Spring Boot application dependency library fails

Question

I have a Spring Boot application ( created in http://start.spring.io -JDK8, Spring Boot 2.6.6 ). I am able to build it and start it.

I added a dependency to the existing library :

<dependency>
    <groupId>com.connect_responsibilitymgr_services</groupId>
    <artifactId>connect-responsibilitymgr-services</artifactId>
    <version>1.0.0</version>
</dependency>

In my implementation I got an instance of the class defined in the dependent library :

ToolkitApi toolkitApi = new ToolkitApi();
UserProfile profile = toolkitApi.getUserProfile("123456");

I am getting a NullPointerException inside the implementation of "getUserProfile":

public UserProfile getUserProfile(String id) throws Exception {
        
        try {
            HttpHeaders headers = new HttpHeaders();            
            headers.set("toolkit-token",
                    CryptoUtils.decrypt(**toolkitConfiguration**.getClientToken(), **toolkitConfiguration**.getEncryptedKey()));

where "toolkitConfiguration" is not instantiated. It's NULL;

In ToolkitApi implementation Bean is being Autowired :

@Controller
public class ToolkitApi {

    private static final Logger log = LoggerFactory.getLogger(ToolkitApi.class);

    @Autowired
    private GISToolConfiguration.ToolkitConfigInfo toolkitConfiguration;

....

@Bean
    @ConfigurationProperties("toolkit")
    ToolkitConfigInfo toolkitConfigInfo() {
        return new ToolkitConfigInfo();
    }

    public static class ToolkitConfigInfo {
        
        private String hostname;
        
        private String port;
        
        private String clientToken;
        
        private String encryptedKey;

all the properties of the ToolkitConfigInfo are defined in "application.properties" and I am able read them. So my "GISToolConfiguration.ToolkitConfigInfo toolkitConfiguration" is never getting instantiated. I am new to Spring Boot and to me it looks like a Bean in dependent library is not getting instantiated for whatever reason. What could be a problem?

Is the Bean ToolkitConfigInfo that you showed the GISToolConfiguration.ToolkitConfigInfo ? — cyberbrain
– cyberbrain, Commented Apr 19, 2022 at 21:02
yes, it's an inner class : public class GISToolConfiguration { ... @Bean @ConfigurationProperties("toolkit") ToolkitConfigInfo toolkitConfigInfo() { return new ToolkitConfigInfo(); } public static class ToolkitConfigInfo { private String hostname; private String port; private String clientToken; private String encryptedKey; — vs777
– vs777, Commented Apr 20, 2022 at 13:48

cyberbrain · Accepted Answer · 2022-04-20 15:31:42Z

1

You are instantiating your toolkitApi with new:

ToolkitApi toolkitApi = new ToolkitApi();

There Spring DI cannot inject the toolkitConfiguration. Let Spring inject you that toolkitApi where you use it.

answered Apr 20, 2022 at 15:31

cyberbrain

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3 Comments

vs777 Over a year ago

It looks like it's the right way to do it. I am trying to inject it but getting compilation Error : Could not autowire, "No beans of 'ToolkitApi' type found. I am doing it in my main Application class. I think it's a problem.

vs777 Over a year ago

I added @ComponentScan(<path-toToolkitApi-package>) and it started to initialize it. This is definitely the right way to do it. Thanks a million!

cyberbrain Over a year ago

you're welcome. Don't forget to upvote the answer and accept it if it was helpful to you, please :)

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