multithreading - Thread BLOCK issue in java -

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i have thread block issue. please me. in class, have 2 objects. 1 for synchronizing threads , other doing actual business operations.

here class

class a{    object lock = new object();    b b = new b();    public addsomething(){     synchronized(lock){        b.dothis();    }   } }

i have single instance of class 'a' , multiple threads accessing method a.addsomething(). encountering thread block issue this.

the problem in b.dothis(). if isn't well-behaved (it takes long time execute or may never finish) other threads call addsomething blocked.


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