小编Wil*_*kar的帖子

A ResultSet提供getInt()返回原语的方法int.是否有可能获得Integer允许的物体null？我正在检索的DB字段是可空的,只要字段是,getInt()我0就会返回null.

谢谢

我有一个hashmap:

Map<LotWaferBean, File> hm = new HashMap<LotWaferBean, File>();

LotWaferBean lw = new LotWaferBean();
... //populate lw
if (!hm.containsKey((LotWaferBean) lw)) {
  hm.put(lw, triggerFiles[l]);
}

代码LotWaferBean:

@Override
public boolean equals(Object o) {
        if (!(o instanceof LotWaferBean)) {
              return false;
        }
        if (((LotWaferBean) o).getLotId().equals(lotId)
                    && ((LotWaferBean) o).getWaferNo() == waferNo) {
              return true;
        }
        return false;
  }

在我的IDE中,我将断点放入,equals()但它永远不会被执行.为什么？

我在Tomcat中托管了一个3层appln; 网络,服务和DAO层.

你如何整合Tomcat和Spring？我需要利用Spring的依赖注入,事务管理等.

我只能想到实例化一个ClassPathXmlApplicationContext,但这样,ApplicationContext单例实例在各层之间是不可见的.

提前致谢.

最好的祝福

将

我正在使用嵌入在Tomcat 5.5.26中的OpenEJB 3.1.3,我使用hibernate 3.6作为JPA提供程序.

这是我的persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
             xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
                http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

  <persistence-unit name="manager1" transaction-type="JTA">

    <!-- provider is optional if you work with only 1 JPA provider -->
    <!--
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    -->

    <jta-data-source>java:/DefaultDS</jta-data-source>

<!--
    <properties>
      <property name="hibernate.ejb.cfgfile" value="/hibernate.cfg.xml" />
    </properties>
-->

  </persistence-unit>

</persistence>

这是我的代码:

@Stateless
public class MapSearchManager implements MapSearchLocal, MapSearchRemote {
    @PersistenceContext
    private EntityManager em;
...
    @TransactionAttribute(TransactionAttributeType.REQUIRED)
    public int queryDataSelectionNumRecords(MapSearchParamBean paramBean) {
        Criteria c = createCriteria(paramBean);
        c.setProjection(Projections.rowCount());

        List l = c.list();
...
    }
...
}

当我使用OpenEJB运行tomcat并且我的app war存档时,部署失败,异常堆栈跟踪:

2010-10-27 …

我使用Spring SimpleJDBCTemplate来访问Oracle DB.这是我的代码.

String sql = "SELECT from_bin_code FROM hbin_import_mapping";
return jt.query(sql, new BeanHbinImportMappingMapper(), (Object) null);

行映射器是:

public class BeanHbinImportMappingMapper
    implements
        RowMapper<BeanHbinImportMapping> {
    public BeanHbinImportMapping mapRow(ResultSet rs, int rowno)
        throws SQLException {
        int fromBinCode = rs.getInt("from_bin_code");
//        char fromBinCodeChar = rs.getString("from_bin_code_char").charAt(0);
//        boolean fromBinCodeAllowed = rs.getString("from_bin_code_allowed")
//            .equals("Y") ? true : false;
//        int oliBinCode = rs.getInt("oli_bin_code");
//        String oliBinQuality = rs.getString("oli_bin_quality");
//        String oliBinGroup = rs.getString("oli_bin_group");
//        String oliBinDesc = rs.getString("oli_bin_desc");
//        boolean olibinRef = rs.getString("oli_bin_ref").equals("Y") ? true …

我使用JAXB 2来解析XSD架构的XML文件,并在ants构建到Java类期间自动解组XML标签.有些enums是创造的.代码是:

@XmlType(name = "binQuality")
@XmlEnum
public enum BinQuality {

    GOOD,
    BAD,
    UGLY,
    NULL;

    public String value() {
        return name();
    }

    public static BinQuality fromValue(String v) {
        return valueOf(v);
    }
}

在我的代码中我打电话:

BinQuality bq = BinQuality.valueOf(him.getToBinQuality());

在一个循环中,我只在第91次迭代中获得异常.

*******更新*******

him.getToBinQuality()确实返回有效的枚举(GOOD/BAD/UGLY/NULL).以下是日志的摘录.

....
2011-07-18 15:28:09 DEBUG (com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl:183) -> class com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl|exportToXml|him.getToBin():89|him.getToBinQuality():BAD
2011-07-18 15:28:09 DEBUG (com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl:183) -> class com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl|exportToXml|him.getToBin():90|him.getToBinQuality():UGLY
2011-07-18 15:28:09 DEBUG (com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl:183) -> class com.st.mas.wmr.persistence.process.ProcessStifOliBinConversionCompleteImpl|exportToXml|him.getToBin():91|him.getToBinQuality():BAD 
2011-07-18 15:28:09 WARN  (org.apache.struts.action.RequestProcessor:538) -> Unhandled …