Review

Detector:	MuDetectRankComp_180222_ExcludeInstances
Target:	project ' aclang ' version 587
Misuse:	misuse ' 2 '
Tags:

Misuse Details

Details about the known misuse from the MUBench dataset.

Description:	StrBuilder.getNullText() may return null.
Fix Description:	Check for null before using. (see diff)
Violation Types:	missing/condition/null_check
In File:	org/apache/commons/lang/text/StrBuilder.java
In Method:	appendFixedWidthPadRight(Object, int, char)
Code with Misuse:	class StrBuilder { /** * Appends an object to the builder padding on the right to a fixed length. * The <code>toString</code> of the object is used. * If the object is larger than the length, the right hand side is lost. * If the object is null, null text value is used. * * @param obj the object to append, null uses null text * @param width the fixed field width, zero or negative has no effect * @param padChar the pad character to use * @return this, to enable chaining */ public StrBuilder appendFixedWidthPadRight(Object obj, int width, char padChar) { if (width > 0) { ensureCapacity(size + width); String str = (obj == null ? getNullText() : obj.toString()); int strLen = str.length(); if (strLen >= width) { str.getChars(0, width, buffer, size); } else { int padLen = width - strLen; str.getChars(0, strLen, buffer, size); for (int i = 0; i < padLen; i++) { buffer[size + strLen + i] = padChar; } } size += width; } return this; } }

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

Strategy	Rank	Desc
	75	()
Confidence	-	filtered
DefectIndicator	-	filtered
O-E2MN	-	filtered
O-E2MN*PS	-	filtered
O-E2MNPSPU	-	filtered
O-E2MNPSPV	-	filtered
O-E2MNPSPV*PU	-	filtered
O-E2MNPSPV*VS	-	filtered
O-E2MNPSPVVSPU	-	filtered
O-E2MNPSVS	-	filtered
O-E2MNPSVS*PU	-	filtered
O-E2MN*PU	-	filtered
O-E2MN*PV	-	filtered
O-E2MNPVPU	-	filtered
O-E2MNPVVS	-	filtered
O-E2MNPVVS*PU	-	filtered
O-E2MN*VS	-	filtered
O-E2MNVSPU	-	filtered
PS	-	filtered
PS*PU	-	filtered
PS*PV	-	filtered
PSPVPU	-	filtered
PSPVVS	-	filtered
PSPVVS*PU	-	filtered
PS*VS	-	filtered
PSVSPU	-	filtered
PU	224	(1 / 1614 (String))
PV	342	(pattern violations = 1 / 281)
PV*PU	342	(pattern violations = 1 / 281)*(1 / 1614 (String))
PV*VS	-	filtered
PVVSPU	-	filtered
Rareness	-	filtered
VS	-	filtered
VS*PU	-	filtered

aclang/587/build/src/java/org/apache/commons/lang/StringEscapeUtils.java#unescapeCsv(Writer, String)
aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#splitWorker(String, char, boolean)
aclang/587/build/src/java/org/apache/commons/lang/ClassUtils.java#getShortClassName(String)
aclang/587/build/src/java/org/apache/commons/lang/WordUtils.java#abbreviate(String, int, int, String)
aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#splitWorker(String, String, int, boolean)

Strategy	Rank	Desc
	-	filtered
Confidence	240	19 / (19 + 291)
DefectIndicator	358	(1 / 1614 (String)) * 19 / 33
O-E2MN	285	(overlap = 9.00 / 12.00)
O-E2MN*PS	132	(overlap = 9.00 / 12.00)*(pattern support = 19 / 20)
O-E2MNPSPU	323	(overlap = 9.00 / 12.00)(pattern support = 19 / 20)(1 / 1614 (String))
O-E2MNPSPV	348	(overlap = 9.00 / 12.00)(pattern support = 19 / 20)(pattern violations = 1 / 291)
O-E2MNPSPV*PU	461	(overlap = 9.00 / 12.00)(pattern support = 19 / 20)(pattern violations = 1 / 291)*(1 / 1614 (String))
O-E2MNPSPV*VS	376	(overlap = 9.00 / 12.00)(pattern support = 19 / 20)(pattern violations = 1 / 291)*(violation support = 1 / 33)
O-E2MNPSPVVSPU	385	(overlap = 9.00 / 12.00)(pattern support = 19 / 20)(pattern violations = 1 / 291)(violation support = 1 / 33)(1 / 1614 (String))
O-E2MNPSVS	306	(overlap = 9.00 / 12.00)(pattern support = 19 / 20)(violation support = 1 / 33)
O-E2MNPSVS*PU	357	(overlap = 9.00 / 12.00)(pattern support = 19 / 20)(violation support = 1 / 33)*(1 / 1614 (String))
O-E2MN*PU	454	(overlap = 9.00 / 12.00)*(1 / 1614 (String))
O-E2MN*PV	-	filtered
O-E2MNPVPU	-	filtered
O-E2MNPVVS	408	(overlap = 9.00 / 12.00)(pattern violations = 1 / 291)(violation support = 1 / 33)
O-E2MNPVVS*PU	497	(overlap = 9.00 / 12.00)(pattern violations = 1 / 291)(violation support = 1 / 33)*(1 / 1614 (String))
O-E2MN*VS	374	(overlap = 9.00 / 12.00)*(violation support = 1 / 33)
O-E2MNVSPU	496	(overlap = 9.00 / 12.00)(violation support = 1 / 33)(1 / 1614 (String))
PS	62	(pattern support = 19 / 20)
PS*PU	216	(pattern support = 19 / 20)*(1 / 1614 (String))
PS*PV	240	(pattern support = 19 / 20)*(pattern violations = 1 / 291)
PSPVPU	353	(pattern support = 19 / 20)(pattern violations = 1 / 291)(1 / 1614 (String))
PSPVVS	385	(pattern support = 19 / 20)(pattern violations = 1 / 291)(violation support = 1 / 33)
PSPVVS*PU	492	(pattern support = 19 / 20)(pattern violations = 1 / 291)(violation support = 1 / 33)*(1 / 1614 (String))
PS*VS	308	(pattern support = 19 / 20)*(violation support = 1 / 33)
PSVSPU	358	(pattern support = 19 / 20)(violation support = 1 / 33)(1 / 1614 (String))
PU	-	filtered
PV	-	filtered
PV*PU	-	filtered
PV*VS	426	(pattern violations = 1 / 291)*(violation support = 1 / 33)
PVVSPU	515	(pattern violations = 1 / 291)(violation support = 1 / 33)(1 / 1614 (String))
Rareness	308	1 - (33 / 19)
VS	406	(violation support = 1 / 33)
VS*PU	511	(violation support = 1 / 33)*(1 / 1614 (String))

aclang/587/build/src/java/org/apache/commons/lang/WordUtils.java#uncapitalize(String, char[])
aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#isWhitespace(String)
aclang/587/build/src/java/org/apache/commons/lang/WordUtils.java#initials(String, char[])
aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#isAlphanumericSpace(String)
aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#containsNone(String, char[])

588

Strategy	Rank	Desc
	-	filtered
Confidence	-	filtered
DefectIndicator	-	filtered
O-E2MN	-	filtered
O-E2MN*PS	-	filtered
O-E2MNPSPU	-	filtered
O-E2MNPSPV	-	filtered
O-E2MNPSPV*PU	-	filtered
O-E2MNPSPV*VS	-	filtered
O-E2MNPSPVVSPU	-	filtered
O-E2MNPSVS	-	filtered
O-E2MNPSVS*PU	-	filtered
O-E2MN*PU	-	filtered
O-E2MN*PV	420	(overlap = 3.00 / 4.00)*(pattern violations = 1 / 287)
O-E2MNPVPU	509	(overlap = 3.00 / 4.00)(pattern violations = 1 / 287)(1 / 1614 (String))
O-E2MNPVVS	-	filtered
O-E2MNPVVS*PU	-	filtered
O-E2MN*VS	-	filtered
O-E2MNVSPU	-	filtered
PS	-	filtered
PS*PU	-	filtered
PS*PV	-	filtered
PSPVPU	-	filtered
PSPVVS	-	filtered
PSPVVS*PU	-	filtered
PS*VS	-	filtered
PSVSPU	-	filtered
PU	-	filtered
PV	-	filtered
PV*PU	-	filtered
PV*VS	-	filtered
PVVSPU	-	filtered
Rareness	-	filtered
VS	-	filtered
VS*PU	-	filtered

aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#indexOfAnyBut(String, String)
aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#indexOfAny(String, char[])
aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#removeEnd(String, String)
aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#removeEndIgnoreCase(String, String)
aclang/587/build/src/java/org/apache/commons/lang/StringUtils.java#removeStartIgnoreCase(String, String)