Problem: type conversion is required when injecting properties of time date (Java. Util. Date) type in spring, because spring cannot directly inject date type. I learned the version of spring 2.5 when I was learning spring, but today I changed all the packages of spring to spring 4.2. I found the previous mistakes.
The specific error information is as follows:
log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'customEditorConfigurer' defined in file [E:\Workspaces\MyEclipse 10\spring_utildate\bin\applicationContext-beans.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type [java.util.LinkedHashMap] to required type [java.util.Map] for property 'customEditors'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [com.zm.bean.UtilDatePropertyEditor] to required type [java.lang.Class] for property 'customEditors[java.util.Date]': PropertyEditor [org.springframework.beans.propertyeditors.ClassEditor] returned inappropriate value of type [com.zm.bean.UtilDatePropertyEditor]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:171)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:678)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:520)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.zm.test.Test.main(Test.java:11)
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type [java.util.LinkedHashMap] to required type [java.util.Map] for property 'customEditors'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [com.zm.bean.UtilDatePropertyEditor] to required type [java.lang.Class] for property 'customEditors[java.util.Date]': PropertyEditor [org.springframework.beans.propertyeditors.ClassEditor] returned inappropriate value of type [com.zm.bean.UtilDatePropertyEditor]
at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:596)
at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:603)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:204)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1527)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1486)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
... 11 more
Caused by: java.lang.IllegalArgumentException: Cannot convert value of type [com.zm.bean.UtilDatePropertyEditor] to required type [java.lang.Class] for property 'customEditors[java.util.Date]': PropertyEditor [org.springframework.beans.propertyeditors.ClassEditor] returned inappropriate value of type [com.zm.bean.UtilDatePropertyEditor]
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:298)
at org.springframework.beans.TypeConverterDelegate.convertToTypedMap(TypeConverterDelegate.java:655)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:222)
at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:576)
... 17 more
After checking the log, you will be prompted that the custom editor type does not match the required type. Since the previous code has not changed, only the package of spring 2.0 has been replaced by the package of spring 4.0, so it should not be a code problem. Only because of the new features of spring 4.0. So began to trace the source code, and finally found the "amazing power"...
Configuration of spring 2.0
Class bean:
package com.zm.bean;
import java.util.Date;
public class Bean1 {
private Date dateValue;
public Date getDateValue() {
return dateValue;
}
public void setDateValue(Date dateValue) {
this.dateValue = dateValue;
}
}
Custom property editor class:
package com.zm.bean;
import java.beans.PropertyEditorSupport;
import java.text.SimpleDateFormat;
import java.text.ParseException;
import java.util.Date;
public class UtilDatePropertyEditor extends PropertyEditorSupport {
private String format="yyyy-MM-dd";
@Override
public void setAsText(String text) throws IllegalArgumentException {
// TODO Auto-generated method stub
System.out.println("UtilDatePropertyEditor.setAsText() -- text=" + text);
SimpleDateFormat sdf = new SimpleDateFormat(format);
Try{
Date d = sdf.parse(text);
this.setValue(d);
}catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void setFormat(String format) {
this.format = format;
}
}
Related configuration:
< span style = "white space: pre" >
<bean id="bean1" class="com.zm.bean.Bean1">
<property name="dateValue" value="2016-08-20"/>
</bean>
<! -- configure custom attribute editor -- >
<bean id="customEditorConfigurer" class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors">
<map>
<entry key="java.util.Date" >
<bean class="com.zm.bean.UtilDatePropertyEditor">
<property name="format" value="yyyy-MM-dd"/>
</bean>
</entry>
</map>
</property>
</bean>
Configuration of spring 4.0
Related configuration:
< span style = "white space: pre" >
<bean id="bean1" class="com.zm.bean.Bean1">
<property name="dateValue" value="2016-08-20"/>
</bean>
<! -- configure custom attribute editor -- >
<bean id="customEditorConfigurer" class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors">
<map>
<entry key="java.util.Date" value="com.zm.bean.UtilDatePropertyEditor"/>
</map>
</property>
</bean>
Compared with the above configuration, the only difference is that when configuring the customeditors attribute, the value of < entry > configured in spring 2.0 is a < bean > while the value of < entry > configured in spring 4.0 is a class name.
Looking at the source code, you can find the type of customeditors. In spring2.0, the type of the key and value is uncertain. But when processing at the bottom, the type of the key must be class, and value is an injected bean. In spring4.0, the type of customeditors changes to map < class <? >, Class <? Extends property editor > > that is, the type of key and value has been determined as class type.
————————————————
Copyright notice: This is the original article of the CSDN blogger "hofighter", following the CC 4.0 by-sa copyright agreement. Please attach the original source link and this notice for reprint.
Original link: https://blog.csdn.net/xinyoulin/article/details/52315810
