ahgittin commented on pull request #1172:
URL: https://github.com/apache/brooklyn-server/pull/1172#issuecomment-839159180
now if in a `bean-with-type` you reference a class which isn't
deserializable, instead of the cryptic
```
org.apache.brooklyn.util.exceptions.PropagatedRuntimeException:
brooklyn-bom-yaml bundle installation error: brooklyn-bom-bundle bundle
installation error: Bundle BasicManagedBundle{symbolicName=testSomeArtifact,
version=1, format=brooklyn-bom-bundle, url=null} failed installation: Error
installing catalog items from BOM in testSomeArtifact [176] (with specified BOM
text): Failed to install testSomeArtifact:1, types
[BasicRegisteredType[brooklyn.test.ExecuteSomeArtifact:1;testSomeArtifact:1;bean-with-type]]
gave errors; 3 errors including: Unable to transform definition of
brooklyn.test.ExecuteSomeArtifact; 2 errors including: bean-with-type plan
creation error: JsonMappingException: Cannot find a (Map) Key deserializer for
type [simple type, class org.apache.brooklyn.config.ConfigKey<java.lang.Object>]
at [Source: (String)"{"type":"brooklyn.test.ExecuteSomeArtifact"}"; line:
1, column: 9]
```
you get the significantly more helpful (truly!):
```
org.apache.brooklyn.util.exceptions.PropagatedRuntimeException:
brooklyn-bom-yaml bundle installation error: brooklyn-bom-bundle bundle
installation error: Bundle BasicManagedBundle{symbolicName=testSomeArtifact,
version=1, format=brooklyn-bom-bundle, url=null} failed installation: Error
installing catalog items from BOM in testSomeArtifact [176] (with specified BOM
text): Failed to install testSomeArtifact:1, types
[BasicRegisteredType[brooklyn.test.ExecuteSomeArtifact:1;testSomeArtifact:1;bean-with-type]]
gave errors; 3 errors including: Unable to transform definition of
brooklyn.test.ExecuteSomeArtifact; 2 errors including: bean-with-type plan
creation error: JsonMappingException: Cannot find a (Map) Key deserializer for
type [simple type, class org.apache.brooklyn.config.ConfigKey<java.lang.Object>]
at [Source: (String)"{"type":"brooklyn.test.ExecuteSomeArtifact"}"; line:
1, column: 9], processing class
org.apache.brooklyn.core.location.AbstractLocation$BasicConfigurationSupport,
processing class org.apache.brooklyn.location.ssh.SshMachineLocation,
processing class brooklyn.test.ExecuteSomeArtifact
```
letting us know that the field of type `SshMachineLocation` inside
`ExecuteSomeArtifact` is what is causing the problem
(once we knew that, the solution was easy, mark it transient)
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