Re: [xwiki-users] Components from the wiki

Thanks Vincent! That's exactly what I needed :-) Just one more question, though.. Is it possible to inject dependencies by using the attributes defined within the class then? Right now, using the DefaultComponentDescriptor, I can inject dependencies using: componentDescriptor.addComponentDependency(QueryManager.class, "default") but would be nice if it could auto-inject into something like: class UserXWQLDAO implements UserDAO { @Requirement def QueryManager queryManager //... }

Thanks again for a great wiki! On Wed, Dec 2, 2009 at 3:56 AM, Vincent Massol <vincent(a)massol.net> wrote: > Hi Lewis, > > On Dec 1, 2009, at 7:12 PM, Lewis Denizen wrote: > >> Hi xwiki-users, >> >> I'm trying to bootstrap a component from the wiki itself (via >> Groovy). I >> have an interface defined as follows: >> >> // This is the text inside the User.UserDAO document >> {{groovy}} >> interface UserDAO >> { >> def ROLE = UserDAO.class.name >> >> /** >> * Returns the current user name. >> */ >> def getUserName() >> >> /** >> * Returns the current user's password >> */ >> def getPassword() >> } >> {{/groovy}} >> >> I also have a dummy implementation defined as follows: >> >> // This is the text inside the User.UserXWQLDAO document >> {{include document="User.UserDAO" /}} >> {{groovy}} >> import org.xwiki.component.annotation.Component >> import org.xwiki.component.annotation.Requirement >> import org.xwiki.component.descriptor.DefaultComponentDescriptor >> import org.xwiki.query.Query >> import org.xwiki.query.QueryManager >> >> import com.xpn.xwiki.web.Utils >> >> @Component(roles = [ UserDAO.class ]) >> class UserXWQLDAO implements UserDAO >> { >> @Requirement >> def QueryManager queryManager >> >> /** >> * Returns the current user name. >> */ >> def getUserName() { >> return "bleh" >> } >> >> /** >> * Returns the current user's password >> */ >> def getPassword() { >> return "bleh" >> } >> } >> >> if(!Utils.componentManager.hasComponent(UserDAO.class)) >> { >> def componentDescriptor = new DefaultComponentDescriptor() >> componentDescriptor.setImplementation(UserDAO.class) >> >> Utils.componentManager.registerComponent(componentDescriptor, new >> UserXWQLDAO()) >> } >> {{/groovy}} >> >> The first problem I ran into was that Groovy 1.6.5 ran into >> IncompatibleClassChangeErrors ( > http://jira.codehaus.org/browse/GROOVY-3830 >> ). >> Upgrading to 1.6.6 fixed this issue. But, then I ran into a NPE: >> >> *exception* >> >> javax.servlet.ServletException: Failed to initialize Request/ >> Response or Session >> >> com >> .xpn >> .xwiki >> .web.XWikiAction.initializeContainerComponent(XWikiAction.java: >> 391) >> >> com >> .xpn.xwiki.web.XWikiAction.initializeXWikiContext(XWikiAction.java: >> 372) >> com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:112) >> >> org >> .apache >> .struts >> .action.RequestProcessor.processActionPerform(RequestProcessor.java: >> 431) >> >> org >> .apache >> .struts.action.RequestProcessor.process(RequestProcessor.java: >> 236) >> >> org.apache.struts.action.ActionServlet.process(ActionServlet.java: >> 1196) >> > org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) >> javax.servlet.http.HttpServlet.service(Unknown Source) >> javax.servlet.http.HttpServlet.service(Unknown Source) >> >> com >> .xpn >> .xwiki >> .wysiwyg >> .server.filter.ConversionFilter.doFilter(ConversionFilter.java:152) >> com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:119) >> >> com >> .xpn >> .xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java: >> 68) >> >> com >> .xpn >> .xwiki >> .web >> .SavedRequestRestorerFilter >> .doFilter(SavedRequestRestorerFilter.java: >> 295) >> >> com >> .xpn >> .xwiki >> .web >> .SetCharacterEncodingFilter >> .doFilter(SetCharacterEncodingFilter.java: >> 112) >> >> *root cause* >> >> org.xwiki.container.servlet.ServletContainerException: Failed to >> initialize request >> >> org >> .xwiki >> .container >> .servlet >> .internal >> .DefaultServletContainerInitializer >> .initializeRequest(DefaultServletContainerInitializer.java:98) >> >> com >> .xpn >> .xwiki >> .web.XWikiAction.initializeContainerComponent(XWikiAction.java: >> 387) >> >> com >> .xpn.xwiki.web.XWikiAction.initializeXWikiContext(XWikiAction.java: >> 372) >> com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:112) >> >> org >> .apache >> .struts >> .action.RequestProcessor.processActionPerform(RequestProcessor.java: >> 431) >> >> org >> .apache >> .struts.action.RequestProcessor.process(RequestProcessor.java: >> 236) >> >> org.apache.struts.action.ActionServlet.process(ActionServlet.java: >> 1196) >> > org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) >> javax.servlet.http.HttpServlet.service(Unknown Source) >> javax.servlet.http.HttpServlet.service(Unknown Source) >> >> com >> .xpn >> .xwiki >> .wysiwyg >> .server.filter.ConversionFilter.doFilter(ConversionFilter.java:152) >> com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:119) >> >> com >> .xpn >> .xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java: >> 68) >> >> com >> .xpn >> .xwiki >> .web >> .SavedRequestRestorerFilter >> .doFilter(SavedRequestRestorerFilter.java: >> 295) >> >> com >> .xpn >> .xwiki >> .web >> .SetCharacterEncodingFilter >> .doFilter(SetCharacterEncodingFilter.java: >> 112) >> >> *root cause* >> >> java.lang.NullPointerException >> >> >> Haven't investigated any further than this, but has anyone >> successfully >> created components completely within a wiki document? That would >> just be so >> cool! Great work! > > Yes, I've done that several times. > > Here's an example: > > http://svn.xwiki.org/svnroot/xwiki/platform/xwiki-applications/trunk/ircbot… > (search for registerComponent). > > Hope it helps, > -Vincent