Spring hangs when loading bean definitions

Question

I have following Java code:

ApplicationContext context = new ClassPathXmlApplicationContext
                ("classpath:applicationContext.xml");

And following application context:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
               http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.1.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">

<mvc:annotation-driven/>
    <context:component-scan base-package="in.ksharma"/>
</beans>

Spring hangs when loading this file. The application does not respond.

To find out why I took a thread dump. It seems to hang inside a TCP connect request:

connectToAddress():213, PlainSocketImpl {java.net}
connect():200, PlainSocketImpl {java.net}
connect():366, SocksSocketImpl {java.net}
connect():529, Socket {java.net}
connect():478, Socket {java.net}
doConnect():163, NetworkClient {sun.net}
openServer():411, HttpClient {sun.net.www.http}
openServer():525, HttpClient {sun.net.www.http}
<init>():208, HttpClient {sun.net.www.http}
New():291, HttpClient {sun.net.www.http}
New():310, HttpClient {sun.net.www.http}
getNewHttpClient():987, HttpURLConnection {sun.net.www.protocol.http}
plainConnect():923, HttpURLConnection {sun.net.www.protocol.http}
connect():841, HttpURLConnection {sun.net.www.protocol.http}
getInputStream():1195, HttpURLConnection {sun.net.www.protocol.http}
setupCurrentEntity():676, XMLEntityManager {com.sun.org.apache.xerces.internal.impl}
startEntity():1314, XMLEntityManager {com.sun.org.apache.xerces.internal.impl}
startDocumentEntity():1266, XMLEntityManager {com.sun.org.apache.xerces.internal.impl}
setInputSource():280, XMLDocumentScannerImpl {com.sun.org.apache.xerces.internal.impl}
parse():409, SchemaParsingConfig {com.sun.org.apache.xerces.internal.impl.xs.opti}
parse():491, SchemaParsingConfig {com.sun.org.apache.xerces.internal.impl.xs.opti}
parse():510, SchemaDOMParser {com.sun.org.apache.xerces.internal.impl.xs.opti}

The address it is trying to connect is:

www.springframework.org/162.159.245.187

What is the problem here?

Answer 1

Check the POM file. Does the schema namespace you have specified in application context correspond to the correct version of Spring dependencies used?

What seems to be happening here is that Spring tries to load the XSD document from the Spring JAR file but is unable to do so due to version mismatch. So it tries to connect to Spring website and load it from there.

Changing the schema namespace to correct version resolved this problem:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">