#Autowired dependency is null in Groovy class implementing a Groovy interface - spring

Question

I am trying to inject a property class into a Groovy based class, but the injected class is null. I do have another properties class that is being injected into a class that is implementing from Tomcat's Filter interface and that is working fine.
Here is my stacktrace when starting the Spring Boot application:
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'stormpathAccountService' defined in file [/Users/jfitzgerald/Projects/parsezilla-api-partner/build/classes/main/com/schoolzilla/api/application/credentials/StormpathAccountService.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.schoolzilla.api.application.credentials.StormpathAccountService]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1077)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1022)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:706)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:109)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:691)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:952)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:941)
at org.springframework.boot.SpringApplication$run.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)
at com.schoolzilla.api.Application.main(Application.groovy:18)
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.schoolzilla.api.application.credentials.StormpathAccountService]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:164)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:89)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1070)
... 20 more
Caused by: java.lang.NullPointerException
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.createGroovyObjectGetPropertySite(AbstractCallSite.java:254)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.acceptGroovyObjectGetProperty(AbstractCallSite.java:239)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:231)
at com.schoolzilla.api.application.credentials.StormpathAccountService.<init>(StormpathAccountService.groovy:37)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:148)
... 22 more
And here is the code that's giving me issues:
#Service
class StormpathAccountService implements AccountService {
//This is where my problem lies
#Autowired
StormpathProperties stormpathProperties
private def logger = LogFactory.getLog(StormpathAccountService)
private def path = System.getProperty("user.home") + stormpathProperties.apiKeyLocation
//more stuff here...
}
}
Groovy interface being implemented:
interface AccountService {
def createAccount(PartnerAccount account);
def deleteAccount(PartnerAccount account);
ApiKey fetchApiKey(PartnerAccount account);
}
Properties class:
#Configuration
#ConfigurationProperties(prefix = "stormpath")
class StormpathProperties {
String apiKeyLocation
String accountUrl
}
And the property names from my application.properties file:
stormpath.apiKeyLocation
stormpath.accountUrl
And finally my main Application class:
#Configuration
#ComponentScan
#EnableAutoConfiguration
#EnableTransactionManagement
#EnableConfigurationProperties
class Application {
static void main(String[] args) {
SpringApplication.run Application, args
}
}
I've looked through some other suggestions such as implementing a Java based interface instead of a Groovy based interface for classloader reasons, but so far that has not worked for me. I have also tried to change the method of injection to constructor based. The class is successfully injected, but the actual properties are then null.
I've spent a few days banging my head against the keyboard here, so any further help and/or explanation why it's not working would be greatly appreciated.
Edit:
Here is the other service that is using AccountService.groovy:
#Service
#Scope(proxyMode = ScopedProxyMode.TARGET_CLASS)
class PartnerApplicationService {
def logger = LoggerFactory.getLogger(PartnerApplicationService)
#Autowired
PartnerApplicationRepository repository
#Autowired
CredentialsRepository credentialsRepository
#Autowired
PartnerService partnerService
#Autowired
AccountService accountService
//lots more stuff...
}

Answer 1

I think you didn't inject the StormpathAccountService bean into the controller or another classe which uses it, if not try with injecting it:
#Autowired
StormpathAccountService stormpathAccountService;
OR:
inject the AccountService interface in it:
#Autowired
AccountService accountService;

Answer 2

Well, I think I found a solution that works for me. I wound up manually including the StormpathProperties file as part of the #ComponentScan. I have no idea why this needed to be explicit where everything else woks with #ComponentScan correctly.