Unable to test Spring Boot Jersey Rest API using TestRestTemplate Jar Conflict

Question

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
@Import({ JerseyConfig.class })
public class BenchApplicationTest {

@Autowired
private TestRestTemplate restTemplate;

@Test
public void contextLoads() {

    ResponseEntity<String> entity = this.restTemplate.getForEntity("/bench/healthcheck", String.class);
    assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);

  }

}

My application executes perfectly and i am able to test the api using Postman . But when i try the above method to execute the test case to test the API, it gives the following error.

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testRestTemplate': Initialization of bean failed; nested exception is java.lang.NoSuchFieldError: INSTANCE
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:562) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
.....
Caused by: java.lang.NoSuchFieldError: INSTANCE
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.<clinit>(SSLConnectionSocketFactory.java:144) ~[httpclient-4.5.2.jar:4.5.2]
at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:962) ~[httpclient-4.5.2.jar:1.2.2]

I have tried to check the this error and the almost all of them suggest (like this link and link ,) that there are multiple version of a jars(http-client/http-core) in my application. I have checked and i did not find multiple version of SSLConnectionSocketFactory in my application. If at all there are conflicting jars, how can i know which are conflicting. I do not manually add the jar, its a maven project. I am stuck with this problem for the last 1 week and I am now at my wits end.

Please find below my pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2.RELEASE</version>
</parent>
<dependencies>
    <!-- Spring dependencies -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jersey</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-tomcat</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jetty</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-json</artifactId>
        <version>1.18.1</version>
    </dependency>
    <dependency>
        <groupId>org.antlr</groupId>
        <artifactId>antlr-complete</artifactId>
        <version>3.5.2</version>
    </dependency>
    <dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP</artifactId>
    </dependency>
    <dependency>
        <groupId>commons-beanutils</groupId>
        <artifactId>commons-beanutils</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.3.2</version>
    </dependency>
    <dependency>
        <groupId>commons-collections</groupId>
        <artifactId>commons-collections</artifactId>
    </dependency>
    <dependency>
        <groupId>commons-validator</groupId>
        <artifactId>commons-validator</artifactId>
        <version>1.4.1</version>
    </dependency>

    <dependency>
        <groupId>com.sun.jersey.contribs</groupId>
        <artifactId>jersey-multipart</artifactId>
        <version>1.19.3</version>
    </dependency>
    <dependency>
        <groupId>net.sf.json-lib</groupId>
        <artifactId>json-lib</artifactId>
        <version>2.4</version>
    </dependency>
    <dependency>
        <groupId>org.jsoup</groupId>
        <artifactId>jsoup</artifactId>
        <version>1.7.2</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
    </dependency>
    <dependency>
        <groupId>org.antlr</groupId>
        <artifactId>antlr-complete</artifactId>
        <version>3.5.2</version>
    </dependency>
    <dependency>
        <groupId>com.rabbitmq</groupId>
        <artifactId>amqp-client</artifactId>
        <version>2.8.6</version>
    </dependency>
    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-all</artifactId>
        <version>1.9.0</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.oracle</groupId>
        <artifactId>ojdbc6</artifactId>
        <version>11.2.0.4</version>
    </dependency>
    <dependency>
        <groupId>org.owasp.esapi</groupId>
        <artifactId>esapi</artifactId>
        <version>2.1.0</version>
    </dependency>
    <dependency>
        <groupId>com.sun.mail</groupId>
        <artifactId>javax.mail</artifactId>
    </dependency>
    <dependency>
        <groupId>org.freemarker</groupId>
        <artifactId>freemarker</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-jcs-jcache</artifactId>
        <version>2.0-beta-1</version>
    </dependency>
    <dependency>
        <groupId>org.reflections</groupId>
        <artifactId>reflections</artifactId>
        <version>0.9.9</version>
    </dependency>
    <dependency>
        <groupId>com.codahale.metrics</groupId>
        <artifactId>metrics-healthchecks</artifactId>
        <version>3.0.1</version>
    </dependency>
    <dependency>
        <groupId>com.googlecode.json-simple</groupId>
        <artifactId>json-simple</artifactId>
    </dependency>
</dependencies>

Any Help would be appreciated.

Answer 1

Quick answer

Quick check of your pom.xml shows that particular dependency org.owasp.esapi:esapi pulls old 3.1 version of httpclient in. Try adding exclusion section to this dependency as described below. If this does not help, work through dependency tree accordingly

Full answer

Run the following command under your project root folder

mvn dependency:tree -Dincludes=commons-httpclient

That will print your project's maven dependency tree with all pulled transitive dependencies with artifact id commons-httpclient , for example:

[INFO] your:project:jar:1.0-SNAPSHOT
[INFO] \- org.owasp.esapi:esapi:jar:2.1.0:compile
[INFO]    \- org.owasp.antisamy:antisamy:jar:1.4.3:compile
[INFO]       \- commons-httpclient:commons-httpclient:jar:3.1:compile

Than you could determine what is the source of wrong version of httpclient coming in (for our example let it be org.owasp.esapi:esapi ) and then you can exclude that transitive dependency implicitly by amending your pom.xml:

        <dependency>
            <groupId>org.owasp.esapi</groupId>
            <artifactId>esapi</artifactId>
            <version>2.1.0</version>
            <!-- change starts here -->
            <exclusions>
                <exclusion>
                    <groupId>commons-httpclient</groupId>
                    <artifactId>commons-httpclient</artifactId>
                </exclusion>
            </exclusions>
            <!-- change ends here -->
        </dependency>

Note, that you may require to filter dependency tree using wildcards like

mvn dependency:tree -Dincludes=*http*

or even work through plain tree output calling mvn dependency:tree without params

And finally you can end up with explicit adding required dependency to your pom.xml having wrong versions found and excluded as decried above:

<dependency>
  <groupId>org.apache.httpcomponents</groupId>
  <artifactId>httpclient</artifactId>
  <version>4.5.2</version>
</dependency>

Update

As problem is not resolved by above. Handy code piece to determine all the files being loaded from classpath:

ClassLoader cl = ClassLoader.getSystemClassLoader();

URL[] urls = ((URLClassLoader)cl).getURLs();

for(URL url: urls){
    System.out.println(url.getFile());
}

Can you put it into your contextLoads() right before restTemplate call and check/share the console output then?