异常及解决办法

1、HHH90000012: Recognized obsolete hibernate namespace

日志：2017-10-19 11:23:55 104 WARN org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver.resolveEntity(LocalXmlResourceResolver.java:75) - HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-mapping. Use namespace http://www.hibernate.org/dtd/hibernate-mapping instead. Support for obsolete DTD/XSD namespaces may be removed at any time.
解决办法：把所有.hbm.xml文件头中的.dtd文件链接修改
http://hibernate.sourceforge.net 修改为 http://www.hibernate.org

修改前
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
修改后
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/hibernate-mapping-3.0.dtd">

2、No qualifying bean of type 'org.springframework.scheduling.TaskScheduler' available

把日志配置修改成INFO

log4j.logger.org.springframework.scheduling = INFO

不改日志配置修改定时配置如下

<!-- 定时任务 -->
<task:scheduler id="scheduler" pool-size="10"/>
<task:annotation-driven scheduler="scheduler"/>

3、java.lang.ClassNotFoundException: javax.servlet.jsp.jstl.core.Config

org.apache.jasper.JasperException: The absolute uri: [http://java.sun.com/jsp/jstl/core] cannot be resolved in either web.xml or the jar files deployed with this application

Java Jsp开发使用jstl标签

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

缺少jstl.jar和standard.jar

4、java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'user' available as request attribute

<sf:form commandName="user">
    username:<sf:input path="username"/>
    password:<sf:input path="password"/>
</sf:form>

form标签commandName设置为user，因此模型中必须要有一个key为user的对象，否则页面无法渲染。所以在controller中给模型追加属性为user的对象

@RequestMapping(value="/register", method=RequestMethod.GET)
public String register(Model model) {
    User user = new User();
    user.setUsername("wohu");
    user.setPassword("wohu");
    model.addAttribute(user);
    return "register";
}

5、org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): city.gaoxin.wzgx.dao.UserMapper.selectLoginUser

mapper的namespace写的不对，自己检查，我就只这个问题

mapper接口方法在xml文件中没有

mapper接口方法返回值和xml文件的返回结果不匹配

6、Eclipse JPA Project Change Event Handler

Neon: [Help > Installation Details > Installed Software]
Oxygen: [Preferences > Install/Update > Installed Software]
仅选择插件"Dali Java Persistence Tools -JPA Support" 点击 "uninstall"等到提示重启eclipse

7、Jackson反序列化异常、org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field

解决方式：给bean类追加注解@JsonIgnoreProperties(ignoreUnknown = true)

8、javax.xml.ws.soap.SOAPFaultException: Cannot create a secure XMLInputFactory

使用cxf开发java web service开发是出异常。

缺少jar包。stax2-api-3.1.4.jar 和 woodstox-core-5.0.3.jar

9、Hibernate启动非常慢问题

hibernate版本不同对dtd文件有影响，把*.hbm.xml文件头dtd地址换掉就好了。

原来的写法

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/hibernate-mapping-3.0.dtd">

修改为

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

就是修改为新地址 http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd 速度就快了

10、Maven警告 Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!

在project下制定编码

  <properties>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

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