Please, check if this happens in dev mode only. Try to deploy, it happens
too?
2011/6/10 Anoop John <anoopjoh...@gmail.com>
> Any idea????
>
>
> On Jun 9, 7:58 am, Anoop John <anoopjoh...@gmail.com> wrote:
> > Hi,
> >
> > I have developed an application in two ways:
> >
> > 1) GWT+Mysql+Tomcat - Here the GWT compiler was compiled java code to
> > JS. In the server side the data stored inside the Mysql database. Here
> > i didn't used Google data store. It worked fine when i deployed in
> > tomcat server.
> >
> > 2) GWT+GAE+Tomcat - Here i used the Google Data Store instead of MySql
> > database. This application doesn't worked and crashed at server side.
> > The exception is occured at the code "List<DB_Users>
> > list=(List<DB_Users>) query.execute("username");" . The whole code is
> > given below.
> >
> > PersistenceManager
> > mngr=ServerUtils.getServerutils().getPMF().getPersistenceManager();
> > try{
> > String filter="username==filter";
> > Query query=mngr.newQuery(DB_Users.class);
> > query.setFilter(filter);
> > query.declareParameters("String filter");
> > List<DB_Users> list=(List<DB_Users>)
> query.execute(username);
> > if(list!=null&&list.size()>0){
> > return false;
> > }
> > else{
> > return true;
> > }
> > }
> > catch (Exception e) {
> > e.printStackTrace();
> > }
> > finally{mngr.close();}
> > return false;
> >
> > The error is:
> >
> > java.lang.NullPointerException: No API environment is registered for
> > this thread
> > .
> > at
> > com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppId
> > (DatastoreApiHelper.java:108)
> > at
> > com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppId
> > Namespace(DatastoreApiHelper.java:118)
> > at com.google.appengine.api.datastore.Query.<init>(Query.java:
> > 112)
> > at
> > org.datanucleus.store.appengine.query.DatastoreQuery.validate(Datasto
> > reQuery.java:654)
> > at
> > org.datanucleus.store.appengine.query.DatastoreQuery.performExecute(D
> > atastoreQuery.java:217)
> > at
> > org.datanucleus.store.appengine.query.JDOQLQuery.performExecute(JDOQL
> > Query.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)
> >
> > This code is worked fine with Eclipse(RunAs-->> Web Application)
> >
> > Is there any way to execute this code in tomcat server???
>
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