[appengine-java] JDO: 1-N relationships
I would like some help and advice on how to model my entities using JDO on GAE. My problem is this, I have a bunch of Users and each User may create zero or more Tracks. Users may exist without a Track but Tracks may not exist without a User who created them. Other attributes on the User and the Track may updated. I would like to be able to query the Tracks and retrieve some attributes from the User who created the Track. The attributes from the User may get updated. In SQL this would be select u.displayName, t.trackName from User u, Track t, where t.userId=u.userId I have some ideas and have tried various things but this isn't a post on why doesn't something work, more of what is the best practice to solve this problem. thanks http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Cannot to read the file under /WEB-INF/classes/
I have a config file in WEB-INF/conf and I pass the location using an
init-param (called propfile) to a servlet. Then in the servlet I use
propFile = getServletConfig().getInitParameter("propfile");
base = getServletContext().getRealPath("") + FS;
where FS is
protected static final String FS = File.separator;
works with Jetty (GAE/J Dev server), Tomcat, GAE/J.
On Jul 16, 3:00 pm, Love Yao wrote:
> I want to read the config.xml in my webRoot /WEB-INF/classes/
> config.xml.
>
> All is OK in localhost.
>
> but when deploying to GAE, it cannot find the xml：
>
> /base/data/home/apps/mainloveplay/4.35187093106408/base/data/home/
> apps/mainloveplay/4.35187093106408/WEB-INF/classes/config.xml (No
> such file or directory)
>
> the code to get path is：
>
> String rootPath =
> ConfigRepository.class.getResource("/").getPath().substring(1);
> Document document = reader.read(new File(rootPath + "config.xml"));
>
> so how can I get my config.xml
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[appengine-java] Elevations API, polyline encoding, Google App Engine
I hope someone can help me get some ideas on how to debug this problem. I have build an application that needs to use the Google Elevations webservice API to get some elevations for some lat/lon pairs. I am encoding the data using my own Java implementation of the polyline encoding algorithm. My app works nicely on Linux/Tomcat/ JDK1.6, calls out to the Elevations API and gets good results. I tested using the Dev_server (1.5.0) and received an error, invalid character at position 70 of the URL that was sent to the Elevaton API. What's different about the dev_server ? Different JDK ? different encoding ? So far I've not had a chance to strip this down to bare bones and run some small tests on both environments, I am hoping to get some ideas here on which place to start. -- 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 google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] QUOTAs, usage limits
I am building my application to use the Google Elevations Webservice API which has usage quotas which is apparantly checked by IP of the caller, 1000 requests perday. what does this mean in the GAE environment ? will the Elevations webservice always see my app with the same IP ? Will other apps in GAE also appear to have the same IP if they called the same service ? -- 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 google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Elevations API, polyline encoding, Google App Engine
I got it fixed thanks. Seems I needed to URLEncode the query params for GAE/J but not for Tomcat, no bad thing to do this anyway. Not tested it on proper GAE so far though. On Aug 16, 10:41 pm, JT wrote: > A lot of stuff works outside gaej, just fyi. So don't scratched your head > too much. > > On Aug 16, 2011 4:33 AM, "Martin Newstead" wrote:> > I hope someone can help me get some ideas on how to debug this > > problem. I have build an application that needs to use the Google > > Elevations webservice API to get some elevations for some lat/lon > > pairs. I am encoding the data using my own Java implementation of the > > polyline encoding algorithm. My app works nicely on Linux/Tomcat/ > > JDK1.6, calls out to the Elevations API and gets good results. I > > tested using the Dev_server (1.5.0) and received an error, invalid > > character at position 70 of the URL that was sent to the Elevaton API. > > What's different about the dev_server ? Different JDK ? different > > encoding ? So far I've not had a chance to strip this down to bare > > bones and run some small tests on both environments, I am hoping to > > get some ideas here on which place to start. > > > -- > > 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 > > google-appengine-java@googlegroups.com.> To unsubscribe from this group, send > email to > > google-appengine-java+unsubscr...@googlegroups.com.> For more options, visit > this group at > > http://groups.google.com/group/google-appengine-java?hl=en. > > > > > > > > -- 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 google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: QUOTAs, usage limits
Thanks, I suspected that would be the case so will work on a solution that doesn't use Google Elevations API for this. On Aug 16, 4:28 pm, Simon Knott wrote: > It means that you will very likely require a proxy server in the middle. > > GAE doesn't allow you to present a single, static IP address and all > GAE-hosted applications will be detected as the same IP range - I know for > Twitter / Facebook there have been a number of developers who have hit > "their" quota because other applications have been hitting the service from > the same IP. -- 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 google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Can't get log4j working
make sure your log4j.properties gets copied to your classes directory
when you build the application. You should need to use the system
property to tell the application or web server where the file is so
long as the location is on the classpath which WEB-INF/classes is.
On Oct 15, 8:12 pm, Andrew Ducker wrote:
> I have the default log4j.properties in the root of my src folder
> (which is then copied to the war/WEB-INF/classes folder
> automatically).
>
> I have this in my appengine-web.xml:
>
>
>
>
>
> If I do this:
> Logger logger = Logger.getRootLogger();
> logger.warn("Testing!");
>
> then I get this:
> log4j:WARN No appenders could be found for logger (root).
> log4j:WARN Please initialize the log4j system properly.
>
> Any suggestions?
>
> Thanks,
>
> Andy
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[appengine-java] Help ! Datanucleus class cast Exception
Firstly apologies if I have posted in the wrong place, I am sure someone will kindly tell me where is more appropriate. I have built a new application, I have already deployed one with identical architecture successfully but not encountered this error before. My application runs well on Tomcat accessing a local H2 database but when I test again the GAEJ Development server and when I deploy to Google Apps and run for real I get the following exception. I have check all my jar files for multipe versions etc but can't get to the bottom of this, can someone help ? (This trace is from the development server pointing at the same location that Tomcat runs from) java.lang.ClassCastException: org.datanucleus.query.expression.ParameterExpression cannot be cast to org.datanucleus.query.expression.PrimaryExpression at org.datanucleus.store.appengine.query.DatastoreQuery.getSortProperty(DatastoreQuery.java:793) at org.datanucleus.store.appengine.query.DatastoreQuery.addSorts(DatastoreQuery.java:772) at org.datanucleus.store.appengine.query.DatastoreQuery.performExecute(DatastoreQuery.java:231) at org.datanucleus.store.appengine.query.JDOQLQuery.performExecute(JDOQLQuery.java:89) at org.datanucleus.store.query.Query.executeQuery(Query.java:1489) at org.datanucleus.store.query.Query.executeWithArray(Query.java:1371) at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:243) at mseries.routes.model.DataModel.saveTrack(DataModel.java:107) at mseries.routes.servlet.TrackUploadServlet.doGet(TrackUploadServlet.java:74) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:351) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) -- 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 google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Help ! Datanucleus class cast Exception
Update:
Digging into the source code for
org.datanucleus.store.appengine.query.DatastoreQuery.getSortProperty
allowed me to figure out what was causing the problem. In the follow code,
the emboldened on is the one that threw the exception, it will be noticed
that I have ordered by 'keyx' which is my parameter name and NOT the name or
my attribute in the class JDOTrack, changing it to a proper attribute name
works as expected. NB This was not a problem with Datanucleus and the rdbms
persistence manager there.
Query q = pm.newQuery(JDOTrack.class);
q.setFilter("key == keyx ");
q.declareParameters("String keyx");
q.setUnique(true);
* q.setOrdering("keyx ascending");*
res = (JDOTrack) q.execute(key);
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