On 9/17/07, adriel manalansan <[EMAIL PROTECTED]> wrote:
> Hello everybody,
>
> I think this is a stupid question but I really cant make it work. I am
> using appfuse 1.9.4 and webwork. In appfuse, it is default that
> BaseObject class implements java.io.Serializable. I have a superclass
> named BaseModel:
>
> public abstract class BaseModel extends BaseObject implements
> Serializable {
>
> private Long id;
>
>
> public Long getId() {
> return id;
> }
>
> public void setId(Long id) {
> this.id = id;
> }
>
> }
>
>
> and I have a Study object:
>
> public class Study extends BaseModel implements Comparable<Study> {
> private static final long serialVersionUID = 12345L;
>
>
> private String name;
> private Set<StudyPageSet> studyPageSets = new TreeSet();
> private Set<StudyPage> studyPages = new TreeSet();
>
> public Study() {}
>
> public Study( String name ){
> this.setName(name);
> }
>
>
> public Set<StudyPageSet> getStudyPageSets() {
> return studyPageSets;
> }
>
> public void setStudyPageSets(Set<StudyPageSet> studyPageSets) {
> this.studyPageSets = studyPageSets;
> }
>
> public void addStudyPageSets( StudyPageSet studyPageSet ){
> studyPageSet.setParentStudyHead(this);
> this.studyPageSets.add(studyPageSet);
> }
>
> public void removeStudyPageSet( StudyPageSet studyPageSet ){
> studyPageSet.setParentStudyHead(null);
> this.studyPageSets.remove(studyPageSet);
> }
>
> public int compareTo( Study study ) {
> if ( this.sortOrder < study.getSortOrder() )
> return -1;
> if ( this.sortOrder == study.getSortOrder() )
> return 0;
> else
> return 1;
> }
>
> public boolean equals(Object o) {
> if (!(o instanceof Study))
> return false;
> Study n = (Study)o;
> return n.getName().equals(name) &&
> n.getId().equals(this.getId());
> }
>
> public int hashCode() {
> return 31*name.hashCode();
> }
>
> public String toString() {
> return name;
> }
>
I don't think there's a problem with Serializable. You get a
NullPointerException because name is null when you invoke it's
hashCode() method. Add a check if name is null or use
HashCodeBuilder.reflectionHashCode(this)
--
Ealden Esto E. Escañan
http://ealden.net
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