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I faced the problem that showGraph() in ParseGraph throws a ClassCastException because an int could not be cast to a String. This happens, when an attributeType is an int (instead of Integer). The documentation does not limit AttributeTypes, therefore primitive types are allowed (as well as types like Integer), causing these problems as they cannot be cast to String. I think I could trace back the problem to probably line 171-176: https://code.ipd.kit.edu/weigelt/parse_luna/blob/develop/src/main/java/edu/kit/ipd/parse/luna/graph/ParseGraph.java#L171