java - JPA AccessType.Property failing to retrieve value from nested classes -

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i'm attempting parse json @entity in order persist data in table. confirmed parsing works have run issue when attempting persist data. in order retrieve needed value in nested classes (two deep) using @access(accesstype.property) annotation on "helper" method.

my best guess entity object being created prior retrieving value nested classes , when attempts retrieve "nested" value class instances null. result unable map value persistence field.

below ascertain important part of exception:

exception description: method [getnestedhref] on object [com.something.dotcom.bleep.parsers.hierarchyv2] triggered exception. internal exception: java.lang.reflect.invocationtargetexception target invocation exception: java.lang.nullpointerexception mapping: org.eclipse.persistence.mappings.directtofieldmapping[nestedhref-->schema.tbl_hierarchy.href] descriptor: relationaldescriptor(com.something.dotcom.bleep.parsers.hierarchyv2 --> [databasetable(schema.tbl_hierarchy)])

below json i'm parsing:

{   "links": {     "self": {       "href": "http:\/\/data.something.com\/v2\/hierarchy\/blah\/id\/blahblah"     }   },   "name": "namevalue",   "id": "idvalue",   "hierarchyid": "hierarchyvalue",   "narrowerterm": [     {       "href": "http:\/\/data.something.com\/v2\/hierarchy\/blah\/id\/somethingelse1",       "sequence": 0     },     {       "href": "http:\/\/data.something.com\/v2\/hierarchy\/blah\/id\/somethingelse2",       "sequence": 1     },     {       "href": "http:\/\/data.something.com\/v2\/hierarchy\/blah\/id\/somethingelse3",       "sequence": 2     }   ] }

i'm having no issue persisting name, id, hierarchy_id, upd , crt dates. able log href using tostring() method. however, cannot seem persist value (see href in links-->self-->href).

@jsonignoreproperties({"href","parentid","recordcreatedate","recordupdatedate"})  @entity //@cache(isolation = cacheisolationtype.isolated) @table(name = "hierarchy_v2", schema = "schema") @access(accesstype.field) public class hierarchyv2{      @id      private string id;     private string name;     @column(name = "hierarchy_id")     private string hierarchyid;     @column(name = "parent_id")     private string parentid;       @temporal(temporaltype.timestamp)     @column(name = "rec_crt_dt")     private date recordcreatedate;     @temporal(temporaltype.timestamp)     @column(name = "rec_upd_dt")     private date recordupdatedate;      @transient     private hierarchylinks links;     @transient     private list<hierarchyterm> broaderterm;     @transient     private list<hierarchyterm> narrowerterm;     //typical getters, setters, overridden methods....      @access(accesstype.property)     @column(name = "href")     protected string getnestedhref(){         return this.links.getself().gethref();     }      protected void setnestedhref(string href){         hierarchylinks links = new hierarchylinks();           this.links = links;         hierarchyv2self hvs = new hierarchyv2self();           this.links.setself(hvs);         hvs.sethref(href);     }  @override public string tostring(){     return this.name + "\t" + this.id + "\t" + this.hierarchyid + "\t" +  this.getnestedhref() + "\t" +  this.parentid; }

following "nested" classes. fooled around @embeddable , @embedded annotations in attempt make work - , without putting thought brain mush. had these classes static inner classes , moved them out of entity class.

i spent 4 hours writing , rewriting , i'm swallowing pride. appreciated.

public class hierarchylinks {     private hierarchyv2self self;     public hierarchyv2self getself() {         return self;     }      public void setself(hierarchyv2self self) {         this.self = self;     }     }  public class hierarchyv2self {     private string href;     public string gethref() {         return href;     }      public void sethref(string href) {         this.href = href;     }   }

your @transient annotation may causing problem here.

@transient private string href;

@transient used indicate perticular field should not persisted in underlying persistance system i.e. database.

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