Fail to start application locally after enabling Spring Security

问题

I am trying to enable spring security to protect my backend services in SDK archetype project based on Spring according to the tutorial https://blogs.sap.com/2017/07/18/step-7-with-sap-s4hana-cloud-sdk-secure-your-application-on-sap-cloud-platform-cloudfoundry/.

After I start the application locally, an error message shows up - "Environment variable VCAP_SERVICES not set". Below is the stack trace of this error.

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.security.oauth2.config.annotation.web.configuration.ResourceServerConfiguration': Unsatisfied dependency expressed through field 'tokenServices'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceServerTokenServices' defined in class path resource [com/bosch/SecurityConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.oauth2.provider.token.ResourceServerTokenServices]: Factory method 'resourceServerTokenServices' threw exception; nested exception is java.lang.IllegalStateException: Environment variable VCAP_SERVICES not set
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$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:846)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
    at com.bosch.Application.main(Application.java:23)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceServerTokenServices' defined in class path resource [com/bosch/SecurityConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.oauth2.provider.token.ResourceServerTokenServices]: Factory method 'resourceServerTokenServices' threw exception; nested exception is java.lang.IllegalStateException: Environment variable VCAP_SERVICES not set
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:625)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:455)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1288)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1127)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:538)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1455)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1419)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveMultipleBeans(DefaultListableBeanFactory.java:1338)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1166)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
    ... 19 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.oauth2.provider.token.ResourceServerTokenServices]: Factory method 'resourceServerTokenServices' threw exception; nested exception is java.lang.IllegalStateException: Environment variable VCAP_SERVICES not set
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:620)
    ... 35 common frames omitted
Caused by: java.lang.IllegalStateException: Environment variable VCAP_SERVICES not set
    at com.sap.xs2.security.commons.SAPVcapServicesParser.parseVcapServices(SAPVcapServicesParser.java:42)
    at com.sap.xs2.security.commons.SAPVcapServicesParser.<init>(SAPVcapServicesParser.java:30)
    at com.sap.xs2.security.commons.SAPPropertyPlaceholderConfigurer.<init>(SAPPropertyPlaceholderConfigurer.java:35)
    at com.sap.xs2.security.commons.SAPOfflineTokenServicesCloud.<init>(SAPOfflineTokenServicesCloud.java:27)
    at com.bosch.SecurityConfig.resourceServerTokenServices(SecurityConfig.java:47)
    at com.bosch.SecurityConfig$$EnhancerBySpringCGLIB$$5e72219b.CGLIB$resourceServerTokenServices$1(<generated>)
    at com.bosch.SecurityConfig$$EnhancerBySpringCGLIB$$5e72219b$$FastClassBySpringCGLIB$$948b0fba.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
    at com.bosch.SecurityConfig$$EnhancerBySpringCGLIB$$5e72219b.resourceServerTokenServices(<generated>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    ... 36 common frames omitted

The steps to reproduce the issue：

Create a fresh sdk archetype project based on Spring
Uncomment out all the code in SecurityConfig.java
Import all the security libraries
Start the application locally

The application is running well on SCP Cloud Foundry.

I know the root cause is the application is going to read Environment variable VCAP_SERVICES when initializing bean in SecurityConfig.java. But it cannot find it in local environment.

Is there any workaround if I want to run application locally?

回答1:

One option, we've used extensively is to use a script locally which sets the VCAP_SERVICES environment variable similar like on Cloud Foundry (cf env ). I assume, this will satisfy the SAPOfflineTokenServicesCloud bean creation.

With that you can start the application locally, but NOT test your web application when the application is secured. Because in this case you need to call the endpoints of your web application with an Authorization header, which needs to contain a "valid" access token. A token is considered to be valid if it is not expired and if it is signed with a private RSA key, which matches the public RSA key, which is provided by the jwks token endpoint of the uaa as documented here: https://docs.cloudfoundry.org/api/uaa/version/74.4.0/index.html#token-keys

You have these options:

For integration testing, you can fetch a fresh access token for your (test) user from the xsuaa service using this endpoint: https://docs.cloudfoundry.org/api/uaa/version/74.4.0/index.html#password-grant. You can use also the java token-client lib.
For local testing (w/o) Xsuaa interaction:
- you need to generate a Jwt token using for example this JwtGenerator and
- change as part of your VCAP_SERVICES environment your verificationkey, which matches to the private key, the token is signed with (e.g. the JwtGenerator's public key), e.g. "verificationkey":"-----BEGIN PUBLIC KEY-----MIIBIjANBgkqhkiG9w0BA...".
For unit testing
- you need to generate a Jwt token using for example this JwtGenerator and
- you need to overwrite your SAPOfflineTokenServicesCloud as done here

This should work (I've never tested that setup in combination with SAP Cloud SDK).

回答2:

Update: I just found out that we had a comparable question with an helpful answer before: How to run downloaded App Router via Service Marketplace

As the security features heavily rely on the bound XSUAA service, as well as the fact that you need to access your application via an AppRouter, there is no easy/recommended way to start a secured application locally.

来源：https://stackoverflow.com/questions/59124764/fail-to-start-application-locally-after-enabling-spring-security

标签

sap-cloud-sdk