Error noClassDefFoundError

[gcornacchia]

when launching mvn clean package command on latest version several tests fail with this exception:

java.lang.NoClassDefFoundError: com/vordel/common/SystemProperty

[ERROR] Tests run: 24, Failures: 4, Errors: 0, Skipped: 0, Time elapsed: 6.675 s <<< FAILURE! - in TestSuite
[ERROR] invalidGetRequestPetsByStatusWithoutQueryParam(com.axway.apim.openapi.validator.TestOpenAPIValidator) Time elapsed: 0.008 s <<< FAILURE!
java.lang.NoClassDefFoundError: com/vordel/common/SystemProperty
at com.axway.apim.openapi.validator.TestOpenAPIValidator.invalidGetRequestPetsByStatusWithoutQueryParam(TestOpenAPIValidator.java:96)
Caused by: java.lang.ClassNotFoundException: com.vordel.common.SystemProperty
at com.axway.apim.openapi.validator.TestOpenAPIValidator.invalidGetRequestPetsByStatusWithoutQueryParam(TestOpenAPIValidator.java:96)

[ERROR] isValidRequestFalseTest(com.axway.apim.openapi.validator.TestOpenAPIValidator) Time elapsed: 0.01 s <<< FAILURE!
java.lang.AssertionError: expected [false] but found [true]
at com.axway.apim.openapi.validator.TestOpenAPIValidator.isValidRequestFalseTest(TestOpenAPIValidator.java:55)

[ERROR] testSpecialCharsQueryParam(com.axway.apim.openapi.validator.TestOpenAPIValidator) Time elapsed: 0.003 s <<< FAILURE!
java.lang.NoClassDefFoundError: com/vordel/common/SystemProperty
at com.axway.apim.openapi.validator.TestOpenAPIValidator.testSpecialCharsQueryParam(TestOpenAPIValidator.java:261)

[ERROR] validGetRequestPetsByStatusPetstoreSwagger20(com.axway.apim.openapi.validator.TestOpenAPIValidator) Time elapsed: 0.002 s <<< FAILURE!
java.lang.NoClassDefFoundError: com/vordel/common/SystemProperty
at com.axway.apim.openapi.validator.TestOpenAPIValidator.validGetRequestPetsByStatusPetstoreSwagger20(TestOpenAPIValidator.java:80)

[INFO]
[INFO] Results:
[INFO]
[ERROR] Failures:
[ERROR] TestOpenAPIValidator.invalidGetRequestPetsByStatusWithoutQueryParam:96 » NoClassDefFound
[ERROR] TestOpenAPIValidator.isValidRequestFalseTest:55 expected [false] but found [true]
[ERROR] TestOpenAPIValidator.testSpecialCharsQueryParam:261 » NoClassDefFound com/vord...
[ERROR] TestOpenAPIValidator.validGetRequestPetsByStatusPetstoreSwagger20:80 » NoClassDefFound
[INFO]
[ERROR] Tests run: 24, Failures: 4, Errors: 0, Skipped: 0

is there a missing Axway Dependency?