[Soot-list] Soot does not get line numbers of source code

[Amit]

I have some .java files that I want to do DFA on. The problem is that soot
sometime cannot get the line numbers.
Here is how I invoke soot (scala code)

      soot.G.reset();
      PackManager.v().getPack("jap").add(new Transform("jap.myTransform",
TrapBodyTransformer));
      PhaseOptions.v().setPhaseOption("tag.ln", "on");
      Options.v.set_process_dir(List(inputDir));
      Options.v.set_output_dir(outputDir);
      Options.v.set_output_format(Options.output_format_jimple);
      Options.v.set_allow_phantom_refs(true);
      Options.v.set_src_prec(Options.src_prec_java);
      Options.v.set_whole_program(false);
      Options.v.set_exclude(List("java","sun", "java.lang"));
      Options.v.set_keep_line_number(true);

Options.v.set_soot_classpath(inputDir+"c:\\lib\\mongodb\\mongo-2.7.3.jar");
      Options.v.set_prepend_classpath(true);
      Options.v.setPhaseOption("jb", "use-original-names:true");
      Options.v.set_no_bodies_for_excluded(true);
      Scene.v().loadNecessaryClasses();
      PackManager.v().runPacks();
      PackManager.v().writeOutput();

Here is how I try to read line numbers:
     import soot.{Unit => JimpleCode}
     def getLine(code:JimpleCode) =
code.getTag("SourceLnPosTag").asInstanceOf[SourceLnPosTag].startLn

However, this works in certain cases and in others it gives a null pointer
exception. Generally the problem comes when the line contains an invoke
expression calling an external jar

Would be great to see a solution.
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