PropertyNotFoundException: Could not find a getter for null

mota · **Joined:** Wed Nov 05, 2003 10:57 pm **Posts:** 96

I am using hibernate-2.0.3 with the MEagle's Xdoclet tutorial: http://www.meagle.com:8080/hibernate.jsp. I started with the association: User 1 ---- * Contact . I was able to generate the mappings and export the schema to mysql4.0.16. But when I tried to build the SessionFactory I got the following exception:
net.sf.hibernate.PropertyNotFoundException: Could not find a getter for null in class dbdemo.User

Below are the persistent objects, generated mappings, code snippet from Test class, and the exception thrown:

package dbdemo;

import java.util.Date;
import java.util.Set;

/**
* @hibernate.class table="Users"
*
* @author MEagle
*
* Represents a User
*/
public class User {

private String userID;
private String userName;
private String password;
private String emailAddress;
private Date lastLogon;
private Set contacts;

public User(){
}

/**
* @hibernate.property column="EmailAddress" type="string"
* @return
*/
public String getEmailAddress() {
return emailAddress;
}

/**
* @hibernate.property column="LastLogon" type="date"
* @return
*/
public Date getLastLogon() {
return lastLogon;
}

/**
* @hibernate.property column="Password" type="string"
* @return
*/
public String getPassword() {
return password;
}

/**
* @hibernate.id generator-class="native" type="string"
* column="LogonID"
* @return
*/
public String getUserID() {
return userID;
}

/**
* @hibernate.property column="Name" type="string"
* @return
*/
public String getUserName() {
return userName;
}

/**
* @param string
*/
public void setEmailAddress(String string) {
emailAddress = string;
}

/**
* @param string
*/
public void setLastLogon(Date date) {
lastLogon = date;
}

/**
* @param string
*/
public void setPassword(String string) {
password = string;
}

/**
* @param string
*/
public void setUserID(String string) {
userID = string;
}

/**
* @param string
*/
public void setUserName(String string) {
userName = string;
}

/**
* @hibernate.set role="contacts" table="Contacts"
* cascade="all" readonly="true"
* @hibernate.collection-key column="User_ID"
* @hibernate.collection-one-to-many class="dbdemo.Contact"
* @return
*/
public Set getContacts() {
return contacts;
}

/**
* @param set
*/
public void setContacts(Set set) {
contacts = set;
}
}

package dbdemo;

/**
* @author MEagle
* @hibernate.class table="Contacts"
* Represents a contact.
*/
public class Contact {

private long contactId;
private String name;
private String email;

// foreign key field for the parent
private String userId;

// relationship field
private User user;

public Contact(){
}

/**
* @hibernate.id generator-class="native" type="integer" column="ID"
*
* @return long
*/
public long getContactId() {
// use this if you are using a dialect that does not support sequences
// @hibernate.id generator-class="native" type="integer" column="ID"

// Use this if you are using a dialect that supports sequences
// @hibernate.id generator-class="sequence" type="long" column="ID"
// @hibernate.generator-param name="sequence" value="seq"
return contactId;
}

/**
* @hibernate.property column="EmailAddress" type="string"
* @return String
*/
public String getEmail() {
return email;
}

/**
* @hibernate.property column="Name" type="string"
* @return String
*/
public String getName() {
return name;
}

/**
* @param long
*/
public void setContactId(long l) {
contactId = l;
}

/**
* @param string
*/
public void setEmail(String string) {
email = string;
}

/**
* @param string
*/
public void setName(String string) {
name = string;
}

/**
* @return String
*/
public String getUserId() {
return userId;
}

/**
* @param string
*/
public void setUserId(String string) {
userId = string;
}

/**
* @hibernate.many-to-one column="User_ID" class="dbdemo.User"
* @return User
*/
public User getUser() {
return user;
}

/**
* @param user
*/
public void setUser(User user) {
this.user = user;
}

}

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 1.1//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-1.1.dtd">

<hibernate-mapping>
<class
name="dbdemo.User"
table="Users"
>

<id
name="userID"
column="LogonID"
type="string"
unsaved-value="any"
>
<generator class="native">
</generator>
</id>

<property
name="emailAddress"
type="string"
column="EmailAddress"
/>

<property
name="lastLogon"
type="date"
column="LastLogon"
/>

<property
name="password"
type="string"
column="Password"
/>

<property
name="userName"
type="string"
column="Name"
/>

<set
role="contacts"
table="Contacts"
lazy="false"
readonly="true"
cascade="all"
sort="unsorted"
>

<key
column="User_ID"
/>

<one-to-many
class="dbdemo.Contact"
/>
</set>



</class>

</hibernate-mapping>

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 1.1//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-1.1.dtd">

<hibernate-mapping>
<class
name="dbdemo.Contact"
table="Contacts"
>

<id
name="contactId"
column="ID"
type="integer"
unsaved-value="any"
>
<generator class="native">
</generator>
</id>

<property
name="email"
type="string"
column="EmailAddress"
/>

<property
name="name"
type="string"
column="Name"
/>

<many-to-one
name="user"
class="dbdemo.User"
cascade="none"
outer-join="auto"
column="User_ID"
/>



</class>

</hibernate-mapping>

.......
Configuration configuration = new Configuration();
Properties properties = new Properties();
properties.load(Test.class.getClassLoad().getResourceAsStream("test/hibernate(mysql).properties"));
configuration.setProperties(properties);

configuration.addClass(dbdemo.User.class);
configuration.addClass(dbdemo.Contact.class);

SessionFactory sessionFactory = configuration.buildSessionFactory(); // Line 26
......

Nov 5, 2003 10:06:07 PM net.sf.hibernate.cfg.Environment <clinit>
INFO: Hibernate 2.0.3
Nov 5, 2003 10:06:08 PM net.sf.hibernate.cfg.Environment <clinit>
INFO: hibernate.properties not found
Nov 5, 2003 10:06:08 PM net.sf.hibernate.cfg.Environment <clinit>
INFO: using CGLIB reflection optimizer
Nov 5, 2003 10:06:08 PM net.sf.hibernate.cfg.Environment <clinit>
INFO: JVM proxy support: true
Nov 5, 2003 10:06:08 PM net.sf.hibernate.cfg.Configuration addClass
INFO: Mapping resource: dbdemo/User.hbm.xml
Nov 5, 2003 10:06:08 PM net.sf.hibernate.cfg.Binder bindRootClass
INFO: Mapping class: dbdemo.User -> Users
Nov 5, 2003 10:06:09 PM net.sf.hibernate.cfg.Configuration addClass
INFO: Mapping resource: dbdemo/Contact.hbm.xml
Nov 5, 2003 10:06:09 PM net.sf.hibernate.cfg.Binder bindRootClass
INFO: Mapping class: dbdemo.Contact -> Contacts
Nov 5, 2003 10:06:09 PM net.sf.hibernate.cfg.Configuration secondPassCompile
INFO: processing one-to-many association mappings
Nov 5, 2003 10:06:09 PM net.sf.hibernate.cfg.Binder bindCollectionSecondPass
INFO: Mapping collection: dbdemo.User.null -> Contacts
Nov 5, 2003 10:06:09 PM net.sf.hibernate.cfg.Configuration secondPassCompile
INFO: processing foreign key constraints
Nov 5, 2003 10:06:09 PM net.sf.hibernate.impl.SessionFactoryImpl <init>
INFO: building session factory
Nov 5, 2003 10:06:09 PM net.sf.hibernate.dialect.Dialect <init>
INFO: Using dialect: net.sf.hibernate.dialect.MySQLDialect
Nov 5, 2003 10:06:09 PM net.sf.hibernate.connection.DriverManagerConnectionProvider configure
INFO: Hibernate connection pool size: 10
Nov 5, 2003 10:06:09 PM net.sf.hibernate.connection.DriverManagerConnectionProvider configure
INFO: using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://localhost/hibernate
Nov 5, 2003 10:06:09 PM net.sf.hibernate.connection.DriverManagerConnectionProvider configure
INFO: connection properties: {}
Nov 5, 2003 10:06:09 PM net.sf.hibernate.ps.PreparedStatementCache <init>
INFO: prepared statement cache size: 25
Nov 5, 2003 10:06:09 PM net.sf.hibernate.impl.SessionFactoryImpl <init>
INFO: Use outer join fetching: true
Nov 5, 2003 10:06:10 PM net.sf.hibernate.impl.SessionFactoryImpl <init>
INFO: Use scrollable result sets: true
Nov 5, 2003 10:06:10 PM net.sf.hibernate.impl.SessionFactoryImpl <init>
INFO: echoing all SQL to stdout
net.sf.hibernate.PropertyNotFoundException: Could not find a getter for null in class dbdemo.User
at net.sf.hibernate.util.ReflectHelper.getGetter(ReflectHelper.java:206)
at net.sf.hibernate.persister.AbstractEntityPersister.<init>(AbstractEntityPersister.java:571)
at net.sf.hibernate.persister.EntityPersister.<init>(EntityPersister.java:665)
at net.sf.hibernate.persister.PersisterFactory.create(PersisterFactory.java:29)
at net.sf.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:207)
at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:627)
at test.Test.main(Test.java:26)

Thank you very much.

Mota

emmanuel · **Posted:** Thu Nov 06, 2003 7:30 am

You're using a generator for Hibernate 1.x.

Code:

 <set
role="contacts"
table="Contacts"
lazy="false"
readonly="true"
cascade="all"
sort="unsorted"
> 

should be

Code:

 <set
name="contacts"
table="Contacts"
lazy="false"
readonly="true"
cascade="all"
sort="unsorted"
> 

And

Code:

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 1.1//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-1.1.dtd"> 

should be

Code:

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"> 

Use a proper generator.