserService class. Tools used : JDK 1.6 Eclipse 3.7 + Google Plugin for Eclipse Google App Engine Java SDK 1.6.3.1 1. GAE User service example If user login by using their Google account, […]

google app engine April 8, 2012 by mkyong 0 comments

Download uploaded application from Google App Engine (GAE)

You can use command “appcfg download_app” to download uploaded application from GAE, see signature below : AppCfg [options] -A app_id [ -V version ] download_app <out-dir> AppCfg download example Assume you have uploaded an application with app_id “mkyong-springmvc” to GAE, to download it back on your computer, use following command : D:\appengine-java-sdk-1.6.3.1\bin>appcfg -A mkyong-springmvc download_app […]

google app engine April 3, 2012 by mkyong 44 comments

Google app engine Python hello world example using Eclipse

In this tutorial, we will show you how to use Eclipse to create a Google App Engine (GAE) Python web project (hello world example), run it locally, and deploy it to Google App Engine account. Tools used : Python 2.7 Eclipse 3.7 + PyDev plugin Google App Engine SDK for Python 1.6.4 P.S Assume Python […]

google app engine April 1, 2012 by mkyong 1 comment

Struts 2 on GAE – java.security.AccessControlException: access denied

Problem Developing Struts2 (v 2.3.1.2) on Google App Engine (SDK v1.6.3.1), local development, hit “java.security.AccessControlException: access denied” error? Solution Normally, this is because you turn the “devMode on” in struts.xml file. File : struts.xml <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.devMode" value="true" /> //… </struts> […]

google app engine March 31, 2012 by mkyong 27 comments

Google app engine Java hello world example using Eclipse

In this tutorial, we will show you how to use Eclipse to create a Google App Engine (GAE) Java project (hello world example), run it locally, and deploy it to Google App Engine account. Tools used : JDK 1.6 Eclipse 3.7 + Google Plugin for Eclipse Google App Engine Java SDK 1.6.3.1 Note GAE supports […]

google app engine March 30, 2012 by mkyong 5 comments

How to install Google Plugin for Eclipse

In this tutorials, we will show you how to install “Google Plugin for Eclipse“, in Eclipse 3.7 (Indigo). 1. Installation In Eclipse 3.7, click “Help” –> “Install New Software…“, copy and paste following URL : http://dl.google.com/eclipse/plugin/3.7 Note For other Eclipse version like 3.3, 3.4, 3.5, 3.6, please refer to this GAE Eclipse documentation. Figure : […]

google app engine March 27, 2012 by mkyong 1 comment

Google Plugin for Eclipse – jar has been tampered!

Problem While installing Google Plugin for Eclipse 3.7, via http://dl.google.com/eclipse/plugin/3.7 , it took almost half and hour and download and stopped at the end. A long list of error messages “.jar has been tampered!” are prompted in Eclipse. An error occurred while collecting items to be installed session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=). No repository […]