@Override
  public final void preTearDown() throws Exception {
    VM vm0 = Host.getHost(0).getVM(0);
    // get tableName to pass to destroyTable
    String tableName = CacheUtils.getTableName();
    Object[] o = new Object[1];
    o[0] = tableName;
    // call the destroyTable method of the same class
    // that takes care of destroying table, closing cache, disconnecting from
    // DistributedSystem
    vm0.invoke(TxnManagerMultiThreadDUnitTest.class, "destroyTable", o);
  }
Return file as string and then modify the string accordingly **
geode-core/src/distributedTest/java/org/apache/geode/internal/jta/dunit/TxnManagerMultiThreadDUnitTest.java