NullPointerException when using CompareCmd via Im4java

gabriele favaretto — Tue, 24 Oct 2017 11:34:15 -0000

I found the following bug in line 252 of ImageCommand.java there is no check if iErrorText is null:

protected void finished(int pReturnCode) throws Exception {
    if (pReturnCode > 0) {
      CommandException ce;
      if (iErrorText.size() > 0) { // this line
    ce = new CommandException(iErrorText.get(0));

I solved it as follows:

    protected void finished(int pReturnCode) throws Exception {
        if (pReturnCode > 0) {
            CommandException ce;
            if (iErrorText != null && iErrorText.size() > 0) {
                ce = new CommandException(String.join(",", iErrorText));
            } else {
                ce = new CommandException("return code: " + pReturnCode);
            }
            ce.setErrorText(iErrorText);
            ce.setReturnCode(pReturnCode);
            throw ce;
        } else {
            removeTmpFiles();
        }
    }

You can integrate this solution into your library?

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NullPointerException when using CompareCmd via Im4java