Use Java logging API instead of log4j.

Nathanael Jourdane
1 parent 4ca7853c
Showing 17 changed files with 90 additions and 199 deletions Show diff stats
log4j2.xml
pom.xml
src/main/java/eu/omp/irap/vespa/epntapclient/EpnTapMainApp.java
src/main/java/eu/omp/irap/vespa/epntapclient/controller/EpnTapController.java
src/main/java/eu/omp/irap/vespa/epntapclient/utils/Log.java
src/main/java/eu/omp/irap/vespa/epntapclient/utils/Queries.java
src/main/java/eu/omp/irap/vespa/epntapclient/view/EpnTapMainView.java
src/main/java/eu/omp/irap/vespa/epntapclient/view/ParamField.java
src/main/java/eu/omp/irap/vespa/epntapclient/view/RequestView.java
src/main/java/eu/omp/irap/vespa/epntapclient/votable/Utils.java
src/main/java/eu/omp/irap/vespa/epntapclient/votable/VOTableApp.java
src/main/java/eu/omp/irap/vespa/epntapclient/votable/controller/VOTableConnection.java
src/main/java/eu/omp/irap/vespa/epntapclient/votable/controller/VOTableController.java
src/main/java/eu/omp/irap/vespa/epntapclient/votable/controller/VOTableDataParser.java
src/main/java/eu/omp/irap/vespa/epntapclient/votable/controller/VOTableException.java
src/main/java/eu/omp/irap/vespa/epntapclient/votable/controller/VOTableParser.java
src/main/java/eu/omp/irap/vespa/epntapclient/votable/view/VOTableView.java
@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Configuration>
-  <Appenders>
-    <Console name="Console">
-      <PatternLayout pattern="%highlight{%d{HH:mm:ss.SSS} %p %c{1.} [%t] %m%n}{STYLE=Logback}"/>
-    </Console>
-    <File name="File" fileName="/tmp/EpnTAPClient.log">
-      <PatternLayout pattern="%d{HH:mm:ss.SSS} %p %c{1.} [%t] %m%n"/>
-    </File>
-  </Appenders>
-  <Loggers>
-    <Root level="trace">
-      <AppenderRef ref="Console"/>
-      <AppenderRef ref="File"/>
-    </Root>
-  </Loggers>
-</Configuration>
@@ -90,17 +90,6 @@
 				<version>1.7</version>
 				<executions>
 					<execution>
-						<phase>process-classes</phase>
-						<configuration>
-							<tasks>
-								<copy file="${basedir}/log4j2.xml" todir="${basedir}/target/classes/" />
-							</tasks>
-						</configuration>
-						<goals>
-							<goal>run</goal>
-						</goals>
-					</execution>
-					<execution>
 						<id>remove-episode</id>
 						<phase>process-sources</phase>
 						<goals>
@@ -191,16 +180,6 @@
 			<version>2.2.2</version>
 			<scope>compile</scope>
 		</dependency>
-		<dependency>
-			<groupId>org.apache.logging.log4j</groupId>
-			<artifactId>log4j-api</artifactId>
-			<version>2.5</version>
-		</dependency>
-		<dependency>
-			<groupId>org.apache.logging.log4j</groupId>
-			<artifactId>log4j-core</artifactId>
-			<version>2.5</version>
-		</dependency>
 	</dependencies>
 	<profiles>
 		<profile>
@@ -16,12 +16,11 @@
 package eu.omp.irap.vespa.epntapclient;
+import java.util.logging.Logger;
+
 import javax.swing.JFrame;
 import javax.swing.SwingUtilities;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
 import eu.omp.irap.vespa.epntapclient.controller.EpnTapController;
 /**
@@ -30,9 +29,8 @@ import eu.omp.irap.vespa.epntapclient.controller.EpnTapController;
  * @author N. Jourdane
  */
 public class EpnTapMainApp {
-
-	/** The logger for this class. */
-	private static final Logger logger = LogManager.getRootLogger();
+	/** The logger for the class EpnTapMainApp. */
+	private static final Logger logger = Logger.getLogger(EpnTapMainApp.class.getName());
 	/** Constructor to hide the implicit public one. */
 	private EpnTapMainApp() {
@@ -16,8 +16,7 @@
 package eu.omp.irap.vespa.epntapclient.controller;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import java.util.logging.Logger;
 import eu.omp.irap.vespa.epntapclient.utils.Const;
 import eu.omp.irap.vespa.epntapclient.utils.Queries;
@@ -30,8 +29,8 @@ import eu.omp.irap.vespa.epntapclient.votable.view.VOTableView;
  * @author N. Jourdane
  */
 public class EpnTapController {
-	/** The logger for this class. */
-	private static final Logger logger = LogManager.getLogger(EpnTapController.class);
+	/** The logger for the class EpnTapController. */
+	Logger logger = Logger.getLogger(EpnTapController.class.getName());
 	/** The view of EPN-TAP application. */
 	EpnTapMainView view;
@@ -52,8 +51,6 @@ public class EpnTapController {
 	 * Method constructor
 	 */
 	public EpnTapController() {
-
-		// TODO: Get only *EPN* TAP services
 		servicesController = new VOTableController(Const.DEFAULT_REGISTRY_URL, "ADQL",
 				Queries.GET_EPN_TAP_SERVICES);
@@ -1,75 +0,0 @@
-/*
- * This file is a part of EpnTAPClient.
- * This program aims to provide EPN-TAP support for software clients, like CASSIS spectrum analyzer.
- * See draft specifications: https://voparis-confluence.obspm.fr/pages/viewpage.action?pageId=559861
- * Copyright (C) 2016 Institut de Recherche en Astrophysique et Planétologie.
- * 
- * This program is free software: you can
- * redistribute it and/or modify it under the terms of the GNU General Public License as published
- * by the Free Software Foundation, either version 3 of the License, or (at your option) any later
- * version. This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
- * PURPOSE. See the GNU General Public License for more details. You should have received a copy of
- * the GNU General Public License along with this program. If not, see
- * <http://www.gnu.org/licenses/>.
- */
-
-package eu.omp.irap.vespa.epntapclient.utils;
-
-import java.io.FileWriter;
-import java.io.IOException;
-
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-
-import eu.omp.irap.vespa.epntapclient.EpnTapMainApp;
-
-/**
- * Simple class to provide logging features
- * 
- * @author N. Jourdane
- */
-public class Log {
-	/** The logger for this class. */
-	private static final Logger logger = LogManager.getLogger(EpnTapMainApp.class);
-
-	/** Constructor to hide the implicit public one. */
-	private Log() {
-	}
-
-	/**
-	 * Print the specified object in JSON format in a file on the temp directory. The default file
-	 * name is "object.json"
-	 * 
-	 * @param obj the object to print in a file.
-	 * @return The path of the file.
-	 */
-	public static String printObject(Object obj) {
-		return printObject("object", obj);
-	}
-
-	/**
-	 * Print the specified object in JSON format in a file on the temp directory.
-	 * 
-	 * @param title The name of the file.
-	 * @param obj the object to print in a file.
-	 * @return The path of the file.
-	 */
-	public static String printObject(String title, Object obj) {
-		Gson gson = new GsonBuilder().setPrettyPrinting().create();
-		String json = gson.toJson(obj);
-		String path = Const.TMP_DIR + "/" + title + ".json";
-		try (FileWriter writer = new FileWriter(path)) {
-			writer.write(json);
-
-		} catch (IOException e) {
-			logger.error("Can not print in the file " + path, e);
-		}
-
-		return path;
-	}
-
-}
@@ -19,6 +19,7 @@ package eu.omp.irap.vespa.epntapclient.utils;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.logging.Logger;
 import eu.omp.irap.vespa.epntapclient.votable.Utils.StringJoiner;
@@ -26,6 +27,8 @@ import eu.omp.irap.vespa.epntapclient.votable.Utils.StringJoiner;
  * @author N. Jourdane
  */
 public final class Queries {
+	/** The logger for the class Queries. */
+	Logger logger = Logger.getLogger(Queries.class.getName());
 	// AMDA access_url: http://cdpp-epntap.cesr.fr/__system__/tap/run/tap
 	// AMDA table name: amdadb.epn_core
@@ -18,6 +18,7 @@ package eu.omp.irap.vespa.epntapclient.view;
 import java.awt.BorderLayout;
 import java.awt.Dimension;
+import java.util.logging.Logger;
 import javax.swing.JOptionPane;
 import javax.swing.JPanel;
@@ -25,9 +26,6 @@ import javax.swing.JSplitPane;
 import javax.swing.event.ListSelectionEvent;
 import javax.swing.event.ListSelectionListener;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
 import eu.omp.irap.vespa.epntapclient.controller.EpnTapController;
 import eu.omp.irap.vespa.epntapclient.votable.view.VOTableView;
@@ -35,9 +33,8 @@ import eu.omp.irap.vespa.epntapclient.votable.view.VOTableView;
  * @author N. Jourdane
  */
 public class EpnTapMainView extends JPanel {
-
-	/** The logger for this class. */
-	static final Logger logger = LogManager.getLogger(EpnTapMainView.class);
+	/** The logger for the class EpnTapMainView. */
+	private static final Logger logger = Logger.getLogger(EpnTapMainView.class.getName());
 	/** The serial version UID (affected with a random number). */
 	private static final long serialVersionUID = -1233290271099283814L;
@@ -11,6 +11,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
+import java.util.logging.Logger;
 import javax.swing.BoxLayout;
 import javax.swing.JComboBox;
@@ -21,9 +22,6 @@ import javax.swing.SwingUtilities;
 import javax.swing.event.DocumentEvent;
 import javax.swing.event.DocumentListener;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
 import com.google.gson.JsonArray;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
@@ -33,9 +31,8 @@ import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableException.BadReq
 import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableException.HTTPRequestException;
 public abstract class ParamField extends JPanel {
-
-	/** The logger for this class. */
-	private static final Logger logger = LogManager.getLogger(ParamField.class);
+	/** The logger for the class ParamField. */
+	private static final Logger logger = Logger.getLogger(ParamField.class.getName());
 	private static final int MIN_FIELD_WIDTH = 30;
 	private static final int FIELD_HEIGHT = 20;
@@ -204,7 +201,7 @@ public abstract class ParamField extends JPanel {
 			try {
 				resolverResult = VOTableConnection.sendGet(RESOLVER_URL, "q=\"" + begining + "\"");
 			} catch (HTTPRequestException | BadRequestException e) {
-				logger.fatal("Can not send sersolver query: ", e);
+				logger.severe("Can not send sersolver query: " + e);
 			}
 			JsonObject root = new JsonParser().parse(resolverResult.toString()).getAsJsonObject();
 			int count = Integer.parseInt(root.get("count").toString());
@@ -24,6 +24,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.logging.Logger;
 import javax.swing.BorderFactory;
 import javax.swing.BoxLayout;
@@ -31,9 +32,6 @@ import javax.swing.JButton;
 import javax.swing.JPanel;
 import javax.swing.JTextArea;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
 import eu.omp.irap.vespa.epntapclient.utils.Queries;
 import eu.omp.irap.vespa.epntapclient.view.ParamField.DataProductTypeField;
 import eu.omp.irap.vespa.epntapclient.view.ParamField.DateRangeField;
@@ -45,9 +43,8 @@ import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableException;
  * @author N. Jourdane
  */
 public class RequestView extends JPanel implements ActionListener {
-
-	/** The logger for this class. */
-	private static final Logger logger = LogManager.getLogger(RequestView.class);
+	/** The logger for the class RequestView. */
+	private static final Logger logger = Logger.getLogger(RequestView.class.getName());
 	/** The serial version UID (affected with a random number). */
 	private static final long serialVersionUID = 1262856496809315405L;
@@ -169,7 +166,7 @@ public class RequestView extends JPanel implements ActionListener {
 			try {
 				mainView.getController().sendQuery(queryArea.getText());
 			} catch (VOTableException e) {
-				logger.error("Can not send query when clicking on the send button.", e);
+				logger.warning("Can not send query when clicking on the send button." + e);
 			}
 		}
 	}
@@ -16,13 +16,24 @@
 package eu.omp.irap.vespa.epntapclient.votable;
+import java.io.FileWriter;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.logging.Logger;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+import eu.omp.irap.vespa.epntapclient.utils.Const;
 /**
  * @author N. Jourdane
  */
 public class Utils {
+	/** The logger for the class Utils. */
+	private static final Logger logger = Logger.getLogger(Utils.class.getName());
+
 	public static class StringJoiner {
 		String separator;
 		List<String> list;
@@ -47,4 +58,27 @@ public class Utils {
 			return string;
 		}
 	}
+
+	/**
+	 * Print the specified object in JSON format in a file on the temp directory.
+	 * 
+	 * @param title The name of the file.
+	 * @param obj the object to print in a file.
+	 * @return The path of the file.
+	 */
+	public static String printObject(String title, Object obj) {
+		Gson gson = new GsonBuilder().setPrettyPrinting().create();
+		String json = gson.toJson(obj);
+		String path = Const.TMP_DIR + "/" + title + ".json";
+		try (FileWriter writer = new FileWriter(path)) {
+			writer.write(json);
+
+		} catch (IOException e) {
+			logger.warning("Can not print in the file " + path + e);
+		}
+		logger.info("A json file representing " + title + " (" + obj.getClass().getName()
+				+ ") has been created on " + path);
+
+		return path;
+	}
 }
@@ -16,12 +16,11 @@
 package eu.omp.irap.vespa.epntapclient.votable;
+import java.util.logging.Logger;
+
 import javax.swing.JFrame;
 import javax.swing.SwingUtilities;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
 import com.google.gson.Gson;
 import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableController;
@@ -32,9 +31,8 @@ import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableController;
  * @author N. Jourdane
  */
 public class VOTableApp {
-
-	/** The logger for this class. */
-	static final Logger logger = LogManager.getLogger(VOTableApp.class);
+	/** The logger for the class VOTableApp. */
+	private static final Logger logger = Logger.getLogger(VOTableApp.class.getName());
 	/**
 	 * Main function to start the application as standalone.
@@ -28,9 +28,7 @@ import java.net.URL;
 import java.net.URLEncoder;
 import java.text.SimpleDateFormat;
 import java.util.Date;
-
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import java.util.logging.Logger;
 import eu.omp.irap.vespa.epntapclient.utils.Const;
 import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableException.BadRequestException;
@@ -42,9 +40,8 @@ import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableException.HTTPRe
  * @author N. Jourdane
  */
 public final class VOTableConnection {
-
-	/** The logger for this class. */
-	private static final Logger logger = LogManager.getLogger(VOTableConnection.class);
+	/** The logger for the class VOTableConnection. */
+	private static final Logger logger = Logger.getLogger(VOTableConnection.class.getName());
 	/** The user agent used for the requests. */
 	private static final String USER_AGENT = "Mozilla/5.0";
@@ -17,9 +17,7 @@
 package eu.omp.irap.vespa.epntapclient.votable.controller;
 import java.io.IOException;
-
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import java.util.logging.Logger;
 import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableException.VOTableParsingException;
 import eu.omp.irap.vespa.epntapclient.votable.model.Table;
@@ -30,9 +28,8 @@ import eu.omp.irap.vespa.epntapclient.votable.view.VOTableView;
  * @author N. Jourdane
  */
 public class VOTableController {
-
-	/** The logger for this class. */
-	private static final Logger logger = LogManager.getLogger(VOTableController.class);
+	/** The logger for the class VOTableController. */
+	private static final Logger logger = Logger.getLogger(VOTableController.class.getName());
 	/** The view of the VOTable */
 	VOTableView view;
@@ -22,15 +22,13 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.logging.Logger;
 import javax.xml.bind.DatatypeConverter;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
 import com.google.gson.Gson;
-import eu.omp.irap.vespa.epntapclient.utils.Log;
+import eu.omp.irap.vespa.epntapclient.votable.Utils;
 import eu.omp.irap.vespa.epntapclient.votable.model.DataType;
 import eu.omp.irap.vespa.epntapclient.votable.model.Field;
 import eu.omp.irap.vespa.epntapclient.votable.model.Stream;
@@ -41,9 +39,8 @@ import eu.omp.irap.vespa.epntapclient.votable.model.TableData;
  * @author N. Jourdane
  */
 public class VOTableDataParser {
-
-	/** The logger for this class. */
-	private static final Logger logger = LogManager.getLogger(VOTableDataParser.class);
+	/** The logger for the class VOTableDataParser. */
+	private static final Logger logger = Logger.getLogger(VOTableDataParser.class.getName());
 	/**
 	 * A list of arrays, representing data stored in the VOTable. Each element is a VOTable row,
@@ -95,8 +92,7 @@ public class VOTableDataParser {
 			parseFITSStream(table.getDATA().getFITS().getSTREAM(), fields);
 		}
-		String logPath = Log.printObject(data);
-		logger.info("A json file representing the VOTable data has been created on " + logPath);
+		String logPath = Utils.printObject("voTableData", data);
 	}
 	/**
@@ -256,7 +252,7 @@ public class VOTableDataParser {
 			} else if (dataType.equals(DataType.DOUBLE)) {
 				row[nColumn] = stream.getDouble();
 			} else {
-				logger.warn("Data type " + dataType + " is not supprted.");
+				logger.warning("Data type " + dataType + " is not supported.");
 			}
 			// logger.debug(columnsName[nColumn] + ": " + row[nColumn])
@@ -16,8 +16,7 @@
 package eu.omp.irap.vespa.epntapclient.votable.controller;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
+import java.util.logging.Logger;
 /**
  * VOTable Exception class.
@@ -26,42 +25,41 @@ import org.apache.logging.log4j.Logger;
  */
 @SuppressWarnings({ "javadoc", "serial" })
 public class VOTableException extends Exception {
-
-	/** The logger for this class. */
-	static final Logger logger = LogManager.getLogger(VOTableException.class);
+	/** The logger for the class VOTableException. */
+	private static final Logger logger = Logger.getLogger(VOTableException.class.getName());
 	/** The log message displayed when errors appends. */
 	private static final String ERROR_MSG = "-- error --\n%1s\nbecause:\n%2s\n-- end of error --\n";
 	public VOTableException() {
-		logger.error("A VOTable error occured.");
+		logger.warning("A VOTable error occured.");
 	}
 	public VOTableException(String message) {
-		logger.error(message);
+		logger.warning(message);
 	}
 	public VOTableException(String message, Exception e) {
-		logger.error(String.format(ERROR_MSG, message, e.getMessage()));
+		logger.warning(String.format(ERROR_MSG, message, e.getMessage()));
 	}
 	public VOTableException(Exception e) {
-		logger.error(e.getMessage());
+		logger.warning(e.getMessage());
 	}
 	public static class HTTPRequestException extends VOTableException {
 		public HTTPRequestException(String message) {
-			logger.error(message);
+			logger.warning(message);
 		}
 		public HTTPRequestException(String message, Exception e) {
-			logger.error(String.format(ERROR_MSG, message, e.getMessage()));
+			logger.warning(String.format(ERROR_MSG, message, e.getMessage()));
 		}
 	}
 	public static class VOTableParsingException extends VOTableException {
 		public VOTableParsingException(String message, Exception e) {
-			logger.error(String.format(ERROR_MSG, message, e.getMessage()));
+			logger.warning(String.format(ERROR_MSG, message, e.getMessage()));
 		}
 	}
@@ -71,7 +69,7 @@ public class VOTableException extends Exception {
 		public BadRequestException(String message, String info) {
 			super(message);
 			this.info = info;
-			logger.error(message + "\nDetails: " + info);
+			logger.warning(message + "\nDetails: " + info);
 		}
 		public String getInfo() {
@@ -18,6 +18,7 @@ package eu.omp.irap.vespa.epntapclient.votable.controller;
 import java.io.File;
 import java.io.IOException;
+import java.util.logging.Logger;
 import javax.xml.bind.JAXBContext;
 import javax.xml.bind.JAXBException;
@@ -31,8 +32,6 @@ import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
 import org.w3c.dom.Document;
 import org.w3c.dom.NamedNodeMap;
 import org.xml.sax.SAXException;
@@ -44,9 +43,8 @@ import eu.omp.irap.vespa.epntapclient.votable.model.VOTABLE;
  * @author N. Jourdane
  */
 public final class VOTableParser {
-
-	/** The logger for this class. */
-	static final Logger logger = LogManager.getLogger(VOTableParser.class);
+	/** The logger for the class VOTableParser. */
+	private static final Logger logger = Logger.getLogger(VOTableParser.class.getName());
 	/** The path of the VOTable to verify the VOTable XML file. */
 	private static final String VOTABLE_SHEMA = "http://www.ivoa.net/xml/VOTable/v";
@@ -18,6 +18,7 @@ package eu.omp.irap.vespa.epntapclient.votable.view;
 import java.awt.BorderLayout;
 import java.util.List;
+import java.util.logging.Logger;
 import javax.swing.JOptionPane;
 import javax.swing.JPanel;
@@ -28,18 +29,14 @@ import javax.swing.event.TableModelEvent;
 import javax.swing.event.TableModelListener;
 import javax.swing.table.DefaultTableModel;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-
 /**
  * The main class of the View of the application.
  * 
  * @author N. Jourdane
  */
 public class VOTableView extends JPanel implements TableModelListener {
-
-	/** The logger for this class. */
-	static final Logger logger = LogManager.getLogger(VOTableView.class);
+	/** The logger for the class VOTableView. */
+	private static final Logger logger = Logger.getLogger(VOTableView.class.getName());
 	// TODO: Create classes VOTableGUI and VOTableCLI which implements an interface VOTableView
 	/** The serial version UID (affected with a random number). */
@@ -110,7 +107,7 @@ public class VOTableView extends JPanel implements TableModelListener {
 	 */
 	public void displayError(String message) {
 		JOptionPane.showMessageDialog(this, message, "Error", JOptionPane.ERROR_MESSAGE);
-		logger.warn(message);
+		logger.warning(message);
 	}
 	/**
@@ -122,7 +119,7 @@ public class VOTableView extends JPanel implements TableModelListener {
 	public void displayError(String message, Exception e) {
 		String error_msg = "-- user error --\n%1s\nbecause:\n%2s\n-- end of user error --\n";
 		JOptionPane.showMessageDialog(this, message, "Error", JOptionPane.ERROR_MESSAGE);
-		logger.warn(String.format(error_msg, message, e.getMessage()));
+		logger.warning(String.format(error_msg, message, e.getMessage()));
 	}
 	@Override