Rupert Westenthaler created STANBOL-1257:
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Summary: EntityhubDereferenceEngine fails if an empty String is
parsed as dereference field
Key: STANBOL-1257
URL: https://issues.apache.org/jira/browse/STANBOL-1257
Project: Stanbol
Issue Type: Bug
Components: Enhancement Engines
Affects Versions: 0.12.0
Reporter: Rupert Westenthaler
Assignee: Rupert Westenthaler
If [""] is parsed as dereference fields the engine creates a FieldMapper
instance but will not add a single mapping as "" is not valid. As a result the
FieldMapper will reject all fields and therefore causes no data to be
dereferenced wile this config should rather dereference all fields of the
Entity.
The same Issue can be also achieved by parsing any other invalid field mapping,
but an empty configuration is the most likely reason causing this.
To fix this the activation method needs to check if a valid FieldMapping was
parsed and if not do not create a FieldMapper instance.
As a Workaround users should parse ["*"] instead of an empty string.
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