Demystifying the Top 10 Spring Annotations for 2024

Introduction:

Spring annotations are a powerful tool for autoconfiguring Spring and streamlining the wiring up of components. They serve as metadata that instructs Spring on how to process classes and methods. In this blog post, we'll delve into the top 10 annotations in the Spring framework that every developer should know.

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java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet

INFO: Marking servlet [dad-frontController] as unavailable
Oct 22, 2021 6:31:27 PM org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet [dad-frontController] in web application [/home.com] threw load() exception
java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet

Servlet /webapp threw load() exception or

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet

follow the below steps when you face the above error while running the spring web or spring MVC application on your machine.

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SEVERE: Servlet [Controller] in web application [/myfirst-mvc-project] threw load() exception

I have got the below error while running my First Spring Web MVC application using Tomcat Server.

The error log in the Console is: 

 INFO: Marking servlet [dad-frontController] as unavailable

Sep 30, 2021 10:34:12 PM org.apache.catalina.core.StandardContext loadOnStartup

SEVERE: Servlet [dad-frontController] in web application [/myfirst-mvc-project] threw load() exception

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet

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cvc-id.3: A field of identity constraint 'web-app-servlet-name-uniqueness' matched element 'web-app', but this element does not have a simple type.

 The above error will occur in your web.xml while writing Servlet Code or Spring WebMVC code. 

The Error should be

 cvc-id.3: A field of identity constraint 'web-app-servlet-name-uniqueness' matched element 'web-app', but this element does not have a simple type.

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class path resource [beans.xml] cannot be opened because it does not exist

 

ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");

Caused by: java.io.FileNotFoundException: class path resource [beans.xml] cannot be opened because it does not exist

at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:187)

at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:333)

... 13 more

Solution:

There are two solutions

1. Take the beans.xml out of package and put in default package.

2. Specify package name of the file..

    ClassPathXmlApplicationContext("com/se/io/beans.xml");

 

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Solved: Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBException

when i run my Simple Spring Boot Application i have faced the below exception in the console. 

as

Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBException
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606) ~[na:na]
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168) ~[na:na]
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[na:na]
	... 32 common frames omitted

The JAXB APIs are considered to be Java EE APIs and therefore are no longer contained on the default classpath in Java SE 9. In Java 11, they are completely removed from the JDK. Java 9 introduces the concepts of modules, and by default, the java.se aggregate module is available on the classpath (or rather, module-path). 

As the name implies, the java.se aggregate module does not include the Java EE APIs that have been traditionally bundled with Java 6/7/8. Fortunately, these Java EE APIs that were provided in JDK 6/7/8 are still in the JDK, but they just aren't on the classpath by default. The extra Java EE APIs are provided in the following modules:

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