Java Thread Dump Analyzer

It groups every thread by its state — runnable, blocked, waiting, timed-waiting — so you can see at a glance what the JVM is doing. It highlights deadlocks that jstack reports, lists the stack-top methods that the most threads are sitting in (a fast way to spot a contended lock or a slow downstream call), and flags threads that are waiting to acquire a lock. Click any state to filter the thread list.

Run jstack against the process id, for example jstack followed by the PID, and copy the output. You can also send the QUIT signal to the JVM to print a dump to its console, or trigger one from a tool like jcmd, VisualVM or your APM. Taking three dumps a few seconds apart is a classic trick: threads that sit in the same place across all three are the ones that are genuinely stuck.

No. The whole analysis runs in your browser — the dump you paste never leaves your device and is not sent to any server. That matters because thread dumps can contain internal class names, SQL and other sensitive detail. As an EU-built provider, Uptimeify keeps tools like this client-side so there's nothing to transmit or store.