Review

Detector:	MuDetect_CrossProject
Target:	project ' synthetic ' version mapnull
Misuse:	misuse ' mapnull '
Tags:

Misuse Details

Details about the known misuse from the MUBench dataset.

Description:	Checks the return value of Map.put() to check whether the key was set before. If the Map allows null values, this usage breaks.
Fix Description:	Use Map.containsKey() to check whether a key is set.
Violation Types:	missing/condition/value_or_state
In File:	MapNull.java
In Method:	misuse(Map)
Code with Misuse:	`class MapNull {` `public void misuse(Map<String, Object> m) {` `if (m.put("foo", new Object()) != null) {` `// "foo" was set before` `} else {` `// "foo" was not set before (or set to null!)` `}` `}` `}`

Potential Hits

Findings of the detector that identify an anomaly in the same file and method as the known misuse.

Hit	Rank	Confidence	Confidence String	Pattern Examples	Pattern Support	Pattern Violation	Target Environment Mapping
?	0	0.29166666666667	(pattern support = 7 / 12)(pattern violations = 1 / 1)(overlap = 5.00 / 10.00)	_examples/EMLab/emlab-generation/latest/checkout/emlab-generation/src/main/java/emlab/gen/role/investment/InvestInPowerGenerationTechnologiesWithCO2ForecastRole.java#act(T);_examples/taylorrobert/ProjectM2O/latest/checkout/lib/slick/tools/org/newdawn/slick/tools/hiero/BMFontUtil.java#save(File);_examples/Sankore/Editeur_Sankore---LENUOS-/latest/checkout/sources/lenuos/editor-catalog/src/main/java/com/paraschool/editor/catalog/web/models/ResourceModel.java#ResourceModel(Resource, List, String);_examples/EMLab/emlab-generation/latest/checkout/emlab-generation/src/main/java/emlab/gen/role/investment/InvestInPowerGenerationTechnologiesRole.java#act(T);_examples/EMLab/emlab-generation/latest/checkout/emlab-generation/src/main/java/emlab/gen/role/market/ClearIterativeCO2AndElectricitySpotMarketTwoCountryRole.java#clearIterativeCO2AndElectricitySpotMarketTwoCountryForTimestepAndFuelPrices(DecarbonizationModel, boolean, long, Map, Map, double)	7
?	1	0.29166666666667	(pattern support = 6 / 12)(pattern violations = 1 / 1)(overlap = 7.00 / 12.00)	_examples/Sankore/Editeur_Sankore---LENUOS-/latest/checkout/sources/lenuos/editor/src/com/paraschool/editor/server/exporter/ManifestProjectExporter.java#completeZIP(List, Map, File, ZipArchiveOutputStream);_examples/jenkinsci/envinject-plugin/latest/checkout/src/main/java/org/jenkinsci/plugins/envinject/service/PropertiesVariablesRetriever.java#invoke(File, VirtualChannel);_examples/taylorrobert/ProjectM2O/latest/checkout/lib/slick/tools/org/newdawn/slick/tools/hiero/truetype/TTFSubSetFile.java#scanGlyphs(FontFileReader, Map);_examples/Sankore/Editeur_Sankore---LENUOS-/latest/checkout/sources/lenuos/editor-catalog/src/main/java/com/paraschool/editor/catalog/web/models/ResourceModel.java#ResourceModel(Resource, List, String);_examples/mfazekas/safaridriver/latest/checkout/remote/server/src/java/org/openqa/selenium/remote/server/handler/ExecuteScript.java#apply(Object)	6