IllegalMonitorStateException on wait() call

java, multithreading, wait

Solution

You need to be in a `synchronized` block of the object you want to wait on in order for `Object.wait()` to work.

Also, I recommend looking at the concurrency packages instead of the old school threading packages. They are safer and way easier to work with.

I assumed you meant `Object.wait()` as your exception is what happens when you try to gain access without holding the objects lock.

Problem

I am using multi-threading in java for my program. I have run thread successfully but when I am using `Thread.wait()`, it is throwing `java.lang.IllegalMonitorStateException`. How can I make a thread wait until it will be notified?

Original source