diff --git a/src/main/java/com/bartek/esa/EsaMain.java b/src/main/java/com/bartek/esa/EsaMain.java
index c9ea10c..aab71b6 100644
--- a/src/main/java/com/bartek/esa/EsaMain.java
+++ b/src/main/java/com/bartek/esa/EsaMain.java
@@ -4,7 +4,6 @@ import com.bartek.esa.analyser.apk.ApkAnalyser;
 import com.bartek.esa.analyser.source.SourceAnalyser;
 import com.bartek.esa.cli.model.CliArgsOptions;
 import com.bartek.esa.cli.parser.CliArgsParser;
-import com.bartek.esa.core.model.enumeration.Severity;
 import com.bartek.esa.core.model.object.Issue;
 import com.bartek.esa.di.DaggerDependencyInjector;
 import com.bartek.esa.dispatcher.dispatcher.MethodDispatcher;
@@ -12,7 +11,7 @@ import com.bartek.esa.dispatcher.model.DispatcherActions;
 import com.bartek.esa.formatter.provider.FormatterProvider;
 
 import javax.inject.Inject;
-import java.util.List;
+import java.util.Set;
 
 public class EsaMain {
     private final CliArgsParser cliArgsParser;
@@ -37,14 +36,14 @@ public class EsaMain {
                 .build();
 
         CliArgsOptions options = cliArgsParser.parse(args);
-        List<Issue> issues = methodDispatcher.dispatchMethod(options, dispatcherActions);
+        Set<Issue> issues = methodDispatcher.dispatchMethod(options, dispatcherActions);
         formatterProvider.provide(options).format(issues);
 
         exitWithErrorIfAnyIssueIsAnError(issues);
     }
 
-    private void exitWithErrorIfAnyIssueIsAnError(List<Issue> issues) {
-        if(issues.stream().anyMatch(i -> i.getSeverity() == Severity.ERROR)) {
+    private void exitWithErrorIfAnyIssueIsAnError(Set<Issue> issues) {
+        if(issues.stream().anyMatch(i -> i.getSeverity().isExitWithError())) {
             System.exit(1);
         }
     }
diff --git a/src/main/java/com/bartek/esa/analyser/apk/ApkAnalyser.java b/src/main/java/com/bartek/esa/analyser/apk/ApkAnalyser.java
index 2dae5f3..67dca4a 100644
--- a/src/main/java/com/bartek/esa/analyser/apk/ApkAnalyser.java
+++ b/src/main/java/com/bartek/esa/analyser/apk/ApkAnalyser.java
@@ -4,6 +4,9 @@ import com.bartek.esa.analyser.core.Analyser;
 import com.bartek.esa.core.archetype.Plugin;
 import com.bartek.esa.core.executor.PluginExecutor;
 import com.bartek.esa.decompiler.decompiler.Decompiler;
+import com.bartek.esa.error.EsaException;
+import com.bartek.esa.file.cleaner.FileCleaner;
+import com.bartek.esa.file.matcher.GlobMatcher;
 import com.bartek.esa.file.provider.FileProvider;
 
 import java.io.File;
@@ -15,17 +18,29 @@ public class ApkAnalyser extends Analyser {
     private static final String LAYOUT_GLOB = "**/" + Decompiler.XML_FILES_DIR + "/**/layout*/*.xml";
 
     private final Decompiler decompiler;
+    private final FileCleaner fileCleaner;
+    private final GlobMatcher globMatcher;
 
-    public ApkAnalyser(PluginExecutor pluginExecutor, Set<Plugin> plugins, FileProvider fileProvider, Decompiler decompiler) {
+    public ApkAnalyser(PluginExecutor pluginExecutor, Set<Plugin> plugins, FileProvider fileProvider, Decompiler decompiler, FileCleaner fileCleaner, GlobMatcher globMatcher) {
         super(pluginExecutor, plugins, fileProvider);
         this.decompiler = decompiler;
+        this.fileCleaner = fileCleaner;
+        this.globMatcher = globMatcher;
     }
 
     @Override
     protected String prepareSources(String source) {
+        checkIfSourceIsApkFile(source);
+        System.out.println("Decompiling APK...");
         return decompiler.decompile(new File(source)).getAbsolutePath();
     }
 
+    private void checkIfSourceIsApkFile(String source) {
+        if (!globMatcher.fileMatchesGlobPattern(new File(source), "**/*.apk")) {
+            throw new EsaException("Provided source is not *.apk file. Interrupting...");
+        }
+    }
+
     @Override
     protected String getAndroidManifestGlob() {
         return ANDROID_MANIFEST_GLOB;
@@ -40,4 +55,9 @@ public class ApkAnalyser extends Analyser {
     protected String getLayoutGlob() {
         return LAYOUT_GLOB;
     }
+
+    @Override
+    protected void performCleaning(String source) {
+        fileCleaner.deleteRecursively(new File(source));
+    }
 }
diff --git a/src/main/java/com/bartek/esa/analyser/core/Analyser.java b/src/main/java/com/bartek/esa/analyser/core/Analyser.java
index 0f3eb4c..a4ba6b6 100644
--- a/src/main/java/com/bartek/esa/analyser/core/Analyser.java
+++ b/src/main/java/com/bartek/esa/analyser/core/Analyser.java
@@ -8,7 +8,6 @@ import com.bartek.esa.file.provider.FileProvider;
 
 import java.io.File;
 import java.util.Collections;
-import java.util.List;
 import java.util.Set;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -25,13 +24,15 @@ public abstract class Analyser {
         this.fileProvider = fileProvider;
     }
 
-    public List<Issue> analyse(String source, Set<String> pluginCodes, Set<String> excludeCodes) {
+    public Set<Issue> analyse(String source, Set<String> pluginCodes, Set<String> excludeCodes) {
         String newSource = prepareSources(source);
         File manifest = getManifest(newSource);
         Set<File> files = getFiles(newSource);
         Set<Plugin> selectedPlugins = getPlugins(pluginCodes, excludeCodes);
 
-        return pluginExecutor.executeForFiles(manifest, files, selectedPlugins);
+        Set<Issue> issues = pluginExecutor.executeForFiles(manifest, files, selectedPlugins);
+        performCleaning(newSource);
+        return issues;
     }
 
     protected abstract String prepareSources(String source);
@@ -42,6 +43,8 @@ public abstract class Analyser {
 
     protected abstract String getLayoutGlob();
 
+    protected abstract void performCleaning(String source);
+
 
     private File getManifest(String source) {
         Set<File> manifests = fileProvider.getGlobMatchedFiles(source, getAndroidManifestGlob());
diff --git a/src/main/java/com/bartek/esa/analyser/di/AnalyserModule.java b/src/main/java/com/bartek/esa/analyser/di/AnalyserModule.java
index 3087dd5..f977f89 100644
--- a/src/main/java/com/bartek/esa/analyser/di/AnalyserModule.java
+++ b/src/main/java/com/bartek/esa/analyser/di/AnalyserModule.java
@@ -5,6 +5,8 @@ import com.bartek.esa.analyser.source.SourceAnalyser;
 import com.bartek.esa.core.archetype.Plugin;
 import com.bartek.esa.core.executor.PluginExecutor;
 import com.bartek.esa.decompiler.decompiler.Decompiler;
+import com.bartek.esa.file.cleaner.FileCleaner;
+import com.bartek.esa.file.matcher.GlobMatcher;
 import com.bartek.esa.file.provider.FileProvider;
 import dagger.Module;
 import dagger.Provides;
@@ -20,7 +22,7 @@ public class AnalyserModule {
     }
 
    @Provides
-    public ApkAnalyser apkAnalyser(PluginExecutor pluginExecutor, Set<Plugin> plugins, FileProvider fileProvider, Decompiler decompiler) {
-        return new ApkAnalyser(pluginExecutor, plugins, fileProvider, decompiler);
+    public ApkAnalyser apkAnalyser(PluginExecutor pluginExecutor, Set<Plugin> plugins, FileProvider fileProvider, Decompiler decompiler, FileCleaner fileCleaner, GlobMatcher globMatcher) {
+        return new ApkAnalyser(pluginExecutor, plugins, fileProvider, decompiler, fileCleaner, globMatcher);
     }
 }
diff --git a/src/main/java/com/bartek/esa/analyser/source/SourceAnalyser.java b/src/main/java/com/bartek/esa/analyser/source/SourceAnalyser.java
index 6374ee9..97a9fed 100644
--- a/src/main/java/com/bartek/esa/analyser/source/SourceAnalyser.java
+++ b/src/main/java/com/bartek/esa/analyser/source/SourceAnalyser.java
@@ -3,8 +3,10 @@ package com.bartek.esa.analyser.source;
 import com.bartek.esa.analyser.core.Analyser;
 import com.bartek.esa.core.archetype.Plugin;
 import com.bartek.esa.core.executor.PluginExecutor;
+import com.bartek.esa.error.EsaException;
 import com.bartek.esa.file.provider.FileProvider;
 
+import java.io.File;
 import java.util.Set;
 
 public class SourceAnalyser extends Analyser {
@@ -18,9 +20,16 @@ public class SourceAnalyser extends Analyser {
 
     @Override
     protected String prepareSources(String source) {
+        checkIfSourceIsDirectory(source);
         return source;
     }
 
+    private void checkIfSourceIsDirectory(String source) {
+        if (!new File(source).isDirectory()) {
+            throw new EsaException("Provided source is not a directory. Interrupting...");
+        }
+    }
+
     @Override
     protected String getAndroidManifestGlob() {
         return ANDROID_MANIFEST_GLOB;
@@ -35,4 +44,9 @@ public class SourceAnalyser extends Analyser {
     protected String getLayoutGlob() {
         return LAYOUT_GLOB;
     }
+
+    @Override
+    protected void performCleaning(String source) {
+        // do nothing
+    }
 }
diff --git a/src/main/java/com/bartek/esa/core/archetype/BasePlugin.java b/src/main/java/com/bartek/esa/core/archetype/BasePlugin.java
index 391ac16..fbcd814 100644
--- a/src/main/java/com/bartek/esa/core/archetype/BasePlugin.java
+++ b/src/main/java/com/bartek/esa/core/archetype/BasePlugin.java
@@ -5,11 +5,11 @@ import com.bartek.esa.core.model.object.Issue;
 import org.w3c.dom.Document;
 
 import java.io.File;
-import java.util.ArrayList;
-import java.util.List;
+import java.util.HashSet;
+import java.util.Set;
 
 public abstract class BasePlugin implements Plugin {
-    private List<Issue> issues = new ArrayList<>();
+    private Set<Issue> issues = new HashSet<>();
     private Document manifest;
     private File file;
 
@@ -21,7 +21,7 @@ public abstract class BasePlugin implements Plugin {
     }
 
     @Override
-    public List<Issue> runForIssues() {
+    public Set<Issue> runForIssues() {
         run(file);
         return issues;
     }
@@ -45,6 +45,10 @@ public abstract class BasePlugin implements Plugin {
         issues.add(issue);
     }
 
+    protected void addIssue(Issue issue) {
+        issues.add(issue);
+    }
+
     protected File getOriginalFile() {
         return file;
     }
diff --git a/src/main/java/com/bartek/esa/core/archetype/JavaPlugin.java b/src/main/java/com/bartek/esa/core/archetype/JavaPlugin.java
index d617c13..b438f82 100644
--- a/src/main/java/com/bartek/esa/core/archetype/JavaPlugin.java
+++ b/src/main/java/com/bartek/esa/core/archetype/JavaPlugin.java
@@ -1,6 +1,7 @@
 package com.bartek.esa.core.archetype;
 
 import com.bartek.esa.core.model.enumeration.Severity;
+import com.bartek.esa.core.model.object.Issue;
 import com.bartek.esa.core.xml.XmlHelper;
 import com.bartek.esa.error.EsaException;
 import com.bartek.esa.file.matcher.GlobMatcher;
@@ -43,7 +44,14 @@ public abstract class JavaPlugin extends BasePlugin {
         Node packageValue = root.getAttributes().getNamedItem("package");
 
         if(packageValue == null) {
-            addIssue(Severity.ERROR, ".PACKAGE_LACK", null, null);
+            Issue issue = Issue.builder()
+                    .issuer(JavaPlugin.class)
+                    .descriptionCode(".NO_PACKAGE")
+                    .severity(Severity.ERROR)
+                    .build();
+
+            addIssue(issue);
+
             return false;
         }
 
diff --git a/src/main/java/com/bartek/esa/core/archetype/Plugin.java b/src/main/java/com/bartek/esa/core/archetype/Plugin.java
index ddbf1d4..ffbd990 100644
--- a/src/main/java/com/bartek/esa/core/archetype/Plugin.java
+++ b/src/main/java/com/bartek/esa/core/archetype/Plugin.java
@@ -4,10 +4,10 @@ import com.bartek.esa.core.model.object.Issue;
 import org.w3c.dom.Document;
 
 import java.io.File;
-import java.util.List;
+import java.util.Set;
 
 public interface Plugin {
     boolean supports(File file);
     void update(File file, Document manifest);
-    List<Issue> runForIssues();
+    Set<Issue> runForIssues();
 }
diff --git a/src/main/java/com/bartek/esa/core/executor/PluginExecutor.java b/src/main/java/com/bartek/esa/core/executor/PluginExecutor.java
index 10d0041..3560e12 100644
--- a/src/main/java/com/bartek/esa/core/executor/PluginExecutor.java
+++ b/src/main/java/com/bartek/esa/core/executor/PluginExecutor.java
@@ -7,10 +7,9 @@ import org.w3c.dom.Document;
 
 import javax.inject.Inject;
 import java.io.File;
-import java.util.List;
 import java.util.Set;
 
-import static java.util.stream.Collectors.toList;
+import static java.util.stream.Collectors.toSet;
 
 public class PluginExecutor {
     private final XmlHelper xmlHelper;
@@ -20,20 +19,20 @@ public class PluginExecutor {
         this.xmlHelper = xmlHelper;
     }
 
-    public List<Issue> executeForFiles(File manifest, Set<File> files, Set<Plugin> plugins) {
+    public Set<Issue> executeForFiles(File manifest, Set<File> files, Set<Plugin> plugins) {
         return files.stream()
                 .map(file -> executeForFile(manifest, file, plugins))
-                .flatMap(List::stream)
-                .collect(toList());
+                .flatMap(Set::stream)
+                .collect(toSet());
     }
 
-    private List<Issue> executeForFile(File manifest, File file, Set<Plugin> plugins) {
+    private Set<Issue> executeForFile(File manifest, File file, Set<Plugin> plugins) {
         Document xmlManifest = xmlHelper.parseXml(manifest);
         return plugins.stream()
                 .peek(plugin -> plugin.update(file, xmlManifest))
                 .filter(plugin -> plugin.supports(file))
                 .map(Plugin::runForIssues)
-                .flatMap(List::stream)
-                .collect(toList());
+                .flatMap(Set::stream)
+                .collect(toSet());
     }
 }
diff --git a/src/main/java/com/bartek/esa/core/model/enumeration/Severity.java b/src/main/java/com/bartek/esa/core/model/enumeration/Severity.java
index 78b81ea..81dfd5f 100644
--- a/src/main/java/com/bartek/esa/core/model/enumeration/Severity.java
+++ b/src/main/java/com/bartek/esa/core/model/enumeration/Severity.java
@@ -1,6 +1,17 @@
 package com.bartek.esa.core.model.enumeration;
 
+import lombok.Getter;
+
+@Getter
 public enum Severity {
-    WARNING,
-    ERROR
+    INFO(false),
+    WARNING(false),
+    ERROR(true),
+    VULNERABILITY(true);
+
+    private final boolean exitWithError;
+
+    Severity(boolean exitWithError) {
+        this.exitWithError = exitWithError;
+    }
 }
diff --git a/src/main/java/com/bartek/esa/dispatcher/dispatcher/MethodDispatcher.java b/src/main/java/com/bartek/esa/dispatcher/dispatcher/MethodDispatcher.java
index 3dc20b4..5b00209 100644
--- a/src/main/java/com/bartek/esa/dispatcher/dispatcher/MethodDispatcher.java
+++ b/src/main/java/com/bartek/esa/dispatcher/dispatcher/MethodDispatcher.java
@@ -6,7 +6,7 @@ import com.bartek.esa.dispatcher.model.DispatcherActions;
 
 import javax.inject.Inject;
 import java.util.Collections;
-import java.util.List;
+import java.util.Set;
 
 public class MethodDispatcher {
 
@@ -15,7 +15,7 @@ public class MethodDispatcher {
 
     }
 
-    public List<Issue> dispatchMethod(CliArgsOptions options, DispatcherActions actions) {
+    public Set<Issue> dispatchMethod(CliArgsOptions options, DispatcherActions actions) {
         if(options.isSourceAnalysis()) {
             return actions.getSourceAnalysis().perform(
                     options.getSourceAnalysisDirectory(),
@@ -32,6 +32,6 @@ public class MethodDispatcher {
             );
         }
 
-        return Collections.emptyList();
+        return Collections.emptySet();
     }
 }
diff --git a/src/main/java/com/bartek/esa/dispatcher/model/Action.java b/src/main/java/com/bartek/esa/dispatcher/model/Action.java
index b7ba664..cf5af89 100644
--- a/src/main/java/com/bartek/esa/dispatcher/model/Action.java
+++ b/src/main/java/com/bartek/esa/dispatcher/model/Action.java
@@ -2,11 +2,10 @@ package com.bartek.esa.dispatcher.model;
 
 import com.bartek.esa.core.model.object.Issue;
 
-import java.util.List;
 import java.util.Set;
 
 @FunctionalInterface
 public interface Action {
 
-    List<Issue> perform(String source, Set<String> plugins, Set<String> excludes);
+    Set<Issue> perform(String source, Set<String> plugins, Set<String> excludes);
 }
diff --git a/src/main/java/com/bartek/esa/formatter/archetype/Formatter.java b/src/main/java/com/bartek/esa/formatter/archetype/Formatter.java
index cac7e43..a84e644 100644
--- a/src/main/java/com/bartek/esa/formatter/archetype/Formatter.java
+++ b/src/main/java/com/bartek/esa/formatter/archetype/Formatter.java
@@ -2,8 +2,8 @@ package com.bartek.esa.formatter.archetype;
 
 import com.bartek.esa.core.model.object.Issue;
 
-import java.util.List;
+import java.util.Set;
 
 public interface Formatter {
-    void format(List<Issue> issues);
+    void format(Set<Issue> issues);
 }
diff --git a/src/main/java/com/bartek/esa/formatter/formatter/ColorFormatter.java b/src/main/java/com/bartek/esa/formatter/formatter/ColorFormatter.java
index fdae927..34ee131 100644
--- a/src/main/java/com/bartek/esa/formatter/formatter/ColorFormatter.java
+++ b/src/main/java/com/bartek/esa/formatter/formatter/ColorFormatter.java
@@ -7,8 +7,9 @@ import org.fusesource.jansi.Ansi;
 import org.fusesource.jansi.AnsiConsole;
 
 import javax.inject.Inject;
-import java.util.List;
+import java.util.Arrays;
 import java.util.Optional;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 import static org.fusesource.jansi.Ansi.Color.*;
@@ -24,9 +25,9 @@ public class ColorFormatter implements Formatter {
     }
 
     @Override
-    public void format(List<Issue> issues) {
+    public void format(Set<Issue> issues) {
         AnsiConsole.systemInstall();
-        if(issues.isEmpty()) {
+        if (issues.isEmpty()) {
             Ansi noIssuesFound = ansi().fg(GREEN).a("No issues found.").reset();
             System.out.println(noIssuesFound);
             return;
@@ -52,29 +53,36 @@ public class ColorFormatter implements Formatter {
 
     private Ansi appendDescription(Issue issue, Ansi ansi) {
         String description = descriptionProvider.getDescriptionForIssue(issue);
+        String[] lines = description.split("\n");
+        String firstLine = lines[0];
+        String theRestOfLines = lines.length > 1 ? "\n" + String.join("\n", Arrays.copyOfRange(lines, 1, lines.length)) : "";
 
         return ansi
                 .fg(getColorForSeverity(issue))
                 .a(issue.getSeverity().name())
                 .reset()
-                .a(": ").a(description)
+                .a(": ").a(firstLine)
+                .fgBrightBlack().a(theRestOfLines)
+                .reset()
                 .a("\n");
     }
 
     private Ansi appendFile(Issue issue, Ansi ansi) {
-        return ansi
-                .fg(GREEN)
-                .a("File: ")
-                .reset()
-                .a(issue.getFile().getAbsolutePath())
-                .a("\n");
+        return Optional.ofNullable(issue.getFile())
+                .map(file -> ansi
+                        .fg(BLUE)
+                        .a("File: ")
+                        .reset()
+                        .a(file.getAbsolutePath())
+                        .a("\n"))
+                .orElse(ansi);
     }
 
     private Ansi appendLine(Issue issue, Ansi ansi) {
         Optional.ofNullable(issue.getLine())
                 .ifPresent(line -> {
                     ansi
-                            .fg(BLUE)
+                            .fg(CYAN)
                             .a("Line");
                     Optional.ofNullable(issue.getLineNumber()).ifPresentOrElse(
                             number -> ansi.a(" ").a(number).a(": "),
@@ -86,9 +94,15 @@ public class ColorFormatter implements Formatter {
     }
 
     private Ansi.Color getColorForSeverity(Issue issue) {
-        switch(issue.getSeverity()) {
-            case WARNING: return YELLOW;
-            case ERROR: return RED;
+        switch (issue.getSeverity()) {
+            case INFO:
+                return GREEN;
+            case WARNING:
+                return YELLOW;
+            case ERROR:
+                return MAGENTA;
+            case VULNERABILITY:
+                return RED;
         }
 
         return RED;
diff --git a/src/main/java/com/bartek/esa/formatter/formatter/SimpleFormatter.java b/src/main/java/com/bartek/esa/formatter/formatter/SimpleFormatter.java
index 606da51..aae9181 100644
--- a/src/main/java/com/bartek/esa/formatter/formatter/SimpleFormatter.java
+++ b/src/main/java/com/bartek/esa/formatter/formatter/SimpleFormatter.java
@@ -5,8 +5,8 @@ import com.bartek.esa.core.model.object.Issue;
 import com.bartek.esa.formatter.archetype.Formatter;
 
 import javax.inject.Inject;
-import java.util.List;
 import java.util.Optional;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 public class SimpleFormatter implements Formatter {
@@ -18,8 +18,8 @@ public class SimpleFormatter implements Formatter {
     }
 
     @Override
-    public void format(List<Issue> issues) {
-        if(issues.isEmpty()) {
+    public void format(Set<Issue> issues) {
+        if (issues.isEmpty()) {
             System.out.println("No issues found.");
             return;
         }
@@ -50,10 +50,13 @@ public class SimpleFormatter implements Formatter {
     }
 
     private void appendFile(Issue issue, StringBuilder format) {
-        format
-                .append("File: ")
-                .append(issue.getFile().getAbsolutePath())
-                .append("\n");
+        Optional.ofNullable(issue.getFile())
+                .ifPresent(file ->
+                        format
+                                .append("File: ")
+                                .append(file.getAbsolutePath())
+                                .append("\n")
+                );
     }
 
     private void appendLine(Issue issue, StringBuilder format) {
diff --git a/src/main/resources/description.properties b/src/main/resources/description.properties
index 39d333c..7efa949 100644
--- a/src/main/resources/description.properties
+++ b/src/main/resources/description.properties
@@ -1 +1,4 @@
-com.bartek.esa.core.plugin.JavaPlugin.PACKAGE_LACK=There is no package defined in AndroidManifest.xml file. Please check fix to use this tool.
\ No newline at end of file
+com.bartek.esa.core.archetype.JavaPlugin.NO_PACKAGE=There is no package defined in AndroidManifest.xml file. \n\
+  Package should be defined as attribute of <manifest> tag.\n\
+  For example: <manifest package="com.bartek.esa.test">\n\
+  Please fix it to use this tool.
\ No newline at end of file