Spring consolidation jersey The problem of not injecting service

Phenomenon:

@autowired injection service or DAO failed in action, NULL pointer exception

Reason:

The reason for this problem is that you are not doing a good job of integrating spring and jersey, checking your web.xml files, Jersey configuration is certainly the following,

<servlet>
    <servlet-name>JerseyServlet</servlet-name>
	<servlet-class> com.sun.jersey.spi.container.servlet.servletcontainer</servlet-class>
	<init-param>
		< Param-name>com.sun.jersey.config.property.packages</param-name>
		<param-value>com.demo</ param-value>
	</init-param>
	<load-on-startup>1</load-on-startup>
</ servlet>
<servlet-mapping>
	 <servlet-name>JerseyServlet</servlet-name>
	 < Url-pattern>/rest/*</url-pattern>
</servlet-mapping>

Solutions:

First you need to confirm whether the Jersey-spring.jar jar package has been introduced, and if not, import it first.

Second, change the configuration of the jersey to the following,

<servlet>
        <servlet-name>JerseyServlet</servlet-name>
        <servlet-class> com.sun.jersey.spi.spring.container.servlet.springservlet</servlet-class>
		<init-param>
			<param-name>com.sun.jersey.config.property.packages</param-name>
			<param-value>com.demo </param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
</ servlet>
<servlet-mapping>
        <servlet-name>JerseyServlet</servlet-name>
        < Url-pattern>/rest/*</url-pattern>
</servlet-mapping>

As you may have seen, the difference lies in the Servlet-class class.