log4j support introduced

ethereumj-core/pom.xml

@@ -87,21 +87,48 @@ mvn clean package -Dmaven.test.skip=true
         </dependency>
 
 
-		<!-- Consumers are expected to provide their own SLF4J adapters such as
-			logback, slf4j-log4j12, slf4j-jcl and so on see http://www.slf4j.org/faq.html -->
-		<dependency>
-			<groupId>org.slf4j</groupId>
-			<artifactId>slf4j-jdk14</artifactId>
-			<version>${slf4j.version}</version>
-			<scope>runtime</scope>
-			<optional>true</optional>
-		</dependency>
-		<dependency>
-			<groupId>org.slf4j</groupId>
-			<artifactId>slf4j-api</artifactId>
-			<version>${slf4j.version}</version>
-		</dependency>
+        <!-- remove the real commons-logging from classpath -->
+        <!-- declare as provided or exclude from spring jars -->
+        <dependency>
+            <artifactId>commons-logging</artifactId>
+            <groupId>commons-logging</groupId>
+            <version>1.0</version>
+            <scope>provided</scope>
+        </dependency>
 
+        <!-- add slf4j interfaces to classpath -->
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>1.7.7</version>
+            <scope>compile</scope>
+        </dependency>
+
+        <!-- add commons logging to slf4j bridge to classpath -->
+        <!-- acts as jcl but routes commons-logging calls to slf4j -->
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>jcl-over-slf4j</artifactId>
+            <version>1.5.6</version>
+            <scope>runtime</scope>
+        </dependency>
+
+        <!-- add log4j binding to classpath -->
+        <!-- routes slf4j calls to log4j -->
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-log4j12</artifactId>
+            <version>1.7.5</version>
+            <scope>runtime</scope>
+        </dependency>
+
+        <!-- add log4j to classpath -->
+        <!-- does the logging -->
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <version>1.2.17</version>
+        </dependency>
         <dependency>
             <groupId>com.yuvalshavit</groupId>
             <artifactId>antlr-denter</artifactId>

ethereumj-core/src/main/java/org/ethereum/gui/ToolBar.java

@@ -1,6 +1,9 @@
 package org.ethereum.gui;
 
 import org.ethereum.manager.MainData;
+import org.ethereum.util.Utils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import javax.swing.*;
 
@@ -17,6 +20,8 @@ import java.awt.event.ItemListener;
  */
 public class ToolBar extends JFrame {
 
+    Logger logger = LoggerFactory.getLogger(getClass());
+
     ConnectionConsoleWindow connectionConsoleWindow = null;
     PeersTableWindow mainFrame	= null;
     BlockChainTable blockChainWindow = null;
@@ -25,6 +30,19 @@ public class ToolBar extends JFrame {
 
 
     public ToolBar() throws HeadlessException {
+
+        logger.info("EthereumJ [v0.5.1] by Roman Mandeleil");
+        logger.info(" design by Vitaly Buterin");
+        logger.info("");
+        logger.info("java.version: " + System.getProperty("java.version"));
+        logger.info("java.home:    " + System.getProperty("java.home"));
+
+        if (Utils.JAVA_VERSION < 1.7) {
+            logger.info("EthereumJ support version 1.7 and higher of Java Runtime please update");
+            System.exit(0);
+        }
+
+
         final JPanel cp = new JPanel(new FlowLayout());
         cp.setBackground(Color.WHITE);
 

ethereumj-core/src/main/java/org/ethereum/net/peerdiscovery/PeerTaster.java

@@ -72,8 +72,6 @@ public class PeerTaster {
                 e.printStackTrace();
             }
         }
-
-        System.out.println("I am dead");
     }
 
 

ethereumj-core/src/main/java/org/ethereum/util/Utils.java

@@ -47,4 +47,14 @@ public class Utils {
     public static SecureRandom getRandom(){
         return random;
     }
+
+    public static double JAVA_VERSION = getJavaVersion();
+    static double getJavaVersion() {
+        String version = System.getProperty("java.version");
+        int pos = 0, count = 0;
+        for ( ; pos<version.length() && count < 2; pos ++) {
+            if (version.charAt(pos) == '.') count ++;
+        }
+        return Double.parseDouble (version.substring (0, pos - 1));
+    }
 }

ethereumj-core/src/main/resources/log4j.properties

@@ -0,0 +1,8 @@
+# Root logger option
+log4j.rootLogger=INFO, stdout
+
+# Direct log messages to stdout
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.stdout.Target=System.out
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+log4j.appender.stdout.layout.ConversionPattern=%d{HH:mm:ss} %c{1}:  %m%n