StackOptic
Back to Search
onjava.com favicon

onjava.com

https://onjava.com· First analyzed 06 May 2026· Updated 06 May 2026
Export
onjava.com
Desktop screenshot of onjava.com
Mobile screenshot of onjava.com
Mobile

Sponsored

Hosting Provider

Google Cloud Platform
cloud.google.com

IP Address

34.169.83.167

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 The Dalles, United States

ASN

AS396982

Organization

Google Cloud (us-west1)

Server

Apache

CDN

Akamai

WAF

Akamai

Nameservers

a16-65.akam.net.a1-225.akam.net.a13-64.akam.net.a3-67.akam.net.+2 more

Performance

100

Core Web Vitals

Weight

First Contentful Paint
582 ms10%
Speed Index
757 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
858 KB
55 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPress
cms
signalCustom

Technology Stack

6 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Other

1
VWO

Web Servers

1
Apache

SEO Analysis

C61/100
18
9
2
Meta Tags7/15
Content8/12
Headings3/8
Technical20/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile4/4
Indexability3/3
O
onjava.comonjava.com

Radar – O’Reilly

Now, next, and beyond: Tracking need-to-know trends at the intersection of business and technology

Title Length16 chars

Recommended: 50-60 chars (~95px / 580px)

Description Length98 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (19/24) — critical for accessibility and SEO

11 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

5 URLs

5 sub-sitemaps

robots.txt

88 rules

Sitemap reference found

Local SEO

Local Search Readiness

13/100
Poor
4 12 1

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

D54/100
Bot Access
23/25
Machine Read.
14/25
Schema Data
9/25
Citation
8/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txtvalid
llms-full.txt
Semantic HTML
Heading Hierarchy
navheader/footer
Text ratio:3%
Words:1,401
Token eff.:Optimal
Depth:2/5

Structured Data

2 JSON-LD
Article×1.2Person×1.3VideoObjectBreadcrumbList

Citation Readiness

Opening Summary
Descriptive Headingsavg 1.9w
Canonical URL
Open Graph3/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
AI readiness recommendation preview...
Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
B
72/100
14
Passed
2
Critical
2
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
13/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
2/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
15/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
7/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 recommendations
  • •Accessibility recommendation preview...
Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
67/100
B
87 mg
CO₂e / view
857.8 KB
Page Weight
80%
Cleaner Than
New Visitor
99 mg
vs
Returning (cached)
50 mg
Annual (10K/mo)
10.4 kg
Emission Segments
Data Center
4 mg
Network
26 mg
Device
57 mg
Resource Breakdown
JavaScript
395.9 KB
Images
400.0 KB
CSS
20.1 KB
HTML
34.2 KB
Other
7.5 KB
Green Hosting Verified
Google Cloud
GWF Verified
2 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
C

Security Score

66%Fair
Interactive

HTTPS

WAF

190d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

28.04.2026

Valid Until

12.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

shop.oreilly.comakamaicovers.oreilly.comanz.oreilly.reviewapi.oreilly.comapi.oreilly.reviewconferences.oreilly.comgo.oreilly.comgo.oreilly.review+12 more

SHA-256 Fingerprint

F5:31:9B:BD:9F:B4:98:0D:C5:95:73:03:C6:26:EA:23:78:0C:5F:10...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

cache-control
🟡 23 Hours(max-age=85493)
content-encoding
📦 Gzip(gzip)
content-length
34762
content-security-policy-report-only
default-src https://www.oreilly.com/0Am0gVBZ/shX/1bD/QRRvHTS...
content-type
text/html; charset=UTF-8
date
Wed, 06 May 2026 14:48:17 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

onjava.com

Domain Age
26y 3m

Created

11.02.2000

Expires

11.02.2027

Last Updated

29.01.2026

Registrar

GoDaddy.com, LLC

DNSSEC
Not Enabled

Privacy & Compliance

CookieLaw

Cookie Consent Banner
CookieLaw
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: CookieLaw
Privacy policy page linked

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
A
80/100
Mobile Friendly1 breakpoint
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
Viewport
width=device-width, initial-scale=1

Typography & Readability

Helvetica

WCAG Partial
62/100
Readability
/30
24/30

16px · LH 1.50

Hierarchy
/20
8/20
WCAG
/25
18/25

1:1 min contrast

Performance
/25
12/25

3 fonts

Heading Font

Helvetica

Sans

Body Font

Helvetica

Sans16px

Contrast Ratio

1:1

1 issue

Reading Comfort

~39 CPL

Narrow lines
32px
h2
18px
h3
16px
p

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 1.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFontsFluid Type (rem)

Color Palette

8 unique colors
8.21:1 AAA Light
#ffffff
Background· 34.9%
#4d4f53
Other· 4.6%
#050203
Primary· 9.6%
#ab7657
Secondary· 5.2%
#e8d4b7
Accent· 4%
#cef2b6
Accent· 0.2%

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

1
OneTrustEnterprise

Cookie consent and privacy compliance tools

A/B Testing & Optimization

1
VWO (Visual Website Optimizer)Mid-Market

Experimentation and conversion optimization

3

Categories

4

Total Tools

1

Enterprise

1

Mid-Market

Assessment: Sophisticated marketing and sales technology infrastructure

Sponsored

Scripts & Styles

13 Resources

10
Scripts
3
Styles
4
Async
2
Defer

Top Script Sources

oreilly.com(3)local(3)googletagmanager.com(2)cdn.cookielaw.org(1)cdn.oreillystatic.com(1)

Website Identity

O’Reilly Radar: Articles and Podcasts

Explore the latest thought leadership, articles, and podcasts from O’Reilly Radar and Asimov’s Addendum on AI, programming, and emerging tech trends.

www.oreilly.com/radar/
26 years old
Location detected: 🇺🇸 United Statesvia ip
GoDaddy.com, LLCen-US

Social Profiles

LinkedInYouTube

Sponsored

Last analyzed: 06 May 2026 at 14:48

Historical Analysis & Change Tracking