diff --git a/backend/src/main/resources/dynamic-http-metadata-provider.schema.json b/backend/src/main/resources/dynamic-http-metadata-provider.schema.json
index 167e79ab1..da9635f96 100644
--- a/backend/src/main/resources/dynamic-http-metadata-provider.schema.json
+++ b/backend/src/main/resources/dynamic-http-metadata-provider.schema.json
@@ -599,8 +599,7 @@
                         "certificateFile": {
                             "title": "label.certificate-file",
                             "description": "tooltip.certificate-file",
-                            "type": "string",
-                            "default": ""
+                            "type": "string"
                         }
                     },
                     "anyOf": [
diff --git a/backend/src/main/resources/i18n/messages_en.properties b/backend/src/main/resources/i18n/messages_en.properties
index f7c238fb5..df0ae980c 100644
--- a/backend/src/main/resources/i18n/messages_en.properties
+++ b/backend/src/main/resources/i18n/messages_en.properties
@@ -401,6 +401,7 @@ message.org-incomplete=These three fields must all be entered if any single fiel
 message.type-required=Missing required property: Type
 message.match-required=Missing required property: Match
 message.value-required=Missing required property: Value
+message.required=Missing required property.
 
 message.conflict=Conflict
 message.data-version-contention=Data Version Contention
diff --git a/ui/src/app/metadata/domain/model/wizards/metadata-source-base.ts b/ui/src/app/metadata/domain/model/wizards/metadata-source-base.ts
index ebc8921d8..673f176c1 100644
--- a/ui/src/app/metadata/domain/model/wizards/metadata-source-base.ts
+++ b/ui/src/app/metadata/domain/model/wizards/metadata-source-base.ts
@@ -60,6 +60,28 @@ export class MetadataSourceBase implements Wizard<MetadataResolver> {
     }
 
     getValidators(entityIdList: string[]): { [key: string]: any } {
+        const checkRequiredChild = (value, property, form) => {
+            if (!value) {
+                return {
+                    code: 'REQUIRED',
+                    path: `#${property.path}`,
+                    message: `message.required`,
+                    params: [value]
+                };
+            }
+            return null;
+        };
+        const checkRequiredChildren = (value, property, form) => {
+            let errors;
+            Object.keys(value).forEach((item, index, all) => {
+                const error = checkRequiredChild(item, { path: `${index}` }, form);
+                if (error) {
+                    errors = errors || [];
+                    errors.push(error);
+                }
+            });
+            return errors;
+        };
         const checkOrg = (value, property, form) => {
             const org = property.parent;
             const orgValue = org.value || {};
diff --git a/ui/src/app/metadata/metadata.module.ts b/ui/src/app/metadata/metadata.module.ts
index 946c89423..fd00a2274 100644
--- a/ui/src/app/metadata/metadata.module.ts
+++ b/ui/src/app/metadata/metadata.module.ts
@@ -9,7 +9,8 @@ import { MetadataRoutingModule } from './metadata.routing';
 import { ProviderModule } from './provider/provider.module';
 import { I18nModule } from '../i18n/i18n.module';
 import { CustomWidgetRegistry } from '../schema-form/registry';
-import { WidgetRegistry } from 'ngx-schema-form';
+import { WidgetRegistry, SchemaValidatorFactory } from 'ngx-schema-form';
+import { CustomSchemaValidatorFactory } from '../schema-form/service/schema-validator';
 
 
 @NgModule({
@@ -23,7 +24,11 @@ import { WidgetRegistry } from 'ngx-schema-form';
         I18nModule
     ],
     providers: [
-        { provide: WidgetRegistry, useClass: CustomWidgetRegistry }
+        { provide: WidgetRegistry, useClass: CustomWidgetRegistry },
+        {
+            provide: SchemaValidatorFactory,
+            useClass: CustomSchemaValidatorFactory
+        }
     ],
     declarations: [
         MetadataPageComponent
diff --git a/ui/src/app/schema-form/model/messages.ts b/ui/src/app/schema-form/model/messages.ts
new file mode 100644
index 000000000..6d6fa61fd
--- /dev/null
+++ b/ui/src/app/schema-form/model/messages.ts
@@ -0,0 +1,3 @@
+export const HARD_CODED_REQUIRED_MSG = RegExp('Missing required property');
+
+export const REQUIRED_MSG_OVERRIDE = 'message.required';
\ No newline at end of file
diff --git a/ui/src/app/schema-form/schema-form.module.ts b/ui/src/app/schema-form/schema-form.module.ts
index 842e903dd..13aba1369 100644
--- a/ui/src/app/schema-form/schema-form.module.ts
+++ b/ui/src/app/schema-form/schema-form.module.ts
@@ -1,5 +1,5 @@
 import { NgModule } from '@angular/core';
-import { SchemaFormModule } from 'ngx-schema-form';
+import { SchemaFormModule, SchemaValidatorFactory } from 'ngx-schema-form';
 import { CommonModule } from '@angular/common';
 import { ReactiveFormsModule } from '@angular/forms';
 
@@ -23,6 +23,7 @@ import { CustomObjectWidget } from './widget/object/object.component';
 import { CustomRadioComponent } from './widget/radio/radio.component';
 import { InlineObjectListComponent } from './widget/array/inline-obj-list.component';
 import { InlineObjectComponent } from './widget/object/inline-obj.component';
+import { CustomSchemaValidatorFactory } from './service/schema-validator';
 
 export const COMPONENTS = [
     BooleanRadioComponent,
diff --git a/ui/src/app/schema-form/service/schema-validator.ts b/ui/src/app/schema-form/service/schema-validator.ts
new file mode 100644
index 000000000..075a78ec9
--- /dev/null
+++ b/ui/src/app/schema-form/service/schema-validator.ts
@@ -0,0 +1,19 @@
+import * as ZSchema from 'z-schema';
+import { ZSchemaValidatorFactory } from 'ngx-schema-form';
+
+export class CustomSchemaValidatorFactory extends ZSchemaValidatorFactory {
+
+    protected zschema;
+
+    constructor() {
+        super();
+        this.createSchemaValidator();
+    }
+
+    private createSchemaValidator() {
+        this.zschema = new ZSchema({
+            breakOnFirstError: false
+        });
+    }
+}
+
diff --git a/ui/src/app/schema-form/service/schema.service.ts b/ui/src/app/schema-form/service/schema.service.ts
index 9cd7346de..617769de6 100644
--- a/ui/src/app/schema-form/service/schema.service.ts
+++ b/ui/src/app/schema-form/service/schema.service.ts
@@ -31,7 +31,8 @@ export class SchemaService {
                 Object
                     .keys(condition.properties)
                     .some(
-                        key => values.hasOwnProperty(key) ? condition.properties[key].enum[0] === values[key] : false
+                        key => values.hasOwnProperty(key) && condition.properties[key].enum ?
+                            condition.properties[key].enum[0] === values[key] : false
                     )
             );
             currentConditions.forEach(el => {
diff --git a/ui/src/app/schema-form/widget/datalist/datalist.component.html b/ui/src/app/schema-form/widget/datalist/datalist.component.html
index 6ec585342..ece3d7878 100644
--- a/ui/src/app/schema-form/widget/datalist/datalist.component.html
+++ b/ui/src/app/schema-form/widget/datalist/datalist.component.html
@@ -21,4 +21,10 @@
         role="textbox"
         [attr.aria-label]="schema.title | translate">
     </auto-complete>
+    <small class="form-text text-danger" *ngIf="errorMessages && errorMessages.length && control.touched">
+        <ng-container *ngFor="let error of errorMessages; let first=first;">
+            <ng-container *ngIf="!first">, </ng-container>
+            <translate-i18n [key]="getError(error)">error</translate-i18n>
+        </ng-container>
+    </small>
 </div>
diff --git a/ui/src/app/schema-form/widget/datalist/datalist.component.ts b/ui/src/app/schema-form/widget/datalist/datalist.component.ts
index 3393bd2c5..aecbe2fc3 100644
--- a/ui/src/app/schema-form/widget/datalist/datalist.component.ts
+++ b/ui/src/app/schema-form/widget/datalist/datalist.component.ts
@@ -2,6 +2,7 @@ import { Component, AfterViewInit } from '@angular/core';
 
 import { ControlWidget } from 'ngx-schema-form';
 import { SchemaService } from '../../service/schema.service';
+import { HARD_CODED_REQUIRED_MSG } from '../../model/messages';
 
 @Component({
     selector: 'datalist-component',
@@ -26,4 +27,8 @@ export class DatalistComponent extends ControlWidget implements AfterViewInit {
     get required(): boolean {
         return this.widgetService.isRequired(this.formProperty);
     }
+
+    getError(error: string): string {
+        return HARD_CODED_REQUIRED_MSG.test(error) ? 'message.required' : error;
+    }
 }
diff --git a/ui/src/app/schema-form/widget/select/select.component.html b/ui/src/app/schema-form/widget/select/select.component.html
index e66a83350..a7d1dd2ff 100644
--- a/ui/src/app/schema-form/widget/select/select.component.html
+++ b/ui/src/app/schema-form/widget/select/select.component.html
@@ -42,7 +42,7 @@
     <small class="form-text text-danger" *ngIf="errorMessages && errorMessages.length && control.touched">
         <ng-container *ngFor="let error of errorMessages; let first=first;">
             <ng-container *ngIf="!first">, </ng-container>
-            <translate-i18n [key]="error">error</translate-i18n>
+            <translate-i18n [key]="getError(error)">error</translate-i18n>
         </ng-container>
     </small>
     <input *ngIf="schema.readOnly" [attr.name]="name" type="hidden" [formControl]="control">
diff --git a/ui/src/app/schema-form/widget/select/select.component.ts b/ui/src/app/schema-form/widget/select/select.component.ts
index 5c6a2b65d..ecd50a75b 100644
--- a/ui/src/app/schema-form/widget/select/select.component.ts
+++ b/ui/src/app/schema-form/widget/select/select.component.ts
@@ -1,17 +1,21 @@
-import { Component, AfterViewInit } from '@angular/core';
+import { Component, AfterViewInit, OnDestroy } from '@angular/core';
 
 import { SelectWidget } from 'ngx-schema-form';
 import { SchemaService } from '../../service/schema.service';
-import { map, shareReplay } from 'rxjs/operators';
+import { map, shareReplay, startWith } from 'rxjs/operators';
+import { Subscription } from 'rxjs';
+import { HARD_CODED_REQUIRED_MSG } from '../../model/messages';
 
 @Component({
     selector: 'select-component',
     templateUrl: `./select.component.html`
 })
-export class CustomSelectComponent extends SelectWidget implements AfterViewInit {
+export class CustomSelectComponent extends SelectWidget implements AfterViewInit, OnDestroy {
 
     options$: any;
 
+    errorSub: Subscription;
+
     constructor(
         private widgetService: SchemaService
     ) {
@@ -38,9 +42,23 @@ export class CustomSelectComponent extends SelectWidget implements AfterViewInit
                     )
                 );
         }
+
+        this.errorSub = this.control.valueChanges.pipe(startWith(this.control.value)).subscribe(v => {
+            if (!v && this.required && !this.errorMessages.some(msg => HARD_CODED_REQUIRED_MSG.test(msg))) {
+                this.errorMessages.push('message.required');
+            }
+        });
+    }
+
+    ngOnDestroy(): void {
+        this.errorSub.unsubscribe();
     }
 
     get required(): boolean {
         return this.widgetService.isRequired(this.formProperty);
     }
+
+    getError(error: string): string {
+        return HARD_CODED_REQUIRED_MSG.test(error) ? 'message.required' : error;
+    }
 }
diff --git a/ui/src/app/schema-form/widget/string/string.component.html b/ui/src/app/schema-form/widget/string/string.component.html
index 26964a59f..4986846ff 100644
--- a/ui/src/app/schema-form/widget/string/string.component.html
+++ b/ui/src/app/schema-form/widget/string/string.component.html
@@ -13,6 +13,7 @@
         validate="true"
         [attr.readonly]="schema.readOnly?true:null"
         class="text-widget.id textline-widget form-control"
+        [class.is-invalid]="control.touched && !control.value && errorMessages.length"
         [attr.type]="this.getInputType()"
         [attr.id]="id"
         [formControl]="control"
@@ -25,7 +26,7 @@
     <small class="form-text text-danger" *ngIf="errorMessages && errorMessages.length && control.touched">
         <ng-container *ngFor="let error of errorMessages; let first=first;">
             <ng-container *ngIf="!first">, </ng-container>
-            <translate-i18n [key]="error">error</translate-i18n>
+            <translate-i18n [key]="getError(error)">error</translate-i18n>
         </ng-container>
     </small>
     <small class="form-text text-secondary"
diff --git a/ui/src/app/schema-form/widget/string/string.component.ts b/ui/src/app/schema-form/widget/string/string.component.ts
index 2de93e371..f144e6f8e 100644
--- a/ui/src/app/schema-form/widget/string/string.component.ts
+++ b/ui/src/app/schema-form/widget/string/string.component.ts
@@ -1,14 +1,20 @@
-import { Component } from '@angular/core';
+import { Component, AfterViewInit, OnDestroy } from '@angular/core';
 import { StringWidget } from 'ngx-schema-form';
 import { Validators } from '@angular/forms';
 import { SchemaService } from '../../service/schema.service';
+import { startWith } from 'rxjs/operators';
+import { Subscription } from 'rxjs';
+
+import { HARD_CODED_REQUIRED_MSG, REQUIRED_MSG_OVERRIDE } from '../../model/messages';
 
 @Component({
     selector: 'custom-string',
     templateUrl: `./string.component.html`,
     styleUrls: ['../widget.component.scss']
 })
-export class CustomStringComponent extends StringWidget {
+export class CustomStringComponent extends StringWidget implements AfterViewInit, OnDestroy {
+
+    errorSub: Subscription;
 
     constructor(
         private widgetService: SchemaService
@@ -16,7 +22,33 @@ export class CustomStringComponent extends StringWidget {
         super();
     }
 
+    ngAfterViewInit(): void {
+        super.ngAfterViewInit();
+        let listener = this.formProperty.parent ? this.formProperty.parent : this.control;
+        this.errorSub = listener.valueChanges.pipe(startWith(listener.value)).subscribe(v => {
+            if (!this.control.value
+                    && this.required
+                    && !this.errorMessages.some(msg => HARD_CODED_REQUIRED_MSG.test(msg))
+                    && this.errorMessages.indexOf(REQUIRED_MSG_OVERRIDE) < 0) {
+                this.errorMessages.push(REQUIRED_MSG_OVERRIDE);
+            }
+            if (!this.required) {
+                this.errorMessages = this.errorMessages.filter(e => e !== REQUIRED_MSG_OVERRIDE);
+            }
+        });
+    }
+
+    ngOnDestroy(): void {
+        this.errorSub.unsubscribe();
+    }
+
     get required(): boolean {
-        return this.widgetService.isRequired(this.formProperty);
+        const req = this.widgetService.isRequired(this.formProperty);
+
+        return req;
+    }
+
+    getError(error: string): string {
+        return HARD_CODED_REQUIRED_MSG.test(error) ? REQUIRED_MSG_OVERRIDE : error;
     }
 }
diff --git a/ui/src/app/schema-form/widget/textarea/textarea.component.html b/ui/src/app/schema-form/widget/textarea/textarea.component.html
index fb8164600..d47d6007d 100644
--- a/ui/src/app/schema-form/widget/textarea/textarea.component.html
+++ b/ui/src/app/schema-form/widget/textarea/textarea.component.html
@@ -18,4 +18,10 @@
         [rows]="schema.widget.rows || 5"
         [formControl]="control"
         [attr.aria-label]="schema.title"></textarea>
+    <small class="form-text text-danger" *ngIf="errorMessages && errorMessages.length && control.touched">
+        <ng-container *ngFor="let error of errorMessages; let first=first;">
+            <ng-container *ngIf="!first">, </ng-container>
+            <translate-i18n [key]="getError(error)">error</translate-i18n>
+        </ng-container>
+    </small>
 </div>
diff --git a/ui/src/app/schema-form/widget/textarea/textarea.component.ts b/ui/src/app/schema-form/widget/textarea/textarea.component.ts
index 0f68e524f..fdbce4b35 100644
--- a/ui/src/app/schema-form/widget/textarea/textarea.component.ts
+++ b/ui/src/app/schema-form/widget/textarea/textarea.component.ts
@@ -1,20 +1,43 @@
-import { Component } from '@angular/core';
+import { Component, AfterViewInit, OnDestroy } from '@angular/core';
 
 import { TextAreaWidget } from 'ngx-schema-form';
 import { SchemaService } from '../../service/schema.service';
+import { Subscription } from 'rxjs';
+import { startWith } from 'rxjs/operators';
+import { HARD_CODED_REQUIRED_MSG } from '../../model/messages';
 
 @Component({
   selector: 'textarea-component',
   templateUrl: `./textarea.component.html`
 })
-export class CustomTextAreaComponent extends TextAreaWidget {
+export class CustomTextAreaComponent extends TextAreaWidget implements AfterViewInit, OnDestroy {
+
+    errorSub: Subscription;
+
     constructor(
         private widgetService: SchemaService
     ) {
         super();
     }
 
+    ngAfterViewInit(): void {
+        super.ngAfterViewInit();
+        this.errorSub = this.control.valueChanges.pipe(startWith(this.control.value)).subscribe(v => {
+            if (!v && this.required && !this.errorMessages.some(msg => HARD_CODED_REQUIRED_MSG.test(msg))) {
+                this.errorMessages.push('message.required');
+            }
+        });
+    }
+
+    ngOnDestroy(): void {
+        this.errorSub.unsubscribe();
+    }
+
     get required(): boolean {
         return this.widgetService.isRequired(this.formProperty);
     }
+
+    getError(error: string): string {
+        return error.match('required').length ? 'message.required' : error;
+    }
 }
diff --git a/ui/src/app/shared/autocomplete/autocomplete.component.scss b/ui/src/app/shared/autocomplete/autocomplete.component.scss
index b721d9ea2..f794dce0c 100644
--- a/ui/src/app/shared/autocomplete/autocomplete.component.scss
+++ b/ui/src/app/shared/autocomplete/autocomplete.component.scss
@@ -1,5 +1,6 @@
 @import "~bootstrap/scss/functions";
 @import "~bootstrap/scss/variables";
+@import "../../../theme/palette";
 
 .dropdown.form-group {
     margin-bottom: 0px;
@@ -14,4 +15,16 @@
     .btn-outline-secondary {
         border-color: $input-border-color;
     }
+
+    &.is-invalid {
+        input.form-control {
+            border-color: $brand-danger;
+        }
+    }
+
+    &.is-valid {
+        input.form-control {
+            border-color: $brand-success;
+        }
+    }
 }
\ No newline at end of file
diff --git a/ui/src/assets/schema/provider/filebacked-http-filters.schema.json b/ui/src/assets/schema/provider/filebacked-http-filters.schema.json
index 4bb2f399c..820063bfa 100644
--- a/ui/src/assets/schema/provider/filebacked-http-filters.schema.json
+++ b/ui/src/assets/schema/provider/filebacked-http-filters.schema.json
@@ -50,8 +50,7 @@
                             "title": "label.certificate-file",
                             "description": "tooltip.certificate-file",
                             "type": "string",
-                            "widget": "textline",
-                            "default": ""
+                            "widget": "textline"
                         }
                     },
                     "anyOf": [
@@ -59,6 +58,10 @@
                             "properties": {
                                 "requireSignedRoot": {
                                     "enum": [ true ]
+                                },
+                                "certificateFile": {
+                                    "minLength": 1,
+                                    "type": "string"
                                 }
                             },
                             "required": [