Spring Error java.lang.NullPointerException

Question

My Main

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainApp {
public static void main(String[] args) {
    System.out.println("hola");
    ApplicationContext context = new   ClassPathXmlApplicationContext("Beans.xml");
    HelloWorld obj = (HelloWorld) context.getBean("helloWorld");
    obj.getMessage();
}
}

Exception in thread "main" java.lang.ExceptionInInitializerError
at org.springframework.context.support.AbstractRefreshableApplicationContext.createBeanFactory(AbstractRefreshableApplicationContext.java:201)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:127)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:551)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:465)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.tutorialspoint.MainApp.main(MainApp.java:9)



Caused by: java.lang.NullPointerException
          at org.springframework.beans.factory.support.
          DefaultListableBeanFactory.<clinit>(DefaultListableBeanFactory.java:108)
          ... 7 more

Answer 1

The NullPointerException error is at almost impossible location :

static {
    ClassLoader cl = DefaultListableBeanFactory.class.getClassLoader();
    try {
        javaxInjectProviderClass = cl.loadClass("javax.inject.Provider"); /* line 108 */
    } catch (ClassNotFoundException ex) {
        // JSR-330 API not available - Provider interface simply not supported then.
    }
}

This means that the class is not able to get its own classloader . You must have done something really bad to get this error. Check your JRE/JDK, IDE, ...

---

UPDATE

There is no explanation other than that you are probably trying to put Spring JARs into JRE's library folder ( ${java.home}/jre/lib ). If that is the case, that is simply wrong. If you really want to include external JARs within JRE, then put them in the official extension directory - ${java.home}/jre/lib/ext .