Simpliest way to add an attribute to a jar Manifest in Maven
As of today I needed to add some manifest attributes for signed Java applet. I found it very straightforward with maven-jar-plugin. Just put required attributes to src/main/resources/META-INF/MANIFEST.MF:
Permissions: all-permissions
Then just configure maven-jar-plugin plugin:
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifestFile>src/main/resources/META-INF/MANIFEST.MF</manifestFile>
</archive>
</configuration>
</plugin>
And the result was:
Manifest-Version: 1.0
Build-Jdk: 1.7.0_51
Built-By: bart
Permissions: all-permissions
Created-By: Apache Maven 3.0.5
Archiver-Version: Plexus Archiver
Name: name/prokop/bart/fps/util/BartDate.class
SHA-256-Digest: XatHlhiWAK3ArocdOcVPCS3ftOcokJNlUeRhKPTHUKs=
In the end I just used the antrun plugin like the following, antcontrib is used to loop over the list of jars:
build-trusted.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- This is a wrapper for all the other build files. -->
<project basedir="." name="project_name">
<target name="addTrustedLibraryProperty">
<jar file="${jarFile}" update="true">
<manifest>
<attribute name="Trusted-Library" value="true" />
</manifest>
</jar>
</target>
<target name="addTrustedLibraries">
<ac:foreach target="addTrustedLibraryProperty" param="jarFile" xmlns:ac="antlib:net.sf.antcontrib">
<path>
<fileset dir="target/lib" includes="**/*.jar" />
</path>
</ac:foreach>
</target>
</project>
In the pom
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<executions>
<execution>
<id>add-trusted-library-attribute</id>
<phase>package</phase>
<configuration>
<target>
<ant antfile="${basedir}/build-trusted.xml">
<target name="addTrustedLibraries" />
</ant>
</target>
</configuration>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>ant-contrib</groupId>
<artifactId>ant-contrib</artifactId>
<version>1.0b3</version>
<exclusions>
<exclusion>
<groupId>ant</groupId>
<artifactId>ant</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.ant</groupId>
<artifactId>ant-nodeps</artifactId>
<version>1.8.1</version>
</dependency>
</dependencies>
</plugin>
You can do that with the Maven JAR Plugin during the creation of the JAR file. Add the following to your pom.xml
:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<addMavenDescriptor>false</addMavenDescriptor>
<manifestEntries>
<Trusted-Library>true</Trusted-Library>
</manifestEntries>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jarsigner-plugin</artifactId>
<version>1.2</version>
<executions>
<execution>
<id>sign</id>
<goals>
<goal>sign</goal>
</goals>
</execution>
</executions>
<configuration>
<keystore>/path/to/testkeystore</keystore>
<alias>myalias</alias>
<storepass>test123</storepass>
</configuration>
</plugin>
The main attributes as specified in the JAR File Specification are available as dedicated elements, e.g.:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<addMavenDescriptor>false</addMavenDescriptor>
<manifest>
<addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
</manifest>
<manifestEntries>
<Trusted-Library>true</Trusted-Library>
</manifestEntries>
</archive>
</configuration>
</plugin>
See the Maven Archiver Reference for further information.
To modify the manifest inside an existing jar file create a text file, e.g. mymanifest.mf
which contains the required properties:
Trusted-Library: true
You can add the attributes of this file to an existing jar by executing the following command:
jar -cfm file-to-be-modified.jar mymanifest.mf
This will modify the manifest.mf
inside the given jar.