本文介绍了在搭建SSH项目过程中遇到的几个典型错误及其解决方案，包括：javax.persistence.Table.indexes()错误、javax.validation.UnexpectedTypeException、ClassCastException、@Entity导入错误以及Struts2和ANTLR的版本冲突问题。通过错误分析和解决办法，帮助开发者规避这些问题。
1.java.lang.NoSuchMethodError: javax.persistence.Table.indexes()[Ljavax/persistence/Index
pojo类
package com.lxs.test.newstudent.dao.po;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;
@Entity
@Table(name = "student")
public class Student {
@Id@GeneratedValue(generator="custom-id")
@GenericGenerator(name="custom-id", strategy = "assigned")
@Column
private String stuNum;
@Column
private String name;
@Column
private int sex;
@Column
private int age;
public void setStuNum(String stuNum) {
this.stuNum = stuNum;
}
public String getStuNum() {
return stuNum;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public int getSex() {
return sex;
}
public void setSex(int sex) {
this.sex = sex;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [application.xml]: Invocation of init method failed; nested exception is java.lang.NoSuchMethodError: javax.persistence.Table.indexes()[Ljavax/persistence/Index;
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1568)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:540)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:229)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1081)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1006)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:904)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:527)
... 32 more
Caused by: java.lang.NoSuchMethodError: javax.persistence.Table.indexes()[Ljavax/persistence/Index;
at org.hibernate.cfg.annotations.EntityBinder.processComplementaryTableDefinitions(EntityBinder.java:973)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:824)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3845)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3799)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1412)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1846)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1930)
at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.buildSessionFactory(LocalSessionFactoryBuilder.java:372)
at org.springframework.orm.hibernate4.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:453)
at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:438)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1627)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1564)
... 42 more通过对比，我发现在pojo类中如果使用了Table(name="student")，就会报这样的错误，但是如果我写成@Entity(name="student")这样就没问题了，这个可能是Hibernate4.3的一个bug？但是我看到他人的确实也是用Table(name="student")是可以得，当然我也不会轻易就这么妥协的，分析了一下
出现这个错误要么就是javax.persistence包下的Table类没有indexes方法,要么是你jar没导入,要么你jar包冲突了。
于是上网找了一下到底是哪个包冲突了，终于找到答案，javaee.jar中的部分类与hibernate-jpa-2.0-api-1.0.0.Final.jar存在版本冲突，给出的解决办法：找到javaee.jar包所在的位置，用压缩工具打开，删除里面javax目录下的persistence文件夹即可。但是我找到包，发现我引入的j2ee6里面竟然没有javax这个jar包，于是我拷了一个放进里面，想不到错误竟然没有了，而且persistence去除了跟没去除都是正常，这就纳闷了，暂时还没想到到底谁是是非。。。
2.javax.validation.UnexpectedTypeException: No validator could be found for type: java.lang.Integer
POJO类注解属性配置不恰当就会出现这个问题，例如
@NotEmpty 用在集合类上面
@NotBlank 用在String上面
@NotNull 用在基本类型上
3.java.lang.ClassCastException: org.springframework.orm.hibernate4.SessionHolder cannot be cast to org.springframework.orm.hibernate3.SessionHolder
这个错误是可能是因为spring配置的sessionFactory版本和transactionManager的版本没有对应上，比sessionFactory
用的是org.springframework.orm.hibernate3.LocalSessionFactoryBean，而transactionManager用的是org.springframework.orm.hibernate4.HibernateTransactionManager就会出现这种错。
但是我的是因为我在basedao继承了HibernateDaoSupport，而这个类是org.springframework.orm.hibernate3.support.HibernateDaoSupport，跟我使用的sessionFactory版本不一致。
那hibernate4有没有org.springframework.orm.hibernate4.support.HibernateDaoSupport这个类呢？答案是没有，原来
hibernate4.0以上版本的session自己已经封装了 事物的处理，而spring的 hibernateTemplate的事物就和hibernate4的 事物冲突了，然后spring3.1以上的版本索性把hibernateTemplate（也就是HibernateDaoSupport类）去掉了，现在 只能用getcurrensession。
4.org.hibernate.annotations.Entity和javax.persistence.Entity 区别
在@Entity时很容易顺手导入@org.hibernate.annotations.Entity这个包，结果导致了异常。其实应该导入的是@javax.persistence.Entity
Always import @javax.persistence.Entity
@org.hibernate.annotations.Entity是@javax.persistence.Entity的一个补充，但不是后者的替代品
如果import @org.hibernate.annotations.Entity的话，会报异常。
如果想使用@org.hibernate.annotations.Entity所包含的特殊的功能的话，需要在import @javax.persistence.Entity的基础上增加注释，如下：
@Entity
@org.hibernate.annotations.Entity(optimisticLock=OptimisticLockType.ALL)
public class MyEntity implements Serializable {
...
}
5.struts2启动报错com/opensymphony/xwork2/spring/SpringObjectFactory.java:220:-1
Class: com.opensymphony.xwork2.spring.SpringObjectFactory
File: SpringObjectFactory.java
Method: getClassInstance
Line: 220 - com/opensymphony/xwork2/spring/SpringObjectFactory.java:220:-1
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:428)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3838)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4488)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
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 org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.NullPointerException
at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:220) 原因两个：
1.lib中多导入包的大原因：去掉struts2-spring-plugin-2.1.8包即可，因为没有用到spring。
2.还有的原因是用spring了，却没加监听器，在web.xml里面加上
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
5.antlr的jar包版本问题
原因是在几种框架合起来使用的时候，有些jar包会发生冲突。myeclipse中struts2自带的
antlr-2.7.2.jar的版本比较低，hibernate3的这个jar包是antlr-2.7.6.jar，要用高版本的才好使，也就是说要把antlr-2.7.2.jar删去。
6.hibernate映射文件路径错误
spring为我们简化了不少spring的代码，比如我们可以在sessionFactory配置hibernate的映射文件
之前classpath配置路径为cn.edu.cylg.cis.exam.xh127.entity/*.hbm.xml就报了这个错，犯这种错误有时还真是糊里糊涂的
记这里印象深点，避免以后再犯这种错
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