Enabling/disabling a web.xml filter using a Spring profile

问题

I have a Spring application that can use two different persistence API:

Spring Data JPA
Spring Data Neo4j

When using Spring Data JPA, I need to declare the "OpenEntityManagerInViewFilter" in "web.xml" to do lazy loading:

<filter>
    <filter-name>OpenEntityManagerInViewFilter</filter-name>
    <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>OpenEntityManagerInViewFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

The problem is that I cannot keep this filter enabled when using Spring Data Neo4j. Leaving it enabled leads to the following runtime error:

No qualifying bean of type [javax.persistence.EntityManagerFactory] is defined

I want to choose which database to use with a Spring profile (e.g. spring.profiles.active=relational-database or spring.profiles.active=graph-database).

Question: how can I enable the "OpenEntityManagerInViewFilter" when profile is "relational-database", and disable it when profile is "graph-database"?

Thanks!

回答1:

Ok, I sorted this out. My new "web.xml" uses DelegatingFilterProxy instead of org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter:

<filter>
    <filter-name>toggleOpenEntityManagerInViewFilter</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
    <filter-name>toggleOpenEntityManagerInViewFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

Then in my ApplicationContext, I create a bean named "toggleOpenEntityManagerInViewFilter" (which is the filter-name value). The trick is to instanciate a different class depending on the Spring profile:

<beans profile="graph-database">
    <bean id="toggleOpenEntityManagerInViewFilter" class="my.project.dal.utils.spring.DoNothingFilter"/>
</beans>
<beans profile="relational-database">
    <bean id="toggleOpenEntityManagerInViewFilter" class="org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter"/>
</beans>

The my.project.dal.utils.spring.DoNothingFilter is defined as:

public class DoNothingFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {
    }
}

This seems to work.

来源：https://stackoverflow.com/questions/30800916/enabling-disabling-a-web-xml-filter-using-a-spring-profile

标签

Spring

web.xml

spring-profiles