Fix Javadoc issue preventing the release and add licence headers

Author: jeanbisutti

core/src/main/java/org/quickperf/writer/DefaultWriterFactory.java

@@ -1,3 +1,14 @@
+/*
+ * 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.
+ *
+ * Copyright 2019-2020 the original author or authors.
+ */
+
 package org.quickperf.writer;
 
 import java.io.PrintWriter;

core/src/main/java/org/quickperf/writer/WriterFactory.java

@@ -1,3 +1,14 @@
+/*
+ * 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.
+ *
+ * Copyright 2019-2020 the original author or authors.
+ */
+
 package org.quickperf.writer;
 
 import java.io.IOException;
@@ -10,10 +21,11 @@
 public interface WriterFactory {
 
     /**
+     * <p>
      * This method is called by QuickPerf to build the <code>Writer</code>.
      * </p>
-     * In case an exception is raised in the process, QuickPerf will use the default <code>Writer</code>
-     * built on <code>System.out</code>.
+     * <p>In case an exception is raised in the process, QuickPerf will use the default <code>Writer</code>
+     * built on <code>System.out</code>.<p>
      *
      * @return an instance of the <code>Writer</code> used by QuickPerf to write messages
      * @throws IOException

jvm/jvm-annotations/src/main/java/org/quickperf/jvm/annotations/MeasureHeapAllocation.java

@@ -37,15 +37,15 @@
     String format() default QUICK_PERF_MEASURED_HEAP_ALLOCATION_DEFAULT_FORMAT;
 
     /**
-     * Allows you to provide a way to build a <code>Writer</code> instance to print your messages.
+     * <p>Allows you to provide a way to build a <code>Writer</code> instance to print your messages.
      * The <code>WriterFactory</code> class is used to built this <code>Writer</code>.
      * </p>
-     * This <code>WriterFactory</code> class is constructed using reflection, so it should have an empty
+     * <p>This <code>WriterFactory</code> class is constructed using reflection, so it should have an empty
      * constructor. If it does not an exception will be raised and the default <code>Writer</code> will be used.
      * </p>
-     * The default value <code>DefaultWriterFactory</code> builds a <code>Writer</code> that writes to
+     * <p>The default value <code>DefaultWriterFactory</code> builds a <code>Writer</code> that writes to
      * <code>System.out</code>. In case an exception is raised in the use of a provided factory, the system
-     * falls back on this default value.
+     * falls back on this default value.</p>
      *
      * @return a class that implements the <code>WriterFactory</code> interface
      * @see WriterFactory