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!

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:

Actually... seems like componentDescriptor.addComponentDependency() doesn't add the dependency either :-( Just ends up being null when retrieving it. Is there something that needs to be done before injection happens on these objects?

On Fri, Dec 4, 2009 at 12:34 AM, Lewis Denizen <orangerd(a)gmail.com> wrote: > 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