diff --git a/src/components/src/main/java/org/apache/jmeter/timers/ConstantThroughputTimerBeanInfo.java b/src/components/src/main/java/org/apache/jmeter/timers/ConstantThroughputTimerBeanInfo.java
index 0d28dffb43..19c53af136 100644
--- a/src/components/src/main/java/org/apache/jmeter/timers/ConstantThroughputTimerBeanInfo.java
+++ b/src/components/src/main/java/org/apache/jmeter/timers/ConstantThroughputTimerBeanInfo.java
@@ -18,14 +18,19 @@
 package org.apache.jmeter.timers;
 
 import java.beans.PropertyDescriptor;
+import java.util.function.Function;
 
 import org.apache.jmeter.testbeans.BeanInfoSupport;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * BeanInfo for the ConstantThroughputTimer.
  */
 public class ConstantThroughputTimerBeanInfo extends BeanInfoSupport {
 
+    private static Logger log = LoggerFactory.getLogger(ConstantThroughputTimerBeanInfo.class);
+
     public ConstantThroughputTimerBeanInfo() {
         super(ConstantThroughputTimer.class);
 
@@ -36,10 +41,23 @@ public class ConstantThroughputTimerBeanInfo extends BeanInfoSupport {
         PropertyDescriptor p = property("throughput"); //$NON-NLS-1$
         p.setValue(NOT_UNDEFINED, Boolean.TRUE);
         p.setValue(DEFAULT, 0.0);
+        p.setValue(VALIDATOR, (Function<Object, Boolean>) ConstantThroughputTimerBeanInfo::validateThroughput);
 
         p = property("calcMode", ConstantThroughputTimer.Mode.class); //$NON-NLS-1$
         p.setValue(DEFAULT, ConstantThroughputTimer.Mode.ThisThreadOnly.ordinal());
         p.setValue(NOT_UNDEFINED, Boolean.TRUE); // must be defined
     }
 
+    private static boolean validateThroughput(Object o) {
+        try {
+            double value = Double.parseDouble(o.toString());
+            if (value < 0) {
+                log.warn("Number must not be less than zero: [{}]", value);
+            }
+        } catch (NumberFormatException e) {
+            log.warn("No valid number: [{}]", o);
+        }
+        return false;
+    }
+
 }
diff --git a/src/core/src/main/java/org/apache/jmeter/testbeans/BeanInfoSupport.java b/src/core/src/main/java/org/apache/jmeter/testbeans/BeanInfoSupport.java
index 5971b31ef2..a00dc0717a 100644
--- a/src/core/src/main/java/org/apache/jmeter/testbeans/BeanInfoSupport.java
+++ b/src/core/src/main/java/org/apache/jmeter/testbeans/BeanInfoSupport.java
@@ -91,6 +91,9 @@ public abstract class BeanInfoSupport extends SimpleBeanInfo {
     /** TextEditor property */
     public static final String TEXT_LANGUAGE = GenericTestBeanCustomizer.TEXT_LANGUAGE;
 
+    /** An optional validator, that is a Function<Object, Boolean> **/
+    public static final String VALIDATOR = GenericTestBeanCustomizer.VALIDATOR;
+
     /** The BeanInfo for our class as obtained by the introspector. */
     private final BeanInfo rootBeanInfo;
 
diff --git a/src/core/src/main/java/org/apache/jmeter/testbeans/TestBeanHelper.java b/src/core/src/main/java/org/apache/jmeter/testbeans/TestBeanHelper.java
index fa19b19d8c..16b4a848fc 100644
--- a/src/core/src/main/java/org/apache/jmeter/testbeans/TestBeanHelper.java
+++ b/src/core/src/main/java/org/apache/jmeter/testbeans/TestBeanHelper.java
@@ -25,6 +25,7 @@ import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.function.Function;
 
 import org.apache.jmeter.testbeans.gui.GenericTestBeanCustomizer;
 import org.apache.jmeter.testbeans.gui.TableEditor;
@@ -83,6 +84,7 @@ public class TestBeanHelper {
                 Class<?> type = desc.getPropertyType();
                 Object value = unwrapProperty(desc, jprop, type);
 
+                validateObjectValue(desc, jprop, value);
                 if (log.isDebugEnabled()) {
                     log.debug("Setting {}={}", jprop.getName(), value);
                 }
@@ -105,6 +107,17 @@ public class TestBeanHelper {
         }
     }
 
+    private static void validateObjectValue(PropertyDescriptor desc, JMeterProperty jprop, Object value) {
+        Object validator = desc.getValue(BeanInfoSupport.VALIDATOR);
+        if (validator instanceof Function) {
+            @SuppressWarnings("unchecked")
+            Function<Object, Boolean> validatorFunction = (Function<Object, Boolean>) validator;
+            if (!validatorFunction.apply(value)) {
+                log.warn("Invalid value [{}] for property [{}]", value, jprop.getName());
+            }
+        }
+    }
+
     private static Object unwrapProperty(PropertyDescriptor desc, JMeterProperty jprop, Class<?> type) {
         Object value;
         if(jprop instanceof TestElementProperty)
diff --git a/src/core/src/main/java/org/apache/jmeter/testbeans/gui/GenericTestBeanCustomizer.java b/src/core/src/main/java/org/apache/jmeter/testbeans/gui/GenericTestBeanCustomizer.java
index 25ee55cfb5..e3aca1ad6e 100644
--- a/src/core/src/main/java/org/apache/jmeter/testbeans/gui/GenericTestBeanCustomizer.java
+++ b/src/core/src/main/java/org/apache/jmeter/testbeans/gui/GenericTestBeanCustomizer.java
@@ -96,7 +96,7 @@ import org.slf4j.LoggerFactory;
  * </dl>
  */
 public class GenericTestBeanCustomizer extends JPanel implements SharedCustomizer {
-    private static final long serialVersionUID = 241L;
+    private static final long serialVersionUID = 242L;
 
     private static final Logger log = LoggerFactory.getLogger(GenericTestBeanCustomizer.class);
 
@@ -160,6 +160,8 @@ public class GenericTestBeanCustomizer extends JPanel implements SharedCustomize
 
     public static final String DEFAULT_GROUP = "";
 
+    public static final String VALIDATOR = "validator";
+
     @SuppressWarnings("unused") // TODO - use or remove
     private int scrollerCount = 0;