One of the issues that you are going to encounter is the mismatch between the JSP API defined in GAE and the implementation of that API provided. As documented in bug 1506<http://code.google.com/p/googleappengine/issues/detail?id=1506>, GAE includes the JSP 2.1 specification (found in the geronimo-jsp_2.1_spec-1.0.1.jar); however, they provide the Apache Tomcat Jasper classes from 5.0.28 which implements the 2.0 JSP specification.
If you want to use the 2.1 Unified Expression language, then you're going to need to download the Unified Expression Language <https://uel.dev.java.net/> 1.1 API (el-api-1.1.jar<http://download.java.net/maven/glassfish/javax/el/el-api/1.1/el-api-1.1.jar>) and Implementation (el-impl-1.1jar<http://download.java.net/maven/glassfish/org/glassfish/web/el-impl/1.1/el-impl-1.1.jar>) files and place them in the WEB-INF/lib directory of your web application. Once that is done, modify your web.xml with the following snippet of code: <!-- GAE Bug 1506 JSP 2.1 API but 2.0 Implementation --> <context-param> <param-name>com.sun.faces.expressionFactory</param-name> <param-value>com.sun.el.ExpressionFactoryImpl</param-value> </context-param> This should make the Unified EL available to your web application. Derek Berube Wildstar Technologies, LLC. 1453 Riverview Run Lane Suwanee, Georgia 30024-3890 M: (404) 444-5283 http://www.wildstartech.com/ On Wed, Nov 18, 2009 at 5:24 AM, Nacho Coloma <[email protected]> wrote: > Hi all, > > I have been trying to use the following web.xml elements in GAE: > > <jsp-config> > <jsp-property-group> > <url-pattern>*.jsp</url-pattern> > <el-ignored>false</el-ignored> > > <include-prelude>/WEB-INF/taglibs.jspf</include-prelude> > > <deferred-syntax-allowed-as-literal>true</deferred-syntax-allowed- > as-literal> > > <trim-directive-whitespaces>true</trim-directive-whitespaces> > </jsp-property-group> > </jsp-config> > > This instructs the JSP compiler to add some directives at the > beginning of all JSP pages: > > * el-ignored: to be able to use ${...} at every page. > * include-prelude: to include a jsp fragment with tag libraries etc at > the beginning. > * deferred-syntax-allowed-as-literal: to ignore the use of #{...} > literals > * trim-directive-whitespaces: to trim the line feeds at the beginning > of each page > > The thing is, this is only supported for web.xml 2.5 which I know is > supported by jetty but not by AppEngine. Anyway, I would expect it to > throw an exception instead of ignoring my XML start: > > <?xml version="1.0" encoding="UTF-8"?> > <web-app xmlns="http://java.sun.com/xml/ns/javaee"; > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > xsi:schemaLocation="http://java.sun.com/xml/ns/javaee > http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"; > metadata-complete="true" version="2.5"> > > The thing is, I don't know if: > > * It is planned to be supported by AppEngine at some point. > * I am missing the correct way of configuring this in GAE. > * Just nobody looked at it before. > > Comments would be welcome. Best regards, > > Nacho. > > -- > > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=. > > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=.
