org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'testingController' method public java.lang.String com.dreainno.mvc.TestingController.showForm() to { /showForm}: There is already 'helloWorldController' bean method public java.lang.String com.dreainno.mvc.HelloWorldController.showForm() mapped.

Error:-

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'testingController' method 
public java.lang.String com.dreainno.mvc.TestingController.showForm()
to { /showForm}: There is already 'helloWorldController' bean method
public java.lang.String com.dreainno.mvc.HelloWorldController.showForm() mapped.
 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778)
 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
 org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
 org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
 org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
 org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845)
 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
 org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:701)
 org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:667)
 org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:715)
 org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:590)
 org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:529)
 org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:169)
 javax.servlet.GenericServlet.init(GenericServlet.java:158)
 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
 org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
 org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
 org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
 org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
 org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
 java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 java.lang.Thread.run(Unknown Source)

Solution:-

This error will occurred when the same mapping caught by spring controller to more than on method throughtout application.

In This sitution you have to given request mapping to controller and when calling method append controller mapping also.

In simple words you have two methods in different controller and you have the mention controller mapping in url

For example

<form action="hello/processFormVersion3" method="post">

In above example hello is controller request mapping parameter and processFormVersion3 is the methods request mapping

More than one fragment with the name [spring_web] was found. This is not legal with relative ordering. See section 8.2.2 2c of the Servlet specification for details. Consider using absolute ordering.

Error In Spring Application

More than one fragment with the name [spring_web] was found. This is not legal with relative ordering. See section 8.2.2 2c of the Servlet specification for details. Consider using absolute ordering.

Solution:-

Just Keep Only Spring-web-5.1.8 RELEASE.jar in lib folder  and remove Just Keep Only Spring-web-5.1.8 RELEASE-javadoc.jar  Just Keep Only Spring-web-5.1.8 RELEASE.-sources.jar .

This will solve the error in web application. it will occurred because there program will find multiple spring-web.jar in lib folder

Hope Your Error will solve.
Happy Coding

ERROR:-org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type

ERROR:-
Apr 10, 2020 12:56:45 PM org.springframework.context.support.AbstractApplicationContext refresh
WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'tennisCoach': Unsatisfied dependency expressed through field 'fortuneService'; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.dreainno.springdemo.FortuneService' available: expected single matching bean but found 2: happyFortuneService,randomFortuneService
Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'tennisCoach': Unsatisfied dependency expressed through field 'fortuneService'; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.dreainno.springdemo.FortuneService' available: expected single matching bean but found 2: happyFortuneService,randomFortuneService
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
at com.dreainno.springdemo.AnnotaationDemo.main(AnnotaationDemo.java:10)
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.dreainno.springdemo.FortuneService' available: expected single matching bean but found 2: happyFortuneService,randomFortuneService
at org.springframework.beans.factory.config.DependencyDescriptor.resolveNotUnique(DependencyDescriptor.java:221)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1229)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1171)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
... 15 more


Solution:-

When We Use @Autowired and we have multiple implentation of that class simply use the @Qualifier and mention the bean id For Example:-

@Autowired
@Qualifier("happyFortuneService")

private FortuneService fortuneService;

It will solve the error. Thanking You. Happy Coding