[jira] Issue Comment Edited: (CAY-1071) NullPointer in BaseQueryMetadata while executing Queri

From: JIRA (Jürgen)
Date: Wed Jun 11 2008 - 17:11:52 EDT

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[ https://issues.apache.org/cayenne/browse/CAY-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12954#action_12954 ]

pille edited comment on CAY-1071 at 6/11/08 2:09 PM:
--------------------------------------------------------------

In my Webapp I have this line:
List result = dbcontext.performQuery(select1);

And then I get this Error:
008-06-11 22:57:25,330 - ERROR (WebInitServlet.java:118) - Fehler: null
java.lang.NullPointerException
        at org.apache.cayenne.query.BaseQueryMetadata.resolve(BaseQueryMetadata.java:100)
        at org.apache.cayenne.query.SelectQueryMetadata.resolve(SelectQueryMetadata.java:45)
        at org.apache.cayenne.query.SelectQuery.getMetaData(SelectQuery.java:148)
        at org.apache.cayenne.util.ObjectContextQueryAction.<init>(ObjectContextQueryAction.java:79)
        at org.apache.cayenne.access.DataContextQueryAction.<init>(DataContextQueryAction.java:49)
        at org.apache.cayenne.access.DataContext.onQuery(DataContext.java:1336)
        at org.apache.cayenne.access.DataContext.performQuery(DataContext.java:1325)
        at de.seliger.jsweb.db.DBUpdate.existsInitialTable(DBUpdate.java:79)
        at de.seliger.jsweb.db.DBUpdate.updateDB(DBUpdate.java:43)
        at de.seliger.jsweb.init.WebInitServlet.init(WebInitServlet.java:60)
        at javax.servlet.GenericServlet.init(GenericServlet.java:212)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1161)
        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:981)
        at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4045)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4351)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
        at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:626)
        at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:553)
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:488)
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
        at org.apache.catalina.core.StandardService.start(StandardService.java:516)
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:566)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

Before I created the context with this lines:
            try {
                dbcontext = DataContext.getThreadDataContext();
            }
            catch(IllegalStateException ex) {
                // handle failure
                dbcontext = DataContext.createDataContext();
            }

The line
DataContext.getThreadDataContext();
throw an catch(IllegalStateException and I musst create the context normal.

      was (Author: pille):
    In my Webapp I have this line:
      List result = dbcontext.performQuery(select1);

The line
DataContext.getThreadDataContext();
throw an catch(IllegalStateException and I musst create a Context normal.

> NullPointer in BaseQueryMetadata while executing Queri
> ------------------------------------------------------
>
> Key: CAY-1071
> URL: https://issues.apache.org/cayenne/browse/CAY-1071
> Project: Cayenne
> Issue Type: Bug
> Components: Cayenne Core Library
> Affects Versions: 3.0
> Environment: openSuSE 10.3, Kernel Linux 2.6.22.17-0.1-default i686, Java 1.6.0_04
> Reporter: Jürgen Seliger
> Assignee: Andrus Adamchik
>
> I figured out a problem (NullPointerException) in Line at org.apache.cayenne.query.BaseQueryMetadata.resolve(BaseQueryMetadata.java:100) in BaseQueryMetadata class. The resolver in line 100
> entity = resolver.lookupObjEntity((Class<?>) root);
> is null and there is no check if there is so.
> The methode getEntityResolver() in DataContext says it could be null. I also recommend to put the surrounding if-statement at the end of all if-else-statements, because all classes are instances of Class.
> Hope I could help you, and you fixe the problem as soon as possible, because I want use cayenne for myself.
> Dear
> Jurgen Seliger

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