Unable to integrate Spring Vault in my Web App

I am trying to integrate spring vault as an extra module in my web application. I have created a new service EncryptionService which makes a call to my Spring Vault ApiVaultClient as it is shown bellow :

My Vault configuration VaultConfig.java :

    package com.myproject.encryption;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.URI;
    import java.net.URISyntaxException;
    import java.util.Properties;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.vault.authentication.ClientAuthentication;
    import org.springframework.vault.authentication.TokenAuthentication;
    import org.springframework.vault.client.VaultEndpoint;
    import org.springframework.vault.config.AbstractVaultConfiguration;
    import org.springframework.vault.core.VaultTemplate;

    @Configuration
    public class VaultConfig extends AbstractVaultConfiguration {
    	private Properties props;
    	private String token;
    	private String host;
    	private int port;
    	
    	public VaultConfig() {
    		this.props = new Properties();
    		
    		InputStream vaultConfig = this.getClass().getClassLoader().getResourceAsStream("vault-config.properties");
    
    		if(vaultConfig!=null) {
    			try {
    				props.load(vaultConfig);
    			} catch (IOException ex) {
    				//LOG.error(ex.getMessage());
    			}
    		} else {
    			//LOG.error(new FileNotFoundException("property file vault-config.properties not found in the classpath"));
    		}
    
    		this.token = props.getProperty("vault.token");
    		this.host = props.getProperty("vault.uri");
    	}
    
        @Override
        public ClientAuthentication clientAuthentication() {
            return new TokenAuthentication(this.token);
        }
    
        @Override
        public VaultEndpoint vaultEndpoint() {
        	VaultEndpoint endpoint = null;
    		try {
    			endpoint = VaultEndpoint.from(new URI(this.host));
    		} catch (URISyntaxException ex) {
    			//LOG.error(ex.getMessage());
    		}
        	return endpoint;
        }
        
        /*I added this method hoping that this might solve the bean creation problem of vaultOperations in ApiVaultClient but it didn't work out either*/
        @Bean
        public VaultTemplate getVaultTemplate() {
        	VaultTemplate vaultTemplate = new VaultTemplate(vaultEndpoint(), clientAuthentication());
        	return vaultTemplate;
        }
    
        /**
         * Setters & Getters
         */
        
    	public Properties getProps() {
    		return props;
    	}
    	
    	public void setProps(Properties props) {
    		this.props = props;
    	}
    	
    	public String getToken() {
    		return token;
    	}
    	
    	public void setToken(String token) {
    		this.token = token;
    	}
    	
    	public String getHost() {
    		return host;
    	}
    	
    	public void setHost(String host) {
    		this.host = host;
    	}
    
    	public int getPort() {
    		return port;
    	}
    
    	public void setPort(int port) {
    		this.port = port;
    	}
    }

My REST Client ApiVaultClient.java :

    package com.myproject.encryption;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Properties;
    import javax.annotation.PostConstruct;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    import org.springframework.vault.core.VaultOperations;
    import org.springframework.vault.core.VaultTransitOperations;
    
    @Component("apiVaultClient")
    public class ApiVaultClient{
    	@Autowired
    	private VaultOperations vaultOperations;
    	private VaultTransitOperations transitOperations;
    	private String keyStore;
    	private Properties props;
    	
    	@PostConstruct
    	public void init() {
    		this.transitOperations = vaultOperations.opsForTransit();
    		
    		InputStream vaultConfig = this.getClass().getClassLoader().getResourceAsStream("vault-config.properties");
    		this.props = new Properties();
    		if(vaultConfig!=null) {
    			try {
    				props.load(vaultConfig);
    			} catch (IOException ex) {
    				//LOG.error(ex.getMessage());
    			}
    		} else {
    			//LOG.error(new FileNotFoundException("property file vault-config.properties not found in the classpath"));
    		}
    
    		this.keyStore = props.getProperty("vault.key.store");
    	}
    	
    	public String encrypt(String clearText) {
    		String cipherText = transitOperations.encrypt(this.keyStore, clearText);
    		return cipherText;
    	}
    	
    	public String decrypt(String cipherText) {
    		String clearText = transitOperations.decrypt(this.keyStore, cipherText);
    		return clearText;
    	}
    
    	public String getKeyStore() {
    		return keyStore;
    	}
    
    	public void setKeyStore(String keyStore) {
    		this.keyStore = keyStore;
    	}
    
    	public VaultOperations getVaultOperations() {
    		return vaultOperations;
    	}
    
    	public void setVaultOperations(VaultOperations vaultOperations) {
    		this.vaultOperations = vaultOperations;
    	}
    
    	public VaultTransitOperations getTransitOperations() {
    		return transitOperations;
    	}
    
    	public void setTransitOperations(VaultTransitOperations transitOperations) {
    		this.transitOperations = transitOperations;
    	}
    
    	public Properties getProps() {
    		return props;
    	}
    
    	public void setProps(Properties props) {
    		this.props = props;
    	}
    }

My EncryptionService implementation :

    package com.myproject.business.service.impl;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import com.myproject.business.service.EncryptionService;
    import com.myproject.encryption.ApiVaultClient;
    
    public class EncryptionServiceImpl implements EncryptionService{
    
    	@Autowired
    	private ApiVaultClient apiVaultClient;
    	
    	@Override
    	public String encrypt(String clearText) {
    		return apiVaultClient.encrypt(clearText);
    	}
    
    	@Override
    	public String decrypt(String cipherText) {
    		return apiVaultClient.decrypt(cipherText);
    	}
    
    	public ApiVaultClient getApiVaultClient() {
    		return apiVaultClient;
    	}
    
    	public void setApiVaultClient(ApiVaultClient apiVaultClient) {
    		this.apiVaultClient = apiVaultClient;
    	}
    
    }

My vault-config.properties :

    vault.uri=http://127.0.0.1:8200
    vault.token=s.ty3r7is9tSlXfC4GFMHvwDa5
    vault.key.store=transit/keys/store

My serviceContext.xml which lies in my business module :

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" 
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xmlns:util="http://www.springframework.org/schema/util"
    	xmlns:context="http://www.springframework.org/schema/context"
      	xmlns:aop="http://www.springframework.org/schema/aop"
      	xmlns:tx="http://www.springframework.org/schema/tx"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans
    	http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    	http://www.springframework.org/schema/util
    	http://www.springframework.org/schema/util/spring-util-3.2.xsd
    	http://www.springframework.org/schema/context
    	http://www.springframework.org/schema/context/spring-context-3.2.xsd
    	http://www.springframework.org/schema/tx 
      	http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
      	http://www.springframework.org/schema/aop 
      	http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">
      	
      	<context:component-scan base-package="com.myproject.business.service.impl" />
      	<context:component-scan base-package="com.myproject.encryption" />
    
    	<!-- other services are skipped -->
    
        <bean id="encryptionService" parent="txnProxyTemplate">
    		<property name="target">
    			<bean class="com.myproject.business.service.impl.EncryptionServiceImpl">
    				<property name="apiVaultClient" ref="apiVaultClient" />
    			</bean>
    		</property>
    	</bean>
        </beans>

When starting my application I get the following error :

    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'apiVaultClient': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.vault.core.VaultOperations com.myproject.encryption.ApiVaultClientImpl.vaultOperations; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'vaultTemplate' defined in class path resource [com/myproject/encryption/VaultConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.core.VaultTemplate org.springframework.vault.config.AbstractVaultConfiguration.vaultTemplate()] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'clientHttpRequestFactoryWrapper' defined in class path resource [com/myproject/encryption/VaultConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.config.AbstractVaultConfiguration$ClientFactoryWrapper org.springframework.vault.config.AbstractVaultConfiguration.clientHttpRequestFactoryWrapper()] threw exception; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.springframework.vault.support.SslConfiguration$KeyStoreConfiguration
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:290)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1148)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:636)
    	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:934)
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410)
    	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)
    	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
    	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    	at java.lang.Thread.run(Thread.java:748)
    Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.vault.core.VaultOperations com.myproject.encryption.ApiVaultClientImpl.vaultOperations; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'vaultTemplate' defined in class path resource [com/myproject/encryption/VaultConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.core.VaultTemplate org.springframework.vault.config.AbstractVaultConfiguration.vaultTemplate()] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'clientHttpRequestFactoryWrapper' defined in class path resource [com/myproject/encryption/VaultConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.config.AbstractVaultConfiguration$ClientFactoryWrapper org.springframework.vault.config.AbstractVaultConfiguration.clientHttpRequestFactoryWrapper()] threw exception; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.springframework.vault.support.SslConfiguration$KeyStoreConfiguration
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:518)
    	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:287)
    	... 22 more
    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'vaultTemplate' defined in class path resource [com/myproject/encryption/VaultConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.core.VaultTemplate org.springframework.vault.config.AbstractVaultConfiguration.vaultTemplate()] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'clientHttpRequestFactoryWrapper' defined in class path resource [com/myproject/encryption/VaultConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.config.AbstractVaultConfiguration$ClientFactoryWrapper org.springframework.vault.config.AbstractVaultConfiguration.clientHttpRequestFactoryWrapper()] threw exception; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.springframework.vault.support.SslConfiguration$KeyStoreConfiguration
    	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:603)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1057)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:953)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:921)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:864)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:779)
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:490)
    	... 24 more
    Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.core.VaultTemplate org.springframework.vault.config.AbstractVaultConfiguration.vaultTemplate()] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'clientHttpRequestFactoryWrapper' defined in class path resource [com/myproject/encryption/VaultConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.config.AbstractVaultConfiguration$ClientFactoryWrapper org.springframework.vault.config.AbstractVaultConfiguration.clientHttpRequestFactoryWrapper()] threw exception; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.springframework.vault.support.SslConfiguration$KeyStoreConfiguration
    	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:181)
    	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:592)
    	... 36 more
    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'clientHttpRequestFactoryWrapper' defined in class path resource [com/myproject/encryption/VaultConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.config.AbstractVaultConfiguration$ClientFactoryWrapper org.springframework.vault.config.AbstractVaultConfiguration.clientHttpRequestFactoryWrapper()] threw exception; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.springframework.vault.support.SslConfiguration$KeyStoreConfiguration
    	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:603)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1057)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:953)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191)
    	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:305)
    	at com.myproject.encryption.VaultConfig$$EnhancerBySpringCGLIB$$5cf9316c.clientHttpRequestFactoryWrapper(<generated>)
    	at org.springframework.vault.config.AbstractVaultConfiguration.vaultTemplate(AbstractVaultConfiguration.java:108)
    	at com.myproject.encryption.VaultConfig$$EnhancerBySpringCGLIB$$5cf9316c.CGLIB$vaultTemplate$12(<generated>)
    	at com.myproject.encryption.VaultConfig$$EnhancerBySpringCGLIB$$5cf9316c$$FastClassBySpringCGLIB$$1da77a86.invoke(<generated>)
    	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
    	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:293)
    	at com.myproject.encryption.VaultConfig$$EnhancerBySpringCGLIB$$5cf9316c.vaultTemplate(<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:160)
    	... 37 more
    Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.vault.config.AbstractVaultConfiguration$ClientFactoryWrapper org.springframework.vault.config.AbstractVaultConfiguration.clientHttpRequestFactoryWrapper()] threw exception; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.springframework.vault.support.SslConfiguration$KeyStoreConfiguration
    	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:181)
    	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:592)
    	... 58 more
    Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.springframework.vault.support.SslConfiguration$KeyStoreConfiguration
    	at org.springframework.vault.support.SslConfiguration.unconfigured(SslConfiguration.java:323)
    	at org.springframework.vault.config.AbstractVaultConfiguration.sslConfiguration(AbstractVaultConfiguration.java:225)
    	at org.springframework.vault.config.AbstractVaultConfiguration.clientHttpRequestFactoryWrapper(AbstractVaultConfiguration.java:207)
    	at com.myproject.encryption.VaultConfig$$EnhancerBySpringCGLIB$$5cf9316c.CGLIB$clientHttpRequestFactoryWrapper$13(<generated>)
    	at com.myproject.encryption.VaultConfig$$EnhancerBySpringCGLIB$$5cf9316c$$FastClassBySpringCGLIB$$1da77a86.invoke(<generated>)
    	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
    	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:293)
    	at com.myproject.encryption.VaultConfig$$EnhancerBySpringCGLIB$$5cf9316c.clientHttpRequestFactoryWrapper(<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:160)

I tried to follow what most tutorials propose by the book but in vain. Any help will be more than appreciated.