Error unmappable character for encoding UTF8 during maven compilation

Question

I am compiling a package using maven and it says build failure with following compilation error   SpanishTest java 31  81  unmappable character for encoding UTF8  I searched online and for many people  changing source encoding from UTF-8 to ISO-8859-1 seems to work but I am still getting same compilation error  I am using 32-bit Ubuntu  Here is how that tag looks in my pom xml   lt project build sourceEncoding gt ISO-8859-1 lt  project build sourceEncoding gt    Even if I change  lt project build outputEncoding gt  tag to ISO-8859-1  I still get the error Could it be because of java version  I have both-sun java and openjdk installed on my system   Can anyone please let me know what to do   Thanks

User · Accepted Answer

Configure the maven-compiler-plugin to use the same character encoding that your source files are encoded in (e.g):

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>2.3.2</version>
    <configuration>
        <source>1.6</source>
        <target>1.6</target>
        <encoding>UTF-8</encoding>
    </configuration>
</plugin>

Many maven plugins will by default use the "project.build.sourceEncoding" property so setting this in your pom will cover most plugins.

<project>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
...

However, I prefer setting the encoding in each plugin's configuration that supports it as I like to be explicit.

When your source code is compiled by the maven-compiler-plugin your source code files are read in by the compiler plugin using whatever encoding the compiler plugin is configured with. If your source files have a different encoding than the compiler plugin is using then it is possible that some characters may not exist in both encodings.

Many people prefer to set the encoding on their source files to UTF-8 so as to avoid this problem. To do this in Eclipse you can right click on a project and select Properties->Resource->Text File Encoding and change it to UTF-8. This will encode all your source files in UTF-8. (You should also explicitly configure the maven-compiler-plugin as mentioned above to use UTF-8 encoding.) With your source files and the compiler plugin both using the same encoding you shouldn't have any more unmappable characters during compilation.

Note, You can also set the file encoding globally in eclipse through Window->Preferences->General->Workspace->Text File Encoding. You can also set the encoding per file type through Window->Preferences->General->Content Types.

User · Answer

If the above answer does not work  change the encoding to cp1252 or manually remove all occurrences of the special character  For me   special character was causing the prob which was inside a comment block     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 Cp1252 lt  encoding gt      lt  configuration gt    lt  plugin gt    PS I was using GNU Linux OS Ubuntu

User · Answer

In my case I resolved that problem using such approach     Set new environment variable  JAVA TOOL OPTIONS   -Dfile encoding UTF8 Or set MAVEN OPTS  -Dfile encoding UTF-8

User · Answer

I came across this problem just now and ended up resolving it like so  I opened up the offending  java file in Notepad   and from the Encoding menu I selected  Convert to UTF-8 without BOM   Saved  Re-ran maven  all went through ok    If the offending resource was not encoded in UTF-8 - as you have configured for your maven compiler plugin - you would see in the Encoding menu of Np   a bullet mark next to the file s current encoding  in my case I saw it was set to  Encode in ANSI     So your maven compiler plugin invoked the Java compiler with the -encoding option set to UTF-8  but the compiler encountered a ANSI-encoded source file and reported this as an error  This used to be a warning previously in Java 5 but is treated as an error in Java 6

User · Answer

I too faced a similar issue and my resolution was different  I went to the line of code mentioned and traversed to the character  For SpanishTest java 31  81   go to 31st line and 81th character including spaces   I observed an apostrophe in comment which was causing the issue  Though not a mistake  the maven compiler reports issue and in my case it was possible to remove maven s  illegal  character   lol

User · Answer

I guess the issues happens at the encode strings  I solved same issues  Please try  adding trim   at last of the encode string

User · Answer

This happens in the following scenario     When working on Windows  the IDE is more than likely configured to edit files in Cp1252  which is a Microsoft adaptation of latin-11  The developer checks in  and the Continuous Integration server  usually running on Linux  which nowadays is all utf8  picks up the file  and tries to compile as a UTF-8 file  hence the warning   Try changing the encoding to cp1252  This works  To avoid future problems of this kind  use the same encoding on all the developer machines   Good luck

User · Answer

Set incodign attribute in maven-compiler plugin work for me   The code example is the following   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 source gt 1 6 lt  source gt           lt target gt 1 6 lt  target gt           lt encoding gt UTF-8 lt  encoding gt       lt  configuration gt   lt  plugin gt

User · Answer

When i inspect the console i found that the version of maven compiler is 2 5 1 but in other side i try to build my project with maven 3 2 2 So after writting the exact version in pom xml  it works good  Here is the full tag    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 3 2 lt  version gt     lt configuration gt             lt configuration gt   lt  plugin gt

[java] Error: unmappable character for encoding UTF8 during maven compilation

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