My current project requires a customized "System date", which means a system date and it's format defined in the i18n properties file. But the class dealing with it is a general utility class but not within the web layer. However the locale(to work out the date format) has to be retrieved from a HttpServletRequest object. I am thinking autowire a HttpServletRequest instance to that utility class. It seems break the design pattern but I guess it is piratical. However it doesn't work. So what is wrong with that and is there any better way to solve the Locale in any other layers in Spring?
Thanks in advance.
Wouldn't it be a lot more elegant to simply overload the utility-class to accept a Locale as parameter on the affected methods. Then you can retrieve the locale in your controller and pass it down to the utility.
I prefer you to use the Spring Framework's SessionLocaleResolver. It will change and store the locale in the session and hence you can get that at any point of code in the application.
Please refer the below mentioned configuration for the same. And also read the Spring Documentation for the same for the better understanding.
<mvc:interceptors>
<ref bean="localeChangeInterceptor"/>
</mvc:interceptors>
<bean id="localeChangeInterceptor" class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<property name="paramName" value="lang"/>
</bean>
<bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver">
<property name="defaultLocale" value="en"/>
</bean>
<bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basenames">
<list>
<value>/WEB-INF/i18n/labels</value>
<value>/WEB-INF/i18n/messages</value>
</list>
</property>
<property name="defaultEncoding" value="UTF-8"/>
</bean>
Hope this helps you. Cheers.
Related
I am new to spring.I know that AfterAdvice will cause the after method to execute whether target method completes or exits with exception, but i am not able to find out any example for it.
As AfterAdvice is a marker interface, I don't know which method i need to define in it's implementation class.
Thanks,
You do not have to implement those interfaces directly. Instead, you use either
Use #After annotation to mark the method you want to it to be called.
Use spring xml bean configuration aop:advice to declare an after advice method
However, if you choose to use ProxyFactoryBean
As you indicate that you want to use ProxyFactoryBean, you can declare the xml like this
<bean id="interceptor"
class="yourimplementation">
</bean>
<bean id="setterAdvisor"
class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
<property name="advice">
<ref bean="interceptor"/>
</property>
<property name="patterns">
<list>
<value>.*set.*</value>
</list>
</property>
</bean>
<bean id="person"
class="org.springframework.aop.framework.ProxyFactoryBean">
<property name="proxyInterfaces" value="com.mycompany.Person"/>
<property name="target" ref="personTarget"/>
<property name="interceptorNames">
<list>
<value>setterAdvisor</value>
</list>
</property>
</bean>
For the java implementation, there is no use to implement Advice interface. You should either implement ThrowingAdvice or AfterReturningAdvice. Refer to this for more info.
For more information, you can refer to a couple tutorial guides on Spring AOP and play around with it to get a sense.
I am new on Spring batch so am here to ask some basic advice.
What is the best approach to load a config file in memory (or bean) and use its content while the spring Job/step are running ?
I am not sure but based on some google search I found the below scenario even if I dont quite understand why I should define a writer even if i dont need it :
step1 : load config file (the content is two field delimited by =)
step2 : perform some java code and use the previous config file
so for the step 1 :
<bean id="inputFile" class="org.springframework.core.io.FileSystemResource" scope="step">
<constructor-arg value="path_config_file"/>
</bean>
<bean id="readerConfigFile" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step">
<property name="resource" ref="inputFile"/>
<property name="lineMapper">
<bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<property name="lineTokenizer">
<bean class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">
<property name="names" value="field,value"/>
<property name="delimiter" value="="/>
</bean>
</property>
<property name="fieldSetMapper">
<bean class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper">
<property name="prototypeBeanName" value="configProperties"/>
</bean>
</property>
</bean>
</property>
</bean>
<bean id="outputConfig" class="outputConfig"></bean>
<bean id="configProperties" class="configProperties" scope="prototype"/>
so my question are :
How can I use the information gathered in the file ? Should I put them in the Java bean ?
How can I pas this info between different step or make them persistent in the whole application life-cycle ?
Would you recommend to use a itemProcessor to achieve the above ?
Any advice are most than welcome
I'm a bit confused about your questions because I think you only need to load a properties file in spring context using a PropertiesFactoryBean:
<bean id="config" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="location">
<value>file:path_config_file</value>
</property>
</bean>
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="propertiesArray">
<list>
<ref bean="config"/>
</list>
</property>
</bean>
and you can refer to property values using ${} placeholder; but this solution is unrelated to spring-batch; I don't need it!
About your questions:
Using a POJO is a good way because spring-batch offers in-box mapping strategies (BeanWrapperFieldSetMapper in your case)
Objects used in a job are accessible only in job context, not in application context (this is why I think you need a PropertiesFactoryBean).To pass object between steps read How can we share data between the different steps of a Job in Spring Batch?
ItemProcessor is requested if you need to convert an object T read from a ItemReader<T> to an object of type S written by an ItemWriter<S>. So no, you don't need an ItemProcessor.
I hope I was clear, English is not my native language
Searched through some other posts but could not find exactly what I needed, but I would guess this is an easy question..
So I have a property file called myprops.properties
myprops.localProp1=localProp1
myprops.localProp2=localProp2
myprops.systemProp=${systemPropertyName}
Basically, in this property file I want to use the values as is for localProp1 and locapProp2 but for systemProp, I would like to load the system property. Let's assume that the system property is always set.
My spring config xml looks like this...
<bean id="myprops" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<qualifer value="myprops" />
<property name="singleton" value="true"/>
<property name="ignoreResourceNotFound" value="true" />
<property name="locations">
<list><value>classpath:myprops.properties</value></list>
</property>
</bean>
I use the qualifier have this bean autowired and use the qualifier string "myprops" to access it in another class. All the expected values are there except the myprops.systemProp, it still = ${systemPropertyName}.
How would I get this property to be resolved with the actual system property?
I tried the following in my spring config:
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="properties" ref="myprops" />
<property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
</bean>
This didn't seem to help..
Any ideas? I'm hoping this is an easy one and I am just misunderstanding a common concept in property configuration.
Note: I had to manually type all the code couldn't copy/paste so please excuse typos.
Thanks.
I have a project with spring and hibernate in GWT,
I am using below applicationcontext.xml,
I was just looking for some best approach of making this file
like all the annotated classes below i.e entity.user, entity.secretQuestion and many more , they all get called when my application runs even if i don't need them , which i guess makes my application quite slow,
so is it possible that only the class which i am calling is getting load in applicationcontext.xml and if yes then would it be a better approach as well ?
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.cricsite.persistence.entity.User</value>
<value>com.cricsite.persistence.entity.SecretQuestion</value>
</list>
</property>
</bean>
<bean id ="ManagerAdmin" class= "com.persistence.MySQLRdbHelper">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
You might be looking for something called "lazy loading"
Please take a look at these threads;
Help needed with Spring/Hibernate Lazy-loading
What is lazy loading in Hibernate?
how does spring allow for lazy-loading?
I'm about to extend org.springframework.context.support.AbstractMessageSource that will allow me to dynamically add and edit messages in Spring. I'm planning on storing these values in a database. Is there something out there that does this already? Is there a different approach I should think of?
Here are the requirements:
I have to be able to add messages
I have to be able to edit messages
These adds and edits should take place immediately
Sure.
Develop custom MessageSource and set it as parent to existing (for example based on property files).
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basenames">
<list>
<value>message/messages</value>
</list>
</property>
<property name="parentMessageSource">
<bean class=com.example.DatabaseMessageSource"/>
</property>
</bean>