Log4j utf8 encoding

Question

I am using Java and Log4j ..

I want to write a string with German special characters, for example, for example, Ü ä, etc. But in my LogFile it looks like this:

<E4><FC><F6> 

log4j.properties

 log4j.rootLogger = ALL, rollingFile log4j.appender.rollingFile=org.apache.log4j.RollingFileAppender log4j.appender.rollingFile.File=/home/tomcat/logs/debug.log log4j.appender.rollingFile.MaxFileSize=10MB log4j.appender.rollingFile.MaxBackupIndex=2 log4j.appender.rollingFile.layout = org.apache.log4j.PatternLayout log4j.appender.rollingFile.layout.ConversionPattern=%d %p %c - %m%n log4j.appender.rollingFile.encoding=UTF-8 

Answer 1

You should try the code below to store and retrieve Unicode values

 import java.io.UnsupportedEncodingException; public class Test { public static void printBytes(byte[] array, String name) { for (int k = 0; k < array.length; k++) { System.out.println(name + "[" + k + "] = " + "0x" + UnicodeFormatter.byteToHex(array[k])); } } public static void main(String[] args) { System.out.println(System.getProperty("file.encoding")); String original = new String("A" + "\u00ea" + "\u00f1" + "\u00fc" + "C"); System.out.println("original = " + original); System.out.println(); try { byte[] utf8Bytes = original.getBytes("UTF8"); byte[] defaultBytes = original.getBytes(); String roundTrip = new String(utf8Bytes, "UTF8"); System.out.println("roundTrip = " + roundTrip); System.out.println(); printBytes(utf8Bytes, "utf8Bytes"); System.out.println(); printBytes(defaultBytes, "defaultBytes"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } // main } class UnicodeFormatter { static public String byteToHex(byte b) { // Returns hex String representation of byte b char hexDigit[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; char[] array = { hexDigit[(b >> 4) & 0x0f], hexDigit[b & 0x0f] }; return new String(array); } static public String charToHex(char c) { // Returns hex String representation of char c byte hi = (byte) (c >>> 8); byte lo = (byte) (c & 0xff); return byteToHex(hi) + byteToHex(lo); } } 

Output

 Cp1252 original = AêñüC roundTrip = AêñüC utf8Bytes[0] = 0x41 utf8Bytes[1] = 0xc3 utf8Bytes[2] = 0xaa utf8Bytes[3] = 0xc3 utf8Bytes[4] = 0xb1 utf8Bytes[5] = 0xc3 utf8Bytes[6] = 0xbc utf8Bytes[7] = 0x43 defaultBytes[0] = 0x41 defaultBytes[1] = 0xea defaultBytes[2] = 0xf1 defaultBytes[3] = 0xfc defaultBytes[4] = 0x43 

Answer 2

According to the most common problems related to encoding with Log4J, it seems that there are no known problems, so I assume that you use the wrong encoding when opening the file, try checking the maby editor and system encoding, you will find the problem there.