TIKA + JNI problem

[Alex Turbov]

Hello list.

I've got a problem using TIKA from multithreaded C++ aplication. I
wrote a simple test wrapper class using Java and call it from C++. It
looks like this:

public class TikaWrapper {
  static final int BUFFER_SIZE = 8192;
  public TikaWrapper() {
    BasicConfigurator.configure(
        new WriterAppender(new SimpleLayout(), System.err)
      );
    Logger.getRootLogger().setLevel(Level.ERROR);
  }

  public void Process(String inFileName, String outFileName)
    throws FileNotFoundException, IOException  {
    // Open files
    InputStream in = new FileInputStream(inFileName);
    BufferedWriter out = new BufferedWriter(new FileWriter(outFileName));

    try {
      Tika tika = new Tika(); // <--- Problem is HERE
      Metadata metaData = new Metadata();
      Reader reader = tika.parse(in, metaData);

      // Read the text and write to the output file
      char[] buf = new char[BUFFER_SIZE];
      for (int size = reader.read(buf); size != -1; size = reader.read(buf)) {
        out.write(buf, 0, size);
      }
      // Finalize code required
      in.close();
      out.close();
    }
    catch (Throwable e) {
      e.printStackTrace();
    }
  }
}

I create an instance of TikaWrapper from C++ code using JNI and call
Process() method.
Also TikaWrapper class has main() method and being running as Java
application everything works fine. Moreover being called from single
thread C++ application it works also. But in multithread environment
at commented line I've got an exception:
sun.misc.ServiceConfigurationError: org.apache.tika.parser.Parser:
Provider org.apache.tika.parser.asm.ClassParser not found
        at sun.misc.Service.fail(Service.java:129)
        at sun.misc.Service.access$000(Service.java:111)
        at sun.misc.Service$LazyIterator.next(Service.java:273)
        at org.apache.tika.config.TikaConfig.<init>(TikaConfig.java:147)
        at 
org.apache.tika.config.TikaConfig.getDefaultConfig(TikaConfig.java:207)
        at org.apache.tika.Tika.<init>(Tika.java:81)
        at TikaWrapper.Process(TikaWrapper.java:75)

Unfortunately I'm newbie in Java and have no idea whats going on... :(
Also TIKA documentation doesn't contain clean explanation about
TiakConfig class and what tika config file should look like.
Any help appreciated.

//wbr, alex