Free tools Windows power users keep installed
One-click scans. No signup required.
Some links on this page are affiliate links: if you buy through them we may earn a commission, at no extra cost to you.
If OpenHTMLtoPDF throws a NullPointerException at PdfBoxTextRenderer.getWidth, first check whether the PDF-generating process can open every image and other external resource referenced by the HTML. In one reported case, hosted images were inaccessible to the generation process; restoring access resolved that developer’s PDF failure. That is a useful first lead, not a universal diagnosis. The method name alone does not identify the cause.
Start with the complete exception and stack trace
Capture the full exception, not just the line containing PdfBoxTextRenderer.getWidth. Include nested causes and the surrounding frames. The call path matters: the reported OpenHTMLtoPDF error occurred during text breaking and inline layout, while a separate PDFBox issue concerns TrueTypeFont.getWidth. Similar method names do not establish that these are the same defect.
Record the OpenHTMLtoPDF and PDFBox versions actually resolved when the application runs, along with the font and the text being laid out when the failure occurs. A dependency file may show intended versions, but the runtime classpath is what the process uses. If the trace or versions are incomplete, collect those details before changing code or dependencies.
| What the trace shows | What to investigate | What not to assume |
|---|---|---|
PdfBoxTextRenderer.getWidth in an OpenHTMLtoPDF layout path |
External resources the renderer must load, plus the exact input, fonts and runtime dependency versions. | That the method name proves a font bug or identifies one universal cause. |
TrueTypeFont.getWidth in a PDFBox trace |
The exact PDFBox version and font-related input; compare the trace with the version-specific PDFBox issue discussed below. | That an OpenHTMLtoPDF error at PdfBoxTextRenderer.getWidth is automatically the same PDFBox defect. |
Check external images and resources from the PDF process
Inspect the HTML and stylesheets for resources loaded from outside the document: image URLs are an obvious example, but other referenced resources can matter too. Test access from the same host and runtime environment that generates the PDF. A URL that opens in a developer’s browser may still be inaccessible to the application because of network access, authentication, protocol restrictions or local-resource rules.
- Inventory references. Review image elements and resource references in the HTML and its stylesheets. Note which are remote, protected or stored on the generation host.
- Test from the generator’s environment. Check whether the process can reach each referenced URL or file. Use the same credentials, network route and runtime conditions as the PDF job where applicable.
- Confirm the resource is actually available. Check for inaccessible URLs or files, failed requests and access requirements. Do not treat a browser preview on another machine as proof the PDF process can load the asset.
- Retry PDF creation after correcting access. In one Stack Overflow report, the developer said that after access to hosted images was added, the PDF was created successfully. This shows why resource access is worth checking early; it does not prove every similarly named exception comes from images.
If the HTML contains no external resources, or access is confirmed and the exception remains, continue to the version and font checks instead of repeatedly changing resource permissions.
Compare the error with PDFBox’s documented width issue
Apache PDFBox issue PDFBOX-2307 records a NullPointerException in TrueTypeFont.getWidth affecting PDFBox 2.0.0, with 2.0.0 listed as its fix version. That is a historical, version-specific report. It is not evidence that a current failure in a different method has the same cause.
Rank #2
Compare the fully qualified method in your trace and the resolved PDFBox version with the issue before attributing the failure to it. If your trace is instead in OpenHTMLtoPDF’s PdfBoxTextRenderer.getWidth, keep investigating that execution path, including resource access. Do not upgrade or downgrade libraries solely because both error messages contain “getWidth”; establish the actual versions and failing method first.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Check font coverage when the trace points to text encoding
A font-related check is reasonable when the trace and input point to encoding or character-width calculation. PDFBox’s documented string-width operation encodes text and accumulates character widths; its API documentation notes that unsupported characters may result in an IllegalArgumentException. Check whether the selected font supports the characters in the specific string involved.
- Identify the font used for the text at the point of failure.
- Check whether the failing string contains characters not covered by that font.
- Compare a minimal version of the input using ordinary text with one that includes the suspected characters.
- Keep the observed exception precise: an unsupported-character exception is not automatically the explanation for a
NullPointerException.
Font coverage is a targeted diagnostic, not a reason to blame fonts for every failure mentioning getWidth.
Reduce the document to a reproducible case
If resource access, the method path, dependency versions and relevant font coverage do not explain the failure, reduce the input until the smallest failing case remains. This is a debugging technique, not a procedure reported by the Stack Overflow author.
Rank #4
- Save the exact HTML and record the full stack trace and runtime versions.
- Remove unrelated content and styling while keeping the failing behavior.
- Temporarily remove external resources, then restore them selectively if that changes the result.
- Reduce the text and font choices if the trace points toward text layout or encoding.
- Keep each change isolated. If the error disappears, restore one removed element at a time to identify what reintroduces it.
A useful reproducible report includes the minimal HTML, complete exception with nested causes, OpenHTMLtoPDF and PDFBox versions, the relevant font and text, and whether the generating process can access each external resource. This evidence helps distinguish a resource failure from a version-specific PDFBox issue or a font-encoding problem.
Recommended Free Tools
Troubleshooting by symptom
| Symptom | Next check | Interpretation |
|---|---|---|
Only the short PdfBoxTextRenderer.getWidth line is available |
Collect the complete trace, nested causes and runtime library versions. | The current evidence is insufficient to identify which method path or failure pattern applies. |
| HTML includes hosted images or other external resources | Test each reference from the PDF-generating environment, including required access and network conditions. | An individual reported case was resolved after access to hosted images was restored; this is a lead to test, not a guarantee. |
Trace identifies TrueTypeFont.getWidth |
Compare the actual PDFBox version with PDFBOX-2307, which concerns PDFBox 2.0.0 and lists 2.0.0 as its fix version. | This is a different reported failure from an OpenHTMLtoPDF renderer frame. |
| Trace or error indicates text encoding or unsupported characters | Check font coverage for the exact string and compare a reduced text case. | PDFBox documents that unsupported characters may lead to IllegalArgumentException; that fact does not explain every NPE. |
| Failure persists after the first checks | Build a minimal reproducible input and include resource access details and resolved dependency versions. | A smaller case makes it easier to isolate the triggering resource, text or code path. |
Or skip the browser setup
If your actual goal is to capture a public webpage as an image or PDF—not to diagnose or repair this Java exception—ScreenshotNeo can return a screenshot or PDF from one GET request. That does not fix an OpenHTMLtoPDF pipeline or explain its stack trace. Its capture flow accepts cookie and consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups and chat widgets; each step can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed, and responses report the page verdict and billing status in headers. An MCP server provides take_screenshot, get_page_info and capture_pdf tools for AI agents.
Example using cURL (replace the URL with the page you want to capture):
Best Value
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for parameters and response details. ScreenshotNeo is free for 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots. Every feature is available on every plan. If webpage capture fits your task, sign up for the free plan.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
