diff --git a/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/BooleanDataType.java b/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/BooleanDataType.java
index 36eeed2658..2fe2a42778 100644
--- a/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/BooleanDataType.java
+++ b/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/BooleanDataType.java
@@ -41,7 +41,9 @@ public void writeExternal(ObjectOutput out) throws IOException {
 
     @Override
     public boolean verifyDataType(final Object value) {
-        if ( value instanceof Boolean ) {
+        if (value == null) {
+            return true;
+        } else if (value instanceof Boolean || "true".equalsIgnoreCase(value.toString()) || "false".equalsIgnoreCase(value.toString())) {
             return true;
         }
         return false;
diff --git a/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/FloatDataType.java b/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/FloatDataType.java
index e3fa20d017..ae12910029 100644
--- a/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/FloatDataType.java
+++ b/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/FloatDataType.java
@@ -20,6 +20,7 @@
 import java.io.ObjectInput;
 import java.io.ObjectOutput;
 
+import org.apache.commons.lang3.StringUtils;
 import org.jbpm.process.core.datatype.DataType;
 
 /**
@@ -41,12 +42,15 @@ public void writeExternal(ObjectOutput out) throws IOException {
 
     @Override
     public boolean verifyDataType(final Object value) {
-        if ( value instanceof Float ) {
-            return true;
-        } else if ( value == null ) {
+        if (value == null) {
             return true;
         } else {
-            return false;
+            try {
+                Float.parseFloat(value.toString());
+                return true;
+            } catch (NumberFormatException e) {
+                return false;
+            }
         }
     }
 
diff --git a/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/IntegerDataType.java b/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/IntegerDataType.java
index a0a2194e06..fe246f5718 100644
--- a/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/IntegerDataType.java
+++ b/jbpm-flow/src/main/java/org/jbpm/process/core/datatype/impl/type/IntegerDataType.java
@@ -41,12 +41,15 @@ public void writeExternal(ObjectOutput out) throws IOException {
 
     @Override
     public boolean verifyDataType(final Object value) {
-        if ( value instanceof Integer ) {
-            return true;
-        } else if ( value == null ) {
+        if (value == null) {
             return true;
         } else {
-            return false;
+            try {
+                Integer.parseInt(value.toString());
+                return true;
+            } catch (NumberFormatException e) {
+                return false;
+            }
         }
     }
 
@@ -74,5 +77,4 @@ public Object valueOf(String value) {
             return value;
         }
     }
-
 }