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For a java project I'd like to merge all third-party jars it depends on into the main jar created by Apache Ant, which I already managed to do.

The problem is that some of these jar-files have signature-files in their META-INF-directories, so when I try to run my jar-file, I get the error message "Invalid signature file digest for Manifest main attributes". After I delete the signature-files manually the error is gone.

I tried to filter the signature files out in my ant-file with an excludes-attribute or an exclude-tag, but nothing seems to have any effect.

This is the ant-task:

<target name="jar" description="Creates the jar file"> <mkdir dir="${jar}"/> <jar destfile="${jar}/${ant.project.name}.jar" level="9" filesetmanifest="mergewithoutmain"> <zipgroupfileset dir="${lib}" includes="*.jar"/> <zipfileset dir="${class}"/> <manifest> <attribute name="Main-Class" value="${mainclass}"/> </manifest> </jar> </target>

How can I filter files from the resulting jar in this ant-task? Thanks for your help!

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39

carej is right. I've been trying to do this, merging other jars into my application jar excluding some files, and there is no way to use <zipgroupfileset> for it.

My solution is a variant of the unzip/clean-up/jar method: I first merge all the external library jars into one with <zipgroupfileset>, then merge it into mine with <zipfileset> which does allow filtering. In my case it works noticeably faster and is cleaner than unzipping the files to disk:

<jar jarfile="${dist}/lib/external-libs.jar"> <zipgroupfileset dir="lib/"> <include name="**/*.jar"/> </zipgroupfileset> </jar> <sleep seconds="1"/> <jar jarfile="${dist}/lib/historadar-${DSTAMP}.jar" manifest="Manifest.txt"> <fileset dir="${build}" includes="**/*.*"/> <zipfileset src="${dist}/lib/external-libs.jar"> <exclude name="*"/> </zipfileset> </jar>

The first <jar> puts all the jars it finds in lib/ into external-libs.jar, then I make it wait for one second to avoid getting warnings about the files having modification dates in the future, then I merge my class files from the build/ directory with the content of external-libs.jar excluding the files in its root, which in this case were README files and examples.

Then I have my own README file that lists all information needed about those libraries I include in my application, such as license, website, etc.

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11

To the best of my knowledge there's no way to filter when using <zipgroupfileset>: the include/excludes used there apply to the zips to be merged, not the content within them.

If you have a well-known set of JARs to merge you could use individual <zipset> entries for each one; this approach allows using include/exclude to filter the contents of the source archive.

An alternative approach is to simply unzip everything into a temporary location, remove/modify the unwanted bits, then zip everything back up.

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3

You can use the exclude parameter in zipfileset tag to remove content from merged external JAR files, as this:

<jar jarfile="${dist}/lib/external-libs.jar"> <zipgroupfileset dir="lib/" excludes="META-INF/**/*"> <include name="**/*.jar"/> </zipgroupfileset> </jar>

The resulting JAR file will be unsigned.

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Alberto's answer works fine but takes time to unzip&rezip the archive. I implemented a new Ant task to use built-in filtering functions, that results in much faster execution:

public class FilterZipTask extends Task { private Zip zipTask; private List<FileSet> groupfilesets = new ArrayList<FileSet>(); private String excludes; public void setExcludesInZips(String excludes) { this.excludes = excludes; } public void addZipGroupFileset(FileSet set) { groupfilesets.add(set); } public void addZip(Zip zipTask) { this.zipTask = zipTask; } @Override public void execute() throws BuildException { for (FileSet fileset : groupfilesets) { Iterator<FileResource> iterator = fileset.iterator(); while (iterator.hasNext()) { ZipFileSet zfs = new ZipFileSet(); FileResource resource = iterator.next(); zfs.setSrc(resource.getFile()); zfs.setExcludes(excludes); zipTask.addZipfileset(zfs); } } zipTask.execute(); } }

And use it in build file as follows:

<taskdef name="filterzip" classname="FilterZipTask"/> <filterzip excludesInZips="META-INF/*.*"> <zipgroupfileset dir="${deps.dir}" includes="*.jar" /> <zip destfile="${destjar}" /> </filterzip>
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Have been struggling with the same issue for a few hours, so ended up writing a new task by extending the existing one:

import java.util.HashSet; import java.util.Set; import java.util.StringTokenizer; import org.apache.tools.ant.taskdefs.Jar; import org.apache.tools.ant.types.ResourceCollection; import org.apache.tools.ant.types.ZipFileSet; public class CustomizedJarTask extends Jar { protected Set<String> filters; @Override public void add(ResourceCollection resources) { if (filters != null && resources instanceof ZipFileSet) { ZipFileSet set = ZipFileSet.class.cast(resources); for (String filter : filters) set.createExclude().setName(filter); } super.add(resources); } public void setFilters(String patterns) { StringTokenizer tokenizer = new StringTokenizer(patterns, ", ", false); while (tokenizer.hasMoreTokens()) { if (filters == null) filters = new HashSet<>(); filters.add(tokenizer.nextToken()); } } }

With the above, all I need in the build file is:

<taskdef name="customized-jar" classname="CustomizedJarTask" classpath="${basedir}/bin/" /> <customized-jar jarfile="${directory.build}/external-libs.jar" duplicate="fail" filters="META-INF/**"> <zipgroupfileset dir="${directory.libs}"> <include name="**/*.jar" /> </zipgroupfileset> </customized-jar>
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I was also facing same problem. Googled a lot and found something that worked for me. Un-jar you jar file delete . META-INF/.SF , META-INF/.DSA files. Jar it again and run it should not show the error message.

Cause of error is explained here: http://qe-cafe.blogspot.in/2010/06/invalid-signature-file-digest-for.html

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