'wait()' while holding two locks

Last modified: 03 December 2024

Reports calls to wait() methods that may occur while the current thread is holding two locks.

Since calling wait() only releases one lock on its target, waiting with two locks held can easily lead to a deadlock.

Example:

synchronized (lockA) {
  synchronized (lockB) {
    lockB.wait(); //warning
    //thread A is stuck here holding lockA
  }
}

synchronized (lockA) { //thread B can't enter the block and release thread A
  lockB.notify();
}

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

WaitWhileHoldingTwoLocks
Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Java | Threading issues

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,

Can be installed with plugin:

Java, 243.23126