Issue Found with Spring Auto Reconfiguration with Jackson 2.7.0-RELEASE

[Agraham21]

Hi, I am currently engaged with a customer that has encountered many issues when using Spring Auto Reconfiguration with Jackson. They recently deployed a new release of their application and after the deployment some of their applications throw a incompatible JAR files on the classpath error.

They understand that the class expects a ReferenceTypeSerializer to have a withResolved() method with 5 parameters, which the last parameter is of type JsonInclude.Include but since the release of Jackson 2.9 there is only a withResolved() method with only 4 parameters. Their applications have been using Jackson 2.9.7 for a while without a problem. The customer thought, that maybe the build-pack puts an older version of Jackson on the class path that is incompatible with their Jackson version of 2.9.7. They had then found a new version of Spring Auto Reconfiguration, 2.7.0. This version contains Jackson classes like the ObjectMapper. They also found that these Jackson classes within the 2.7.0 are incompatible with the 2.9.7 release of Jackson, that their applications dependencies uses.

They ended up configuring their own build-pack and changed the spring_auto_reconfiguaration.yml to use version 2.5+ instead of the default 2.+.

[harmenweber]

Here is the original error message and stacktrace:

2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT java.lang.AbstractMethodError: com.fasterxml.jackson.databind.ser.std.ReferenceTypeSerializer.withResolved(Lcom/fasterxml/jackson/databind/BeanProperty;Lcom/fasterxml/jackson/databind/jsontype/TypeSerializer;Lcom/fasterxml/jackson/databind/JsonSerializer;Lcom/fasterxml/jackson/databind/util/NameTransformer;Lcom/fasterxml/jackson/annotation/JsonInclude$Include;)Lcom/fasterxml/jackson/databind/ser/std/ReferenceTypeSerializer;
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.ser.std.ReferenceTypeSerializer.createContextual(ReferenceTypeSerializer.java:167)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.SerializerProvider.handleSecondaryContextualization(SerializerProvider.java:966)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.SerializerProvider.findValueSerializer(SerializerProvider.java:546)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.resolve(BeanSerializerBase.java:332)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.ser.SerializerCache.addAndResolveNonTypedSerializer(SerializerCache.java:174)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1290)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.SerializerProvider.findValueSerializer(SerializerProvider.java:536)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.resolve(BeanSerializerBase.java:332)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.ser.SerializerCache.addAndResolveNonTypedSerializer(SerializerCache.java:197)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1269)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.SerializerProvider.findValueSerializer(SerializerProvider.java:500)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.SerializerProvider.findTypedValueSerializer(SerializerProvider.java:698)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:270)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3697)
2019-03-20T09:06:04.47+0100 [APP/PROC/WEB/0] OUT 	at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3073)

The exception indicates that there are incompatible Jackson JAR files on the classpath. Further, the line numbers in the stacktrace did not match the Jackson 2.9.7 code we're using. That all indicated that there is another version of Jackson on the classpath.

Then, we noticed that auto-reconfiguration-2.7.0-RELEASE.jar contains Jackson classes. These Jackson classes seem to mess up our classpath.