Prevent NPE in AbstractBeanContainer.getType() method (#15173).

Change-Id: Ieaed329ed85c68d0da8bd169b4cc5c5886dde212

3 files changed, 32 insertions, 2 deletions

diff --git a/server/src/com/vaadin/data/util/AbstractBeanContainer.java b/server/src/com/vaadin/data/util/AbstractBeanContainer.java
index adf6313770..7d7d71c423 100644
--- a/server/src/com/vaadin/data/util/AbstractBeanContainer.java
+++ b/server/src/com/vaadin/data/util/AbstractBeanContainer.java
@@ -152,7 +152,7 @@ public abstract class AbstractBeanContainer<IDTYPE, BEANTYPE> extends
      * A description of the properties found in beans of type {@link #type}.
      * Determines the property ids that are present in the container.
      */
-    private LinkedHashMap<String, VaadinPropertyDescriptor<BEANTYPE>> model;
+    private final LinkedHashMap<String, VaadinPropertyDescriptor<BEANTYPE>> model;
 
     /**
      * Constructs a {@code AbstractBeanContainer} for beans of the given type.
@@ -178,7 +178,11 @@ public abstract class AbstractBeanContainer<IDTYPE, BEANTYPE> extends
      */
     @Override
     public Class<?> getType(Object propertyId) {
-        return model.get(propertyId).getPropertyType();
+        VaadinPropertyDescriptor<BEANTYPE> descriptor = model.get(propertyId);
+        if (descriptor == null) {
+            return null;
+        }
+        return descriptor.getPropertyType();
     }
 
     /**
diff --git a/server/tests/src/com/vaadin/data/util/BeanContainerTest.java b/server/tests/src/com/vaadin/data/util/BeanContainerTest.java
index 4e0e98ec43..f22ab8478e 100644
--- a/server/tests/src/com/vaadin/data/util/BeanContainerTest.java
+++ b/server/tests/src/com/vaadin/data/util/BeanContainerTest.java
@@ -68,6 +68,19 @@ public class BeanContainerTest extends AbstractBeanContainerTest {
         return false;
     }
 
+    public void testGetType_existingProperty_typeReturned() {
+        BeanContainer<String, ClassName> container = getContainer();
+        Assert.assertEquals(
+                "Unexpected type is returned for property 'simpleName'",
+                String.class, container.getType("simpleName"));
+    }
+
+    public void testGetType_notExistingProperty_nullReturned() {
+        BeanContainer<String, ClassName> container = getContainer();
+        Assert.assertNull("Not null type is returned for property ''",
+                container.getType(""));
+    }
+
     public void testBasicOperations() {
         testBasicContainerOperations(getContainer());
     }
diff --git a/server/tests/src/com/vaadin/data/util/BeanItemContainerTest.java b/server/tests/src/com/vaadin/data/util/BeanItemContainerTest.java
index b58d962d96..01c282e294 100644
--- a/server/tests/src/com/vaadin/data/util/BeanItemContainerTest.java
+++ b/server/tests/src/com/vaadin/data/util/BeanItemContainerTest.java
@@ -71,6 +71,19 @@ public class BeanItemContainerTest extends AbstractBeanContainerTest {
         return false;
     }
 
+    public void testGetType_existingProperty_typeReturned() {
+        BeanItemContainer<ClassName> container = getContainer();
+        Assert.assertEquals(
+                "Unexpected type is returned for property 'simpleName'",
+                String.class, container.getType("simpleName"));
+    }
+
+    public void testGetType_notExistingProperty_nullReturned() {
+        BeanItemContainer<ClassName> container = getContainer();
+        Assert.assertNull("Not null type is returned for property ''",
+                container.getType(""));
+    }
+
     public void testBasicOperations() {
         testBasicContainerOperations(getContainer());
     }