Hi Guys / Girls,
I am a newbee on hibernate. Have ben working on hibernate for the past 4 days. I have a small problem. I have 2 tables namely Validator and ValidatorType.
ValidatorType is the parent table and Validator is the child table, i.e. Validator has a foreign key from ValidatorType many to one relationship.
The problem is that when ever i execute the fetch query for ValidatorType it works. But when i execute the fetch query for Validator it throws me the following error:
Exception in thread "main" java.lang.NullPointerException
at org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:372)
at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:3121)
at org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:232)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:173)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:891)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:859)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
at org.hibernate.type.EntityType.resolve(EntityType.java:303)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:113)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
at org.hibernate.loader.Loader.doQuery(Loader.java:717)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2145)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
at org.hibernate.loader.Loader.list(Loader.java:2024)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:375)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:308)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:153)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1129)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at com.insync.ems.event.ValidatorManager.getAllValidators(ValidatorManager.java:124)
at com.insync.ems.event.EventManager.getAllValidators(EventManager.java:964)
at TestEvent.main(TestEvent.java:32)
Hibernate: select validator0_.ID as ID21_, validator0_.NAME as NAME21_, validator0_.STATUS as STATUS21_, validator0_.VALUE as VALUE21_, validator0_.DESCRIPTION as DESCRIPT5_21_, validator0_.VALIDATOR_TYPE_ID as VALIDATOR6_21_, validator0_.CREATE_TIME as CREATE7_21_, validator0_.CREATED_BY as CREATED8_21_, validator0_.MODIFY_TIME as MODIFY9_21_, validator0_.MODIFIED_BY as MODIFIED10_21_ from em_validators validator0_
I have added to POJO in validator type class and the validator class code is as follows:
ValidatorType.java
package com.insync.ems.validator;
import java.io.Serializable;
import java.util.Set;
public class ValidatorType implements Serializable
{
/**
* This attribute maps to the column ID in the em_validator_types table.
*/
private Long id;
/**
* This attribute maps to the column NAME in the em_validator_types table.
*/
private String name;
/**
* This attribute maps to the column STATUS in the em_validator_types table.
*/
private int status;
/**
* This attribute maps to the column DESCRIPTION in the em_validator_types table.
*/
private String description;
/**
* This attribute maps to the column VALIDATOR_TYPE in the em_validator_types table.
*/
private String validatorType;
/**
* This attribute maps to the column CLASSNAME in the em_validator_types table.
*/
private String classname;
/**
* This attribute maps to the column CREATE_TIME in the em_validator_types table.
*/
private long createTime;
/**
* This attribute maps to the column CREATED_BY in the em_validator_types table.
*/
private String createdBy;
/**
* This attribute maps to the column MODIFY_TIME in the em_validator_types table.
*/
private long modifyTime;
/**
* This attribute represents whether the primitive attribute modifyTime is null.
*/
private boolean modifyTimeNull = true;
/**
* This attribute maps to the column MODIFIED_BY in the em_validator_types table.
*/
private String modifiedBy;
private Set validators = null;
/**
* Method 'ValidatorType'
*
*/
public ValidatorType()
{
}
/**
* Method 'getId'
*
* @return long
*/
public Long getId()
{
return id;
}
/**
* Method 'setId'
*
* @param id
*/
public void setId(Long id)
{
this.id = id;
}
/**
* Method 'getName'
*
* @return String
*/
public String getName()
{
return name;
}
/**
* Method 'setName'
*
* @param name
*/
public void setName(String name)
{
this.name = name;
}
/**
* Method 'getStatus'
*
* @return int
*/
public int getStatus()
{
return status;
}
/**
* Method 'setStatus'
*
* @param status
*/
public void setStatus(int status)
{
this.status = status;
}
/**
* Method 'getDescription'
*
* @return String
*/
public String getDescription()
{
return description;
}
/**
* Method 'setDescription'
*
* @param description
*/
public void setDescription(String description)
{
this.description = description;
}
/**
* Method 'getValidatorType'
*
* @return String
*/
public String getValidatorType()
{
return validatorType;
}
/**
* Method 'setValidatorType'
*
* @param validatorType
*/
public void setValidatorType(String validatorType)
{
this.validatorType = validatorType;
}
/**
* Method 'getClassname'
*
* @return String
*/
public String getClassname()
{
return classname;
}
/**
* Method 'setClassname'
*
* @param classname
*/
public void setClassname(String classname)
{
this.classname = classname;
}
/**
* Method 'getCreateTime'
*
* @return long
*/
public long getCreateTime()
{
return createTime;
}
/**
* Method 'setCreateTime'
*
* @param createTime
*/
public void setCreateTime(long createTime)
{
this.createTime = createTime;
}
/**
* Method 'getCreatedBy'
*
* @return String
*/
public String getCreatedBy()
{
return createdBy;
}
/**
* Method 'setCreatedBy'
*
* @param createdBy
*/
public void setCreatedBy(String createdBy)
{
this.createdBy = createdBy;
}
/**
* Method 'getModifyTime'
*
* @return long
*/
public long getModifyTime()
{
return modifyTime;
}
/**
* Method 'setModifyTime'
*
* @param modifyTime
*/
public void setModifyTime(long modifyTime)
{
this.modifyTime = modifyTime;
setModifyTimeNull( false );
}
/**
* Sets the value of modifyTimeNull
*/
public void setModifyTimeNull(boolean modifyTimeNull)
{
this.modifyTimeNull = modifyTimeNull;
}
/**
* Gets the value of modifyTimeNull
*/
public boolean isModifyTimeNull()
{
return modifyTimeNull;
}
/**
* Method 'getModifiedBy'
*
* @return String
*/
public String getModifiedBy()
{
return modifiedBy;
}
/**
* Method 'setModifiedBy'
*
* @param modifiedBy
*/
public void setModifiedBy(String modifiedBy)
{
this.modifiedBy = modifiedBy;
}
/**
* Method 'equals'
*
* @param _other
* @return boolean
*/
public boolean equals(Object _other)
{
if (_other == null) {
return false;
}
if (_other == this) {
return true;
}
if (!(_other instanceof ValidatorType)) {
return false;
}
final ValidatorType _cast = (ValidatorType) _other;
if (id != _cast.id) {
return false;
}
if (name == null ? _cast.name != name : !name.equals( _cast.name )) {
return false;
}
if (status != _cast.status) {
return false;
}
if (description == null ? _cast.description != description : !description.equals( _cast.description )) {
return false;
}
if (validatorType == null ? _cast.validatorType != validatorType : !validatorType.equals( _cast.validatorType )) {
return false;
}
if (classname == null ? _cast.classname != classname : !classname.equals( _cast.classname )) {
return false;
}
if (createTime != _cast.createTime) {
return false;
}
if (createdBy == null ? _cast.createdBy != createdBy : !createdBy.equals( _cast.createdBy )) {
return false;
}
if (modifyTime != _cast.modifyTime) {
return false;
}
if (modifyTimeNull != _cast.modifyTimeNull) {
return false;
}
if (modifiedBy == null ? _cast.modifiedBy != modifiedBy : !modifiedBy.equals( _cast.modifiedBy )) {
return false;
}
return true;
}
/**
* Method 'hashCode'
*
* @return int
*/
public int hashCode()
{
int _hashCode = 0;
_hashCode = 29 * _hashCode + (int) (id.longValue() ^ (id.longValue() >>> 32));
if (name != null) {
_hashCode = 29 * _hashCode + name.hashCode();
}
_hashCode = 29 * _hashCode + status;
if (description != null) {
_hashCode = 29 * _hashCode + description.hashCode();
}
if (validatorType != null) {
_hashCode = 29 * _hashCode + validatorType.hashCode();
}
if (classname != null) {
_hashCode = 29 * _hashCode + classname.hashCode();
}
_hashCode = 29 * _hashCode + (int) (createTime ^ (createTime >>> 32));
if (createdBy != null) {
_hashCode = 29 * _hashCode + createdBy.hashCode();
}
_hashCode = 29 * _hashCode + (int) (modifyTime ^ (modifyTime >>> 32));
_hashCode = 29 * _hashCode + (modifyTimeNull ? 1 : 0);
if (modifiedBy != null) {
_hashCode = 29 * _hashCode + modifiedBy.hashCode();
}
return _hashCode;
}
/**
* Method 'createPk'
*
* @return ValidatorTypePk
*/
public ValidatorTypePk createPk()
{
return new ValidatorTypePk(id);
}
/**
* Method 'toString'
*
* @return String
*/
public String toString()
{
StringBuffer ret = new StringBuffer();
ret.append( "com.insync.ems.dto.ValidatorType: " );
ret.append( "id='" + id + "'" );
ret.append( ", name='" + name + "'" );
ret.append( ", status='" + status + "'" );
ret.append( ", description='" + description + "'" );
ret.append( ", validatorType='" + validatorType + "'" );
ret.append( ", classname='" + classname + "'" );
ret.append( ", createTime='" + createTime + "'" );
ret.append( ", createdBy='" + createdBy + "'" );
ret.append( ", modifyTime='" + modifyTime + "'" );
ret.append( ", modifiedBy='" + modifiedBy + "'" );
return ret.toString();
}
/**
* @param validators The validators to set.
*/
public void setValidators(Set validators) {
this.validators = validators;
}
/**
* @return Returns the validators.
*/
public Set getValidators() {
return validators;
}
}
Validator.java
package com.insync.ems.validator;
import java.io.Serializable;
import java.util.Set;
public class Validator implements Serializable
{
/**
*
*/
private static final long serialVersionUID = -383534651242266882L;
/**
* This attribute maps to the column ID in the em_validators table.
*/
private Long id;
/**
* This attribute maps to the column NAME in the em_validators table.
*/
private String name;
/**
* This attribute maps to the column STATUS in the em_validators table.
*/
private int status;
/**
* This attribute maps to the column VALUE in the em_validators table.
*/
private byte[] value;
/**
* This attribute maps to the column DESCRIPTION in the em_validators table.
*/
private String description;
/**
* This attribute maps to the column CREATE_TIME in the em_validators table.
*/
private long createTime;
/**
* This attribute maps to the column CREATED_BY in the em_validators table.
*/
private String createdBy;
/**
* This attribute maps to the column MODIFY_TIME in the em_validators table.
*/
private long modifyTime;
/**
* This attribute represents whether the primitive attribute modifyTime is null.
*/
private boolean modifyTimeNull = true;
/**
* This attribute maps to the column MODIFIED_BY in the em_validators table.
*/
private String modifiedBy;
private ValidatorType validatorType;
private Set event;
/**
* Method 'Validator'
*
*/
public Validator()
{
}
/**
* Method 'getId'
*
* @return long
*/
public Long getId()
{
return id;
}
/**
* Method 'setId'
*
* @param id
*/
public void setId(Long id)
{
this.id = id;
}
/**
* Method 'getName'
*
* @return String
*/
public String getName()
{
return name;
}
/**
* Method 'setName'
*
* @param name
*/
public void setName(String name)
{
this.name = name;
}
/**
* Method 'getStatus'
*
* @return int
*/
public int getStatus()
{
return status;
}
/**
* Method 'setStatus'
*
* @param status
*/
public void setStatus(int status)
{
this.status = status;
}
/**
* Method 'getValue'
*
* @return byte[]
*/
public byte[] getValue()
{
return value;
}
/**
* Method 'setValue'
*
* @param value
*/
public void setValue(byte[] value)
{
this.value = value;
}
/**
* Method 'getDescription'
*
* @return String
*/
public String getDescription()
{
return description;
}
/**
* Method 'setDescription'
*
* @param description
*/
public void setDescription(String description)
{
this.description = description;
}
/**
* Method 'getCreateTime'
*
* @return long
*/
public long getCreateTime()
{
return createTime;
}
/**
* Method 'setCreateTime'
*
* @param createTime
*/
public void setCreateTime(long createTime)
{
this.createTime = createTime;
}
/**
* Method 'getCreatedBy'
*
* @return String
*/
public String getCreatedBy()
{
return createdBy;
}
/**
* Method 'setCreatedBy'
*
* @param createdBy
*/
public void setCreatedBy(String createdBy)
{
this.createdBy = createdBy;
}
/**
* Method 'getModifyTime'
*
* @return long
*/
public long getModifyTime()
{
return modifyTime;
}
/**
* Method 'setModifyTime'
*
* @param modifyTime
*/
public void setModifyTime(long modifyTime)
{
this.modifyTime = modifyTime;
setModifyTimeNull( false );
}
/**
* Sets the value of modifyTimeNull
*/
public void setModifyTimeNull(boolean modifyTimeNull)
{
this.modifyTimeNull = modifyTimeNull;
}
/**
* Gets the value of modifyTimeNull
*/
public boolean isModifyTimeNull()
{
return modifyTimeNull;
}
/**
* Method 'getModifiedBy'
*
* @return String
*/
public String getModifiedBy()
{
return modifiedBy;
}
/**
* Method 'setModifiedBy'
*
* @param modifiedBy
*/
public void setModifiedBy(String modifiedBy)
{
this.modifiedBy = modifiedBy;
}
/**
* Method 'equals'
*
* @param _other
* @return boolean
*/
public boolean equals(Object _other)
{
if (_other == null) {
return false;
}
if (_other == this) {
return true;
}
if (!(_other instanceof Validator)) {
return false;
}
final Validator _cast = (Validator) _other;
if (id != _cast.id) {
return false;
}
if (name == null ? _cast.name != name : !name.equals( _cast.name )) {
return false;
}
if (status != _cast.status) {
return false;
}
if (value == null ? _cast.value != value : !value.equals( _cast.value )) {
return false;
}
if (description == null ? _cast.description != description : !description.equals( _cast.description )) {
return false;
}
if (createTime != _cast.createTime) {
return false;
}
if (createdBy == null ? _cast.createdBy != createdBy : !createdBy.equals( _cast.createdBy )) {
return false;
}
if (modifyTime != _cast.modifyTime) {
return false;
}
if (modifyTimeNull != _cast.modifyTimeNull) {
return false;
}
if (modifiedBy == null ? _cast.modifiedBy != modifiedBy : !modifiedBy.equals( _cast.modifiedBy )) {
return false;
}
return true;
}
/**
* Method 'hashCode'
*
* @return int
*/
public int hashCode()
{
int _hashCode = 0;
_hashCode = 29 * _hashCode + (int) (id.longValue() ^ (id.longValue() >>> 32));
if (name != null) {
_hashCode = 29 * _hashCode + name.hashCode();
}
_hashCode = 29 * _hashCode + status;
if (value != null) {
_hashCode = 29 * _hashCode + value.hashCode();
}
if (description != null) {
_hashCode = 29 * _hashCode + description.hashCode();
}
_hashCode = 29 * _hashCode + (int) (createTime ^ (createTime >>> 32));
if (createdBy != null) {
_hashCode = 29 * _hashCode + createdBy.hashCode();
}
_hashCode = 29 * _hashCode + (int) (modifyTime ^ (modifyTime >>> 32));
_hashCode = 29 * _hashCode + (modifyTimeNull ? 1 : 0);
if (modifiedBy != null) {
_hashCode = 29 * _hashCode + modifiedBy.hashCode();
}
return _hashCode;
}
/**
* Method 'createPk'
*
* @return ValidatorPk
*/
public ValidatorPk createPk()
{
return new ValidatorPk(id);
}
/**
* Method 'toString'
*
* @return String
*/
public String toString()
{
StringBuffer ret = new StringBuffer();
ret.append( "com.insync.ems.dto.Validator: " );
ret.append( "id='" + id + "'" );
ret.append( ", name='" + name + "'" );
ret.append( ", status='" + status + "'" );
ret.append( ", value='" + value + "'" );
ret.append( ", description='" + description + "'" );
ret.append( ", createTime='" + createTime + "'" );
ret.append( ", createdBy='" + createdBy + "'" );
ret.append( ", modifyTime='" + modifyTime + "'" );
ret.append( ", modifiedBy='" + modifiedBy + "'" );
return ret.toString();
}
/**
* @param validatorType The validatorType to set.
*/
public void setValidatorType(ValidatorType validatorType) {
this.validatorType = validatorType;
}
/**
* @return Returns the validatorType.
*/
public ValidatorType getValidatorType() {
return validatorType;
}
/**
* @param event The event to set.
*/
public void setEvent(Set event) {
this.event = event;
}
/**
* @return Returns the event.
*/
public Set getEvent() {
return event;
}
}
validatorType.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.insync.ems.validator.ValidatorType" table="em_validator_types">
<id name="id" column="ID" type="long">
<generator class="org.hibernate.id.TableHiLoGenerator">
<param name="table">hibernate_unique_key</param>
<param name="column">next_hi</param>
</generator>
</id>
<property name="name" column="NAME" not-null="true" />
<property name="status" column="STATUS" not-null="true" />
<property name="description" column="DESCRIPTION" />
<property name="validatorType" column="VALIDATOR_TYPE" not-null="true" />
<property name="classname" column="CLASSNAME" not-null="true" />
<property name="createTime" column="CREATE_TIME" not-null="true" />
<property name="createdBy" column="CREATED_BY" not-null="true" />
<property name="modifyTime" column="MODIFY_TIME" />
<property name="modifiedBy" column="MODIFIED_BY" />
<set name="Validators" inverse="true" cascade="all">
<key column="ID"/>
<one-to-many class="com.insync.ems.validator.Validator"/>
</set>
</class>
<query name="com.insync.ems.validator.ValidatorManager.ValidatorType.all">
<![CDATA[from com.insync.ems.validator.ValidatorType as v]]>
</query>
<query name="com.insync.ems.validator.ValidatorManager.ValidatorType.by.name">
<![CDATA[from com.insync.ems.validator.ValidatorType as v where ucase(v.name)=ucase(?)]]>
</query>
<query name="com.insync.ems.validator.ValidatorManager.ValidatorType.by.status">
<![CDATA[from com.insync.ems.validator.ValidatorType as v where v.status=?]]>
</query>
<query name="com.insync.ems.validator.ValidatorManager.ValidatorType.by.validatorType">
<![CDATA[from com.insync.ems.validator.ValidatorType as v where ucase(v.validatorType)=ucase(?)]]>
</query>
</hibernate-mapping>
Validator.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.insync.ems.validator.Validator" table="em_validators">
<id name="id" column="ID" type="long">
<generator class="org.hibernate.id.TableHiLoGenerator">
<param name="table">hibernate_unique_key</param>
<param name="column">next_hi</param>
</generator>
</id>
<!-- <property name="id" column="ID" not-null="true" />-->
<property name="name" column="NAME" not-null="true" />
<property name="status" column="STATUS" not-null="true" />
<property name="value" column="VALUE" not-null="true" />
<property name="description" column="DESCRIPTION" />
<many-to-one name="validatorType" column="VALIDATOR_TYPE_ID" class="com.insync.ems.validator.ValidatorType"/>
<property name="createTime" column="CREATE_TIME" not-null="true" />
<property name="createdBy" column="CREATED_BY" not-null="true" />
<property name="modifyTime" column="MODIFY_TIME" />
<property name="modifiedBy" column="MODIFIED_BY" />
<set name="event" inverse="true" cascade="all">
<key column="ID"/>
<one-to-many class="com.insync.ems.event.Event"/>
</set>
</class>
<query name="com.insync.ems.validator.ValidatorManager.Validator.all">
<![CDATA[from com.insync.ems.validator.Validator as v]]>
</query>
</hibernate-mapping>
I know there is something wrong in the query to fetch Validator. It is not able to fetch the ValidatorType object i believe cause i am not specifying the Join. But i am not sure how to solve it.
I would really appreciate if someone could help me out. Need to give to project by monday.
Any help would be appreciated.
REgards,
Milton
Hibernate version: 3.1
Mapping documents: 3.0
Code between sessionFactory.openSession() and session.close():
Full stack trace of any exception that occurs:
Name and version of the database you are using: MySQL 4.1
The generated SQL (show_sql=true):
Debug level Hibernate log excerpt:
[quote][/quote][code][/code]
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