spring boot - caused by: java.lang.NoSuchMethodError: org.apache.http.conn.ssl.SSLConnectionSocketFactory

Question

I am using Spring Boot, Spring MVC and Spring Web with HttpClient. While trying to create HttpClient object in @Configuration class I get exception for following code:

SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContext, hostnameVerifier);
    Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
            .register("http", PlainConnectionSocketFactory.getSocketFactory())
            .register("https", sslSocketFactory)
            .build();

POM dependencies

<properties>
  <http.client>4.5.2</http.client>
  <http.core>4.4.4</http.core>
</<properties>
 <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>${http.core}</version>
        </dependency>
<dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>${http.client}</version>
        </dependency>

Exception:

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.http.client.HttpClient]: Factory method 'getHttpClient' thr
ew exception; nested exception is java.lang.NoSuchMethodError: org.apache.http.conn.ssl.SSLConnectionSocketFactory.<init>(Ljavax/net/ssl/SSLContext;Ljavax/net
/ssl/HostnameVerifier;)V                                                                                                                                      
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189)                            
        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)                          
        ... 155 more                                                                                                                                          
Caused by: java.lang.NoSuchMethodError: org.apache.http.conn.ssl.SSLConnectionSocketFactory.<init>(Ljavax/net/ssl/SSLContext;Ljavax/net/ssl/HostnameVerifier;)
V                                                                                                                                                             
        at wsclient.RestClientConfig.getHttpClient(RestClientConfig.java:182)                                                         
        at wsclient.RestClientConfig$$EnhancerBySpringCGLIB$$d3a9da1b.CGLIB$getHttpClient$2(<generated>)                              
        at wsclient.RestClientConfig$$EnhancerBySpringCGLIB$$d3a9da1b$$FastClassBySpringCGLIB$$a56984ae.invoke(<generated>)           
        at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)                                                                      
        at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:309)             
        at wsclient.RestClientConfig$$EnhancerBySpringCGLIB$$d3a9da1b.getHttpClient(<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:497)                                                                                                   
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)                            
        ... 156 more 

Any help or suggestions appreciated

Answer 1

Remove the explicit httpcoredependency (it will be included with httpclient) and do mvn clean install. If the problem persists, show your complete POM as you might have a conflicting version of httpclient installed with something else.