Removed serialisable check on ExecutionContext entries

The serialisation/deserialisation implementation is injectable, so it does not make sense to enforce the presence of this interface

spring-batch-core/src/main/java/org/springframework/batch/core/repository/dao/DefaultExecutionContextSerializer.java

@@ -18,6 +18,7 @@ package org.springframework.batch.core.repository.dao;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.io.Serializable;
 import java.util.Map;
 
 import org.springframework.batch.core.repository.ExecutionContextSerializer;
@@ -54,6 +55,9 @@ public class DefaultExecutionContextSerializer implements ExecutionContextSerial
 		Assert.notNull(context);
 		Assert.notNull(out);
 
+		for(Object value : context.values()) {
+			Assert.isInstanceOf(Serializable.class, value, "Value: [ " + value + "must be serializable.");
+		}
 		serializer.serialize(context, out);
 	}
 

spring-batch-core/src/test/java/org/springframework/batch/core/repository/dao/DefaultExecutionContextSerializerTests.java

@@ -60,6 +60,14 @@ public class DefaultExecutionContextSerializerTests {
 		compareContexts(m1, m2);
 	}
 
+	@Test(expected = IllegalArgumentException.class)
+	public void testSerializeNonSerializable() throws Exception {
+		Map<String, Object> m1 = new HashMap<String, Object>();
+		m1.put("object1", new Object());
+
+		serializer.serialize(m1, new ByteArrayOutputStream());
+	}
+
 	@Test
 	public void testComplexObject() throws Exception {
 		Map<String, Object> m1 = new HashMap<String, Object>();