支持
While we do not support the entirety of the Java EE
specification, many of its individual components are supported. These
include:
- Java Data Objects (JDO) -- notes
- Java Persistence API (JPA) -- notes
*
- Java Server Faces (JSF) 1.1 - 2.0
**
- Java Server Pages (JSP) + JSTL ***
- Java Servlet API 2.4 -- notes
- JavaBeans™ Activation Framework (JAF)
- JavaMail -- notes
- XML processing APIs including DOM, SAX, and XSLT
*
For a guide on "converting" between JPA and JDO, see the blog entry at http://objectuser.wordpress.com/2009/07/04/17-minute-jdo/
.
**
JSF 1.1 appears to be working out-of-the-box. JSF 1.2 and JSF 2.0
should also work if you set the
com.sun.faces.enableMultiThreadedStartup context parameter to false to
your web.xml file. Setting this parameter to false (it's set to true by
default) will prevent additional threads from being spawned. For more
information on running JSF 2.0 in App Engine, see this Site
.
***
JSP session beans are not supported.
不支持
There are various APIs and technologies that are not supported by App Engine at present for various reasons. These include:
- Enterprise Java Beans (EJB)
- JAX-RPC
- JAX-WS
- JAXB
- Java Database Connectivity (JDBC) **
- Java EE™ Connector Architecture (JCA)
- Java Management Extensions (JMX)
- Java Message Service (JMS)
- Java Naming and Directory Interface (JNDI)
- Remote Method Invocation (RMI)
**
App Engine's underlying datastore is based on BigTable, not a
traditional SQL-based RDBMS like MySQL or PostgreSQL. You may either
use the low-level datastore API or the JDO or JPA
object-relational mapping interfaces provided. Various JDBC wrappers
are available for the datastore, and you may still be able to connect
to in-memory databases such as the H2 database engine or HSQLDB.
JVM-based Languages
NOTE: All JVM-based languages are subject to the same App Engine sandbox restrictions
as Java.
BeanShell
Version(s): ?
Status: COMPATIBLE
CAL
Version(s): ?
Status: COMPATIBLE
Groovy
Versions: 1.6.1 +
Status: COMPATIBLE
JRuby (Ruby)
Versions: 1.3.1+
Status: COMPATIBLE
(see notes)
Jython (Python)
Versions: 2.2, 2.5rc4 +
Status: COMPATIBLE
Quercus (PHP)
Version(s): ?
Status: COMPATIBLE
Rhino (JavaScript)
Version(s): ?
Status: COMPATIBLE
Scala
Version(s): ?
Status: COMPATIBLE
- Scala works out-of-the-box as does the Lift Web Framework for Scala.
- Scala Actors do not work, because they are implemented using threads, which are not supported.
- Dave Briccetti has posted his experience running Scala with App Engine to his blog
.
Miscellaneous Java™ Libraries and Frameworks
Apache Commons FileUpload
Version: 1.2.1
Status: SEMI-COMPATIBLE
- The streaming API added in version 1.2.1 works out of the box.
- The
traditional API is not supported due to dependencies on java.io.File
(App Engine does not expose a writable file system), although a custom
FileItemFactory implementation that does not rely on writing files
should work.
Apache POI
Version(s): ?
Status: INCOMPATIBLE
BlazeDS
Version: 3.2.0.3978
Status: COMPATIBLE
Compass
Version(s): ?
Status: SEMI-COMPATIBLE
Direct Web Remoting (DWR)
Version(s): 2.0.5, 3.0 RC1
Status: COMPATIBLE
dyuproject
(OpenID RelyingParty 2.0 implementation, OAuth consumer and service
provider, JSON IOC, lightweight Servlet-based REST framework)
Version(s): ?
Status: COMPATIBLE
Ehcache
Version: 1.6.0
Status: COMPATIBLE
Facelets
Version: 1.1.14
Status: COMPATIBLE
Google Data (GData) client library for Java
Version(s): all
Status: COMPATIBLE
- As per this FAQ
, you need set a specific configuration error to avoid a runtime permissions error. Otherwise, you will see java.security.AccessControlException: access denied (java.net.NetPermission getCookieHandler)
when you try to use the library.
Google Web Toolkit (GWT)
Versions: All
Status: COMPATIBLE
Grails
Version: 1.1.1
Status: SEMI-COMPATIBLE
- A
plugin has been made available which integrates the App Engine SDK with
Grails, adding features to upload Grails application automatically and
run the local dev server. To download this plugin or see a screencast
and tutorial, see http://grails.org/plugin/app-engine
.
- As of now, you have to use the "grails
app-engine run" command rather than "grails run-app", which blocks
other plugins that extend run-app including the GWT plugin. More
incompatibilities noted in this thread
.
GraniteDS
Version(s): ?
Status: COMPATIBLE
Guice
Version(s): ?
Status: SEMI-COMPATIBLE
Notes:
Hibernate
Versions: All
Status: INCOMPATIBLE
- You
cannot currently use Hibernate directly. The differences between the
App Engine datastore and SQL were too great to get the standard
Hibernate up and running under App Engine. App Engine does support JDO
and JPA, so you may be able to convert your Hibernate code to use one
of these ORM interfaces.
ICEfaces
Version(s): ?
Status: UNKNOWN
iText
Version(s): ?
Status: INCOMPATIBLE
Java Topology Suite (JTS)
Version(s): 1.10
Status: COMPATIBLE
JBoss Seam
Version(s): ?
Status: SEMI-COMPATIBLE
Jersey
Version: 1.0.2
Status: SEMI-COMPATIBLE
- Jersey
does not run in App Engine's production environment out-of-the-box, but
you can make some modifications to get basic uses working. Several of
these are documented at http://lqd.hybird.org/journal/?p=123
.
log4j
Version(s): ?
Status: COMPATIBLE
MyFaces
Version: 1.1.6
Status: COMPATIBLE
OpenSocial client library for Java
Version(s): 20090402
Status: COMPATIBLE
OSGi
Version(s): ?
Status: SEMI-COMPATIBLE
Restlet
Version(s): ?
Status: COMPATIBLE
- The team has created an adaptation of Restlet
just for App Engine.
- See
http://wiki.restlet.org/developers/172-restlet/251-restlet.html for
instructions on tuning a standard installation of Restlet for App
Engine.
RichFaces
Version: 3.1.6
Status: INCOMPATIBLE
- RichFaces depends on the javax.imageio package which is presently not listed on the JRE class whitelist
.
SiteMesh
Versions: 2.4.2 +
Status: COMPATIBLE
Spring MVC
Version: 2.5.6
Status: COMPATIBLE
Spring ORM
Version: 2.5.6
Status: COMPATIBLE
Spring Security
Version(s): ?
Status: SEMI-COMPATIBLE
Stripes Framework
Version(s): ?
Status: COMPATIBLE
Struts 1
Version: 1.2.28
Status: COMPATIBLE
Struts 2
Version(s): ?
Status: COMPATIBLE
(see notes)
Tapestry
Version: 5.0.18
Status: COMPATIBLE
Version: 5.1
Status: INCOMPATIBLE
- Version
5.1 appears to rely on the Woodstox XML processor, which in turn relies
on javax.xml.stream.XMLInputFactory, which isn't on the current JRE class white list
. No workarounds are known at this time.
Tiles
Version: 2.0.7
Status: COMPATIBLE
- Older versions may not work.
Vaadin
Version(s): ?
Status: SEMI-COMPATIBLE
VRaptor 2
Version(s): ?
Status: COMPATIBLE
- Requires App Engine sessions to be enabled
.
WebORB
Version(s): ?
Status: COMPATIBLE
Wicket
Version(s): ?
Status: SEMI-COMPATIBLE
ZK
Version(s): 3.6.2 +
Status:
COMPATIBLE
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