import java.io.*; import java.net.*; import java.util.jar.*; boolean result = true; try { File f = new File( basedir, "target/relative-project-paths-1.0-src.jar" ); if ( !f.exists() ) { System.out.println( "jar is missing" ); return false; } JarFile jf = new JarFile( f ); JarEntry je = jf.getEntry( "pom.xml" ); if ( je == null ) { System.out.println( "pom.xml entry in jar is missing" ); return false; } } catch( IOException e ) { e.printStackTrace(); result = false; } return result;