unmappable character for encoding warning in Java

Question

I m currently working on a Java project that is emitting the following warning when I compile    src com myco apps AppDBCore java 439  warning  unmappable character for encoding UTF8      javac          String copyright      2003-2008 My Company  All rights reserved      I m not sure how SO will render the character before the date  but it should be a copyright symbol  and is displayed in the warning as a question mark in a diamond   It s worth noting that the character appears in the output artifact correctly  but the warnings are a nuisance and the file containing this class may one day be touched by a text editor that saves the encoding incorrectly     How can I inject this character into the  copyright  string so that the compiler is happy  and the symbol is preserved in the file without potential re-encoding issues

User · Accepted Answer

User · Answer

put this line in yor file  gradle  above the Java conf   apply plugin   java  compileJava  options encoding    UTF-8

User · Answer

This worked for me -        lt  xml version  1 0  encoding  utf-8    gt   lt project name  test  default  compile  gt       lt target name  compile  gt           lt javac srcdir  src  destdir  classes                              encoding  iso-8859-1  debug  true    gt       lt  target gt   lt  project gt

User · Answer

put this line in yor file  gradle  above the Java conf   apply plugin   java  compileJava  options encoding    UTF-8

User · Answer

Try with  javac -encoding ISO-8859-1 file name java

User · Answer

I had the same problem  where the character index reported in the java error message was incorrect  I narrowed it down to the double quote characters just prior to the reported position being hex 094  cancel instead of quote  but represented as a quote  instead of hex 022   As soon as I swapped for the hex 022 variant all was fine

User · Answer

Gradle Steps  If you are using Gradle then you can find the line that applies the java plugin   apply plugin   java    Then set the encoding for the compile task to be UTF-8   compileJava  options encoding    UTF-8        If you have unit tests  then you probably want to compile those with UTF-8 too   compileTestJava  options encoding    UTF-8     Overall Gradle Example  This means that the overall gradle code would look something like this   apply plugin   java  compileJava  options encoding    UTF-8   compileTestJava  options encoding    UTF-8

User · Answer

For those wondering why this happens on some systems and not on others  with the same source  build parameters  and so on   check your LANG environment variable  I get the warning error when LANG C UTF-8  but not when LANG en US UTF-8

User · Answer

Most of the time this compile error comes when unicode UTF-8 encoded  file compiling   javac -encoding UTF-8 HelloWorld java   and also You can add this compile option to your IDE  ex   Intellij idea  File settings Java Compiler  add as additional command line parameter       -encoding   encoding   Set the source file encoding name  such as EUC-JP and UTF-8   If -encoding is not specified  the platform default converter is used   DOC

User · Answer

I had the same problem  where the character index reported in the java error message was incorrect  I narrowed it down to the double quote characters just prior to the reported position being hex 094  cancel instead of quote  but represented as a quote  instead of hex 022   As soon as I swapped for the hex 022 variant all was fine

User · Answer

This worked for me -        lt  xml version  1 0  encoding  utf-8    gt   lt project name  test  default  compile  gt       lt target name  compile  gt           lt javac srcdir  src  destdir  classes                              encoding  iso-8859-1  debug  true    gt       lt  target gt   lt  project gt

User · Answer

If one is using Maven Build from the command prompt one can use the following command as well                       mvn -Dproject build sourceEncoding UTF-8

User · Answer

For those wondering why this happens on some systems and not on others  with the same source  build parameters  and so on   check your LANG environment variable  I get the warning error when LANG C UTF-8  but not when LANG en US UTF-8

User · Answer

If you use eclipse  Eclipse can put utf8 code for you even you write utf8 character  You will see normal utf8 character when you programming but background will be utf8 code      Select Project Right click and select Properties Select Resource on Resource Panel Top of right menu which opened after 2   You can see in Resource Panel  Text File Encoding  select other which you want   P S   this will ok if you static value in code  For Example String test    IIIIIiiiiii

User · Answer

Try with  javac -encoding ISO-8859-1 file name java

User · Answer

This helped for me       All you need to do  is to specify a envirnoment variable called   JAVA TOOL OPTIONS  If you set this variable to -Dfile encoding UTF8    everytime a JVM is started  it will pick up this information    Source  http   whatiscomingtomyhead wordpress com 2012 01 02 get-rid-of-unmappable-character-for-encoding-cp1252-once-and-for-all

User · Answer

This helped for me       All you need to do  is to specify a envirnoment variable called   JAVA TOOL OPTIONS  If you set this variable to -Dfile encoding UTF8    everytime a JVM is started  it will pick up this information    Source  http   whatiscomingtomyhead wordpress com 2012 01 02 get-rid-of-unmappable-character-for-encoding-cp1252-once-and-for-all

User · Answer

Gradle Steps  If you are using Gradle then you can find the line that applies the java plugin   apply plugin   java    Then set the encoding for the compile task to be UTF-8   compileJava  options encoding    UTF-8        If you have unit tests  then you probably want to compile those with UTF-8 too   compileTestJava  options encoding    UTF-8     Overall Gradle Example  This means that the overall gradle code would look something like this   apply plugin   java  compileJava  options encoding    UTF-8   compileTestJava  options encoding    UTF-8

User · Answer

If you use eclipse  Eclipse can put utf8 code for you even you write utf8 character  You will see normal utf8 character when you programming but background will be utf8 code      Select Project Right click and select Properties Select Resource on Resource Panel Top of right menu which opened after 2   You can see in Resource Panel  Text File Encoding  select other which you want   P S   this will ok if you static value in code  For Example String test    IIIIIiiiiii

User · Answer

If you re using Maven  set the  lt encoding gt  explicitly in the compiler plugin s configuration  e g    lt build gt       lt plugins gt           lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-compiler-plugin lt  artifactId gt               lt version gt 2 3 2 lt  version gt               lt configuration gt                   lt encoding gt UTF-8 lt  encoding gt               lt  configuration gt           lt  plugin gt

User · Answer

Most of the time this compile error comes when unicode UTF-8 encoded  file compiling   javac -encoding UTF-8 HelloWorld java   and also You can add this compile option to your IDE  ex   Intellij idea  File settings Java Compiler  add as additional command line parameter       -encoding   encoding   Set the source file encoding name  such as EUC-JP and UTF-8   If -encoding is not specified  the platform default converter is used   DOC

User · Answer

If one is using Maven Build from the command prompt one can use the following command as well                       mvn -Dproject build sourceEncoding UTF-8

User · Answer

If you re using Maven  set the  lt encoding gt  explicitly in the compiler plugin s configuration  e g    lt build gt       lt plugins gt           lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-compiler-plugin lt  artifactId gt               lt version gt 2 3 2 lt  version gt               lt configuration gt                   lt encoding gt UTF-8 lt  encoding gt               lt  configuration gt           lt  plugin gt

[java] "unmappable character for encoding" warning in Java

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