最近在使用Hibernate开发项目，在写好hql语句，并初始化Query对象，执行Query.list()方法时，应用报IllegalArgumentException异常。经网上查询，现已经基本决定原因，是由于在利用hibernate逆向工程生成实体类和映射文件时，数据库字段的numeric类型被逆向成了java实体类中的Doubel类型，然后我觉得这里不应该用包装类，手贱就改成了基本数据类型double，这一改出了问题，数据库中字段的数据类型和java实体类中的属性类型对不上了，出现了IllegalArgumentException异常。解决方法当然是将double类型改回Double类型。我想，如果大家也有这个异常，基本可以断定是由于数据库中的字段的数据类型和java实体类中的属性类型不匹配造成的。

　　现在将我解决问题的过程给大家描述一下：

1：出问题的代码位置：Query.list()方法

  1. public PageModel queryByPage(String where, int start, int limit) {
  2.  
  3.         StringBuffer hql = new StringBuffer("SELECT Object(o) FROM DsImageVideoData AS o WHERE 1=1");
  4.         StringBuffer hql_count = new StringBuffer("SELECT Count(o) FROM DsImageVideoData AS o WHERE 1=1");
  5.  
  6.         Session session = hibernateTemplate.getSessionFactory().openSession();    //获得hibernate session对象
  7.         Query query = session.createQuery(hql.toString());    // 获得对应hql语句的查询对象query
  8.         Query query_count = session.createQuery(hql_count.toString()); // 获得对应hql_count语句的查询对象query
  9.  
  10.         int pageTmp = start;
  11.         int switchPage = (pageTmp - ) * limit;
  12.         query.setFirstResult(switchPage);
  13.         query.setMaxResults();
  14.         PageModel page = new PageModel();
  15.         page.setPageNumber(start);
  16.         page.setObjectsPerPage(limit);
  17.         page.setFullListSize(Integer.valueOf(query_count.list().get().toString()));
  18.         page.setData(query.list());    //query.list()作用是执行查询，出现异常
  19.         return page;
  20.     }

　　以上代码中的page.setData(query.list());出现异常。

2. 异常信息

  1.  严重: Servlet.service() for servlet dispatcher threw exception
  2.  java.lang.IllegalArgumentException
  3.      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  4.      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
  5.      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
  6.      at java.lang.reflect.Method.invoke(Method.java:)
  7.      at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:)
  8.      at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:)
  9.      at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:)
  10.      at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:)
  11.      at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:)
  12.      at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:)
  13.      at org.hibernate.loader.Loader.doQuery(Loader.java:)
  14.      at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:)
  15.      at org.hibernate.loader.Loader.doList(Loader.java:)
  16.      at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:)
  17.      at org.hibernate.loader.Loader.list(Loader.java:)
  18.      at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:)
  19.      at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:)
  20.      at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:)
  21.      at org.hibernate.impl.SessionImpl.list(SessionImpl.java:)
  22.      at org.hibernate.impl.QueryImpl.list(QueryImpl.java:)
  23.      at com.c503.poss.dao.disaster.DsDisasterDamageDaoImpl.queryByPage(DsDisasterDamageDaoImpl.java:)
  24.      at com.c503.poss.service.disaster.DsDisasterDamageServiceImpl.findByCommon(DsDisasterDamageServiceImpl.java:)
  25.      at com.c503.poss.service.disaster.DsDisasterDamageServiceImpl.findDisasterDamage(DsDisasterDamageServiceImpl.java:)
  26.      at com.c503.poss.ctrl.disaster.DsDisasterDamageController.findDisasterDamage(DsDisasterDamageController.java:)
  27.      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  28.      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
  29.      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
  30.      at java.lang.reflect.Method.invoke(Method.java:)
  31.      at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:)
  32.      at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:)
  33.      at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:)
  34.      at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:)
  35.      at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:)
  36.      at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:)
  37.      at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:)
  38.      at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:)
  39.      at javax.servlet.http.HttpServlet.service(HttpServlet.java:)
  40.      at javax.servlet.http.HttpServlet.service(HttpServlet.java:)
  41.      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:)
  42.      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:)
  43.      at com.c503.poss.ctrl.sm.SecurityFilter.doFilter(SecurityFilter.java:)
  44.      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:)
  45.      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:)
  46.      at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:)
  47.      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:)
  48.      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:)
  49.      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:)
  50.      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:)
  51.      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:)
  52.      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:)
  53.      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:)
  54.      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:)
  55.      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:)
  56.      at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:)
  57.      at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:)
  58.      at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:)
  59.      at java.lang.Thread.run(Thread.java:)

3. 数据库相关表字段设计，相关字段为data_size和data_time_length

4. 出问题的实体类为：红色的double字体处出错

  1.  package com.c503.poss.model.disaster;
  2.  
  3.  import java.util.Date;
  4.  
  5.  /**
  6.   * DsImageVideoData entity. @author MyEclipse Persistence Tools
  7.   */
  8.  
  9.  public class DsImageVideoData {
  10.  
  11.      // Fields    
  12.  
  13.       private Integer id;
  14.       private DsTower dsTowerByEndTowerId;
  15.       private DsLine dsLine;
  16.       private DsTower dsTowerByStartTowerId;
  17.       private DsDisaster dsDisaster;
  18.       private String disasterTypeName;
  19.       private String dataKind;
  20.       private String dataName;
  21.       private String storagePath;
  22.       private double dataSize;
  23.       private double dataTimeLength;
  24.       private String dataFormat;
  25.       private String dataType;
  26.       private String phase;
  27.       private Date time;
  28.  
  29.      // Constructors
  30.  
  31.      /** default constructor */
  32.      public DsImageVideoData() {
  33.      }
  34.  
  35.      /** minimal constructor */
  36.      public DsImageVideoData(DsLine dsLine, DsDisaster dsDisaster) {
  37.          this.dsLine = dsLine;
  38.          this.dsDisaster = dsDisaster;
  39.      }
  40.  
  41.      // Property accessors
  42.  
  43.      public Integer getId() {
  44.          return this.id;
  45.      }
  46.  
  47.      public void setId(Integer id) {
  48.          this.id = id;
  49.      }
  50.  
  51.      public DsTower getDsTowerByEndTowerId() {
  52.          return this.dsTowerByEndTowerId;
  53.      }
  54.  
  55.      public void setDsTowerByEndTowerId(DsTower dsTowerByEndTowerId) {
  56.          this.dsTowerByEndTowerId = dsTowerByEndTowerId;
  57.      }
  58.  
  59.      public DsLine getDsLine() {
  60.          return this.dsLine;
  61.      }
  62.  
  63.      public void setDsLine(DsLine dsLine) {
  64.          this.dsLine = dsLine;
  65.      }
  66.  
  67.      public DsTower getDsTowerByStartTowerId() {
  68.          return this.dsTowerByStartTowerId;
  69.      }
  70.  
  71.      public void setDsTowerByStartTowerId(DsTower dsTowerByStartTowerId) {
  72.          this.dsTowerByStartTowerId = dsTowerByStartTowerId;
  73.      }
  74.  
  75.      public DsDisaster getDsDisaster() {
  76.          return this.dsDisaster;
  77.      }
  78.  
  79.      public void setDsDisaster(DsDisaster dsDisaster) {
  80.          this.dsDisaster = dsDisaster;
  81.      }
  82.  
  83.      public String getDisasterTypeName() {
  84.          return this.disasterTypeName;
  85.      }
  86.  
  87.      public void setDisasterTypeName(String disasterTypeName) {
  88.          this.disasterTypeName = disasterTypeName;
  89.      }
  90.  
  91.      public String getDataKind() {
  92.          return this.dataKind;
  93.      }
  94.  
  95.      public void setDataKind(String dataKind) {
  96.          this.dataKind = dataKind;
  97.      }
  98.  
  99.      public String getDataName() {
  100.          return this.dataName;
  101.      }
  102.  
  103.      public void setDataName(String dataName) {
  104.          this.dataName = dataName;
  105.      }
  106.  
  107.      public String getStoragePath() {
  108.          return this.storagePath;
  109.      }
  110.  
  111.      public void setStoragePath(String storagePath) {
  112.          this.storagePath = storagePath;
  113.      }
  114.  
  115.      public double getDataSize() {
  116.          return this.dataSize;
  117.      }
  118.  
  119.      public void setDataSize(double dataSize) {
  120.          this.dataSize = dataSize;
  121.      }
  122.  
  123.      public double getDataTimeLength() {
  124.          return this.dataTimeLength;
  125.      }
  126.  
  127.      public void setDataTimeLength(double dataTimeLength) {
  128.          this.dataTimeLength = dataTimeLength;
  129.      }
  130.  
  131.      public String getDataFormat() {
  132.          return this.dataFormat;
  133.      }
  134.  
  135.      public void setDataFormat(String dataFormat) {
  136.          this.dataFormat = dataFormat;
  137.      }
  138.  
  139.      public String getDataType() {
  140.          return this.dataType;
  141.      }
  142.  
  143.      public void setDataType(String dataType) {
  144.          this.dataType = dataType;
  145.      }
  146.  
  147.      public String getPhase() {
  148.          return this.phase;
  149.      }
  150.  
  151.      public void setPhase(String phase) {
  152.          this.phase = phase;
  153.      }
  154.  
  155.      public Date getTime() {
  156.          return this.time;
  157.      }
  158.  
  159.      public void setTime(Date time) {
  160.          this.time = time;
  161.      }
  162.  }

5. 改进

　　将步骤3中实体类中的属性dataSize和dataTimeLength的数据类型给回Double（包括setter和getter中的方法）

【重要参考】：http://www.cnblogs.com/lucky2u/p/3498046.html

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