when running inside a jar the resourcesFile importer doesn't work

[alexisgayte]

to reproduce this issue :

@SpringBootApplication
public class SimulatorApplication {

    public static void main(String[] args) {
        SpringApplication.run(SimulatorApplication.class, args);
    }

}

@AutoConfigureWireMock
@Configuration
public class WiremockConfig {

}

wiremock:
  server:
    files: classpath:/__files
    stubs: classpath:/mappings
    port: 8090

Build the jar and run it.
You should get this :

13:09:55.052 [main] ERROR o.s.boot.SpringApplication - Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.cloud.contract.wiremock.WireMockConfiguration': Invocation of init method failed
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:222)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:422)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1798)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:600)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:337)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:975)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:971)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:625)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:335)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352)
	at SimulatorApplication.main(SimulatorApplication.java:11)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:102)
	at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:64)
	at org.springframework.boot.loader.launch.JarLauncher.main(JarLauncher.java:40)
Caused by: java.nio.file.NoSuchFileException: nested:/xxxx/simulator.jar
	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
	at java.base/sun.nio.fs.UnixFileAttributeViews$Basic.readAttributes(UnixFileAttributeViews.java:55)
	at java.base/sun.nio.fs.UnixFileSystemProvider.readAttributes(UnixFileSystemProvider.java:171)
	at java.base/java.nio.file.Files.readAttributes(Files.java:1853)
	at java.base/java.util.zip.ZipFile$Source.get(ZipFile.java:1445)
	at java.base/java.util.zip.ZipFile$CleanableResource.<init>(ZipFile.java:724)
	at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:251)
	at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:180)
	at java.base/java.util.zip.ZipFile.<init>(ZipFile.java:194)
	at com.github.tomakehurst.wiremock.common.ClasspathFileSource.<init>(ClasspathFileSource.java:67)
	at org.springframework.cloud.contract.wiremock.file.ResourcesFileSource.toSources(ResourcesFileSource.java:65)
	at org.springframework.cloud.contract.wiremock.file.ResourcesFileSource.<init>(ResourcesFileSource.java:52)
	at org.springframework.cloud.contract.wiremock.WireMockConfiguration.registerFiles(WireMockConfiguration.java:247)
	at org.springframework.cloud.contract.wiremock.WireMockConfiguration.init(WireMockConfiguration.java:104)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMethod.invoke(InitDestroyAnnotationBeanPostProcessor.java:457)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:

The issue is that we use fileSource here :
https://github.com/spring-cloud/spring-cloud-contract/blob/main/spring-cloud-contract-wiremock/src/main/java/org/springframework/cloud/contract/wiremock/WireMockConfiguration.java#L246-L249

But we validate classpath here :
https://github.com/spring-cloud/spring-cloud-contract/blob/main/spring-cloud-contract-wiremock/src/main/java/org/springframework/cloud/contract/wiremock/WireMockConfiguration.java#L237-L242

Interestingly if the config is :

wiremock:
  server:
    files: classpath*:/__files
    stubs: classpath:/mappings
    port: 8090

It will works, but this is wrong as the files are inside the jar not a lib.