Clone of start.spring.io-CodePudding

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

CodePudding user response：

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.

CodePudding user response：

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

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.
1. 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}]}
```
1. 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?