BATCH-762: cleanup and java doc changes

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

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2006-2008 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.springframework.batch.core.repository.dao;
 
 import java.sql.ResultSet;

spring-batch-core/src/main/java/org/springframework/batch/core/repository/support/ExecutionContextStringSerializer.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2006-2008 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.springframework.batch.core.repository.support;
 
 import java.util.Map;
@@ -7,8 +23,20 @@ import java.util.Map;
  */
 public interface ExecutionContextStringSerializer {
 
+	/**
+	 * Serialize the context to a string representation
+	 *
+	 * @param context the object that should be serialized
+	 * @return the serialization string
+	 */
 	String serialize(Map<String, Object> context);
 
+	/**
+	 * De-serialize the context from a string representation
+	 *
+	 * @param context the serialization string that should be de-serialized
+	 * @return the de-serialized context map
+	 */
 	Map<String, Object> deserialize(String context);
 	
 }

spring-batch-core/src/main/java/org/springframework/batch/core/repository/support/XStreamExecutionContextStringSerializer.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2006-2008 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.springframework.batch.core.repository.support;
 
 import com.thoughtworks.xstream.converters.reflection.ReflectionProvider;