subprojects/parseq-tracevis-server/src/main/java/com/linkedin/parseq/GraphvizEngine.java
private String writeGenericFailureInfo(final Exec.Result result)
      throws IOException {
    StringBuilder sb = new StringBuilder();
    sb.append("graphviz process returned: ").append(result.getStatus()).append("\n").append("stdout:\n");
    Files.lines(result.getStdout()).forEach(sb::append);
    sb.append("stderr:\n");
    Files.lines(result.getStderr()).forEach(sb::append);
    return sb.toString();
  }
private String writeGenericFailureInfo(final Exec.Result result)
      throws IOException {
    StringBuilder sb = new StringBuilder();
    sb.append("graphviz process returned: ").append(result.getStatus()).append("\n").append("stdout:\n");
    Files.lines(result.getStdout()).forEach(sb::append);
    sb.append("stderr:\n");
    Files.lines(result.getStderr()).forEach(sb::append);
    return sb.toString();
  }
Writes error info to a String.