java - Spring - AutoWired object NullPointerExpection, Sequence Generator -

we have following error

java.lang.nullpointerexception @ sequence.mysequence.generate(mysequence.java:23) 

my sequence generator

    @component     public class mysequence implements identifiergenerator {      @autowired     sequencedao sequencedao;      public serializable generate(sessionimplementor session, object object)             throws hibernateexception {          <-- sequencedao.getnextvalue -->          return sequencenextvalue;     }     } 

sequencedao

    public interface sequencedao {      long getnextvalue();      } 

sequencedaoimpl

    @repository     @transactional(readonly = false)     public class sequencedaoimpl implements sequencedao {      @autowired     sessionfactory sessionfactory;      @override     @transactional(readonly = true)     public long getnextvalue() {          <-- getnextvalue -->          return nextvalue;     }     } 

config

<context:annotation-config /> <context:component-scan base-package="controller" /> <context:component-scan base-package="dao" /> <context:component-scan base-package="service" /> <context:component-scan base-package="sequence" /> <-- there mysequence 

i don't know i'm doing wrong. rest controller, service, dao work without problems - @autowired works should. here don't know why happens.

all needs sequence generator (oracle database makes id string; therefore can't use generator directly database)

@id @genericgenerator(name="seqid", strategy="sequence.mysequence") @generatedvalue(generator="seqid") @column(name = "id", unique = true, nullable = false, length = 32) public string getid() {     return this.id; } 

any suggestions?

the generator class instanciated hibernate, not managed spring , no injection occurs. have implement directly code sequencedao in method generate() (you receive session in parameters can execute queries) or find mean access spring content through static method , sequencedao it.