javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not insert:

i have a tdd,test for service save the config is

<bean id="dataSource" class="com.chinalbs.framework.datasource.RoutingDataSource">
        <property name="targetDataSources">
            <map key-type="com.chinalbs.framework.datasource.datatype.DataSourceType">
                <!-- -->
                <entry key="OWN" value-ref="own" />
                <entry key="CUST" value-ref="cust" />
                <entry key="SPOT" value-ref="spot" />
            </map>
        </property>
        <property name="defaultTargetDataSource" ref="own" />
    </bean>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource">
            <ref local="dataSource" />
        </property>
    </bean>

    <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="false" />
                <property name="generateDdl" value="true" />
            </bean>
        </property>
        <property name="packagesToScan">
            <list>
                <value>com.chinalbs.entity</value>
            </list>
        </property>
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.dialect">${hibernate.dialect}</prop>
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
                <prop key="hibernate.cache.use_second_level_cache">${hibernate.cache.use_second_level_cache}</prop>
                <prop key="hibernate.cache.region.factory_class">${hibernate.cache.region.factory_class}</prop>
                <prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}</prop>
                <prop key="hibernate.jdbc.fetch_size">${hibernate.jdbc.fetch_size}</prop>
                <prop key="hibernate.jdbc.batch_size">${hibernate.jdbc.batch_size}</prop>
                <prop key="hibernate.connection.isolation">2</prop>
                <prop key="javax.persistence.validation.mode">none</prop>
            </props>
        </property>
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager" />

the entity is

package com.chinalbs.entity;
@Entity
@Table(name="rd_conductor")
public class Conductor implements Serializable{

    private static final long serialVersionUID = -6395187318565034141L;
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private long id;

    @Column(name="sn")
    private String sn="";

    @Column(name="name")
    private String name;

    @Column(name="create_time",nullable=false)
    @Temporal(TemporalType.TIMESTAMP)
    private Date createTime;

and the test is

  @RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:applicationContext.xml" })
@Component
@TransactionConfiguration(defaultRollback = true)
@Transactional
public class TestConductor {

    @Resource(name = "conductorServiceImpl")
    private ConductorService cService;

    @Resource(name = "enterpriseToConductorServiceImpl")
    private EnterpriseToConductorService eToConductorService;

    @Test
    public void testSave() {
        Conductor willedSaved = getConductor();
        cService.save(willedSaved);
        Conductor saved = cService.find(willedSaved.getId());
        Assert.assertEquals(willedSaved, saved);
        cService.delete(saved);
        Conductor notExisted = cService.find(saved.getId());
        Assert.assertNotNull(notExisted);
    }

    private Conductor getConductor() {
        Conductor conductor = new Conductor();
        conductor.setCreateTime(new Date());
        conductor.setName("qqwqw");
        conductor.setSn("asssaaas");
        return conductor;
    }

the service is like that

@Service("conductorServiceImpl")
public class ConductorServiceImpl extends BaseServiceImpl<Conductor, Long>
        implements ConductorService {

    private Logger logger = LoggerFactory.getLogger(getClass());
    @Resource(name = "conductorDaoImpl")
    private ConductorDao conductorDao;

    @Resource(name="enterpriseToConductorServiceImpl")
    private EnterpriseToConductorService eToConductorService;

    @Resource(name="conductorDaoImpl")
    public void setBaseDao(ConductorDao conductorDao){
        super.setBaseDao(conductorDao);
    }

    public void save(Conductor entity) {
        conductorDao.persist(entity);
    }

and the dao is

public abstract class BaseDaoImpl<T, ID extends Serializable> implements BaseDao<T, ID> {

  private Class<T> entityClass;
  private static volatile long aliasCount = 0;

  @PersistenceContext
  protected EntityManager entityManager;

  public void persist(T entity) {
    Assert.notNull(entity);
    entityManager.persist(entity);
  }

the error report like

javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not insert: [com.chinalbs.entity.Conductor] at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1389) at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1317) at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1323) at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:845) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:241) at com.sun.proxy.$Proxy48.persist(Unknown Source) at com.chinalbs.framework.dao.impl.BaseDaoImpl.persist(BaseDaoImpl.java:108) at com.chinalbs.service.impl.ConductorServiceImpl.save(ConductorServiceImpl.java:40) at com.chinalbs.service.impl.ConductorServiceImpl.save(ConductorServiceImpl.java:23) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) at com.sun.proxy.$Proxy52.save(Unknown Source) at com.chinalbs.service.TestConductor.testSave(TestConductor.java:38) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) Caused by: org.hibernate.exception.GenericJDBCException: could not insert: [com.chinalbs.entity.Conductor] at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140) at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:63) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2346) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2853) at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273) at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320) at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129) at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:69) at org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:201) at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:147) at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:71) at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:808) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:782) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:786) at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:839) ... 51 more Caused by: java.sql.SQLException: Field 'create_date' doesn't have a default value at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4187) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4119) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375) at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359) at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:105) at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:93) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:56) ... 66 more

i don't know where is the reason?the table is

CREATE TABLE `rd_conductor` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `create_time` datetime DEFAULT NULL,
  `name` varchar(255) DEFAULT NULL,
  `sn` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

create_time i have configure default null,but the error still exist

how to resolve the problem? thanks for your any help and suggestion!