com.mebigfatguy.fbcontrib.detect

Class LoggerOddities

java.lang.Object

edu.umd.cs.findbugs.visitclass.BetterVisitor

edu.umd.cs.findbugs.visitclass.PreorderVisitor

edu.umd.cs.findbugs.visitclass.AnnotationVisitor

edu.umd.cs.findbugs.visitclass.DismantleBytecode

edu.umd.cs.findbugs.BytecodeScanningDetector

com.mebigfatguy.fbcontrib.detect.LoggerOddities

All Implemented Interfaces:

edu.umd.cs.findbugs.Detector, edu.umd.cs.findbugs.Priorities, edu.umd.cs.findbugs.visitclass.Constants2, org.apache.bcel.classfile.Visitor, org.apache.bcel.Constants

@OpcodeStack.CustomUserValue
public class LoggerOddities
extends edu.umd.cs.findbugs.BytecodeScanningDetector

looks for uses of log4j or slf4j where the class specified when creating the logger is not the same as the class in which this logger is used. Also looks for using concatenation with slf4j logging rather than using the parameterized interface.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	LoggerOddities.LOUserValue<T>

Field Summary

Fields

Modifier and Type	Field and Description
private static java.util.regex.Pattern	BAD_FORMATTING_ANCHOR
private static java.util.regex.Pattern	BAD_STRING_FORMAT_PATTERN
private edu.umd.cs.findbugs.BugReporter	bugReporter
private static java.lang.String	COMMONS_LOGGER
private static java.util.regex.Pattern	FORMATTER_ANCHOR
private java.util.Set<java.lang.String>	formatterLoggers
private boolean	isStaticInitializer
private static java.lang.String	LOG4J_LOGGER
private static java.lang.String	LOG4J2_LOGGER
private static java.lang.String	LOG4J2_LOGMANAGER
private static java.util.Set<java.lang.String>	LOGGER_METHODS
private java.lang.String	nameOfThisClass
private static java.util.regex.Pattern	NON_SIMPLE_FORMAT
private static java.lang.String	SIG_CLASS_TO_COMMONS_LOGGER
private static java.lang.String	SIG_CLASS_TO_LOG4J_LOGGER
private static java.lang.String	SIG_CLASS_TO_LOG4J2_LOGGER
private static java.lang.String	SIG_CLASS_TO_SLF4J_LOGGER
private static java.lang.String	SIG_OBJECT_AND_THROWABLE_TO_VOID
private static java.lang.String	SIG_STRING_AND_FACTORY_TO_LOG4J_LOGGER
private static java.lang.String	SIG_STRING_AND_OBJECT_ARRAY_TO_VOID
private static java.lang.String	SIG_STRING_AND_THROWABLE_TO_VOID
private static java.lang.String	SIG_STRING_AND_TWO_OBJECTS_TO_VOID
private static java.lang.String	SIG_STRING_TO_COMMONS_LOGGER
private static java.lang.String	SIG_STRING_TO_LOG4J_LOGGER
private static java.lang.String	SIG_STRING_TO_LOG4J2_LOGGER
private static java.lang.String	SIG_STRING_TO_SLF4J_LOGGER
private static java.lang.String	SLF4J_LOGGER
private edu.umd.cs.findbugs.OpcodeStack	stack
private org.apache.bcel.classfile.JavaClass	throwableClass

Fields inherited from class edu.umd.cs.findbugs.visitclass.DismantleBytecode

codeBytes, lineNumberTable, M_BR, M_CP, M_INT, M_PAD, M_R, M_UINT

Fields inherited from interface edu.umd.cs.findbugs.Priorities

EXP_PRIORITY, HIGH_PRIORITY, IGNORE_PRIORITY, LOW_PRIORITY, NORMAL_PRIORITY

Fields inherited from interface org.apache.bcel.Constants

AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_SYPER, ACC_TRANSIENT, ACC_VARARGS, ACC_VOLATILE, ACCESS_NAMES, ACONST_NULL, ALOAD, ALOAD_0, ALOAD_1, ALOAD_2, ALOAD_3, ANEWARRAY, ANEWARRAY_QUICK, APPEND_FRAME, APPEND_FRAME_MAX, ARETURN, ARRAYLENGTH, ASTORE, ASTORE_0, ASTORE_1, ASTORE_2, ASTORE_3, ATHROW, ATTR_ANNOTATION_DEFAULT, ATTR_CODE, ATTR_CONSTANT_VALUE, ATTR_DEPRECATED, ATTR_ENCLOSING_METHOD, ATTR_EXCEPTIONS, ATTR_INNER_CLASSES, ATTR_LINE_NUMBER_TABLE, ATTR_LOCAL_VARIABLE_TABLE, ATTR_LOCAL_VARIABLE_TYPE_TABLE, ATTR_PMG, ATTR_RUNTIME_VISIBLE_ANNOTATIONS, ATTR_RUNTIME_VISIBLE_PARAMETER_ANNOTATIONS, ATTR_RUNTIMEIN_VISIBLE_ANNOTATIONS, ATTR_RUNTIMEIN_VISIBLE_PARAMETER_ANNOTATIONS, ATTR_SIGNATURE, ATTR_SOURCE_FILE, ATTR_STACK_MAP, ATTR_STACK_MAP_TABLE, ATTR_SYNTHETIC, ATTR_UNKNOWN, ATTRIBUTE_NAMES, BALOAD, BASTORE, BIPUSH, BREAKPOINT, CALOAD, CASTORE, CHECKCAST, CHECKCAST_QUICK, CHOP_FRAME, CHOP_FRAME_MAX, CLASS_TYPE_NAMES, CONSTANT_Class, CONSTANT_Double, CONSTANT_Fieldref, CONSTANT_Float, CONSTANT_Integer, CONSTANT_InterfaceMethodref, CONSTANT_InvokeDynamic, CONSTANT_Long, CONSTANT_MethodHandle, CONSTANT_Methodref, CONSTANT_MethodType, CONSTANT_NameAndType, CONSTANT_NAMES, CONSTANT_String, CONSTANT_Utf8, CONSTRUCTOR_NAME, CONSUME_STACK, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DLOAD_0, DLOAD_1, DLOAD_2, DLOAD_3, DMUL, DNEG, DREM, DRETURN, DSTORE, DSTORE_0, DSTORE_1, DSTORE_2, DSTORE_3, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAD_0, FLOAD_1, FLOAD_2, FLOAD_3, FMUL, FNEG, FREM, FRETURN, FSTORE, FSTORE_0, FSTORE_1, FSTORE_2, FSTORE_3, FSUB, FULL_FRAME, GETFIELD, GETFIELD_QUICK, GETFIELD_QUICK_W, GETFIELD2_QUICK, GETSTATIC, GETSTATIC_QUICK, GETSTATIC2_QUICK, GOTO, GOTO_W, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILLEGAL_OPCODE, ILLEGAL_TYPE, ILOAD, ILOAD_0, ILOAD_1, ILOAD_2, ILOAD_3, IMPDEP1, IMPDEP2, IMUL, INEG, INSTANCEOF, INSTANCEOF_QUICK, INT2BYTE, INT2CHAR, INT2SHORT, INTERFACES_IMPLEMENTED_BY_ARRAYS, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKEINTERFACE_QUICK, INVOKENONVIRTUAL, INVOKENONVIRTUAL_QUICK, INVOKESPECIAL, INVOKESTATIC, INVOKESTATIC_QUICK, INVOKESUPER_QUICK, INVOKEVIRTUAL, INVOKEVIRTUAL_QUICK, INVOKEVIRTUAL_QUICK_W, INVOKEVIRTUALOBJECT_QUICK, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISTORE_0, ISTORE_1, ISTORE_2, ISTORE_3, ISUB, ITEM_Bogus, ITEM_Double, ITEM_Float, ITEM_InitObject, ITEM_Integer, ITEM_Long, ITEM_NAMES, ITEM_NewObject, ITEM_Null, ITEM_Object, IUSHR, IXOR, JSR, JSR_W, KNOWN_ATTRIBUTES, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDC_QUICK, LDC_W, LDC_W_QUICK, LDC2_W, LDC2_W_QUICK, LDIV, LLOAD, LLOAD_0, LLOAD_1, LLOAD_2, LLOAD_3, LMUL, LNEG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSTORE_0, LSTORE_1, LSTORE_2, LSTORE_3, LSUB, LUSHR, LXOR, MAJOR, MAJOR_1_1, MAJOR_1_2, MAJOR_1_3, MAJOR_1_4, MAJOR_1_5, MAJOR_1_6, MAJOR_1_7, MAJOR_1_8, MAX_ACC_FLAG, MAX_BYTE, MAX_CODE_SIZE, MAX_CP_ENTRIES, MAX_SHORT, MINOR, MINOR_1_1, MINOR_1_2, MINOR_1_3, MINOR_1_4, MINOR_1_5, MINOR_1_6, MINOR_1_7, MINOR_1_8, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, MULTIANEWARRAY_QUICK, NEW, NEW_QUICK, NEWARRAY, NO_OF_OPERANDS, NOP, OPCODE_NAMES, POP, POP2, PRODUCE_STACK, PUSH, PUTFIELD, PUTFIELD_QUICK, PUTFIELD_QUICK_W, PUTFIELD2_QUICK, PUTSTATIC, PUTSTATIC_QUICK, PUTSTATIC2_QUICK, RESERVED, RET, RETURN, SALOAD, SAME_FRAME, SAME_FRAME_EXTENDED, SAME_FRAME_MAX, SAME_LOCALS_1_STACK_ITEM_FRAME, SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED, SAME_LOCALS_1_STACK_ITEM_FRAME_MAX, SASTORE, SHORT_TYPE_NAMES, SIPUSH, STATIC_INITIALIZER_NAME, SWAP, SWITCH, T_ADDRESS, T_ARRAY, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_OBJECT, T_REFERENCE, T_SHORT, T_UNKNOWN, T_VOID, TABLESWITCH, TYPE_NAMES, TYPE_OF_OPERANDS, UNDEFINED, UNPREDICTABLE, WIDE

Constructor Summary

Constructors

Constructor and Description
LoggerOddities(edu.umd.cs.findbugs.BugReporter bugReporter) constructs a LO detector given the reporter to report bugs on.

Method Summary

Modifier and Type	Method and Description
private void	checkForLoggerParam() looks for slf4j calls where an exception is passed as a logger parameter, expecting to be substituted for a {} marker.
private void	checkForProblemsWithLoggerMethods() looks for a variety of logging issues with log statements
private void	checkForProblemsWithLoggerParameterisedMethods(java.lang.String sig)
private void	checkForProblemsWithLoggerSingleArgumentMethod()
private void	checkForProblemsWithLoggerThrowableMethods()
private static int	countAnchors(java.lang.String formatString) returns the number of anchors {} in a string
private java.lang.String	getLoggingClassNameFromStackValue()
private int	getVarArgsParmCount(java.lang.String signature) returns the number of parameters slf4j or log4j2 is expecting to inject into the format string
private boolean	hasExceptionOnStack() returns whether an exception object is on the stack slf4j will find this, and not include it in the parm list so i we find one, just don't report
private boolean	isLoggerWithClassParm(edu.umd.cs.findbugs.ba.XMethod m) returns whether this method class is a standard logger instantiation that takes a java/lang/Class parameter
private boolean	isNonPrivateLogField(java.lang.String fieldClsName, java.lang.String fieldName, java.lang.String fieldSig) looks to see if this field is a logger, and declared non privately
private void	lookForSuspectClasses() looks for instantiation of a logger with what looks like a class name that isn't the same as the class in which it exists.
void	sawOpcode(int seen) implements the visitor to look for calls to Logger.getLogger with the wrong class name
void	visitClassContext(edu.umd.cs.findbugs.ba.ClassContext classContext) implements the visitor to discover what the class name is if it is a normal class, or the owning class, if the class is an anonymous class.
void	visitCode(org.apache.bcel.classfile.Code obj) implements the visitor to reset the stack

Methods inherited from class edu.umd.cs.findbugs.BytecodeScanningDetector

getClassContext, report, shouldVisitCode

Methods inherited from class edu.umd.cs.findbugs.visitclass.DismantleBytecode

afterOpcode, areOppositeBranches, atCatchBlock, beforeOpcode, getBranchFallThrough, getBranchOffset, getBranchTarget, getClassConstantOperand, getClassDescriptorOperand, getCodeByte, getConstantRefOperand, getDefaultSwitchOffset, getDottedClassConstantOperand, getFieldDescriptorOperand, getIntConstant, getLongConstant, getMaxPC, getMethodDescriptorOperand, getNameConstantOperand, getNextCodeByte, getNextOpcode, getNextPC, getOpcode, getPC, getPrevOpcode, getRefConstantOperand, getRefFieldIsStatic, getRegisterOperand, getSigConstantOperand, getStringConstantOperand, getSwitchLabels, getSwitchOffsets, getXClassOperand, getXFieldOperand, getXMethodOperand, isBranch, isMethodCall, isRegisterLoad, isRegisterStore, isRegisterStore, isReturn, isShift, isSwitch, isWideOpcode, printOpCode, sawBranchTo, sawClass, sawDouble, sawField, sawFloat, sawIMethod, sawInt, sawLong, sawMethod, sawRegister, sawString, visit

Methods inherited from class edu.umd.cs.findbugs.visitclass.AnnotationVisitor

getAnnotationParameterAsString, getAnnotationParameterAsStringArray, visitAnnotation, visitAnnotation, visitParameterAnnotation, visitParameterAnnotation, visitSyntheticParameterAnnotation

Methods inherited from class edu.umd.cs.findbugs.visitclass.PreorderVisitor

amVisitingMainMethod, asUnsignedByte, doVisitMethod, getClassDescriptor, getClassName, getCode, getConstantPool, getDottedClassName, getDottedFieldSig, getDottedMethodSig, getDottedSuperclassName, getField, getFieldDescriptor, getFieldIsStatic, getFieldName, getFieldSig, getFullyQualifiedFieldName, getFullyQualifiedMethodName, getMethod, getMethodDescriptor, getMethodName, getMethodSig, getMethodVisitOrder, getNumberArguments, getNumberMethodArguments, getPackageName, getSizeOfSurroundingTryBlock, getSizeOfSurroundingTryBlock, getSourceFile, getStringFromIndex, getSuperclassName, getSurroundingCaughtExceptions, getSurroundingCaughtExceptions, getSurroundingTryBlock, getSurroundingTryBlock, getThisClass, getXClass, getXField, getXMethod, hasInterestingClass, hasInterestingMethod, isVisitMethodsInCallOrder, setupVisitorForClass, setVisitMethodsInCallOrder, shouldVisit, toString, visitAfter, visitAfter, visitAnnotationDefault, visitAnnotationEntry, visitConstantPool, visitEnclosingMethod, visitingField, visitingMethod, visitInnerClasses, visitJavaClass, visitLineNumberTable, visitLocalVariableTable, visitStackMapTable, visitStackMapTableEntry

Methods inherited from class edu.umd.cs.findbugs.visitclass.BetterVisitor

clone, report, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitCodeException, visitConstantClass, visitConstantDouble, visitConstantFieldref, visitConstantFloat, visitConstantInteger, visitConstantInterfaceMethodref, visitConstantLong, visitConstantMethodref, visitConstantNameAndType, visitConstantString, visitConstantUtf8, visitConstantValue, visitDeprecated, visitExceptionTable, visitField, visitInnerClass, visitLineNumber, visitLocalVariable, visitLocalVariableTypeTable, visitMethod, visitSignature, visitSourceFile, visitStackMap, visitStackMapEntry, visitSynthetic, visitUnknown

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

LOGGER_METHODS

private static final java.util.Set<java.lang.String> LOGGER_METHODS

COMMONS_LOGGER

private static final java.lang.String COMMONS_LOGGER

See Also:

Constant Field Values

LOG4J_LOGGER

private static final java.lang.String LOG4J_LOGGER

See Also:

Constant Field Values

LOG4J2_LOGGER

private static final java.lang.String LOG4J2_LOGGER

See Also:

Constant Field Values

LOG4J2_LOGMANAGER

private static final java.lang.String LOG4J2_LOGMANAGER

See Also:

Constant Field Values

SLF4J_LOGGER

private static final java.lang.String SLF4J_LOGGER

See Also:

Constant Field Values

SIG_STRING_AND_TWO_OBJECTS_TO_VOID

private static final java.lang.String SIG_STRING_AND_TWO_OBJECTS_TO_VOID

SIG_STRING_AND_OBJECT_ARRAY_TO_VOID

private static final java.lang.String SIG_STRING_AND_OBJECT_ARRAY_TO_VOID

SIG_OBJECT_AND_THROWABLE_TO_VOID

private static final java.lang.String SIG_OBJECT_AND_THROWABLE_TO_VOID

SIG_STRING_AND_THROWABLE_TO_VOID

private static final java.lang.String SIG_STRING_AND_THROWABLE_TO_VOID

SIG_CLASS_TO_COMMONS_LOGGER

private static final java.lang.String SIG_CLASS_TO_COMMONS_LOGGER

SIG_CLASS_TO_LOG4J_LOGGER

private static final java.lang.String SIG_CLASS_TO_LOG4J_LOGGER

SIG_CLASS_TO_LOG4J2_LOGGER

private static final java.lang.String SIG_CLASS_TO_LOG4J2_LOGGER

SIG_CLASS_TO_SLF4J_LOGGER

private static final java.lang.String SIG_CLASS_TO_SLF4J_LOGGER

SIG_STRING_TO_COMMONS_LOGGER

private static final java.lang.String SIG_STRING_TO_COMMONS_LOGGER

SIG_STRING_TO_LOG4J_LOGGER

private static final java.lang.String SIG_STRING_TO_LOG4J_LOGGER

SIG_STRING_TO_LOG4J2_LOGGER

private static final java.lang.String SIG_STRING_TO_LOG4J2_LOGGER

SIG_STRING_TO_SLF4J_LOGGER

private static final java.lang.String SIG_STRING_TO_SLF4J_LOGGER

SIG_STRING_AND_FACTORY_TO_LOG4J_LOGGER

private static final java.lang.String SIG_STRING_AND_FACTORY_TO_LOG4J_LOGGER

BAD_FORMATTING_ANCHOR

private static final java.util.regex.Pattern BAD_FORMATTING_ANCHOR

BAD_STRING_FORMAT_PATTERN

private static final java.util.regex.Pattern BAD_STRING_FORMAT_PATTERN

FORMATTER_ANCHOR

private static final java.util.regex.Pattern FORMATTER_ANCHOR

NON_SIMPLE_FORMAT

private static final java.util.regex.Pattern NON_SIMPLE_FORMAT

bugReporter

private final edu.umd.cs.findbugs.BugReporter bugReporter

formatterLoggers

private java.util.Set<java.lang.String> formatterLoggers

throwableClass

private org.apache.bcel.classfile.JavaClass throwableClass

stack

private edu.umd.cs.findbugs.OpcodeStack stack

nameOfThisClass

private java.lang.String nameOfThisClass

isStaticInitializer

private boolean isStaticInitializer

Constructor Detail

LoggerOddities

public LoggerOddities(edu.umd.cs.findbugs.BugReporter bugReporter)

constructs a LO detector given the reporter to report bugs on.

Parameters:

bugReporter - the sync of bug reports

Method Detail

visitClassContext

public void visitClassContext(edu.umd.cs.findbugs.ba.ClassContext classContext)

implements the visitor to discover what the class name is if it is a normal class, or the owning class, if the class is an anonymous class.

Specified by:

visitClassContext in interface edu.umd.cs.findbugs.Detector

Overrides:

visitClassContext in class edu.umd.cs.findbugs.BytecodeScanningDetector

Parameters:

classContext - the context object of the currently parsed class

visitCode

public void visitCode(org.apache.bcel.classfile.Code obj)

implements the visitor to reset the stack

Specified by:

visitCode in interface org.apache.bcel.classfile.Visitor

Overrides:

visitCode in class edu.umd.cs.findbugs.visitclass.PreorderVisitor

Parameters:

obj - the context object of the currently parsed code block

sawOpcode

public void sawOpcode(int seen)

implements the visitor to look for calls to Logger.getLogger with the wrong class name

Overrides:

sawOpcode in class edu.umd.cs.findbugs.visitclass.DismantleBytecode

Parameters:

seen - the opcode of the currently parsed instruction

isNonPrivateLogField

private boolean isNonPrivateLogField(@SlashedClassName
                                     java.lang.String fieldClsName,
                                     java.lang.String fieldName,
                                     java.lang.String fieldSig)

looks to see if this field is a logger, and declared non privately

Parameters:

fieldClsName - the owning class type of the field

fieldName - the name of the field

fieldSig - the signature of the field

Returns:

if the field is a logger and not private

isLoggerWithClassParm

private boolean isLoggerWithClassParm(edu.umd.cs.findbugs.ba.XMethod m)

returns whether this method class is a standard logger instantiation that takes a java/lang/Class parameter

Parameters:

m - the method to check

Returns:

if the method is a logger factory method that takes a Class object

checkForProblemsWithLoggerMethods

private void checkForProblemsWithLoggerMethods()
                                        throws java.lang.ClassNotFoundException

looks for a variety of logging issues with log statements

Throws:

java.lang.ClassNotFoundException - if the exception class, or a parent class can't be found

checkForProblemsWithLoggerThrowableMethods

private void checkForProblemsWithLoggerThrowableMethods()

checkForProblemsWithLoggerSingleArgumentMethod

private void checkForProblemsWithLoggerSingleArgumentMethod()
                                                     throws java.lang.ClassNotFoundException

Throws:

java.lang.ClassNotFoundException

checkForProblemsWithLoggerParameterisedMethods

private void checkForProblemsWithLoggerParameterisedMethods(java.lang.String sig)

checkForLoggerParam

private void checkForLoggerParam()

looks for slf4j calls where an exception is passed as a logger parameter, expecting to be substituted for a {} marker. As slf4j just passes the exception down to the message generation itself, the {} marker will go unpopulated.

lookForSuspectClasses

private void lookForSuspectClasses()

looks for instantiation of a logger with what looks like a class name that isn't the same as the class in which it exists. There are some cases where a 'classname-like' string is presented purposely different than this class, and an attempt is made to ignore those.

getLoggingClassNameFromStackValue

@Nullable
private java.lang.String getLoggingClassNameFromStackValue()

countAnchors

private static int countAnchors(java.lang.String formatString)

returns the number of anchors {} in a string

Parameters:

formatString - the format string

Returns:

the number of anchors

getVarArgsParmCount

private int getVarArgsParmCount(java.lang.String signature)

returns the number of parameters slf4j or log4j2 is expecting to inject into the format string

Parameters:

signature - the method signature of the error, warn, info, debug statement

Returns:

the number of expected parameters

hasExceptionOnStack

private boolean hasExceptionOnStack()

returns whether an exception object is on the stack slf4j will find this, and not include it in the parm list so i we find one, just don't report

Returns:

whether or not an exception i present