[Building Sakai] Using spring-mvc and free marker templates in a sakai tool
Jim Eng
jimeng at umich.edu
Mon Jul 22 11:37:00 PDT 2013
BTW, freemarker.cache.TemplateLoader (the missing class) is an interface defined in the freemarker jar. As I understand it, the freemarker jar provides various implementations, but it's possible that the actual implementation is determined by classes in the spring-context-support jar, which is in shared.
Jim
On Jul 22, 2013, at 2:17 PM, Jim Eng <jimeng at umich.edu> wrote:
> I'm having a problem. I hope someone has a suggestion. I am trying to write a sakai tool that will use freemarker templates to render views. I have defined web.xml to use the sakai ToolListener and ContextListener to get requests within the site. I am using sakai's RequestFilter to supply various context variables. With that servlet defined by web.xml, I am trying to use freemarker's view resolver to find templates. That all looks good to me, but when I deploy the tool into sakai, if fails with an error message saying a critical freemarker class cannot be found.
>
> I think the problem is with the class loader. Some of the required spring support is in shared, and (of course) my app is in web apps.
>
> I will show web.xml [1], the servlet file [2] and the error message from catalina.out when I try to load the first page [3]. I'll also show what's in the webapp war's /WEB-INF/lib/ folder [4].
>
> I'd be glad to post other info or send it privately to avoid spamming this list.
>
> Suggestions appreciated.
>
> Jim
>
>
> [1] web.xml:
>
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <web-app xmlns="http://java.sun.com/xml/ns/j2ee"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
> version="2.4">
>
> <display-name>Files</display-name>
>
> <!-- Sakai Request Filter -->
> <filter>
> <filter-name>sakai.request</filter-name>
> <filter-class>org.sakaiproject.util.RequestFilter</filter-class>
> <!-- If you need to do uploads you will need this
> <init-param>
> <param-name>upload.enabled</param-name>
> <param-value>true</param-value>
> </init-param>
> -->
> </filter>
>
> <filter-mapping>
> <filter-name>sakai.request</filter-name>
> <servlet-name>repo-tool</servlet-name>
> <dispatcher>REQUEST</dispatcher>
> <dispatcher>FORWARD</dispatcher>
> <dispatcher>INCLUDE</dispatcher>
> </filter-mapping>
>
> <!-- This application's servlet class -->
> <servlet>
> <servlet-name>repo-tool</servlet-name>
> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
> <init-param>
> <param-name>main-page</param-name>
> <param-value>/index.html</param-value>
> </init-param>
> <load-on-startup>1</load-on-startup>
> </servlet>
>
> <!-- Sakai Tool Listener -->
> <listener>
> <listener-class>org.sakaiproject.util.ToolListener</listener-class>
> </listener>
>
> <!-- Sakai Spring Listener -->
> <listener>
> <listener-class>org.sakaiproject.util.ContextLoaderListener</listener-class>
> </listener>
>
> </web-app>
>
> [2] repo-tool-servlet.xml:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <beans xmlns="http://www.springframework.org/schema/beans"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xmlns:p="http://www.springframework.org/schema/p"
> xmlns:context="http://www.springframework.org/schema/context"
> xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
>
> <bean id="templateLoader" class="org.sakaiproject.repo.ftl.RepoTemplateLoader">
> </bean>
>
> <!-- freemarker config -->
> <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
> <property name="templateLoaderPath" value="/WEB-INF/ftl"/>
> </bean>
>
> <!--
> View resolvers can also be configured with ResourceBundles or XML files. If you need
> different view resolving based on Locale, you have to use the resource bundle resolver.
> -->
> <bean id="viewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
> <property name="cache" value="true"/>
> <property name="prefix" value=""/>
> <property name="suffix" value=".ftl"/>
> </bean>
>
>
> <context:component-scan
> base-package="org.sakaiproject.repo.tool" />
>
> </beans>
>
> [3] Beginning of stack trace when trying to get to first page in the app:
>
> org.sakaiproject.portal.api.PortalHandlerException: org.sakaiproject.tool.api.ToolException: javax.servlet.ServletException: Servlet.init() for servlet repo-tool threw exception
> at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:900)
> caused by: org.sakaiproject.tool.api.ToolException: javax.servlet.ServletException: Servlet.init() for servlet repo-tool threw exception
> at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1494)
> caused by: javax.servlet.ServletException: Servlet.init() for servlet repo-tool threw exception
> at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1147)
> caused by: java.lang.NoClassDefFoundError: freemarker/cache/TemplateLoader
> at java.lang.Class.privateGetDeclaredConstructors(Class.java:2437)
> caused by: java.lang.ClassNotFoundException: freemarker.cache.TemplateLoader
> at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> at java.lang.Class.getDeclaredConstructors0(Native Method)
> at java.lang.Class.privateGetDeclaredConstructors(Class.java:2437)
> at java.lang.Class.getDeclaredConstructors(Class.java:1863)
> at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:230)
> at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:972)
> at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:945)
> at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
> at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
> at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
> at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
> at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
> at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
> at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:626)
> at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
> at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
> at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651)
> at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:599)
> at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665)
> at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:518)
> at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:459)
> at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
> at javax.servlet.GenericServlet.init(GenericServlet.java:160)
> at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1228)
> at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1147)
> at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:836)
> at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:657)
>
>
> [4] jars in /WEB-INF/lib:
>
> $ ls -la ../webapps/repo/WEB-INF/lib/
> total 4968
> drwxr-xr-x 10 jimeng staff 340 Jul 22 14:03 .
> drwxr-xr-x 9 jimeng staff 306 Jul 22 14:03 ..
> -rw-r--r-- 1 jimeng staff 73098 May 23 2012 commons-codec-1.5.jar
> -rw-r--r-- 1 jimeng staff 931168 Jun 25 19:23 freemarker-2.3.19.jar
> -rw-r--r-- 1 jimeng staff 20682 May 23 2012 jstl-1.1.2.jar
> -rw-r--r-- 1 jimeng staff 367444 May 23 2012 log4j-1.2.14.jar
> -rw-r--r-- 1 jimeng staff 8391 Jun 25 19:20 sakai-jsp-adapter-0.10-K1.jar
> -rw-r--r-- 1 jimeng staff 93500 Jul 19 13:58 sakai-kernel-util-1.4.0-20130718.171752-155.jar
> -rw-r--r-- 1 jimeng staff 636659 Jul 5 12:33 spring-webmvc-3.2.3.RELEASE.jar
> -rw-r--r-- 1 jimeng staff 393259 May 23 2012 standard-1.1.2.jar
> $
>
>
>
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