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

If you add,

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

,it should work ok as it contains the missing class definitions.

Answer 3

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... ):

Answer 4

In my case I delete the .meta file in eclipse workplace then import the project again thereafter it work like a charm. Could not know where the problem exactly. Before delete .meta I add all files from aws-java-sdk-1.11.606\\third-party\\lib