· software-development java

jackson-core-asl - java.lang.AbstractMethodError: org.codehaus.jackson.JsonNode.getValueAsText()Ljava/lang/String;

Ian and I were doing a bit of work on an internal application which processes JSON messages and interacts with AWS and we started seeing the following exception after doing an upgrade of jackson-mapper-asl from 1.8.9 to 1.9.13:

2013-09-13 11:01:50 +0000: Exception while handling {MessageId: 7e695fb3-549a-4b
40-b1cf-9dbc5e97a8df, ... }
java.lang.AbstractMethodError: org.codehaus.jackson.JsonNode.getValueAsText()Lja
        at com.amazonaws.services.sqs.AmazonSQSAsyncClient$20.call(AmazonSQSAsyn
        at com.amazonaws.services.sqs.AmazonSQSAsyncClient$20.call(AmazonSQSAsyn
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)   
        at java.util.concurrent.FutureTask.run(FutureTask.java:166)             
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
        at java.lang.Thread.run(Thread.java:724) 

I'd not seen this exception before but we figured that it was probably happening because we had conflicting versions of some Jackson related JAR on the class path.

We could see in the external libraries section of IntelliJ that we had both the 1.8.9 and 1.9.13 versions of jackson-mapper-asl but we weren't sure which dependency was pulling in the earlier version.

Alistair pointed out quite a neat command you can pass to Maven which shows transitive dependencies so we gave that a try:

$ mvn dependency:tree
[INFO] --- maven-dependency-plugin:2.1:tree (default-cli) @ load-generator ---
[INFO] +- com.amazonaws:aws-java-sdk:jar:1.5.6:compile
[INFO] |  +- commons-logging:commons-logging:jar:1.1.1:compile
[INFO] |  +- org.apache.httpcomponents:httpclient:jar:4.2.2:compile (version managed from 4.2)
[INFO] |  +- commons-codec:commons-codec:jar:1.6:compile
[INFO] |  \- org.codehaus.jackson:jackson-core-asl:jar:1.8.9:compile
[INFO] +- org.codehaus.jackson:jackson-mapper-asl:jar:1.9.13:compile
[INFO] |   \- org.codehaus.jackson:jackson-core-asl:jar:1.9.13:compile

As you can see, we have two different versions of the json-core-asl JAR and the earlier version was being pulled in by the aws-java-sdk. We excluded its transitive dependency by changing our pom file to read like this: ~~~xml com.amazonaws aws-java-sdk 1.5.6 org.codehaus.jackson jackson-core-asl ~~~

After that everything worked swimmingly.

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