java.lang.NoClassDefFoundError: org/apache/http/conn/SchemePortResolver with AmazonHttpClient

Question

All

I am running into this error in my project when I updated aws library to the latest 1.11.3.

Caused by:

java.lang.NoClassDefFoundError: org/apache/http/conn/SchemePortResolver
at com.amazonaws.http.apache.client.impl.ApacheHttpClientFactory.<init>(ApacheHttpClientFactory.java:40)
at com.amazonaws.http.AmazonHttpClient.<clinit>(AmazonHttpClient.java:97)
at com.amazonaws.AmazonWebServiceClient.<init>(AmazonWebServiceClient.java:145)
at com.amazonaws.services.s3.AmazonS3Client.<init>(AmazonS3Client.java:393)
at com.amazonaws.services.s3.AmazonS3Client.<init>(AmazonS3Client.java:373)
at com.amazonaws.services.s3.AmazonS3Client.<init>(AmazonS3Client.java:355)
at com.amazonaws.services.s3.AmazonS3Client.<init>(AmazonS3Client.java:339)

in my pom.xml

    <dependency>
        <groupId>com.amazonaws</groupId>
        <artifactId>aws-java-sdk-core</artifactId>
        <version>1.11.3</version>
    </dependency>
    <dependency>
        <groupId>com.amazonaws</groupId>
        <artifactId>aws-java-sdk-s3</artifactId>
        <version>1.11.3</version>
    </dependency>
    <dependency>
        <groupId>com.amazonaws</groupId>
        <artifactId>aws-java-sdk-kms</artifactId>
        <version>1.11.3</version>
    </dependency>
    <dependency>
         <groupId>org.bouncycastle</groupId>
          <artifactId>bcprov-ext-jdk15on</artifactId>
         <version>1.54</version>
    </dependency>
    <dependency>
         <groupId>com.amazonaws</groupId>
         <artifactId>aws-encryption-sdk-java</artifactId>
          <version>0.0.1-SNAPSHOT</version>
    </dependency>

Anyone know what I did wrong?

thanks

Answer 1

I had a similar issue with my grails application. In my case the ClassNotFoundException was being thrown from a deploy script. For me the reason SchemePortResolver wasn't being resolved implicitly was because it wasn't required at compile time, it was needed at runtime. Here's what I added to my BuildConfig.groovy to fix it:

runtime 'org.apache.httpcomponents:httpclient:4.5.2' //Required by BeanstalkDeploy.groovy at runtime

Since the OP's question was for Maven, here's the equivalent include:

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

Answer 2

A common cause would be a Maven dependency conflict. In the example below (pom.xml as viewed in Eclipse's Dependency Hierarchy tab), the POM explicitly includes v4.1 of httpclient, which forces Maven to omit the v4.5.5 that aws-java-sdk-core requires (and thus, causes the similar error java.lang.NoClassDefFoundError: org/apache/http/conn/DnsResolver at com.amazonaws.http.apache.client.impl.ApacheHttpClientFactory...):