diff --git a/.idea/inspectionProfiles/profiles_settings.xml b/.idea/inspectionProfiles/profiles_settings.xml
new file mode 100644
index 0000000..dc2dcae
--- /dev/null
+++ b/.idea/inspectionProfiles/profiles_settings.xml
@@ -0,0 +1,7 @@
+<component name="InspectionProjectProfileManager">
+  <settings>
+    <option name="PROJECT_PROFILE" value="Erik's Default" />
+    <option name="USE_PROJECT_PROFILE" value="false" />
+    <version value="1.0" />
+  </settings>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 9540c66..05b6e27 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -12,7 +12,7 @@
   <component name="JavaScriptSettings">
     <option name="languageLevel" value="ES6" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_13" project-jdk-name="13" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="false" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/config/checkstyle/checkstyle.xml b/config/checkstyle/checkstyle.xml
new file mode 100644
index 0000000..c5f6465
--- /dev/null
+++ b/config/checkstyle/checkstyle.xml
@@ -0,0 +1,277 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+        "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+        "https://checkstyle.org/dtds/configuration_1_3.dtd">
+
+<!--
+    Checkstyle configuration that checks the Google coding conventions from Google Java Style
+    that can be found at https://google.github.io/styleguide/javaguide.html.
+
+    Checkstyle is very configurable. Be sure to read the documentation at
+    http://checkstyle.sf.net (or in your downloaded distribution).
+
+    To completely disable a check, just comment it out or delete it from the file.
+
+    Authors: Max Vetrenko, Ruslan Diachenko, Roman Ivanov.
+ -->
+
+<module name="Checker">
+    <property name="charset" value="UTF-8"/>
+
+    <property name="severity" value="warning"/>
+
+    <property name="fileExtensions" value="java, properties, xml"/>
+    <!-- Excludes all 'module-info.java' files              -->
+    <!-- See https://checkstyle.org/config_filefilters.html -->
+    <module name="BeforeExecutionExclusionFileFilter">
+        <property name="fileNamePattern" value="module\-info\.java$"/>
+    </module>
+    <!-- Checks for whitespace                               -->
+    <!-- See http://checkstyle.sf.net/config_whitespace.html -->
+    <module name="FileTabCharacter">
+        <property name="eachLine" value="true"/>
+    </module>
+
+    <module name="LineLength">
+        <property name="max" value="120"/>
+        <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
+    </module>
+
+    <module name="SuppressWarningsFilter"/>
+
+    <module name="SuppressWithPlainTextCommentFilter">
+        <property name="offCommentFormat" value="CHECKSTYLE_OFF"/>
+        <property name="onCommentFormat" value="CHECKSTYLE_ON"/>
+        <property name="checkFormat"
+                  value="^((?!(FileTabCharacterCheck)).)*$"/>
+    </module>
+
+    <module name="TreeWalker">
+        <module name="SuppressWarningsHolder"/>
+        <module name="SuppressionCommentFilter">
+            <property name="offCommentFormat" value="CHECKSTYLE_OFF: ALMOST_ALL"/>
+            <property name="onCommentFormat" value="CHECKSTYLE_ON: ALMOST_ALL"/>
+            <property name="checkFormat" value="^((?!(EqualsHashCode)).)*$"/>
+        </module>
+        <module name="OuterTypeFilename"/>
+        <module name="IllegalTokenText">
+            <property name="tokens" value="STRING_LITERAL, CHAR_LITERAL"/>
+            <property name="format"
+                      value="\\u00(09|0(a|A)|0(c|C)|0(d|D)|22|27|5(C|c))|\\(0(10|11|12|14|15|42|47)|134)"/>
+            <property name="message"
+                      value="Consider using special escape sequence instead of octal value or Unicode escaped value."/>
+        </module>
+        <module name="AvoidEscapedUnicodeCharacters">
+            <property name="allowEscapesForControlCharacters" value="true"/>
+            <property name="allowByTailComment" value="true"/>
+            <property name="allowNonPrintableEscapes" value="true"/>
+        </module>
+        <module name="AvoidStarImport"/>
+        <module name="OneTopLevelClass"/>
+        <module name="NoLineWrap"/>
+        <module name="EmptyBlock">
+            <property name="option" value="TEXT"/>
+            <property name="tokens"
+                      value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
+        </module>
+        <module name="NeedBraces"/>
+        <module name="LeftCurly"/>
+        <module name="RightCurly">
+            <property name="id" value="RightCurlySame"/>
+            <property name="tokens"
+                      value="LITERAL_TRY, LITERAL_CATCH, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE,
+                    LITERAL_DO"/>
+        </module>
+        <module name="RightCurly">
+            <property name="id" value="RightCurlyAlone"/>
+            <property name="option" value="alone"/>
+            <property name="tokens"
+                      value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, STATIC_INIT,
+                    INSTANCE_INIT"/>
+        </module>
+        <module name="WhitespaceAround">
+            <property name="allowEmptyConstructors" value="true"/>
+            <property name="allowEmptyLambdas" value="true"/>
+            <property name="allowEmptyMethods" value="true"/>
+            <property name="allowEmptyTypes" value="true"/>
+            <property name="allowEmptyLoops" value="true"/>
+            <message key="ws.notFollowed"
+                     value="WhitespaceAround: ''{0}'' is not followed by whitespace. Empty blocks may only be represented as '{}' when not part of a multi-block statement (4.1.3)"/>
+            <message key="ws.notPreceded"
+                     value="WhitespaceAround: ''{0}'' is not preceded with whitespace."/>
+        </module>
+        <module name="OneStatementPerLine"/>
+        <module name="MultipleVariableDeclarations"/>
+        <module name="ArrayTypeStyle"/>
+        <module name="MissingSwitchDefault"/>
+        <module name="FallThrough"/>
+        <module name="UpperEll"/>
+        <module name="ModifierOrder"/>
+        <module name="EmptyLineSeparator">
+            <property name="allowNoEmptyLineBetweenFields" value="true"/>
+        </module>
+        <module name="SeparatorWrap">
+            <property name="id" value="SeparatorWrapDot"/>
+            <property name="tokens" value="DOT"/>
+            <property name="option" value="nl"/>
+        </module>
+        <module name="SeparatorWrap">
+            <property name="id" value="SeparatorWrapComma"/>
+            <property name="tokens" value="COMMA"/>
+            <property name="option" value="EOL"/>
+        </module>
+        <module name="SeparatorWrap">
+            <!-- ELLIPSIS is EOL until https://github.com/google/styleguide/issues/258 -->
+            <property name="id" value="SeparatorWrapEllipsis"/>
+            <property name="tokens" value="ELLIPSIS"/>
+            <property name="option" value="EOL"/>
+        </module>
+        <module name="SeparatorWrap">
+            <!-- ARRAY_DECLARATOR is EOL until https://github.com/google/styleguide/issues/259 -->
+            <property name="id" value="SeparatorWrapArrayDeclarator"/>
+            <property name="tokens" value="ARRAY_DECLARATOR"/>
+            <property name="option" value="EOL"/>
+        </module>
+        <module name="SeparatorWrap">
+            <property name="id" value="SeparatorWrapMethodRef"/>
+            <property name="tokens" value="METHOD_REF"/>
+            <property name="option" value="nl"/>
+        </module>
+        <module name="PackageName">
+            <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
+            <message key="name.invalidPattern"
+                     value="Package name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="TypeName">
+            <message key="name.invalidPattern"
+                     value="Type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="MemberName">
+            <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/>
+            <message key="name.invalidPattern"
+                     value="Member name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="ParameterName">
+            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="LambdaParameterName">
+            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Lambda parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="CatchParameterName">
+            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Catch parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="LocalVariableName">
+            <property name="tokens" value="VARIABLE_DEF"/>
+            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Local variable name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="ClassTypeParameterName">
+            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+            <message key="name.invalidPattern"
+                     value="Class type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="MethodTypeParameterName">
+            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+            <message key="name.invalidPattern"
+                     value="Method type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="InterfaceTypeParameterName">
+            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+            <message key="name.invalidPattern"
+                     value="Interface type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="NoFinalizer"/>
+        <module name="GenericWhitespace">
+            <message key="ws.followed"
+                     value="GenericWhitespace ''{0}'' is followed by whitespace."/>
+            <message key="ws.preceded"
+                     value="GenericWhitespace ''{0}'' is preceded with whitespace."/>
+            <message key="ws.illegalFollow"
+                     value="GenericWhitespace ''{0}'' should followed by whitespace."/>
+            <message key="ws.notPreceded"
+                     value="GenericWhitespace ''{0}'' is not preceded with whitespace."/>
+        </module>
+        <module name="Indentation">
+            <property name="basicOffset" value="4"/>
+            <property name="braceAdjustment" value="0"/>
+            <property name="caseIndent" value="4"/>
+            <property name="throwsIndent" value="4"/>
+            <property name="lineWrappingIndentation" value="4"/>
+            <property name="arrayInitIndent" value="4"/>
+        </module>
+        <module name="AbbreviationAsWordInName">
+            <property name="ignoreFinal" value="false"/>
+            <property name="allowedAbbreviationLength" value="1"/>
+        </module>
+        <module name="OverloadMethodsDeclarationOrder"/>
+        <module name="VariableDeclarationUsageDistance"/>
+        <module name="CustomImportOrder">
+            <property name="customImportOrderRules"
+                      value="THIRD_PARTY_PACKAGE###SPECIAL_IMPORTS###STANDARD_JAVA_PACKAGE###STATIC"/>
+            <property name="specialImportsRegExp" value="^javax\."/>
+            <property name="standardPackageRegExp" value="^java\."/>
+            <property name="sortImportsInGroupAlphabetically" value="true"/>
+            <property name="separateLineBetweenGroups" value="false"/>
+        </module>
+        <module name="MethodParamPad"/>
+        <module name="NoWhitespaceBefore">
+            <property name="tokens"
+                      value="COMMA, SEMI, POST_INC, POST_DEC, DOT, ELLIPSIS, METHOD_REF"/>
+            <property name="allowLineBreaks" value="true"/>
+        </module>
+        <module name="ParenPad"/>
+        <module name="OperatorWrap">
+            <property name="option" value="NL"/>
+            <property name="tokens"
+                      value="BAND, BOR, BSR, BXOR, DIV, EQUAL, GE, GT, LAND, LE, LITERAL_INSTANCEOF, LOR,
+                    LT, MINUS, MOD, NOT_EQUAL, PLUS, QUESTION, SL, SR, STAR, METHOD_REF "/>
+        </module>
+        <module name="AnnotationLocation">
+            <property name="id" value="AnnotationLocationMostCases"/>
+            <property name="tokens"
+                      value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF"/>
+        </module>
+        <module name="AnnotationLocation">
+            <property name="id" value="AnnotationLocationVariables"/>
+            <property name="tokens" value="VARIABLE_DEF"/>
+            <property name="allowSamelineMultipleAnnotations" value="true"/>
+        </module>
+        <module name="NonEmptyAtclauseDescription"/>
+        <module name="JavadocTagContinuationIndentation"/>
+        <module name="SummaryJavadoc">
+            <property name="forbiddenSummaryFragments"
+                      value="^@return the *|^This method returns |^A [{]@code [a-zA-Z0-9]+[}]( is a )"/>
+        </module>
+        <module name="JavadocParagraph"/>
+        <module name="AtclauseOrder">
+            <property name="tagOrder" value="@param, @return, @throws, @deprecated"/>
+            <property name="target"
+                      value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF, VARIABLE_DEF"/>
+        </module>
+        <module name="JavadocMethod">
+            <property name="scope" value="public"/>
+            <property name="allowMissingParamTags" value="true"/>
+            <property name="allowMissingReturnTag" value="true"/>
+            <property name="allowedAnnotations" value="Override, Test"/>
+        </module>
+        <module name="MethodName">
+            <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9_]*$"/>
+            <message key="name.invalidPattern"
+                     value="Method name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="SingleLineJavadoc">
+            <property name="ignoreInlineTags" value="false"/>
+        </module>
+        <module name="EmptyCatchBlock">
+            <property name="exceptionVariableName" value="expected"/>
+        </module>
+        <!-- <module name="CommentsIndentation"/> -->
+    </module>
+</module>
diff --git a/config/pmd.xml b/config/pmd.xml
new file mode 100644
index 0000000..22f6a03
--- /dev/null
+++ b/config/pmd.xml
@@ -0,0 +1,271 @@
+<?xml version="1.0"?>
+<!--
+  ~ pmd.xml
+  ~
+  ~ Copyright (c) 2010-2020, Erik C. Thauvin (erik@thauvin.net)
+  ~ All rights reserved.
+  -->
+
+<ruleset name="erik"
+         xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 https://pmd.sourceforge.io/ruleset_2_0_0.xsd">
+    <description>Erik's Ruleset</description>
+    <!-- BEST PRACTICES -->
+    <!--    <rule ref="category/java/bestpractices.xml/AvoidStringBufferField"/>-->
+    <rule ref="category/java/bestpractices.xml/AvoidUsingHardCodedIP"/>
+    <rule ref="category/java/bestpractices.xml/CheckResultSet"/>
+    <rule ref="category/java/bestpractices.xml/ConstantsInInterface"/>
+    <rule ref="category/java/bestpractices.xml/DefaultLabelNotLastInSwitchStmt"/>
+    <rule ref="category/java/bestpractices.xml/ForLoopCanBeForeach"/>
+    <rule ref="category/java/bestpractices.xml/GuardLogStatement"/>
+    <!-- <rule ref="category/java/bestpractices.xml/LooseCoupling"/> -->
+    <rule ref="category/java/bestpractices.xml/MethodReturnsInternalArray"/>
+    <rule ref="category/java/bestpractices.xml/MissingOverride">
+        <properties>
+            <property name="violationSuppressXPath"
+                      value="./MethodDeclarator[@Image='hashCode' or @Image='equals' or @Image='toString']"/>
+        </properties>
+    </rule>
+    <rule ref="category/java/bestpractices.xml/PositionLiteralsFirstInCaseInsensitiveComparisons"/>
+    <rule ref="category/java/bestpractices.xml/PositionLiteralsFirstInComparisons"/>
+    <rule ref="category/java/bestpractices.xml/PreserveStackTrace"/>
+    <rule ref="category/java/bestpractices.xml/ReplaceEnumerationWithIterator"/>
+    <!-- <rule ref="category/java/bestpractices.xml/ReplaceHashtableWithMap"/>
+    <rule ref="category/java/bestpractices.xml/ReplaceVectorWithList"/> -->
+    <rule ref="category/java/bestpractices.xml/SwitchStmtsShouldHaveDefault"/>
+    <rule ref="category/java/bestpractices.xml/SystemPrintln"/>
+    <rule ref="category/java/bestpractices.xml/UnusedFormalParameter"/>
+    <rule ref="category/java/bestpractices.xml/UnusedImports"/>
+    <rule ref="category/java/bestpractices.xml/UnusedLocalVariable"/>
+    <rule ref="category/java/bestpractices.xml/UnusedPrivateField"/>
+    <rule ref="category/java/bestpractices.xml/UnusedPrivateMethod"/>
+    <rule ref="category/java/bestpractices.xml/UseAssertEqualsInsteadOfAssertTrue"/>
+    <rule ref="category/java/bestpractices.xml/UseAssertNullInsteadOfAssertTrue"/>
+    <rule ref="category/java/bestpractices.xml/UseAssertSameInsteadOfAssertTrue"/>
+    <rule ref="category/java/bestpractices.xml/UseAssertTrueInsteadOfAssertEquals"/>
+    <rule ref="category/java/bestpractices.xml/UseCollectionIsEmpty"/>
+    <rule ref="category/java/bestpractices.xml/UseVarargs"/>
+
+
+    <!-- NAMING CONVENTIONS -->
+    <rule ref="category/java/codestyle.xml/FormalParameterNamingConventions"/>
+    <rule ref="category/java/codestyle.xml/GenericsNaming"/>
+    <rule ref="category/java/codestyle.xml/LocalVariableNamingConventions"/>
+    <rule ref="category/java/codestyle.xml/MethodNamingConventions"/>
+    <!--    <rule ref="category/java/codestyle.xml/PackageCase"/>-->
+
+
+    <!-- OTHER -->
+    <rule ref="category/java/codestyle.xml/AvoidDollarSigns"/>
+    <rule ref="category/java/codestyle.xml/AvoidProtectedFieldInFinalClass"/>
+    <rule ref="category/java/codestyle.xml/AvoidProtectedMethodInFinalClassNotExtending"/>
+    <rule ref="category/java/codestyle.xml/AvoidUsingNativeCode"/>
+    <rule ref="category/java/codestyle.xml/BooleanGetMethodName"/>
+    <rule ref="category/java/codestyle.xml/CallSuperInConstructor"/>
+    <rule ref="category/java/codestyle.xml/ControlStatementBraces"/>
+    <rule ref="category/java/codestyle.xml/DontImportJavaLang"/>
+    <rule ref="category/java/codestyle.xml/DuplicateImports"/>
+    <rule ref="category/java/codestyle.xml/EmptyMethodInAbstractClassShouldBeAbstract"/>
+    <rule ref="category/java/codestyle.xml/ExtendsObject"/>
+    <rule ref="category/java/codestyle.xml/FieldDeclarationsShouldBeAtStartOfClass"/>
+    <rule ref="category/java/codestyle.xml/ForLoopShouldBeWhileLoop"/>
+    <rule ref="category/java/codestyle.xml/IdenticalCatchBranches"/>
+    <rule ref="category/java/codestyle.xml/LocalVariableCouldBeFinal"/>
+    <rule ref="category/java/codestyle.xml/MethodArgumentCouldBeFinal"/>
+    <rule ref="category/java/codestyle.xml/NoPackage"/>
+    <rule ref="category/java/codestyle.xml/PrematureDeclaration"/>
+    <rule ref="category/java/codestyle.xml/TooManyStaticImports"/>
+    <rule ref="category/java/codestyle.xml/UnnecessaryAnnotationValueElement"/>
+    <rule ref="category/java/codestyle.xml/UnnecessaryConstructor"/>
+    <rule ref="category/java/codestyle.xml/UnnecessaryFullyQualifiedName"/>
+    <rule ref="category/java/codestyle.xml/UnnecessaryLocalBeforeReturn"/>
+    <rule ref="category/java/codestyle.xml/UnnecessaryReturn"/>
+    <rule ref="category/java/codestyle.xml/UselessQualifiedThis"/>
+
+
+    <!-- DESIGN -->
+    <rule ref="category/java/design.xml/AbstractClassWithoutAnyMethod"/>
+    <rule ref="category/java/design.xml/AvoidRethrowingException"/>
+    <rule ref="category/java/design.xml/AvoidThrowingNewInstanceOfSameException"/>
+    <rule ref="category/java/design.xml/AvoidThrowingNullPointerException"/>
+    <rule ref="category/java/design.xml/AvoidThrowingRawExceptionTypes"/>
+    <rule ref="category/java/design.xml/ClassWithOnlyPrivateConstructorsShouldBeFinal"/>
+    <rule ref="category/java/design.xml/CollapsibleIfStatements"/>
+    <rule ref="category/java/design.xml/CouplingBetweenObjects"/>
+    <rule ref="category/java/design.xml/DataClass"/>
+    <rule ref="category/java/design.xml/DoNotExtendJavaLangError"/>
+    <rule ref="category/java/design.xml/ExceptionAsFlowControl"/>
+    <!--    <rule ref="category/java/design.xml/ExcessivePublicCount"/>-->
+    <rule ref="category/java/design.xml/FinalFieldCouldBeStatic"/>
+    <rule ref="category/java/design.xml/ImmutableField"/>
+    <rule ref="category/java/design.xml/LogicInversion"/>
+    <rule ref="category/java/design.xml/SignatureDeclareThrowsException"/>
+    <rule ref="category/java/design.xml/SimplifiedTernary"/>
+    <rule ref="category/java/design.xml/SimplifyBooleanAssertion"/>
+    <rule ref="category/java/design.xml/SimplifyBooleanExpressions"/>
+    <rule ref="category/java/design.xml/SimplifyBooleanReturns"/>
+    <rule ref="category/java/design.xml/SimplifyConditional"/>
+    <rule ref="category/java/design.xml/SingularField"/>
+    <rule ref="category/java/design.xml/SwitchDensity"/>
+    <rule ref="category/java/design.xml/UselessOverridingMethod"/>
+    <rule ref="category/java/design.xml/UseUtilityClass"/>
+
+    <!-- DOCUMENTATION -->
+    <rule ref="category/java/documentation.xml/UncommentedEmptyConstructor"/>
+    <rule ref="category/java/documentation.xml/UncommentedEmptyMethodBody"/>
+
+
+    <!-- ERROR PRONE -->
+    <rule ref="category/java/errorprone.xml/AssignmentInOperand">
+        <properties>
+            <property name="allowWhile" value="true"/>
+            <property name="allowFor" value="true"/>
+            <property name="allowIf" value="true"/>
+        </properties>
+    </rule>
+    <rule ref="category/java/errorprone.xml/AssignmentToNonFinalStatic"/>
+    <rule ref="category/java/errorprone.xml/AvoidAccessibilityAlteration"/>
+    <rule ref="category/java/errorprone.xml/AvoidAssertAsIdentifier"/>
+    <rule ref="category/java/errorprone.xml/AvoidBranchingStatementAsLastInLoop"/>
+    <rule ref="category/java/errorprone.xml/AvoidCallingFinalize"/>
+    <rule ref="category/java/errorprone.xml/AvoidCatchingThrowable"/>
+    <rule ref="category/java/errorprone.xml/AvoidDecimalLiteralsInBigDecimalConstructor"/>
+    <rule ref="category/java/errorprone.xml/AvoidDuplicateLiterals">
+        <properties>
+            <property name="skipAnnotations" value="true"/>
+        </properties>
+    </rule>
+    <rule ref="category/java/errorprone.xml/AvoidEnumAsIdentifier"/>
+    <rule ref="category/java/errorprone.xml/AvoidInstanceofChecksInCatchClause"/>
+    <rule ref="category/java/errorprone.xml/AvoidLosingExceptionInformation"/>
+    <rule ref="category/java/errorprone.xml/AvoidMultipleUnaryOperators"/>
+    <rule ref="category/java/errorprone.xml/AvoidUsingOctalValues"/>
+    <rule ref="category/java/errorprone.xml/BadComparison"/>
+    <rule ref="category/java/errorprone.xml/BrokenNullCheck"/>
+    <rule ref="category/java/errorprone.xml/CallSuperFirst"/>
+    <rule ref="category/java/errorprone.xml/CallSuperLast"/>
+    <rule ref="category/java/errorprone.xml/CheckSkipResult"/>
+    <rule ref="category/java/errorprone.xml/ClassCastExceptionWithToArray"/>
+    <rule ref="category/java/errorprone.xml/CloneMethodMustBePublic"/>
+    <rule ref="category/java/errorprone.xml/CloneMethodMustImplementCloneable"/>
+    <rule ref="category/java/errorprone.xml/CloneMethodReturnTypeMustMatchClassName"/>
+    <rule ref="category/java/errorprone.xml/CloneThrowsCloneNotSupportedException"/>
+    <rule ref="category/java/errorprone.xml/CloseResource"/>
+    <rule ref="category/java/errorprone.xml/CompareObjectsWithEquals"/>
+    <rule ref="category/java/errorprone.xml/ConstructorCallsOverridableMethod"/>>
+    <rule ref="category/java/errorprone.xml/DoNotCallGarbageCollectionExplicitly"/>
+    <rule ref="category/java/errorprone.xml/DoNotExtendJavaLangThrowable"/>
+    <rule ref="category/java/errorprone.xml/DoNotHardCodeSDCard"/>
+    <rule ref="category/java/errorprone.xml/DoNotThrowExceptionInFinally"/>
+    <rule ref="category/java/errorprone.xml/DontImportSun"/>
+    <rule ref="category/java/errorprone.xml/DontUseFloatTypeForLoopIndices"/>
+    <rule ref="category/java/errorprone.xml/EqualsNull"/>
+    <rule ref="category/java/errorprone.xml/FinalizeDoesNotCallSuperFinalize"/>
+    <rule ref="category/java/errorprone.xml/FinalizeOnlyCallsSuperFinalize"/>
+    <rule ref="category/java/errorprone.xml/FinalizeOverloaded"/>
+    <rule ref="category/java/errorprone.xml/FinalizeShouldBeProtected"/>
+    <rule ref="category/java/errorprone.xml/IdempotentOperations"/>
+    <rule ref="category/java/errorprone.xml/ImportFromSamePackage"/>
+    <rule ref="category/java/errorprone.xml/InstantiationToGetClass"/>
+    <rule ref="category/java/errorprone.xml/InvalidLogMessageFormat"/>
+    <rule ref="category/java/errorprone.xml/JumbledIncrementer"/>
+    <rule ref="category/java/errorprone.xml/JUnitSpelling"/>
+    <rule ref="category/java/errorprone.xml/JUnitStaticSuite"/>
+    <rule ref="category/java/errorprone.xml/MethodWithSameNameAsEnclosingClass"/>
+    <rule ref="category/java/errorprone.xml/MisplacedNullCheck"/>
+    <rule ref="category/java/errorprone.xml/MissingBreakInSwitch"/>
+    <rule ref="category/java/errorprone.xml/MissingSerialVersionUID"/>
+    <rule ref="category/java/errorprone.xml/MissingStaticMethodInNonInstantiatableClass"/>
+    <rule ref="category/java/errorprone.xml/MoreThanOneLogger"/>
+    <rule ref="category/java/errorprone.xml/NonCaseLabelInSwitchStatement"/>
+    <rule ref="category/java/errorprone.xml/NonStaticInitializer"/>
+    <!--    <rule ref="category/java/errorprone.xml/NullAssignment"/>-->
+    <rule ref="category/java/errorprone.xml/OverrideBothEqualsAndHashcode"/>
+    <rule ref="category/java/errorprone.xml/ProperCloneImplementation"/>
+    <rule ref="category/java/errorprone.xml/ProperLogger"/>
+    <rule ref="category/java/errorprone.xml/ReturnEmptyArrayRatherThanNull"/>
+    <rule ref="category/java/errorprone.xml/ReturnFromFinallyBlock"/>
+    <rule ref="category/java/errorprone.xml/SimpleDateFormatNeedsLocale"/>
+    <rule ref="category/java/errorprone.xml/SingleMethodSingleton"/>
+    <rule ref="category/java/errorprone.xml/SingletonClassReturningNewInstance"/>
+    <rule ref="category/java/errorprone.xml/StaticEJBFieldShouldBeFinal"/>
+    <rule ref="category/java/errorprone.xml/StringBufferInstantiationWithChar"/>
+    <rule ref="category/java/errorprone.xml/SuspiciousEqualsMethodName"/>
+    <rule ref="category/java/errorprone.xml/SuspiciousHashcodeMethodName"/>
+    <rule ref="category/java/errorprone.xml/SuspiciousOctalEscape"/>
+    <rule ref="category/java/errorprone.xml/TestClassWithoutTestCases"/>
+    <rule ref="category/java/errorprone.xml/UnconditionalIfStatement"/>
+    <rule ref="category/java/errorprone.xml/UnnecessaryBooleanAssertion"/>
+    <rule ref="category/java/errorprone.xml/UnnecessaryCaseChange"/>
+    <rule ref="category/java/errorprone.xml/UnnecessaryConversionTemporary"/>
+    <rule ref="category/java/errorprone.xml/UnusedNullCheckInEquals"/>
+    <rule ref="category/java/errorprone.xml/UseCorrectExceptionLogging"/>
+    <rule ref="category/java/errorprone.xml/UseEqualsToCompareStrings"/>
+    <rule ref="category/java/errorprone.xml/UselessOperationOnImmutable"/>
+    <rule ref="category/java/errorprone.xml/UseLocaleWithCaseConversions"/>
+    <rule ref="category/java/errorprone.xml/EmptyCatchBlock">
+        <properties>
+            <property name="allowExceptionNameRegex">
+                <value>^ignore$</value>
+            </property>
+        </properties>
+    </rule>
+    <rule ref="category/java/errorprone.xml/EmptyFinalizer"/>
+    <rule ref="category/java/errorprone.xml/EmptyFinallyBlock"/>
+    <rule ref="category/java/errorprone.xml/EmptyIfStmt"/>
+    <rule ref="category/java/errorprone.xml/EmptyInitializer"/>
+    <rule ref="category/java/errorprone.xml/EmptyStatementBlock"/>
+    <rule ref="category/java/errorprone.xml/EmptyStatementNotInLoop"/>
+    <rule ref="category/java/errorprone.xml/EmptySwitchStatements"/>
+    <rule ref="category/java/errorprone.xml/EmptySynchronizedBlock"/>
+    <rule ref="category/java/errorprone.xml/EmptyTryBlock"/>
+    <rule ref="category/java/errorprone.xml/EmptyWhileStmt"/>
+
+
+    <!-- MULTITHREADING -->
+    <rule ref="category/java/multithreading.xml/AvoidSynchronizedAtMethodLevel"/>
+    <rule ref="category/java/multithreading.xml/AvoidThreadGroup"/>
+    <rule ref="category/java/multithreading.xml/AvoidUsingVolatile"/>
+    <rule ref="category/java/multithreading.xml/DontCallThreadRun"/>
+    <rule ref="category/java/multithreading.xml/DoubleCheckedLocking"/>
+    <rule ref="category/java/multithreading.xml/NonThreadSafeSingleton"/>
+    <rule ref="category/java/multithreading.xml/UseConcurrentHashMap"/>
+    <rule ref="category/java/multithreading.xml/UseNotifyAllInsteadOfNotify"/>
+
+    <!-- PERFORMANCE -->
+    <rule ref="category/java/performance.xml/AddEmptyString"/>
+    <rule ref="category/java/performance.xml/AppendCharacterWithChar"/>
+    <rule ref="category/java/performance.xml/AvoidArrayLoops"/>
+    <rule ref="category/java/performance.xml/AvoidFileStream"/>
+    <rule ref="category/java/performance.xml/AvoidInstantiatingObjectsInLoops"/>
+    <rule ref="category/java/performance.xml/AvoidUsingShortType"/>
+    <rule ref="category/java/performance.xml/BigIntegerInstantiation"/>
+    <rule ref="category/java/performance.xml/BooleanInstantiation"/>
+    <rule ref="category/java/performance.xml/ByteInstantiation"/>
+    <rule ref="category/java/performance.xml/ConsecutiveAppendsShouldReuse"/>
+    <rule ref="category/java/performance.xml/ConsecutiveLiteralAppends"/>
+    <rule ref="category/java/performance.xml/InefficientEmptyStringCheck"/>
+    <rule ref="category/java/performance.xml/InefficientStringBuffering"/>
+    <rule ref="category/java/performance.xml/InsufficientStringBufferDeclaration"/>
+    <rule ref="category/java/performance.xml/IntegerInstantiation"/>
+    <rule ref="category/java/performance.xml/LongInstantiation"/>
+    <rule ref="category/java/performance.xml/OptimizableToArrayCall"/>
+    <rule ref="category/java/performance.xml/RedundantFieldInitializer"/>
+    <rule ref="category/java/performance.xml/SimplifyStartsWith"/>
+    <rule ref="category/java/performance.xml/ShortInstantiation"/>
+    <rule ref="category/java/performance.xml/StringInstantiation"/>
+    <rule ref="category/java/performance.xml/StringToString"/>
+    <rule ref="category/java/performance.xml/TooFewBranchesForASwitchStatement"/>
+    <rule ref="category/java/performance.xml/UnnecessaryWrapperObjectCreation"/>
+    <!-- <rule ref="category/java/performance.xml/UseArrayListInsteadOfVector"/> -->
+    <rule ref="category/java/performance.xml/UseArraysAsList"/>
+    <rule ref="category/java/performance.xml/UseIndexOfChar"/>
+    <rule ref="category/java/performance.xml/UselessStringValueOf"/>
+    <rule ref="category/java/performance.xml/UseStringBufferForStringAppends"/>
+    <rule ref="category/java/performance.xml/UseStringBufferLength"/>
+
+    <!-- SECURITY -->
+    <rule ref="category/java/security.xml/HardCodedCryptoKey"/>
+    <rule ref="category/java/security.xml/InsecureCryptoIv"/>
+</ruleset>
diff --git a/config/spotbugs/excludeFilter.xml b/config/spotbugs/excludeFilter.xml
new file mode 100644
index 0000000..ddb2db1
--- /dev/null
+++ b/config/spotbugs/excludeFilter.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<FindBugsFilter
+        xmlns="https://github.com/spotbugs/filter/3.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="https://github.com/spotbugs/filter/3.0.0 https://raw.githubusercontent.com/spotbugs/spotbugs/3.1.0/spotbugs/etc/findbugsfilter.xsd">
+    <!--    <Match>
+            <Package name="com.foobar.*"/>
+            <Class name="com.foobar.MyClass"/>
+            <Or>
+                <Method name="someMethod"/>
+                <Method name="someOtherMethod"/>
+            </Or>
+            <Bug pattern="DLS_DEAD_LOCAL_STORE"/>
+            <Confidence value="2"/>
+        </Match>-->
+</FindBugsFilter>