jar file gets corrupted while building with maven

Question

while building a war file i am copying a set of jars from a location to a folder inside the war. While the files do get copied , however i think they get corrupted because the same class files of the jar when taken outside the war opens with a debugger while it does not open after taking from war file .

This is a part of my war pom.xml where i copy the jars

<execution>      <id>copy-jars</id>      <phase>process-resources</phase>      <goals>          <goal>copy-resources</goal>      </goals>      <configuration>          <outputDirectory>${basedir}/target/${project.artifactId}-${buildNumber}/somefolder</outputDirectory>           <resources>              <resource>                  <directory>SomeSourceDirectory</directory>                  <filtering>true</filtering>                  <includes>                      <include>**/**</include>                  </includes>             </resource>         </resources>      </configuration>  </execution> 

SomeSourceDirectory has some jars and some other files The result is: myWar/somefolder/a.jar but when i open the classes inside this jar in a debugger..i get error in WinZip that

Invalid compressed data to extract. Severe Error:  Compressed data is invalid 

However the same class file can be viewed when i view it in original folder i.e outside the war. So is there a mistake while copying the jars? Thanks.

Answer 1

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

Answer 2

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.