I imported this project in Eclipse and tried running the MainApplication using the "Run as Java Application" option but, got the following error.

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:: Spring Boot :: (v1.2.3.RELEASE)

15:24:35.125 | main | INFO | c.n.d.MainApplication | Starting MainApplication on JLaptop with PID 7424 (started by Jayasree S in C:\Users\Jayasree S\Downloads\download-server-master\download-server-master)
15:24:35.130 | main | DEBUG | c.n.d.MainApplication | Running with Spring Boot v1.2.3.RELEASE, Spring v4.1.6.RELEASE
15:24:36.615 | main | INFO | o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext | Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@776b83cc: startup date [Wed May 05 15:24:36 SGT 2021]; root of context hierarchy
15:24:37.604 | main | INFO | o.s.b.f.s.DefaultListableBeanFactory | Overriding bean definition for bean 'beanNameViewResolver': replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
15:24:37.720 | main | INFO | o.s.b.l.ClasspathLoggingApplicationListener | Application failed to start with classpath: unknown
15:24:37.725 | main | ERROR | o.s.b.SpringApplication | Application startup failed
java.lang.IllegalStateException: Cannot load configuration class: com.nurkiewicz.download.MainApplication
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:395) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:259) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:265) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:126) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:606) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:462) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at com.nurkiewicz.download.MainApplication.main(MainApplication.java:10) ~[classes/:na]
Caused by: java.lang.ExceptionInInitializerError: null
at org.springframework.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:166) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.cglib.core.KeyFactory$Generator.create(KeyFactory.java:144) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:116) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:108) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:104) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.cglib.proxy.Enhancer.(Enhancer.java:69) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer.newEnhancer(ConfigurationClassEnhancer.java:112) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:100) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:385) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
... 11 common frames omitted
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @15d49048
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357) ~[na:na]
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[na:na]
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199) ~[na:na]
at java.base/java.lang.reflect.Method.setAccessible(Method.java:193) ~[na:na]
at org.springframework.cglib.core.ReflectUtils$2.run(ReflectUtils.java:56) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at java.base/java.security.AccessController.doPrivileged(AccessController.java:312) ~[na:na]
at org.springframework.cglib.core.ReflectUtils.(ReflectUtils.java:46) ~[spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
... 22 common frames omitted
15:24:37.725 | main | INFO | o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext | Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@776b83cc: startup date [Wed May 05 15:24:36 SGT 2021]; root of context hierarchy
15:24:37.726 | main | WARN | o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext | Exception thrown from ApplicationListener handling ContextClosedEvent
java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@776b83cc: startup date [Wed May 05 15:24:36 SGT 2021]; root of context hierarchy
at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:344) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:331) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:869) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.doClose(EmbeddedWebApplicationContext.java:150) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:836) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:342) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at com.nurkiewicz.download.MainApplication.main(MainApplication.java:10) ~[classes/:na]
15:24:37.727 | main | WARN | o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext | Exception thrown from LifecycleProcessor on context close
java.lang.IllegalStateException: LifecycleProcessor not initialized - call 'refresh' before invoking lifecycle methods via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@776b83cc: startup date [Wed May 05 15:24:36 SGT 2021]; root of context hierarchy
at org.springframework.context.support.AbstractApplicationContext.getLifecycleProcessor(AbstractApplicationContext.java:357) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:877) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.doClose(EmbeddedWebApplicationContext.java:150) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:836) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:342) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946) ~[spring-boot-1.2.3.RELEASE.jar:1.2.3.RELEASE]
at com.nurkiewicz.download.MainApplication.main(MainApplication.java:10) ~[classes/:na]
Exception in thread "main" java.lang.IllegalStateException: Cannot load configuration class: com.nurkiewicz.download.MainApplication
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:395)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:259)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:265)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:126)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:606)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:462)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
at com.nurkiewicz.download.MainApplication.main(MainApplication.java:10)
Caused by: java.lang.ExceptionInInitializerError
at org.springframework.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:166)
at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
at org.springframework.cglib.core.KeyFactory$Generator.create(KeyFactory.java:144)
at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:116)
at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:108)
at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:104)
at org.springframework.cglib.proxy.Enhancer.(Enhancer.java:69)
at org.springframework.context.annotation.ConfigurationClassEnhancer.newEnhancer(ConfigurationClassEnhancer.java:112)
at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:100)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:385)
... 11 more
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @15d49048
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
at org.springframework.cglib.core.ReflectUtils$2.run(ReflectUtils.java:56)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:312)
at org.springframework.cglib.core.ReflectUtils.(ReflectUtils.java:46)
... 22 more