Hi all,
Im getting the following null pointer exception when i try to persist an object using Hibernate.
Im using Spring's hibernate templates for this.
below i have posted the stack trace i got and i have posted the source files and the mapping file.
Its a big help if anyone could provide an answer.
Thanks in advance
saj
Code:
Exception in thread "main" java.lang.NullPointerException
at com.mysql.jdbc.PreparedStatement.asSql(PreparedStatement.java:649)
at com.mysql.jdbc.PreparedStatement.asSql(PreparedStatement.java:587)
at com.mysql.jdbc.PreparedStatement.toString(PreparedStatement.java:4068)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuffer.append(Unknown Source)
at com.mysql.jdbc.trace.Tracer.printParameters(Tracer.aj:240)
at com.mysql.jdbc.trace.Tracer.printEntering(Tracer.aj:167)
at com.mysql.jdbc.trace.Tracer.entry(Tracer.aj:126)
at com.mysql.jdbc.trace.Tracer.ajc$before$com_mysql_jdbc_trace_Tracer$1$f51c62b8(Tracer.aj:45)
at com.mysql.jdbc.Connection.registerStatement(Connection.java)
at com.mysql.jdbc.Statement.<init>(Statement.java:270)
at com.mysql.jdbc.PreparedStatement.<init>(PreparedStatement.java:500)
at com.mysql.jdbc.Connection.clientPrepareStatement(Connection.java:2187)
at com.mysql.jdbc.Connection.prepareStatement(Connection.java:4829)
at com.mysql.jdbc.Connection.prepareStatement(Connection.java:4734)
at org.apache.commons.dbcp.DelegatingConnection.prepareStatement(DelegatingConnection.java:248)
at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.prepareStatement(PoolingDataSource.java:302)
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:534)
at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:116)
at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:109)
at org.hibernate.jdbc.AbstractBatcher.prepareBatchStatement(AbstractBatcher.java:244)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2382)
at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2335)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2635)
at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:115)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:168)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)
at org.springframework.orm.hibernate3.HibernateAccessor.flushIfNecessary(HibernateAccessor.java:390)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:420)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.saveOrUpdate(HibernateTemplate.java:748)
at com.shopatme.dao.abstractdao.BaseDAOImpl.create(BaseDAOImpl.java:25)
at com.shopatme.dao.userdao.UserDAOImpl.create(UserDAOImpl.java:26)
at com.shopatme.dao.userdao.UserDAOImpl.create(UserDAOImpl.java:1)
at com.shopatme.dao.abstractdao.BaseDAOImpl.create(BaseDAOImpl.java:1)
at com.shopatme.TestClass.main(TestClass.java:25)
Code:
public class BaseDAOImpl<T extends Entity> extends HibernateDaoSupport implements BaseDAO<T> {
public BaseDAOImpl() {
}
@Override
public void create(T t) {
getHibernateTemplate().saveOrUpdate(t);
}
@Override
public void delete(T t) {
getHibernateTemplate().delete(t);
}
@Override
public void update(T t) {
getHibernateTemplate().update(t);
}
@Override
public List<T> findAll(Class<T> t) {
return getHibernateTemplate().find("from" + t.getName());
}
}
Code:
public class UserDAOImpl extends BaseDAOImpl<User> implements UserDAO{
@Override
public User find() {
return null;
}
@Override
public void create(User t) {
super.create(t);
}
@Override
public void delete(User t) {
super.delete(t);
}
@Override
public List<User> findAll(Class<User> t) {
return super.findAll(t);
}
@Override
public void update(User t) {
super.update(t);
}
}
Code:
public class User extends Entity{
/**
*
*/
private static final long serialVersionUID = 2345571475794359466L;
private String userName;
private String password;
private String firstName;
private String lastName;
private String department;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getDepartment() {
return department;
}
public void setDepartment(String department) {
this.department = department;
}
}
Code:
<hibernate-mapping>
<class name="com.shopatme.common.domainobjects.User"
table="user_login">
<id name="id" type="long" column="id">
<generator class="native" />
</id>
<property name="userName" type="string" column="username"/>
<property name="password" type="string" column="password"/>
<join table="user_details">
<key column="" />
<property name="firstName" type="string" column="first_name"/>
<property name="lastName" type="string" column="last_name"/>
<property name="department" type="string" column="department"/>
</join>
</class>
</hibernate-mapping>
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