I'm trying to build an instance of start.spring.io to use it in an air-gaped network. I have been working on it for three weeks and still I don't understand well what to do.
I have cloned start.spring.io from GitHub in a host connected to Internet.
There I can build the application without errors:
./mvnw clean install -DskipTests=true
Then if I true to run the application (../mwnw spring-boot:run from the start-site directory), I get the following error when the application starts, I mean is not an error trying to generate a project, and the application dies:
2022-12-19 17:53:21.170 INFO 2701 --- [ restartedMain] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page: class path resource [static/index.html]
2022-12-19 17:53:21.264 WARN 2701 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [io.spring.initializr.web.controller.ProjectGenerationController] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader#5cb0d902]
2022-12-19 17:53:21.272 INFO 2701 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2022-12-19 17:53:21.311 INFO 2701 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-12-19 17:53:21.411 ERROR 2701 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [io.spring.initializr.web.controller.ProjectGenerationController] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader#5cb0d902]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.3.23.jar:5.3.23]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) ~[spring-beans-5.3.23.jar:5.3.23]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.23.jar:5.3.23]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$
...
So, I am not adding any special dependencies or initilializr dependencies other than those already included in the project. I use Java 17 from Bell Soft.
I am not about the Spring Boot version but I haven't modified anything in the project. The pom file in the top directory includes:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.5</version>
</parent>
About my dependencies I am using the initializer-bom:0.20.0-SNAPSHOT. I have also tried with other versions like 0.13.0 and 0.12.0 but the build fails in both cases for the start-site:
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /workspaces/start.spring.io.ori/start-site/src/main/java/io/spring/start/site/extension/dependency/springcloud/SpringCloudContractKotlinDslGradleBuildCustomizer.java:[44,22] cannot find symbol
symbol: method snippets()
location: variable build of type io.spring.initializr.generator.buildsystem.gradle.GradleBuild
[ERROR] /workspaces/start.spring.io.ori/start-site/src/main/java/io/spring/start/site/extension/dependency/graalvm/HibernatePluginGroovyDslGradleBuildCustomizer.java:[39,22] cannot find symbol
symbol: method snippets()
location: variable build of type io.spring.initializr.generator.buildsystem.gradle.GradleBuild
[ERROR] /workspaces/start.spring.io.ori/start-site/src/main/java/io/spring/start/site/extension/dependency/springcloud/SpringCloudContractGroovyDslGradleBuildCustomizer.java:[36,22] cannot find symbol
symbol: method snippets()
location: variable build of type io.spring.initializr.generator.buildsystem.gradle.GradleBuild
[INFO] 3 errors
I wonder if this effort makes sense. If I manage to build the application, will I be able of generating code or does the application connect to somewhere else to retrieve the data required to generate the code?
I would appreciate any hints. Thanks
I will write my (potential) answer here, even though I don't really think that is a real answer but too big to make it as a comment.
My setup:
Amazon Coretto JDK 17 https://docs.aws.amazon.com/corretto/latest/corretto-17-ug/downloads-list.html (it is not JDK 17 from Bell Soft)
Windows 11 Home
So I went to https://github.com/spring-io/start.spring.io and cloned it.
git clone https://github.com/spring-io/start.spring.io.git
Then I went in the root directoy of the cloned project and ran following command:
./mvnw clean install
Here I got some errors while running the tests, but this shouldn't be way too tragic - I think they failed for me, because it tries to run some gradlew commands but they do fail, because I don't have Gradle installed on my PC, as I am always using the Gradle Wrapper.
Then I started the Spring Boot Application.
cd start-site
../mvnw spring-boot:run
The Spring Boot Application started:
022-12-20T15:01:03.510+01:00 INFO 16592 --- [ restartedMain] io.spring.start.site.StartApplication : No active profile set, falling back to 1 default profile: "default"
2022-12-20T15:01:03.573+01:00 INFO 16592 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2022-12-20T15:01:03.573+01:00 INFO 16592 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2022-12-20T15:01:04.800+01:00 INFO 16592 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-12-20T15:01:04.809+01:00 INFO 16592 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-12-20T15:01:04.810+01:00 INFO 16592 --- [ restartedMain] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.1]
2022-12-20T15:01:04.872+01:00 INFO 16592 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-12-20T15:01:04.873+01:00 INFO 16592 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1298 ms
2022-12-20T15:01:05.371+01:00 INFO 16592 --- [ restartedMain] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page: class path resource [static/index.html]
2022-12-20T15:01:05.823+01:00 INFO 16592 --- [ restartedMain] org.ehcache.core.EhcacheManager : Cache 'initializr.metadata' created in EhcacheManager.
2022-12-20T15:01:05.832+01:00 INFO 16592 --- [ restartedMain] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheConfiguration,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=initializr.metadata
2022-12-20T15:01:05.832+01:00 INFO 16592 --- [ restartedMain] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheStatistics,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=initializr.metadata
2022-12-20T15:01:05.835+01:00 INFO 16592 --- [ restartedMain] org.ehcache.core.EhcacheManager : Cache 'initializr.dependency-metadata' created in EhcacheManager.
2022-12-20T15:01:05.836+01:00 INFO 16592 --- [ restartedMain] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheConfiguration,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=initializr.dependency-metadata
2022-12-20T15:01:05.836+01:00 INFO 16592 --- [ restartedMain] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheStatistics,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=initializr.dependency-metadata
2022-12-20T15:01:05.839+01:00 INFO 16592 --- [ restartedMain] org.ehcache.core.EhcacheManager : Cache 'initializr.project-resources' created in EhcacheManager.
2022-12-20T15:01:05.841+01:00 INFO 16592 --- [ restartedMain] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheConfiguration,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=initializr.project-resources
2022-12-20T15:01:05.841+01:00 INFO 16592 --- [ restartedMain] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheStatistics,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=initializr.project-resources
2022-12-20T15:01:05.843+01:00 INFO 16592 --- [ restartedMain] org.ehcache.core.EhcacheManager : Cache 'initializr.templates' created in EhcacheManager.
2022-12-20T15:01:05.843+01:00 INFO 16592 --- [ restartedMain] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheConfiguration,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=initializr.templates
2022-12-20T15:01:05.844+01:00 INFO 16592 --- [ restartedMain] org.ehcache.jsr107.Eh107CacheManager : Registering Ehcache MBean javax.cache:type=CacheStatistics,CacheManager=urn.X-ehcache.jsr107-default-config,Cache=initializr.templates
2022-12-20T15:01:06.026+01:00 INFO 16592 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2022-12-20T15:01:06.031+01:00 INFO 16592 --- [ restartedMain] o.s.b.a.e.web.EndpointLinksResolver : Exposing 2 endpoint(s) beneath base path '/actuator'
2022-12-20T15:01:06.078+01:00 INFO 16592 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-12-20T15:01:06.089+01:00 INFO 16592 --- [ restartedMain] io.spring.start.site.StartApplication : Started StartApplication in 3.056 seconds (process running for 3.444)
2022-12-20T15:01:17.890+01:00 INFO 16592 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-12-20T15:01:17.891+01:00 INFO 16592 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2022-12-20T15:01:17.892+01:00 INFO 16592 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms
2022-12-20T15:01:18.122+01:00 INFO 16592 --- [io-8080-exec-10] .s.SaganInitializrMetadataUpdateStrategy : Fetching Spring Boot metadata from https://spring.io/project_metadata/spring-boot
If I now call http://localhost:8080/ - it works, I didn't do absolutely nothing.
Could it maybe be your JDK? I mean the JDKs are similar but not the same... And you also asked:
I wonder if this effort makes sense. If I manage to build the
application, will I be able of generating code or does the application
connect to somewhere else to retrieve the data required to generate
the code? I would appreciate any hints. Thanks
I personally think, it could make sense but - as soon as I generated a project on my own Spring Initializr, I watched the console of the Spring Boot Application and could see the following log:
Fetching Spring Boot metadata from https://spring.io/project_metadata/spring-boot
So it looks, like this thing actually fetches data from the internet, now I don't know what options you have but I have two in mind.
You could try to fork the GitHub Project and try to remove this network call (if this is really the only one) - I couldn't see anything more in the logs atleast... The actual response of the Call looks pretty simple though:
{"id":"spring-boot","name":"Spring Boot","projectReleases":[{"version":"3.0.1-SNAPSHOT","versionDisplayName":"3.0.1-SNAPSHOT","current":false,"releaseStatus":"SNAPSHOT","snapshot":true},{"version":"3.0.0","versionDisplayName":"3.0.0","current":true,"releaseStatus":"GENERAL_AVAILABILITY","snapshot":false},{"version":"2.7.7-SNAPSHOT","versionDisplayName":"2.7.7-SNAPSHOT","current":false,"releaseStatus":"SNAPSHOT","snapshot":true},{"version":"2.7.6","versionDisplayName":"2.7.6","current":false,"releaseStatus":"GENERAL_AVAILABILITY","snapshot":false},{"version":"2.6.14","versionDisplayName":"2.6.14","current":false,"releaseStatus":"GENERAL_AVAILABILITY","snapshot":false},{"version":"2.5.14","versionDisplayName":"2.5.14","current":false,"releaseStatus":"GENERAL_AVAILABILITY","snapshot":false},{"version":"2.4.13","versionDisplayName":"2.4.13","current":false,"releaseStatus":"GENERAL_AVAILABILITY","snapshot":false}]}
You allow explicitly the URL https://spring.io/project_metadata/spring-boot to fetch data inside of your Air Gap Network (I don't know if this is viable though)
I hope this helps a bit?
There are many dependencies that start from the initializer for spring-boot. If you try to build within an air-gapped network, you will not have access to maven's repository for the dependencies. Try building the package outside the network, and capture the libraries required. Look to your ~/.m2/ folder for the copies of the libraries needed. I would recommend setting up a Nexus repository, and it will capture the libraries as you need them from an open network which you can then use on the air-gapped network.
If this is a secured network, you'll have to have all those files vetted and scanned before you can get them into the air-gapped network. Plan for this.
As you add additional annotations or dependencies, you will have to get them from maven central again. It's not ideal, but you might find someone who setup a project to include all spring-boot dependencies for just this situation.
Also, use the STS dev environment, and build your spring-boot to run with included libraries.
I wrote a simple backend application by spring boot and kotlin, here you can see the full settings https://github.com/lifeodyssey/demo
this bug performed as
I can start and access the application by ./gradlew bootRun
I can start and access the application by java -jar demo.jar
But I could not access the application when I try to start it in a container, even I can see a successful log by docker logs containerID. The log is given below
2022-11-12 15:50:33.017 INFO 1 --- [ main] com.example.demo.DemoApplicationKt : Starting DemoApplicationKt using Java 11.0.16 on eeb1dfe09e6a with PID 1 (/Demo-0.0.1.jar started by root in /)
2022-11-12 15:50:33.029 INFO 1 --- [ main] com.example.demo.DemoApplicationKt : No active profile set, falling back to 1 default profile: "default"
2022-11-12 15:50:34.315 INFO 1 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode
2022-11-12 15:50:34.320 INFO 1 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data MongoDB repositories in DEFAULT mode.
2022-11-12 15:50:34.346 INFO 1 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 15 ms. Found 0 MongoDB repository interfaces.
2022-11-12 15:50:35.564 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8000 (http)
2022-11-12 15:50:35.595 INFO 1 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-11-12 15:50:35.596 INFO 1 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.68]
2022-11-12 15:50:35.787 INFO 1 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-11-12 15:50:35.788 INFO 1 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2628 ms
2022-11-12 15:50:38.155 WARN 1 --- [ main] o.s.b.a.m.MustacheAutoConfiguration : Cannot find template location: classpath:/templates/ (please add some templates, check your Mustache configuration, or set spring.mustache.check-template-location=false)
2022-11-12 15:50:38.346 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8000 (http) with context path ''
2022-11-12 15:50:38.412 INFO 1 --- [ main] com.example.demo.DemoApplicationKt : Started DemoApplicationKt in 6.588 seconds (JVM running for 7.745)
And here is the Dockerfile
FROM openjdk:11
COPY /build/libs/demo-0.0.1-SNAPSHOT.jar Demo-0.0.1.jar
EXPOSE 8000
ENTRYPOINT ["java","-jar","/Demo-0.0.1.jar"]
Here is the commmand I used to build image and run container
docker build -t demo .
docker run -dp 8000:8000 demo:latest
I could not find where is the problem. Can you help me with it ?
Update
Thanks for the comments below, here is what showed when I access localhost
This site can’t be reached localhost refused to connect.
Try:
Checking the connection
Checking the proxy and the firewall
ERR_CONNECTION_REFUSED
I have tried change -dp 8000 to -d -p 8000, but nothing changed.
Try to connect to it using 127.0.0.1:8000 instead of localhost:8000, maybe localhost is not resolving to 127.0.0.1.
If not try a different port and/or browser. Finally your firewall might be blocking your server so check that.
I finally found the issue.
I installed two application two run my docker. One is colima, another is Docker Desktop.
I guess the problem is that docker do not know which one is the "localhost".
This problem fixed after I uninstall docker desktop and link docker to colima.
My Grails 4 application, deployed to GCP appears to be trying to start up after being deployed but never comes up properly. Application requests return a 500 response. There are no errors or clues with DEBUG log level output at the root level.
The same application runs fine locally in development mode.
The production configuration is as per the Grails 3 deployment (to GCP) guide except for the adjustments that were necessary to make it work for Grails 4/Java 11.
Most of the bootstrapping appears to carry out as expected;
Spring Security configures successfully
Spring Security REST configures successfully
Spring beans are registered
Connects to Cloud SQL instance
Database schema is created (by Liquibase)
Plugins are loaded successfully
Then it gets to the following familiar lines of output logging;
INFO --- [main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
INFO --- [main] o.a.coyote.http11.Http11NioProtocol : Initializing ProtocolHandler ["http-nio-8080"]
INFO --- [main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
INFO --- [main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.17]
and restarts..
while normally, the next phase of bootstrapping (happens locally) would be;
[restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
[restartedMain] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 42018 ms
Probably a long shot question but any level of clues or suggestions would be much appreciated.
I've run out of doors to open. :-(
You could try to update Tomcat version just in case.
But looking at Grails documentation:
https://docs.grails.org/latest/guide/upgrading.html
There's some configuration made when you upgrade to Grails 4 from
Grails 3.3.x to prevents the server from restarting when views or
message bundles are changed.
Either modifying a gsp in Grails 4 M2 cause the application to restart.
https://github.com/grails/grails-core/issues/11284
I ran in a weird situation I never had before.
I've got a spring boot application running on intelliJ on ubuntu 18.
My spring boot application runs in a dev environment connected to a h2 in memory database. I have a session based login with spring security.
The weird thing is if after I stopped and restarted the application I am still logged in. And even if I completely restart IntelliJ the session is not cleared. Even the database keeps its state and is not getting dropped.
Only if I restart the whole system everything will be cleared.
Inside my application.properties there are no special properties set.
Everything's on default.
If I stop the application the following console output comes up:
2018-12-22 11:11:19.385 INFO 10000 --- [ Thread-35] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#73abcbfa: startup date [Sat Dec 22 11:11:00 CET 2018]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext#12e6f48a
2018-12-22 11:11:19.391 INFO 10000 --- [ Thread-35] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2018-12-22 11:11:19.391 INFO 10000 --- [ Thread-35] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans
2018-12-22 11:11:19.395 INFO 10000 --- [ Thread-35] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2018-12-22 11:11:19.395 INFO 10000 --- [ Thread-35] .SchemaDropperImpl$DelayedDropActionImpl : HHH000477: Starting delayed drop of schema as part of SessionFactory shut-down'
2018-12-22 11:11:19.415 WARN 10000 --- [ Thread-35] o.s.b.f.support.DisposableBeanAdapter : Invocation of destroy method failed on bean with name 'inMemoryDatabaseShutdownExecutor': org.h2.jdbc.JdbcSQLException:Database is already closed (to disable automatic closing at VM shutdown, add ";DB_CLOSE_ON_EXIT=FALSE" to the db URL) [90121-197]
2018-12-22 11:11:19.417 INFO 10000 --- [ Thread-35] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2018-12-22 11:11:19.419 INFO 10000 --- [ Thread-35] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
Process finished with exit code 130 (interrupted by signal 2: SIGINT)
https://github.com/spring-projects/spring-boot/wiki/spring-boot-1.3.0-m3-release-notes
Update Tomcat, Jetty and Undertow to serialize session data when the
application is stopped and load it again when the application
restarts. Persistent session are opt-in; either by setting
persistentSession on the ConfigurableEmbeddedServletContainer or by
using the property server.session.persistent=true (Persistent sessions
are enabled by default with Devtools).
In spring boot 2, the property is:
server.servlet.session.persistent=false # Whether to persist session data between restarts.
I suppose you are talking about web login via browser (or REST-client). Also I suppose you're using default web security settings.
Then your login request creates a cookie with session id which is returned to browser and is being used in next requests until you close browser.
I've created a new Spring web project using Web and Thymeleaf dependencies,
with Maven and Spring Boot version 2.0.1
But if I try to run it, it doesn't start on localhost port, and shut down itself with the following log messages:
2018-04-17 22:44:30.089 INFO 8904 --- [ main] c.s.s.SpringJokesAppApplication : No active profile set, falling back to default profiles: default
2018-04-17 22:44:31.055 INFO 8904 --- [ main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext#3c72f59f: startup date [Tue Apr 17 22:44:30 CEST 2018]; root of context hierarchy
2018-04-17 22:44:35.418 WARN 8904 --- [ main] ion$DefaultTemplateResolverConfiguration : Cannot find template location: classpath:/templates/ (please add some templates or check your Thymeleaf configuration)
2018-04-17 22:44:35.602 INFO 8904 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-04-17 22:44:35.638 INFO 8904 --- [ main] c.s.s.SpringJokesAppApplication : Started SpringJokesAppApplication in 10.542 seconds (JVM running for 22.976)
2018-04-17 22:44:35.646 INFO 8904 --- [ Thread-25] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext#3c72f59f: startup date [Tue Apr 17 22:44:30 CEST 2018]; root of context hierarchy
2018-04-17 22:44:35.650 INFO 8904 --- [ Thread-25] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
Process finished with exit code 0
It worked when I created another project with Spring Boot version 2.0.0 ,but since then it was upgraded to 2.0.1 it doesn't runs at localhost. I think there is something problem with Tomcat, but I don't know why.
the project works fine, try to delete org.springframwork.boot from .m2 folder
I solved it with deleting the whole .m2\repository folder, then reimport all maven projects. (Maven - update) Thanks for the help!