jar file gets corrupted while building with maven

Also, you can continue benefit to use maven filtering without corrupting jars inside.

We choose to exclude jar from filtered extensions.

In th pluginManagement section of the parent pom we put this configuration

 <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <version>2.5</version>
    <configuration>
      <encoding>${project.build.sourceEncoding}</encoding>
      <nonFilteredFileExtensions>
        <nonFilteredFileExtension>jar</nonFilteredFileExtension>
        <nonFilteredFileExtension>pdf</nonFilteredFileExtension>
        <nonFilteredFileExtension>swf</nonFilteredFileExtension>
        <nonFilteredFileExtension>zip</nonFilteredFileExtension>
        <nonFilteredFileExtension>bz2</nonFilteredFileExtension>
        <nonFilteredFileExtension>gz</nonFilteredFileExtension>
        <nonFilteredFileExtension>acp</nonFilteredFileExtension>
        <nonFilteredFileExtension>bin</nonFilteredFileExtension>
        <nonFilteredFileExtension>odt</nonFilteredFileExtension>
        <nonFilteredFileExtension>doc</nonFilteredFileExtension>
        <nonFilteredFileExtension>xls</nonFilteredFileExtension>
      </nonFilteredFileExtensions>
    </configuration>
  </plugin>

Note we added jar extensions as well as default maven excluded filetypes (its a zip after all).

Besides avoiding corruption of the archive it also speeds up the process as it does not have to filter large files.

Remove <filtering>true</filtering>, it corrupts the jar files.

Try Maven Assembly Plugin. It's my favourite plugin to add custom resources to a *.war file. See also Pre-defined Descriptor Files.

I had a similar error when I've added

<copy ...>
<fileset ... />
<filterchain>
    <tokenfilter>
         <replacestring from="..." to="..." />
    </tokenfilter>
</filterchain>
</copy>

to my copy task in ANT. It corrupted the jar files when copying them. I've solved this by applying the filter ONLY on the targeted text files and not on jar files.