diff --git a/README.md b/README.md
index 96a8ce59c..b2a3bdb89 100644
--- a/README.md
+++ b/README.md
@@ -13,20 +13,28 @@ lombok-intellij-plugin [![Donate](https://www.paypal.com/en_US/i/btn/btn_donateC
 
 Provides support for lombok annotations to write great Java code with IntelliJ IDEA.
 
-**Last version (0.30) released on 05.09.2020**
+**Last version (0.31) released on 06.09.2020**
 
 ---
-## Unfortunately the current IntelliJ 2020.2 version has a bug and lombok plugin can't be used normally.
-## Use previous IntelliJ version 2020.1 or update to IntelliJ IDEA 2020.2.1
+:collision: **Unfortunately the current IntelliJ 2020.2 version has a bug and lombok plugin can't be used normally.** :collision:
+
+:hammer_and_wrench: Use previous IntelliJ version 2020.1 or update to IntelliJ IDEA 2020.2.1
+---
+
+:collision: **The latest IntelliJ IDEA versions still contains a BUG :beetle: for several plugins (including plugin for Lombok) were shown as incompatible with the updated version of the IDE.** :collision:
+
+You can find the issue with a detailed explanation here: https://youtrack.jetbrains.com/issue/IDEA-237113 and https://youtrack.jetbrains.com/issue/IDEA-246822
+
+:hammer_and_wrench: As of now, the workaround is to re-install the plugin in the IDE settings.
 ---
 
 35th version of plugin released.
 
 Install it automatically from IntelliJ Idea plugin repository.
 
-Tested and supports IntelliJ versions: 2016.2, 2016.3, 2017.X, 2018.X, 2019.1, 2019.2, 2019.3, 2020.1 and 2020.2.1
+Tested and supports IntelliJ versions: 2017.X, 2018.X, 2019.X, 2020.1 and 2020.2.1
 
-Last support for IntelliJ 2016.2 and 2016.3 by plugin version 0.30!
+Last support for IntelliJ 2016.2 and 2016.3 by plugin version 0.31!
 
 Last support for IntelliJ 15.0.6 and 2016.1 by plugin version 0.19!
 
diff --git a/build.gradle b/build.gradle
index 08b4215ab..c23f4c074 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-  id "org.jetbrains.intellij" version "0.4.22"
+  id "org.jetbrains.intellij" version "0.4.26"
   id "org.jetbrains.grammarkit" version "2019.2.1"
   id "com.github.ManifestClasspath" version "0.1.0-RELEASE"
 }
@@ -83,8 +83,8 @@ dependencies {
   lombok group: 'org.projectlombok', name: 'lombok', version: '1.18.12', classifier: 'sources', ext: 'jar'
 
   testImplementation("junit:junit:4.13")
-  testImplementation("org.mockito:mockito-core:3.5.10")
-  testRuntimeOnly("org.junit.vintage:junit-vintage-engine:5.6.2")
+  testImplementation("org.mockito:mockito-core:3.5.11")
+  testRuntimeOnly("org.junit.vintage:junit-vintage-engine:5.7.0")
 }
 
 // Tasks
diff --git a/gradle.properties b/gradle.properties
index f3cb89986..ab951d983 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -7,7 +7,7 @@ ideaVersion=2019.2
 #
 pluginGroup=de.plushnikov.intellij.plugin
 pluginName=lombok-plugin
-pluginVersion=0.31
+pluginVersion=0.32
 #
 javaVersion=1.8
 sources=true
diff --git a/parts/pluginChanges.html b/parts/pluginChanges.html
index 0cf2ccc84..9632fc289 100644
--- a/parts/pluginChanges.html
+++ b/parts/pluginChanges.html
@@ -1,4 +1,12 @@
 <ul>
+  <li>0.32
+    <ol>
+      <li>Fixed #761: EqualsAndHashCode: Wrong warning 'A method with one of those names already exists'</li>
+      <li>Fixed #826: Error if using @FieldNameConstants in switch case</li>
+      <li>Fixed #858: Delombok produces duplicate @NonNull annotations on setters/getters</li>
+      <li>Fixed #933: Enable annotation processing warning showing everytime project is opened</li>
+    </ol>
+  </li>
   <li>0.31
     <ol>
       <li>Fixed #923: ArrayIndexOutOfBoundsException in ReplaceExplicitTypeWithVariableIntention</li>
diff --git a/settings.gradle b/settings.gradle
index f1e90982a..934d131ab 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1 +1,13 @@
-rootProject.name = 'lombok-plugin'
\ No newline at end of file
+pluginManagement {
+  repositories {
+    maven {
+      url 'https://jetbrains.bintray.com/intellij-plugin-service'
+    }
+    maven {
+      url "https://plugins.gradle.org/m2/"
+    }
+    mavenCentral()
+  }
+}
+
+rootProject.name = 'lombok-plugin'
diff --git a/src/main/java/de/plushnikov/intellij/plugin/Version.java b/src/main/java/de/plushnikov/intellij/plugin/Version.java
index 5f11b21b8..d2bc66589 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/Version.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/Version.java
@@ -5,7 +5,7 @@ public interface Version {
   /**
    * Current plugin version.
    */
-  String PLUGIN_VERSION = "0.31";
+  String PLUGIN_VERSION = "0.32";
   /**
    * Current version of lombok plugin
    */
diff --git a/src/main/java/de/plushnikov/intellij/plugin/action/delombok/DelombokHandler.java b/src/main/java/de/plushnikov/intellij/plugin/action/delombok/DelombokHandler.java
index e80579e43..58b121fcb 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/action/delombok/DelombokHandler.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/action/delombok/DelombokHandler.java
@@ -236,31 +236,21 @@ private PsiMethod rebuildMethod(@NotNull Project project, @NotNull PsiMethod fro
       resultMethod.getThrowsList().replace(elementFactory.createReferenceList(refs));
     }
 
-    for (PsiParameter parameter : fromMethod.getParameterList().getParameters()) {
-      PsiParameter param = elementFactory.createParameter(parameter.getName(), parameter.getType());
-      final PsiModifierList parameterModifierList = parameter.getModifierList();
-      if (parameterModifierList != null) {
-        PsiModifierList modifierList = param.getModifierList();
-        for (PsiAnnotation originalAnnotation : parameterModifierList.getAnnotations()) {
-          final PsiAnnotation annotation = modifierList.addAnnotation(originalAnnotation.getQualifiedName());
-          for (PsiNameValuePair nameValuePair : originalAnnotation.getParameterList().getAttributes()) {
-            annotation.setDeclaredAttributeValue(nameValuePair.getName(), nameValuePair.getValue());
-          }
-        }
-        modifierList.setModifierProperty(PsiModifier.FINAL, parameterModifierList.hasModifierProperty(PsiModifier.FINAL));
+    for (PsiParameter fromParameter : fromMethod.getParameterList().getParameters()) {
+      PsiParameter toParameter = elementFactory.createParameter(fromParameter.getName(), fromParameter.getType());
+      final PsiModifierList fromParameterModifierList = fromParameter.getModifierList();
+      if (fromParameterModifierList != null) {
+        final PsiModifierList toParameterModifierList = toParameter.getModifierList();
+        copyAnnotations(fromParameterModifierList, toParameterModifierList);
+        toParameterModifierList.setModifierProperty(PsiModifier.FINAL, fromParameterModifierList.hasModifierProperty(PsiModifier.FINAL));
       }
-      resultMethod.getParameterList().add(param);
+      resultMethod.getParameterList().add(toParameter);
     }
 
     final PsiModifierList fromMethodModifierList = fromMethod.getModifierList();
     final PsiModifierList resultMethodModifierList = resultMethod.getModifierList();
     copyModifiers(fromMethodModifierList, resultMethodModifierList);
-    for (PsiAnnotation psiAnnotation : fromMethodModifierList.getAnnotations()) {
-      final PsiAnnotation annotation = resultMethodModifierList.addAnnotation(psiAnnotation.getQualifiedName());
-      for (PsiNameValuePair nameValuePair : psiAnnotation.getParameterList().getAttributes()) {
-        annotation.setDeclaredAttributeValue(nameValuePair.getName(), nameValuePair.getValue());
-      }
-    }
+    copyAnnotations(fromMethodModifierList, resultMethodModifierList);
 
     PsiCodeBlock body = fromMethod.getBody();
     if (null != body) {
@@ -272,6 +262,21 @@ private PsiMethod rebuildMethod(@NotNull Project project, @NotNull PsiMethod fro
     return (PsiMethod) CodeStyleManager.getInstance(project).reformat(resultMethod);
   }
 
+  private void copyAnnotations(@NotNull PsiModifierList fromModifierList, @NotNull PsiModifierList toModifierList) {
+    final Set<String> existedAnnotation = Stream.of(toModifierList.getAnnotations())
+      .map(PsiAnnotation::getQualifiedName)
+      .collect(Collectors.toSet());
+    for (PsiAnnotation originalAnnotation : fromModifierList.getAnnotations()) {
+      final String qualifiedName = StringUtil.notNullize(originalAnnotation.getQualifiedName());
+      if (!existedAnnotation.contains(qualifiedName)) {
+        final PsiAnnotation annotation = toModifierList.addAnnotation(qualifiedName);
+        for (PsiNameValuePair nameValuePair : originalAnnotation.getParameterList().getAttributes()) {
+          annotation.setDeclaredAttributeValue(nameValuePair.getName(), nameValuePair.getValue());
+        }
+      }
+    }
+  }
+
   private void rebuildTypeParameter(@NotNull PsiTypeParameterListOwner listOwner, @NotNull PsiTypeParameterListOwner resultOwner) {
     final PsiTypeParameterList resultOwnerTypeParameterList = resultOwner.getTypeParameterList();
     if (null != resultOwnerTypeParameterList) {
diff --git a/src/main/java/de/plushnikov/intellij/plugin/activity/LombokProjectValidatorActivity.java b/src/main/java/de/plushnikov/intellij/plugin/activity/LombokProjectValidatorActivity.java
index c07082607..9a97e9886 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/activity/LombokProjectValidatorActivity.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/activity/LombokProjectValidatorActivity.java
@@ -5,7 +5,6 @@
 import com.intellij.notification.*;
 import com.intellij.openapi.module.Module;
 import com.intellij.openapi.module.ModuleManager;
-import com.intellij.openapi.options.ShowSettingsUtil;
 import com.intellij.openapi.progress.ProcessCanceledException;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.roots.ModuleRootManager;
@@ -121,9 +120,9 @@ private CompilerConfigurationImpl getCompilerConfiguration(Project project) {
   }
 
   private boolean hasAnnotationProcessorsEnabled(Project project) {
-    CompilerConfigurationImpl compilerConfiguration = getCompilerConfiguration(project);
+    final CompilerConfigurationImpl compilerConfiguration = getCompilerConfiguration(project);
     return compilerConfiguration.getDefaultProcessorProfile().isEnabled() &&
-      compilerConfiguration.getModuleProcessorProfiles().stream().anyMatch(AnnotationProcessingConfiguration::isEnabled);
+      compilerConfiguration.getModuleProcessorProfiles().stream().allMatch(AnnotationProcessingConfiguration::isEnabled);
   }
 
   private boolean hasLombokLibrary(Project project) {
@@ -179,26 +178,4 @@ int compareVersionString(@NotNull String firstVersionOne, @NotNull String second
     }
     return 0;
   }
-
-  /**
-   * Simple {@link NotificationListener.Adapter} that opens Settings Page for correct dialog.
-   */
-  private static class SettingsOpeningListener extends NotificationListener.Adapter {
-
-    private final Project project;
-    private final String nameToSelect;
-
-    SettingsOpeningListener(Project project, String nameToSelect) {
-      this.project = project;
-      this.nameToSelect = nameToSelect;
-    }
-
-    @Override
-    protected void hyperlinkActivated(@NotNull final Notification notification, @NotNull final HyperlinkEvent e) {
-
-      if (!project.isDisposed()) {
-        ShowSettingsUtil.getInstance().showSettingsDialog(project, nameToSelect);
-      }
-    }
-  }
 }
diff --git a/src/main/java/de/plushnikov/intellij/plugin/extension/LombokHighlightErrorFilter.java b/src/main/java/de/plushnikov/intellij/plugin/extension/LombokHighlightErrorFilter.java
index c9d34a04b..57fb425a6 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/extension/LombokHighlightErrorFilter.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/extension/LombokHighlightErrorFilter.java
@@ -8,10 +8,7 @@
 import com.intellij.openapi.editor.colors.TextAttributesKey;
 import com.intellij.psi.*;
 import com.intellij.psi.util.PsiTreeUtil;
-import de.plushnikov.intellij.plugin.handler.BuilderHandler;
-import de.plushnikov.intellij.plugin.handler.EqualsAndHashCodeCallSuperHandler;
-import de.plushnikov.intellij.plugin.handler.LazyGetterHandler;
-import de.plushnikov.intellij.plugin.handler.OnXAnnotationHandler;
+import de.plushnikov.intellij.plugin.handler.*;
 import lombok.SneakyThrows;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -19,7 +16,6 @@
 import java.util.*;
 import java.util.regex.Pattern;
 
-
 public class LombokHighlightErrorFilter implements HighlightInfoFilter {
   private static final Pattern LOMBOK_ANY_ANNOTATION_REQUIRED = Pattern.compile("Incompatible types\\. Found: '__*', required: 'lombok.*AnyAnnotation\\[\\]'");
 
@@ -143,6 +139,19 @@ public boolean accept(@NotNull PsiElement highlightedElement) {
       }
     },
 
+    CONSTANT_EXPRESSION_REQUIRED(HighlightSeverity.ERROR, CodeInsightColors.ERRORS_ATTRIBUTES) {
+      @Override
+      public boolean descriptionCheck(@Nullable String description) {
+//        message("constant.expression.required")
+        return "Constant expression required".equals(description);
+      }
+
+      @Override
+      public boolean accept(@NotNull PsiElement highlightedElement) {
+        return !FieldNameConstantsHandler.isFiledNameConstants(highlightedElement);
+      }
+    },
+
     // WARNINGS HANDLERS
 
     VARIABLE_INITIALIZER_IS_REDUNDANT(HighlightSeverity.WARNING, CodeInsightColors.NOT_USED_ELEMENT_ATTRIBUTES) {
diff --git a/src/main/java/de/plushnikov/intellij/plugin/handler/FieldNameConstantsHandler.java b/src/main/java/de/plushnikov/intellij/plugin/handler/FieldNameConstantsHandler.java
new file mode 100644
index 000000000..272999925
--- /dev/null
+++ b/src/main/java/de/plushnikov/intellij/plugin/handler/FieldNameConstantsHandler.java
@@ -0,0 +1,25 @@
+package de.plushnikov.intellij.plugin.handler;
+
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiModifierListOwner;
+import com.intellij.psi.PsiReferenceExpression;
+import com.intellij.psi.util.PsiTreeUtil;
+import de.plushnikov.intellij.plugin.util.PsiAnnotationSearchUtil;
+import lombok.experimental.FieldNameConstants;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public class FieldNameConstantsHandler {
+
+  public static boolean isFiledNameConstants(@NotNull PsiElement element) {
+    @Nullable PsiReferenceExpression psiReferenceExpression = PsiTreeUtil.getParentOfType(element, PsiReferenceExpression.class);
+    if (psiReferenceExpression == null) {
+      return false;
+    }
+    PsiElement psiElement = psiReferenceExpression.resolve();
+    if (!(psiElement instanceof PsiModifierListOwner)) {
+      return false;
+    }
+    return PsiAnnotationSearchUtil.isAnnotatedWith((PsiModifierListOwner) psiElement, FieldNameConstants.class);
+  }
+}
diff --git a/src/main/java/de/plushnikov/intellij/plugin/processor/ValProcessor.java b/src/main/java/de/plushnikov/intellij/plugin/processor/ValProcessor.java
index 402113521..fabaf809f 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/processor/ValProcessor.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/processor/ValProcessor.java
@@ -183,14 +183,18 @@ public void verifyParameter(@NotNull final PsiParameter psiParameter, @NotNull f
     }
   }
 
+  private boolean canInferType(@NotNull PsiTypeElement typeElement) {
+    final PsiElement parent = typeElement.getParent();
+    return (parent instanceof PsiLocalVariable && isValOrVar((PsiLocalVariable) parent)) ||
+      (parent instanceof PsiParameter && isValOrVarForEach((PsiParameter) parent));
+  }
+
   @Nullable
   public PsiType inferType(PsiTypeElement typeElement) {
     PsiType psiType = null;
 
-    final PsiElement parent = typeElement.getParent();
-    if ((parent instanceof PsiLocalVariable && isValOrVar((PsiLocalVariable) parent)) ||
-      (parent instanceof PsiParameter && isValOrVarForEach((PsiParameter) parent))) {
-
+    if (canInferType(typeElement)) {
+      final PsiElement parent = typeElement.getParent();
       if (parent instanceof PsiLocalVariable) {
         psiType = processLocalVariableInitializer(((PsiLocalVariable) parent).getInitializer());
       } else {
diff --git a/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/EqualsAndHashCodeProcessor.java b/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/EqualsAndHashCodeProcessor.java
index 2c2aa4398..a484df867 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/EqualsAndHashCodeProcessor.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/EqualsAndHashCodeProcessor.java
@@ -114,17 +114,16 @@ private boolean validateAnnotationOnRightType(@NotNull PsiClass psiClass, @NotNu
     return result;
   }
 
-  private boolean validateExistingMethods(@NotNull PsiClass psiClass, @NotNull ProblemBuilder builder) {
+  private void validateExistingMethods(@NotNull PsiClass psiClass, @NotNull ProblemBuilder builder) {
     if (hasOneOfMethodsDefined(psiClass)) {
       builder.addWarning("Not generating equals and hashCode: A method with one of those names already exists. (Either both or none of these methods will be generated).");
-      return false;
     }
-    return true;
   }
 
   private boolean hasOneOfMethodsDefined(@NotNull PsiClass psiClass) {
     final Collection<PsiMethod> classMethodsIntern = PsiClassUtil.collectClassMethodsIntern(psiClass);
-    return PsiMethodUtil.hasMethodByName(classMethodsIntern, EQUALS_METHOD_NAME, HASH_CODE_METHOD_NAME);
+    return PsiMethodUtil.hasMethodByName(classMethodsIntern, EQUALS_METHOD_NAME, 1) ||
+      PsiMethodUtil.hasMethodByName(classMethodsIntern, HASH_CODE_METHOD_NAME, 0);
   }
 
   protected void generatePsiElements(@NotNull PsiClass psiClass, @NotNull PsiAnnotation psiAnnotation, @NotNull List<? super PsiElement> target) {
@@ -145,7 +144,7 @@ protected Collection<PsiMethod> createEqualAndHashCode(@NotNull PsiClass psiClas
     result.add(createEqualsMethod(psiClass, psiAnnotation, shouldGenerateCanEqual, memberInfos));
 
     final Collection<PsiMethod> classMethods = PsiClassUtil.collectClassMethodsIntern(psiClass);
-    if (shouldGenerateCanEqual && !PsiMethodUtil.hasMethodByName(classMethods, CAN_EQUAL_METHOD_NAME)) {
+    if (shouldGenerateCanEqual && !PsiMethodUtil.hasMethodByName(classMethods, CAN_EQUAL_METHOD_NAME, 1)) {
       result.add(createCanEqualMethod(psiClass, psiAnnotation));
     }
 
diff --git a/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/ToStringProcessor.java b/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/ToStringProcessor.java
index d67d879c4..a7c654407 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/ToStringProcessor.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/ToStringProcessor.java
@@ -29,7 +29,7 @@
  */
 public class ToStringProcessor extends AbstractClassProcessor {
 
-  public static final String METHOD_NAME = "toString";
+  public static final String TO_STRING_METHOD_NAME = "toString";
 
   private static final String INCLUDE_ANNOTATION_METHOD = "name";
   private static final String INCLUDE_ANNOTATION_RANK = "rank";
@@ -75,16 +75,15 @@ private boolean validateAnnotationOnRigthType(@NotNull PsiClass psiClass, @NotNu
     return result;
   }
 
-  private boolean validateExistingMethods(@NotNull PsiClass psiClass, @NotNull ProblemBuilder builder) {
-    boolean result = true;
-
-    final Collection<PsiMethod> classMethods = PsiClassUtil.collectClassMethodsIntern(psiClass);
-    if (PsiMethodUtil.hasMethodByName(classMethods, METHOD_NAME)) {
-      builder.addWarning("Not generated '%s'(): A method with same name already exists", METHOD_NAME);
-      result = false;
+  private void validateExistingMethods(@NotNull PsiClass psiClass, @NotNull ProblemBuilder builder) {
+    if (hasToStringMethodDefined(psiClass)) {
+      builder.addWarning("Not generated '%s'(): A method with same name already exists", TO_STRING_METHOD_NAME);
     }
+  }
 
-    return result;
+  private boolean hasToStringMethodDefined(@NotNull PsiClass psiClass) {
+    final Collection<PsiMethod> classMethods = PsiClassUtil.collectClassMethodsIntern(psiClass);
+    return PsiMethodUtil.hasMethodByName(classMethods, TO_STRING_METHOD_NAME, 0);
   }
 
   protected void generatePsiElements(@NotNull PsiClass psiClass, @NotNull PsiAnnotation psiAnnotation, @NotNull List<? super PsiElement> target) {
@@ -93,8 +92,7 @@ protected void generatePsiElements(@NotNull PsiClass psiClass, @NotNull PsiAnnot
 
   @NotNull
   Collection<PsiMethod> createToStringMethod(@NotNull PsiClass psiClass, @NotNull PsiAnnotation psiAnnotation) {
-    final Collection<PsiMethod> classMethods = PsiClassUtil.collectClassMethodsIntern(psiClass);
-    if (PsiMethodUtil.hasMethodByName(classMethods, METHOD_NAME)) {
+    if (hasToStringMethodDefined(psiClass)) {
       return Collections.emptyList();
     }
 
@@ -110,7 +108,7 @@ public PsiMethod createToStringMethod(@NotNull PsiClass psiClass, @NotNull Colle
     final String paramString = createParamString(psiClass, memberInfos, psiAnnotation, forceCallSuper);
     final String blockText = String.format("return \"%s(%s)\";", getSimpleClassName(psiClass), paramString);
 
-    final LombokLightMethodBuilder methodBuilder = new LombokLightMethodBuilder(psiManager, METHOD_NAME)
+    final LombokLightMethodBuilder methodBuilder = new LombokLightMethodBuilder(psiManager, TO_STRING_METHOD_NAME)
       .withMethodReturnType(PsiType.getJavaLangString(psiManager, GlobalSearchScope.allScope(psiClass.getProject())))
       .withContainingClass(psiClass)
       .withNavigationElement(psiAnnotation)
diff --git a/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/builder/BuilderPreDefinedInnerClassMethodProcessor.java b/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/builder/BuilderPreDefinedInnerClassMethodProcessor.java
index 4e22f03c5..3b297b89a 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/builder/BuilderPreDefinedInnerClassMethodProcessor.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/processor/clazz/builder/BuilderPreDefinedInnerClassMethodProcessor.java
@@ -61,7 +61,7 @@ protected Collection<? extends PsiElement> generatePsiElements(@NotNull PsiClass
     }
 
     // create 'toString' method
-    if (!existedMethodNames.contains(ToStringProcessor.METHOD_NAME)) {
+    if (!existedMethodNames.contains(ToStringProcessor.TO_STRING_METHOD_NAME)) {
       result.add(builderHandler.createToStringMethod(psiAnnotation, psiBuilderClass));
     }
 
diff --git a/src/main/java/de/plushnikov/intellij/plugin/processor/handler/EqualsAndHashCodeToStringHandler.java b/src/main/java/de/plushnikov/intellij/plugin/processor/handler/EqualsAndHashCodeToStringHandler.java
index e853a4a5f..c2bd5644c 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/processor/handler/EqualsAndHashCodeToStringHandler.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/processor/handler/EqualsAndHashCodeToStringHandler.java
@@ -211,7 +211,7 @@ private String buildAttributeNameString(boolean doNotUseGetters, @NotNull PsiFie
         final PsiAnnotation getterLombokAnnotation = PsiAnnotationSearchUtil.findAnnotation(psiClass, Getter.class);
         hasGetter = null == getterLombokAnnotation || null != LombokProcessorUtil.getMethodModifier(getterLombokAnnotation);
       } else {
-        hasGetter = PsiMethodUtil.hasMethodByName(PsiClassUtil.collectClassMethodsIntern(psiClass), getterName);
+        hasGetter = PsiMethodUtil.hasMethodByName(PsiClassUtil.collectClassMethodsIntern(psiClass), getterName, 0);
       }
 
       return hasGetter ? getterName + "()" : fieldName;
diff --git a/src/main/java/de/plushnikov/intellij/plugin/processor/handler/SuperBuilderHandler.java b/src/main/java/de/plushnikov/intellij/plugin/processor/handler/SuperBuilderHandler.java
index 4cbe10e2c..02d55a675 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/processor/handler/SuperBuilderHandler.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/processor/handler/SuperBuilderHandler.java
@@ -343,7 +343,7 @@ private Collection<PsiMethod> addAllMethodsForBaseBuilderClass(@NotNull PsiClass
       result.add(buildMethod);
     }
 
-    if (!existedMethodNames.contains(ToStringProcessor.METHOD_NAME)) {
+    if (!existedMethodNames.contains(ToStringProcessor.TO_STRING_METHOD_NAME)) {
       // create 'toString' method
       result.add(createToStringMethod(psiAnnotation, baseClassBuilder, forceCallSuper));
     }
diff --git a/src/main/java/de/plushnikov/intellij/plugin/util/LombokRuntimeVersion.java b/src/main/java/de/plushnikov/intellij/plugin/util/LombokRuntimeVersion.java
deleted file mode 100644
index 5b42551ea..000000000
--- a/src/main/java/de/plushnikov/intellij/plugin/util/LombokRuntimeVersion.java
+++ /dev/null
@@ -1,35 +0,0 @@
-package de.plushnikov.intellij.plugin.util;
-
-import com.intellij.openapi.project.Project;
-import com.intellij.openapi.roots.ProjectRootManager;
-import com.intellij.openapi.vfs.VirtualFile;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.Collection;
-import java.util.List;
-import java.util.Objects;
-import java.util.stream.Collectors;
-
-public class LombokRuntimeVersion {
-  public String findCurrentLombokVersion() {
-    //"1.18.4" -> @FieldNameConstants redesigned
-    //"1.18.2" -> @SuperBuilder added
-    //"1.18.0" -> @Flogger added
-    //"1.16.22" -> lombok.experimental.Builder and lombok.experimental.Value were removed
-    //"1.16.16" -> @Builder.Default added
-    //"1.16.12" -> @var added
-    //"1.16.10" -> JBoss logger added
-    //"1.16.6" -> @Helper added
-
-    return "";
-  }
-
-  public Collection<String> getLombokJarsInProject(@NotNull Project project) {
-    List<VirtualFile> pathsFiles = ProjectRootManager.getInstance(project).orderEntries().withoutSdk().librariesOnly().getPathsList().getVirtualFiles();
-    return pathsFiles.stream()
-      .filter(file -> Objects.equals(file.getExtension(), "jar"))
-      .filter(file -> file.getNameWithoutExtension().contains("lombok-"))
-      .map(VirtualFile::getNameWithoutExtension)
-      .collect(Collectors.toSet());
-  }
-}
diff --git a/src/main/java/de/plushnikov/intellij/plugin/util/PsiMethodUtil.java b/src/main/java/de/plushnikov/intellij/plugin/util/PsiMethodUtil.java
index bcd3a1781..ff3826e8a 100644
--- a/src/main/java/de/plushnikov/intellij/plugin/util/PsiMethodUtil.java
+++ b/src/main/java/de/plushnikov/intellij/plugin/util/PsiMethodUtil.java
@@ -3,9 +3,7 @@
 import com.intellij.psi.*;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.Arrays;
 import java.util.Collection;
-import java.util.List;
 
 /**
  * @author Plushnikov Michail
@@ -17,35 +15,25 @@ public static PsiCodeBlock createCodeBlockFromText(@NotNull String blockText, @N
     return elementFactory.createCodeBlockFromText("{" + blockText + "}", psiElement);
   }
 
-  public static boolean hasMethodByName(@NotNull Collection<PsiMethod> classMethods, @NotNull String methodName) {
-    return classMethods.stream().map(PsiMethod::getName).anyMatch(methodName::equals);
+  public static boolean hasMethodByName(@NotNull Collection<PsiMethod> classMethods, @NotNull String methodName, int paramCount) {
+    return classMethods.stream()
+      .filter(m -> methodName.equals(m.getName()))
+      .anyMatch(m -> acceptedParameterCount(m, paramCount));
   }
 
-  public static boolean hasMethodByName(@NotNull Collection<PsiMethod> classMethods, String... methodNames) {
-    final List<String> searchedMethodNames = Arrays.asList(methodNames);
-    return classMethods.stream().map(PsiMethod::getName).anyMatch(searchedMethodNames::contains);
+  public static boolean hasSimilarMethod(@NotNull Collection<PsiMethod> classMethods, @NotNull String methodName, int paramCount) {
+    return classMethods.stream()
+      .filter(m -> methodName.equalsIgnoreCase(m.getName()))
+      .anyMatch(m -> acceptedParameterCount(m, paramCount));
   }
 
-  public static boolean hasSimilarMethod(@NotNull Collection<PsiMethod> classMethods, @NotNull String methodName, int methodArgCount) {
-    for (PsiMethod classMethod : classMethods) {
-      if (isSimilarMethod(classMethod, methodName, methodArgCount)) {
-        return true;
-      }
+  private static boolean acceptedParameterCount(@NotNull PsiMethod classMethod, int methodArgCount) {
+    int minArgs = classMethod.getParameterList().getParametersCount();
+    int maxArgs = minArgs;
+    if (classMethod.isVarArgs()) {
+      minArgs--;
+      maxArgs = Integer.MAX_VALUE;
     }
-    return false;
-  }
-
-  private static boolean isSimilarMethod(@NotNull PsiMethod classMethod, @NotNull String methodName, int methodArgCount) {
-    boolean equalNames = methodName.equalsIgnoreCase(classMethod.getName());
-    if (equalNames) {
-      int minArgs = classMethod.getParameterList().getParametersCount();
-      int maxArgs = minArgs;
-      if (classMethod.isVarArgs()) {
-        minArgs--;
-        maxArgs = Integer.MAX_VALUE;
-      }
-      return !(methodArgCount < minArgs || methodArgCount > maxArgs);
-    }
-    return false;
+    return !(methodArgCount < minArgs || methodArgCount > maxArgs);
   }
 }
diff --git a/src/main/resources/messages/lombokBundle.properties b/src/main/resources/messages/lombokBundle.properties
index c11d31863..25af7570f 100644
--- a/src/main/resources/messages/lombokBundle.properties
+++ b/src/main/resources/messages/lombokBundle.properties
@@ -20,7 +20,10 @@ daemon.donate.title=Lombok support plugin updated to v{0}
 daemon.donate.content=<br/>\
 Helpful? <b><a href="https://www.paypal.me/mplushnikov">Donate with PayPal</a></b><br/><br/>\
 Fixes:<br/>\
-- Fixed (<a href="https://github.com/mplushnikov/lombok-intellij-plugin/issues/923">#923</a>): ArrayIndexOutOfBoundsException in ReplaceExplicitTypeWithVariableIntention<br/>\
+- Fixed (<a href="https://github.com/mplushnikov/lombok-intellij-plugin/issues/761">#761</a>): EqualsAndHashCode: Wrong warning 'A method with one of those names already exists'<br/>\
+- Fixed (<a href="https://github.com/mplushnikov/lombok-intellij-plugin/issues/826">#826</a>): Error if using @FieldNameConstants in switch case<br/>\
+- Fixed (<a href="https://github.com/mplushnikov/lombok-intellij-plugin/issues/858">#858</a>): Delombok produces duplicate @NonNull annotations on setters/getters<br/>\
+- Fixed (<a href="https://github.com/mplushnikov/lombok-intellij-plugin/issues/933">#933</a>): Enable annotation processing warning showing everytime project is opened<br/>\
   <br>\
   If you find my plugin helpful, donate me using <br><b>\
   <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick\\&hosted_button_id=3F9HXD7A2SMCN\\&source=url">PayPal</a>\
diff --git a/src/test/java/de/plushnikov/RequiredApiVersion.java b/src/test/java/de/plushnikov/RequiredApiVersion.java
index 9e3a85e21..361b4cf99 100644
--- a/src/test/java/de/plushnikov/RequiredApiVersion.java
+++ b/src/test/java/de/plushnikov/RequiredApiVersion.java
@@ -1,10 +1,6 @@
 package de.plushnikov;
 
-import java.lang.annotation.Documented;
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
+import java.lang.annotation.*;
 
 /**
  * Defines that a test class may only run if the current API version is at least the given value.
diff --git a/src/test/java/de/plushnikov/intellij/plugin/action/delombok/DelombokDataActionTest.java b/src/test/java/de/plushnikov/intellij/plugin/action/delombok/DelombokDataActionTest.java
index 59ed36471..139c71bf3 100644
--- a/src/test/java/de/plushnikov/intellij/plugin/action/delombok/DelombokDataActionTest.java
+++ b/src/test/java/de/plushnikov/intellij/plugin/action/delombok/DelombokDataActionTest.java
@@ -18,4 +18,7 @@ public void testDataSimple() throws Exception {
     doTest();
   }
 
+  public void testDataWithAnnotations() throws Exception {
+    doTest();
+  }
 }
diff --git a/src/test/java/de/plushnikov/intellij/plugin/processor/EqualsAndHashCodeTest.java b/src/test/java/de/plushnikov/intellij/plugin/processor/EqualsAndHashCodeTest.java
index f9dcddf97..bfe23cc2e 100644
--- a/src/test/java/de/plushnikov/intellij/plugin/processor/EqualsAndHashCodeTest.java
+++ b/src/test/java/de/plushnikov/intellij/plugin/processor/EqualsAndHashCodeTest.java
@@ -59,4 +59,7 @@ public class EqualsAndHashCodeTest extends AbstractLombokParsingTestCase {
     doTest(true);
   }
 
+  public void testEqualsandhashcode$EqualsAndHashCodeWithNamedExistingMethods() {
+    doTest(true);
+  }
 }
diff --git a/src/test/java/de/plushnikov/intellij/plugin/processor/ToStringTest.java b/src/test/java/de/plushnikov/intellij/plugin/processor/ToStringTest.java
index 671f95c2b..808a80ade 100644
--- a/src/test/java/de/plushnikov/intellij/plugin/processor/ToStringTest.java
+++ b/src/test/java/de/plushnikov/intellij/plugin/processor/ToStringTest.java
@@ -38,4 +38,8 @@ public class ToStringTest extends AbstractLombokParsingTestCase {
   public void testTostring$ToStringSimpleClassName() {
     doTest(true);
   }
+
+  public void testTostring$ToStringWithNamedExistingMethods() {
+    doTest(true);
+  }
 }
diff --git a/test-manual/src/main/java/de/plushnikov/val/Issue802.java b/test-manual/src/main/java/de/plushnikov/val/Issue802.java
new file mode 100644
index 000000000..7f6e928ea
--- /dev/null
+++ b/test-manual/src/main/java/de/plushnikov/val/Issue802.java
@@ -0,0 +1,13 @@
+package de.plushnikov.val;
+
+import lombok.val;
+import java.util.Optional;
+public class Issue802 {
+  public static void main(String... args) {
+    val strOpt = Optional.of("1");
+    val intOptInferredLambda = strOpt.map(str -> Integer.valueOf(str));
+    val intOptInferredMethodRef = strOpt.map(Integer::valueOf);
+    Optional<Integer> intOptExplicit = intOptInferredMethodRef;
+    intOptExplicit = intOptInferredLambda;
+  }
+}
diff --git a/testData/action/delombok/data/afterDataWithAnnotations.java b/testData/action/delombok/data/afterDataWithAnnotations.java
new file mode 100644
index 000000000..1dbdbb148
--- /dev/null
+++ b/testData/action/delombok/data/afterDataWithAnnotations.java
@@ -0,0 +1,50 @@
+import lombok.NonNull;
+
+public class DataWithAnnotations {
+  @NonNull
+  @Deprecated
+  @SuppressWarnings("any")
+  private Integer someParentInteger;
+
+  public DataWithAnnotations(@NonNull Integer someParentInteger) {
+    this.someParentInteger = someParentInteger;
+  }
+
+  @Deprecated
+  public @NonNull Integer getSomeParentInteger() {
+    return this.someParentInteger;
+  }
+
+  @Deprecated
+  public void setSomeParentInteger(@NonNull Integer someParentInteger) {
+    this.someParentInteger = someParentInteger;
+  }
+
+  public boolean equals(final Object o) {
+    if (o == this) return true;
+    if (!(o instanceof DataWithAnnotations)) return false;
+    final DataWithAnnotations other = (DataWithAnnotations) o;
+    if (!other.canEqual((Object) this)) return false;
+    final Object this$someParentInteger = this.getSomeParentInteger();
+    final Object other$someParentInteger = other.getSomeParentInteger();
+    if (this$someParentInteger == null ? other$someParentInteger != null : !this$someParentInteger.equals(other$someParentInteger))
+      return false;
+    return true;
+  }
+
+  protected boolean canEqual(final Object other) {
+    return other instanceof DataWithAnnotations;
+  }
+
+  public int hashCode() {
+    final int PRIME = 59;
+    int result = 1;
+    final Object $someParentInteger = this.getSomeParentInteger();
+    result = result * PRIME + ($someParentInteger == null ? 43 : $someParentInteger.hashCode());
+    return result;
+  }
+
+  public String toString() {
+    return "DataWithAnnotations(someParentInteger=" + this.getSomeParentInteger() + ")";
+  }
+}
diff --git a/testData/action/delombok/data/beforeDataWithAnnotations.java b/testData/action/delombok/data/beforeDataWithAnnotations.java
new file mode 100644
index 000000000..c3b17eb28
--- /dev/null
+++ b/testData/action/delombok/data/beforeDataWithAnnotations.java
@@ -0,0 +1,11 @@
+import lombok.Data;
+import lombok.NonNull;
+
+@Data
+public class DataWithAnnotations {
+  <caret>
+  @NonNull
+  @Deprecated
+  @SuppressWarnings("any")
+  private Integer someParentInteger;
+}
diff --git a/testData/after/equalsandhashcode/EqualsAndHashCodeWithNamedExistingMethods.java b/testData/after/equalsandhashcode/EqualsAndHashCodeWithNamedExistingMethods.java
new file mode 100644
index 000000000..dd30756bf
--- /dev/null
+++ b/testData/after/equalsandhashcode/EqualsAndHashCodeWithNamedExistingMethods.java
@@ -0,0 +1,40 @@
+import java.util.Objects;
+
+public class EqualsAndHashCodeWithNamedExistingMethods {
+    private int someInt;
+    private Integer someInteger;
+
+    public boolean equals(Object o, Object o2) {
+        return o.equals(o2);
+    }
+
+    public int hashCode(Float someFloat) {
+        return Objects.hash(someFloat);
+    }
+
+    public boolean equals(final Object o) {
+        if (o == this) return true;
+        if (!(o instanceof EqualsAndHashCodeWithNamedExistingMethods)) return false;
+        final EqualsAndHashCodeWithNamedExistingMethods other = (EqualsAndHashCodeWithNamedExistingMethods) o;
+        if (!other.canEqual((Object) this)) return false;
+        if (this.someInt != other.someInt) return false;
+        final Object this$someInteger = this.someInteger;
+        final Object other$someInteger = other.someInteger;
+        if (this$someInteger == null ? other$someInteger != null : !this$someInteger.equals(other$someInteger))
+            return false;
+        return true;
+    }
+
+    protected boolean canEqual(final Object other) {
+        return other instanceof EqualsAndHashCodeWithNamedExistingMethods;
+    }
+
+    public int hashCode() {
+        final int PRIME = 59;
+        int result = 1;
+        result = result * PRIME + this.someInt;
+        final Object $someInteger = this.someInteger;
+        result = result * PRIME + ($someInteger == null ? 43 : $someInteger.hashCode());
+        return result;
+    }
+}
diff --git a/testData/after/tostring/ToStringWithNamedExistingMethods.java b/testData/after/tostring/ToStringWithNamedExistingMethods.java
new file mode 100644
index 000000000..cb26269b8
--- /dev/null
+++ b/testData/after/tostring/ToStringWithNamedExistingMethods.java
@@ -0,0 +1,11 @@
+public class ToStringWithNamedExistingMethods {
+    private int someInt;
+
+    public String toString(String string) {
+        return string;
+    }
+
+    public String toString() {
+        return "ToStringWithNamedExistingMethods(someInt=" + this.someInt + ")";
+    }
+}
diff --git a/testData/before/equalsandhashcode/EqualsAndHashCodeWithNamedExistingMethods.java b/testData/before/equalsandhashcode/EqualsAndHashCodeWithNamedExistingMethods.java
new file mode 100644
index 000000000..a08067c33
--- /dev/null
+++ b/testData/before/equalsandhashcode/EqualsAndHashCodeWithNamedExistingMethods.java
@@ -0,0 +1,18 @@
+import lombok.EqualsAndHashCode;
+
+import java.util.Objects;
+
+@EqualsAndHashCode
+public class EqualsAndHashCodeWithNamedExistingMethods {
+    <caret>
+    private int someInt;
+    private Integer someInteger;
+
+    public boolean equals(Object o, Object o2) {
+        return o.equals(o2);
+    }
+
+    public int hashCode(Float someFloat) {
+        return Objects.hash(someFloat);
+    }
+}
diff --git a/testData/before/tostring/ToStringWithNamedExistingMethods.java b/testData/before/tostring/ToStringWithNamedExistingMethods.java
new file mode 100644
index 000000000..325c72b0e
--- /dev/null
+++ b/testData/before/tostring/ToStringWithNamedExistingMethods.java
@@ -0,0 +1,11 @@
+import lombok.ToString;
+
+@ToString
+public class ToStringWithNamedExistingMethods {
+<caret>
+    private int someInt;
+
+    public String toString(String string) {
+        return string;
+    }
+}