Re: [Hibernate] NullPointerException on Session.find

[Gavin K. <ga...@ap...>]

You create a local variable myS that hides the instance variable

> Session myS = sf.openSession();

should be

myS = sf.openSession();

----- Original Message -----
From: "Boring, Jeff W, ALBAS" <jb...@at...>
To: "Gavin King" <ga...@ap...>;
<hib...@li...>
Sent: Tuesday, October 01, 2002 4:15 AM
Subject: RE: [Hibernate] NullPointerException on Session.find


> >Nothing obviously wrong in what you have given so far.<
>
> That's good news. At least I'm not totally off track!
>
> > you will have to show a bit more code than that....<
>
> here it is:
>
> public class JWBDemo {
>
> private static SessionFactory sf;
> private static Datastore ds;
> private static Session myS;
>
> public static void main( String[] no_args ) throws Exception {
>
> ds = Hibernate.createDatastore()
> .storeClass(Edge.class)
> .storeClass(Vertex.class)
> .storeClass(Department.class);
>
> sf = ds.buildSessionFactory();
> Session myS = sf.openSession();
> doDept();
> }
>
> public static void doDept() throws Exception {
>
> String name = null;
> List depts = null;
> Department aDept = null;
> String Id = new String ("A00");
>
> try {
> depts = myS.find(
> "from Department in class boring.sandbox.Department" );
> Iterator it = depts.iterator();
> aDept = (Department) it.next();
> name = aDept.getName();
> System.out.println(aDept);
> }
> catch (Exception e){
> e.printStackTrace();
> }
> }
>
> -----Original Message-----
> From: Gavin King [mailto:ga...@ap...]
> Sent: Monday, September 30, 2002 2:12 PM
> To: Boring, Jeff W, ALBAS; hib...@li...
> Subject: Re: [Hibernate] NullPointerException on Session.find
>
>
> Hmmmm. not sure. you will have to show a bit more code than that....
>
> Nothing obviously wrong in what you have given so far.
>
> ----- Original Message -----
> From: "Boring, Jeff W, ALBAS" <jb...@at...>
> To: <hib...@li...>
> Sent: Tuesday, October 01, 2002 3:58 AM
> Subject: [Hibernate] NullPointerException on Session.find
>
>
> > Help!!!!
> >
> > Newbie here trying some basic code and getting a nullpointer on the
find.
> I know it is something stupid I'm doing. Thanks for any help.
> >
> > Code is:
> >
> > depts = myS.find("from Department in class boring.sandbox.Department" );
> >
> > ---------------------- console ----------------------
> > [INFO] DatastoreImpl - -Mapping resource:
cirrus/hibernate/eg/Edge.hbm.xml
> > [INFO] XMLHelper - -Parsing XML: unknown system id
> > [INFO] DatastoreImpl - -Mapping resource:
> cirrus/hibernate/eg/Vertex.hbm.xml
> > [INFO] XMLHelper - -Parsing XML: unknown system id
> > [INFO] Environment - -loaded properties from resource
hibernate.properties
> > [INFO] Environment - -echoing all SQL to stdout
> > [INFO] Environment - -using java.io streams to persist binary types
> > [INFO] Environment - -JVM proxy support: true
> > [WARN] Collection - -Attribute "order-by" ignored in JDK1.3 or less
> > [WARN] Collection - -Attribute "order-by" ignored in JDK1.3 or less
> > [INFO] DatastoreImpl - -Mapping resource:
> boring/sandbox/Department.hbm.xml
> > [INFO] XMLHelper - -Parsing XML: unknown system id
> > [INFO] Dialect - -Using dialect: class cirrus.hibernate.sql.DB2Dialect
> > [INFO] DriverManagerConnectionProvider - -Hibernate connection pool
size:
> 2
> > [INFO] DriverManagerConnectionProvider - -Using driver:
> COM.ibm.db2.jdbc.app.DB2Driver at URL: jdbc:db2:sample
> > [INFO] DriverManagerConnectionProvider - -Connection properties:
> {user=hibernate, password=thisIsStupid!}
> > [INFO] PreparedStatementCache - -prepared statement cache size: 100
> > [INFO] SessionFactoryImpl - -Use outer join fetching: true
> > [INFO] SessionFactoryImpl - -Use scrollable result sets: true
> > [INFO] SessionFactoryImpl - -Use JDBC 2 batch updates: false
> > [WARN] SessionFactoryObjectFactory - -no JDNI name configured
> > [INFO] SessionFactoryImpl - -Query language substitutions: {false=0,
> no='N', yes='Y', true=1}
> > [INFO] SessionFactoryImpl - -Query language imports:
cirrus.hibernate.test
> > java.lang.NullPointerException
> > at boring.sandbox.JWBDemo.doDept(JWBDemo.java:50)
> > at boring.sandbox.JWBDemo.main(JWBDemo.java:38)
> > ---------------------- console ----------------------
> > ---------------------- Department.java ----------------------
> > package boring.sandbox;
> > public class Department {
> > private String name = null;
> > private String number = null;
> > private String location = null;
> >
> > public void Department(){
> > }
> >
> > public String getName(){
> > return name;
> > }
> > public String getNumber(){
> > return number;
> > }
> > public String getLocation(){
> > return location;
> > }
> > public void setName (String parm){
> > name = parm;
> > }
> > public void setNumber (String parm){
> > number = parm;
> > }
> > public void setLocation (String parm){
> > location = parm;
> > }
> > }
> > ---------------------- Department.java ----------------------
> >
> > ---------------------- DB Table DDL ----------------------
> >  CREATE TABLE "DB2ADMIN"."DEPARTMENT"  (
> >   "DEPTNO" CHAR(3) NOT NULL ,
> >   "DEPTNAME" VARCHAR(29) NOT NULL ,
> >   "MGRNO" CHAR(6) ,
> >   "ADMRDEPT" CHAR(3) NOT NULL ,
> >   "LOCATION" CHAR(16) )
> > IN "USERSPACE1" ;
> >
> > ALTER TABLE "DB2ADMIN"."DEPARTMENT"
> > ADD CONSTRAINT "PKEY" PRIMARY KEY
> > ("DEPTNO");
> > ---------------------- DB Table DDL ----------------------
> >
> > ---------------------- Department.hbn.xml ----------------------
> > <?xml version="1.0"?>
> > <!DOCTYPE hibernate-mapping PUBLIC
> >         "-//Hibernate/Hibernate Mapping DTD//EN"
> >         "http://hibernate.sourceforge.net/hibernate-mapping.dtd">
> >
> > <hibernate-mapping>
> >
> >   <class name="boring.sandbox.Department" table="department"
> schema="db2admin">
> >
> >     <!-- comment -->
> >     <id column="DEPTNO" name="number" type="string">
> >       <generator class="assigned"/>
> >     </id>
> >
> >     <property name="name" column="DEPTNAME" type="string" />
> >     <property name="location" column="LOCATION" type="string" />
> >
> >   </class>
> >
> > </hibernate-mapping>
> > ---------------------- Department.hbn.xml ----------------------
> >
> > Jeff Boring
> > Custom & Web Services Development
> > AT&T Labs
> > jb...@at...
> > (813) 878-3367
> >
> >
> >
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>
>
>
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