diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..898cd15
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.idea
+out
+build
+.gradle
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..12e8584
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,8 @@
+language: java
+deploy:
+  provider: releases
+  api_key:
+    secure: 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
+  file: build/libs/*
+  on:
+    tags: true
\ No newline at end of file
diff --git a/README.MD b/README.MD
new file mode 100644
index 0000000..163912b
--- /dev/null
+++ b/README.MD
@@ -0,0 +1,3 @@
+Whatswrong validator
+
+[![Build Status](https://travis-ci.org/eduardoschmidtsantos/whatswrong.svg?branch=master)](https://travis-ci.org/eduardoschmidtsantos/whatswrong)
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..17cab59
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,14 @@
+apply plugin: 'java'
+
+group 'com.whatswrong'
+version '1.0-SNAPSHOT'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..01b8bf6
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..739af35
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Thu May 24 16:56:57 BRT 2018
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..cccdd3d
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..e95643d
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..df4a9de
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'whatswrong'
+
diff --git a/src/main/java/demo/Demo.java b/src/main/java/demo/Demo.java
new file mode 100644
index 0000000..a60d65c
--- /dev/null
+++ b/src/main/java/demo/Demo.java
@@ -0,0 +1,44 @@
+package demo;
+
+import java.util.List;
+
+
+public class Demo {
+
+    private Integer number;
+    private String word;
+    private Object object;
+    private List<Object> objects;
+
+    public Integer getNumber() {
+        return number;
+    }
+
+    public void setNumber(Integer number) {
+        this.number = number;
+    }
+
+    public String getWord() {
+        return word;
+    }
+
+    public void setWord(String word) {
+        this.word = word;
+    }
+
+    public Object getObject() {
+        return object;
+    }
+
+    public void setObject(Object object) {
+        this.object = object;
+    }
+
+    public List<Object> getObjects() {
+        return objects;
+    }
+
+    public void setObjects(List<Object> objects) {
+        this.objects = objects;
+    }
+}
diff --git a/src/main/java/demo/DemoValidator.java b/src/main/java/demo/DemoValidator.java
new file mode 100644
index 0000000..79c1f0b
--- /dev/null
+++ b/src/main/java/demo/DemoValidator.java
@@ -0,0 +1,24 @@
+package demo;
+
+import validation.Rules;
+import validation.ValidationCondiction;
+import validation.Validations;
+import validation.Validator;
+
+public class DemoValidator implements Validator<Demo> {
+
+    public static final int MAX_LENGTH = 100;
+
+    @Override
+    public void validate(Demo demo) {
+        Validations.start()
+            .add(Rules.notNull(demo.getWord(), "NOT NULL"))
+            .add(Rules.notEmpty(demo.getWord(), "NOT EMPTY"))
+            .add(Rules.maxLength(demo.getWord(), MAX_LENGTH, "MAX LENGTH"))
+            .add(Rules.greaterThan(demo.getNumber(), MAX_LENGTH, "GREATER THEN"))
+            .add(ValidationCondiction.create(demo.getNumber() > 0).validate(Rules.notNull(demo.getObject(), "CONDICTIONAL")))
+            .add(Rules.custom(demo, (object) -> demo.getNumber() > 0, "CUSTOM"))
+            .evaluateAndThrows();
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/exception/ValidationException.java b/src/main/java/exception/ValidationException.java
new file mode 100644
index 0000000..3388831
--- /dev/null
+++ b/src/main/java/exception/ValidationException.java
@@ -0,0 +1,27 @@
+package exception;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class ValidationException extends RuntimeException {
+
+    private List<String> messages;
+
+    public ValidationException(List<String> messages) {
+        this.messages = messages;
+    }
+
+    public ValidationException(String message) {
+        this.messages = Arrays.asList(message);
+    }
+
+    public List<String> getMessages() {
+        return messages;
+    }
+
+    @Override
+    public String getMessage() {
+        return String.valueOf(messages);
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/validation/CollectionNotEmptyValidation.java b/src/main/java/validation/CollectionNotEmptyValidation.java
new file mode 100644
index 0000000..997948b
--- /dev/null
+++ b/src/main/java/validation/CollectionNotEmptyValidation.java
@@ -0,0 +1,12 @@
+package validation;
+
+import java.util.Collection;
+
+public class CollectionNotEmptyValidation implements Validation<Collection<?>> {
+
+    @Override
+    public boolean isInvalid(Collection<?> value) {
+        return value == null || value.isEmpty();
+    }
+
+}
diff --git a/src/main/java/validation/CustomValidation.java b/src/main/java/validation/CustomValidation.java
new file mode 100644
index 0000000..00a5cdb
--- /dev/null
+++ b/src/main/java/validation/CustomValidation.java
@@ -0,0 +1,8 @@
+package validation;
+
+public abstract class CustomValidation<T> implements Validation<T> {
+
+    @Override
+    public abstract boolean isInvalid(T value);
+
+}
diff --git a/src/main/java/validation/IntegerGreaterThanValidation.java b/src/main/java/validation/IntegerGreaterThanValidation.java
new file mode 100644
index 0000000..35142f0
--- /dev/null
+++ b/src/main/java/validation/IntegerGreaterThanValidation.java
@@ -0,0 +1,16 @@
+package validation;
+
+public class IntegerGreaterThanValidation implements Validation<Integer> {
+
+    private Integer minValue;
+
+    public IntegerGreaterThanValidation(Integer minValue) {
+        this.minValue = minValue;
+    }
+
+    @Override
+    public boolean isInvalid(Integer value) {
+        return value != null && value <= minValue;
+    }
+
+}
diff --git a/src/main/java/validation/MaxLengthValidation.java b/src/main/java/validation/MaxLengthValidation.java
new file mode 100644
index 0000000..7ab6440
--- /dev/null
+++ b/src/main/java/validation/MaxLengthValidation.java
@@ -0,0 +1,16 @@
+package validation;
+
+public class MaxLengthValidation implements Validation<String> {
+
+    private Integer maxLength;
+
+    public MaxLengthValidation(Integer maxLength) {
+        this.maxLength = maxLength;
+    }
+
+    @Override
+    public boolean isInvalid(String value) {
+        return value != null && value.length() > maxLength;
+    }
+
+}
diff --git a/src/main/java/validation/NotEmptyValidation.java b/src/main/java/validation/NotEmptyValidation.java
new file mode 100644
index 0000000..4d05f3f
--- /dev/null
+++ b/src/main/java/validation/NotEmptyValidation.java
@@ -0,0 +1,10 @@
+package validation;
+
+public class NotEmptyValidation implements Validation<String> {
+
+    @Override
+    public boolean isInvalid(String value) {
+        return value == null || value.trim().isEmpty();
+    }
+
+}
diff --git a/src/main/java/validation/NotNullValidation.java b/src/main/java/validation/NotNullValidation.java
new file mode 100644
index 0000000..1f103cb
--- /dev/null
+++ b/src/main/java/validation/NotNullValidation.java
@@ -0,0 +1,10 @@
+package validation;
+
+public class NotNullValidation implements Validation<Object> {
+
+    @Override
+    public boolean isInvalid(Object value) {
+        return value == null;
+    }
+
+}
diff --git a/src/main/java/validation/Rules.java b/src/main/java/validation/Rules.java
new file mode 100644
index 0000000..bd835d9
--- /dev/null
+++ b/src/main/java/validation/Rules.java
@@ -0,0 +1,34 @@
+package validation;
+
+import validation.*;
+
+import java.util.Collection;
+
+public class Rules {
+
+    private Rules() {}
+
+    public static ValidationRule notNull(Object value, String message) {
+        return new ValidationRule(value, new NotNullValidation(), message);
+    }
+
+    public static ValidationRule notEmpty(String value, String message) {
+        return new ValidationRule(value, new NotEmptyValidation(), message);
+    }
+
+    public static ValidationRule notEmpty(Collection<?> value, String message) {
+        return new ValidationRule(value, new CollectionNotEmptyValidation(), message);
+    }
+
+    public static ValidationRule maxLength(String value, Integer maxLength, String message) {
+        return new ValidationRule(value, new MaxLengthValidation(maxLength), message);
+    }
+
+    public static ValidationRule greaterThan(Integer value, Integer minValue, String message) {
+        return new ValidationRule(value, new IntegerGreaterThanValidation(minValue), message);
+    }
+
+    public static ValidationRule custom(Object value, Validation validation, String message) {
+        return new ValidationRule(value, validation, message);
+    }
+}
diff --git a/src/main/java/validation/Validation.java b/src/main/java/validation/Validation.java
new file mode 100644
index 0000000..7d5f8d4
--- /dev/null
+++ b/src/main/java/validation/Validation.java
@@ -0,0 +1,7 @@
+package validation;
+
+public interface Validation<T> {
+
+    boolean isInvalid(T value);
+
+}
diff --git a/src/main/java/validation/ValidationBuilder.java b/src/main/java/validation/ValidationBuilder.java
new file mode 100644
index 0000000..856e029
--- /dev/null
+++ b/src/main/java/validation/ValidationBuilder.java
@@ -0,0 +1,38 @@
+package validation;
+
+import exception.ValidationException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ValidationBuilder {
+
+    private List<ValidationRule> rules = new ArrayList();
+
+    public ValidationBuilder add(ValidationRule rule) {
+        rules.add(rule);
+        return this;
+    }
+
+    public ValidationBuilder add(List<ValidationRule> rule) {
+        rules.addAll(rule);
+        return this;
+    }
+
+    public List<String> evaluate() {
+        List<String> messages = new ArrayList<>();
+        for (ValidationRule rule : rules) {
+            if (rule.getValidation().isInvalid(rule.getValue())) {
+                messages.add(rule.getMessage());
+            }
+        }
+        return messages;
+    }
+
+    public void evaluateAndThrows() {
+        List<String> messages = evaluate();
+        if (!messages.isEmpty()) {
+            throw new ValidationException(messages);
+        }
+    }
+
+}
diff --git a/src/main/java/validation/ValidationCondiction.java b/src/main/java/validation/ValidationCondiction.java
new file mode 100644
index 0000000..907e9b9
--- /dev/null
+++ b/src/main/java/validation/ValidationCondiction.java
@@ -0,0 +1,36 @@
+package validation;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by eduardo on 09/12/16.
+ */
+public class ValidationCondiction {
+
+    List<ValidationRule> rules = new ArrayList<>();
+    boolean condiction;
+
+    public ValidationCondiction(boolean condiction){
+        this.condiction = condiction;
+    }
+
+    public List<ValidationRule> validate(ValidationRule validationRule) {
+        if(condiction){
+           rules.add(validationRule);
+        }
+        return rules;
+    }
+
+    public List<ValidationRule> validate(List<ValidationRule> validationRule) {
+        if(condiction){
+            rules.addAll(validationRule);
+        }
+        return rules;
+    }
+
+    public static ValidationCondiction create(boolean condiction){
+        return new ValidationCondiction(condiction);
+    }
+
+}
diff --git a/src/main/java/validation/ValidationRule.java b/src/main/java/validation/ValidationRule.java
new file mode 100644
index 0000000..f4e733c
--- /dev/null
+++ b/src/main/java/validation/ValidationRule.java
@@ -0,0 +1,29 @@
+package validation;
+
+import validation.Validation;
+
+public class ValidationRule<T> {
+
+    private T value;
+    private Validation<T> validation;
+    private String message;
+
+    public ValidationRule(T value, Validation<T> validation, String message) {
+        this.value = value;
+        this.validation = validation;
+        this.message = message;
+    }
+
+    public T getValue() {
+        return value;
+    }
+
+    public Validation<T> getValidation() {
+        return validation;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+}
diff --git a/src/main/java/validation/Validations.java b/src/main/java/validation/Validations.java
new file mode 100644
index 0000000..4bb8bcf
--- /dev/null
+++ b/src/main/java/validation/Validations.java
@@ -0,0 +1,13 @@
+package validation;
+
+import validation.ValidationBuilder;
+
+public class Validations {
+
+    private Validations() {}
+
+    public static ValidationBuilder start() {
+        return new ValidationBuilder();
+    }
+
+}
diff --git a/src/main/java/validation/Validator.java b/src/main/java/validation/Validator.java
new file mode 100644
index 0000000..71a336d
--- /dev/null
+++ b/src/main/java/validation/Validator.java
@@ -0,0 +1,5 @@
+package validation;
+
+public interface Validator<T> {
+    void validate(T value);
+}