-XX:+PrintFlagsInitial prints HotSpot flag values at the initial stage, while -XX:+PrintFlagsFinal prints values after the VM has made its startup choices. To see the flags for a real application, capture that application’s startup output or query its running process with jcmd; the result belongs to that particular JVM build and environment, not to Java universally.
What is the difference between PrintFlagsInitial and PrintFlagsFinal?
Both are HotSpot-specific -XX diagnostic options. Oracle describes -XX options as specific to the HotSpot VM; many are intended for performance tuning and diagnosis. They are not portable guarantees across every Java implementation. See Oracle’s Java launcher documentation.
-XX:+PrintFlagsInitialrequests the initial values of HotSpot flags.-XX:+PrintFlagsFinalrequests the values after VM initialization and startup selection.
Comparing the two can show that a value differs between those observation points. The difference alone does not explain why the VM chose that value, prove that a command-line option changed it, or show that the value is better for an application. The explicit initial-versus-final distinction is described in a 2010 JavaWorld/InfoWorld explanation; exact behavior and displayed output should be verified on the Java release and vendor build you are troubleshooting.
How do I see the flags my application actually uses?
Capture flags during application startup
For an application’s own startup record, Oracle’s troubleshooting guidance recommends adding -XX:PrintFlagsFinal and -showversion to that application’s JVM arguments, restarting it, and reviewing its logs. This records the VM launched by the application, which may not be the same executable or configuration you get from an interactive shell.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Use the application’s JVM-argument setting or service launch configuration, preserving its existing arguments. The exact place to add them depends on the application or service wrapper. Check the startup log for the Java version and the flag output; if either is missing, confirm the arguments reached the JVM rather than being treated as application arguments. See Oracle’s troubleshooting guidance for command-line options.
Query a running process
Oracle documents jcmd <pid> VM.flags for querying a JVM process. Replace <pid> with the process ID of the Java application. To request all flags supported by that VM, use the command’s optional -all setting: jcmd <pid> VM.flags -all. Consult the local jcmd manual for the accepted syntax and process-permission requirements for your JDK. References: Oracle’s jcmd manual and Oracle’s diagnostic-tools guide.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
How should I compare flag output?
Before interpreting a changed value, make sure the outputs describe comparable JVMs and capture points. Record these details with each output:
- JVM identity: vendor, JDK release and build, HotSpot or another implementation, and architecture. A HotSpot option or value should not be assumed to apply to a different JVM.
- Capture stage: initial listing, final startup listing, or a later query of a live process. These represent different points in the VM’s lifecycle.
- Launch context: the exact JVM arguments and, where relevant, operating system, architecture, container limits, and other resource limits. VM ergonomics and environment conditions can affect startup choices.
- Purpose: use the application’s own startup logs to understand what its launch produced; use
jcmdto inspect a process that is already running.
Do not infer a flag’s origin from its displayed value alone. A value may reflect a command-line override, a VM startup choice, or a default; compare the complete output with the exact arguments and environment.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Why a printed flag value is not a tuning recommendation
A listing tells you what a particular HotSpot VM reports, not whether changing a flag will help your workload. Oracle notes that many -XX options are advanced and that some can depend on system-specific conditions. OpenJDK’s JEP 165 also documents that invalid or out-of-range flag values can cause the JVM to terminate. Confirm an option’s meaning and availability for the target Java release, and investigate an observed problem before changing a setting.
Because accepted options, defaults, and output can vary by JDK release, vendor, platform, and implementation, verify spelling and syntax against the target JVM rather than treating a listing from another machine as a universal reference.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
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.
