hi
i am trying to create a SessionFactory in Hibernate Console. I got following error and session can not be generated





Hibernate 3.1.3
hibernate.properties not found
using CGLIB reflection optimizer
using JDK 1.4 java.sql.Timestamp handling
configuring from resource: /hibernate.cfg.xml
Configuration resource: /hibernate.cfg.xml
Reading mappings from resource: com/oxiput/hibernate/mapping/RvsLov.hbm.xml
Mapping class: com.oxiput.hibernate.mapping.RvsLov -> RVS_LOV
Reading mappings from resource: com/oxiput/hibernate/mapping/RvsUsers.hbm.xml
Mapping class: com.oxiput.hibernate.mapping.RvsUsers -> RVS_USERS
Reading mappings from resource: com/oxiput/hibernate/mapping/RvsUserRole.hbm.xml
Mapping class: com.oxiput.hibernate.mapping.RvsUserRole -> RVS_USER_ROLE
Reading mappings from resource: com/oxiput/hibernate/mapping/RvsCaseReq.hbm.xml
Mapping class: com.oxiput.hibernate.mapping.RvsCaseReq -> RVS_CASE_REQ
Reading mappings from resource: com/oxiput/hibernate/mapping/RvsAttachments.hbm.xml
Mapping class: com.oxiput.hibernate.mapping.RvsAttachments -> RVS_ATTACHMENTS
Reading mappings from resource: com/oxiput/hibernate/mapping/RvsActivity.hbm.xml
Mapping class: com.oxiput.hibernate.mapping.RvsActivity -> RVS_ACTIVITY
Reading mappings from resource: com/oxiput/hibernate/mapping/OxiWebsiteContent.hbm.xml
Mapping class: com.oxiput.hibernate.mapping.OxiWebsiteContent -> OXI_WEBSITE_CONTENT
Reading mappings from resource: com/oxiput/hibernate/mapping/OxiHomeSponsoredLink.hbm.xml
Mapping class: com.oxiput.hibernate.mapping.OxiHomeSponsoredLink -> oxi_home_sponsored_link
Reading mappings from resource: com/oxiput/hibernate/mapping/RvsProduct.hbm.xml
Mapping class: com.oxiput.hibernate.mapping.RvsProduct -> RVS_PRODUCT
Reading mappings from resource: com/oxiput/hibernate/mapping/OxiCareerContent.hbm.xml
Don't use old DTDs, read the Hibernate 3.x Migration Guide!
Mapping class: com.oxiput.hibernate.mapping.OxiCareerContent -> OXI_CAREER_CONTENT
Reading mappings from resource: com/oxiput/hibernate/mapping/RvsPerson.hbm.xml
Don't use old DTDs, read the Hibernate 3.x Migration Guide!
Mapping class: com.oxiput.hibernate.mapping.RvsPerson -> rvs_person
Configured SessionFactory: null
Using Hibernate built-in connection pool (not for production use!)
Hibernate connection pool size: 20
autocommit mode: false
using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://localhost:3306/oxiput
connection properties: {user=root, password=****}
RDBMS: MySQL, version: 5.0.22-community-nt
JDBC driver: MySQL-AB JDBC Driver, version: mysql-connector-java-3.1.12 ( $Date: 2005-11-17 15:53:48 +0100 (Thu, 17 Nov 2005) $, $Revision$ )
Using dialect: org.hibernate.dialect.MySQLDialect
Using default transaction strategy (direct JDBC transactions)
No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
Automatic flush during beforeCompletion(): disabled
Automatic session close at end of transaction: disabled
JDBC batch size: 15
JDBC batch updates for versioned data: disabled
Scrollable result sets: enabled
JDBC3 getGeneratedKeys(): enabled
Connection release mode: auto
Maximum outer join fetch depth: 2
Default batch fetch size: 1
Generate SQL with comments: disabled
Order SQL updates by primary key: disabled
Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
Using ASTQueryTranslatorFactory
Query language substitutions: {}
Second-level cache: enabled
Query cache: disabled
Cache provider: org.hibernate.cache.EhCacheProvider
Optimize cache for minimal puts: disabled
Structured second-level cache entries: disabled
Statistics: disabled
Deleted entity synthetic identifier rollback: disabled
Default entity-mode: pojo
building session factory
No configuration found. Configuring ehcache from ehcache-failsafe.xml found in the classpath: jar:file:/E:/JAVA_DEV/Tomcat%205.5/webapps/Oxiput/WEB-INF/lib/ehcache-1.1.jar!/ehcache-failsafe.xml
%%%% Error Creating SessionFactory %%%%org.hibernate.MappingException: could not instantiate id generator
org.hibernate.MappingException: could not instantiate id generator
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:97)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:152)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:182)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1176)
at com.oxiput.hibernate.SessionManager.currentSession(SessionManager.java:56)
at com.oxiput.dao.RegisterDAO.create(RegisterDAO.java:85)
at com.oxiput.vo.RegisterVO.addPerson(RegisterVO.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:126)
at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
at javax.faces.component.UICommand.broadcast(UICommand.java:312)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:267)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:381)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:75)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsFilter.java:122)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
Caused by: org.hibernate.MappingException: could not interpret id generator strategy:
at org.hibernate.id.IdentifierGeneratorFactory.getIdentifierGeneratorClass(IdentifierGeneratorFactory.java:108)
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:91)
... 36 more
Insert failed.java.lang.NullPointerException

Please check your ID Generator definitions. I found this in your StackTrace: