java - Method returns before executing all threads even though executor.awaitTermination is used -


i have method takes number of threads work , executes run() method each thread accordingly shown below

public static map<string, integer> execute(int thread_count) {         executorservice executor = executors.newfixedthreadpool(thread_count);         file folder = new file("logfiles/");                collection<file> files = fileutils.listfiles(folder, null, true);              for(file file : files){             //for rach file in folder execute run()             system.out.println(file.getname());             executor.submit(new runner((file.getabsolutepath())));         }          executor.shutdown();         try {             executor.awaittermination(1, timeunit.days);         } catch (interruptedexception e) {             system.out.println("exception "+ e + " in countlines.execute()");         }         for(map.entry<string, integer> entry: runner.linecountmap.entryset()){             system.out.println(entry.getkey() + " : : " + entry.getvalue());         }         return runner.linecountmap;// printing after threads finish executing     }

and run method defined below:

public void run() {         try {             count = countlines(file);//get number of lines in file         } catch (ioexception e) {             system.out.println("exception "+ e + " in runner.run()");         }         //count number of lines in each file , add map         linecountmap.put(file, count);     }

as have used executor.awaittermination in execute() method above, expecting linecountmap populated filesnames key , line count values. seems linecountmap being returned before threads executed.

for following files:     logtest.2014­-07-­04.log     logtest.2014­-07-­02.log     logtest.2014­-07-­01.log     logtest.2014­-07-­03.log  expected output:  linecountmap: /logtest.2014­-07-­01.log : : 4 /logtest.2014­-07-­02.log : : 8 /logtest.2014­-07-­03.log : : 2 /logtest.2014­-07-­04.log : : 1  actual output:  linecountmap: /logtest.2014­-07-­01.log : : 4 /logtest.2014­-07-­03.log : : 2 /logtest.2014­-07-­04.log : : 0

here i missing content /logtest.2014­-07-­02.log , value /logtest.2014­-07-­04.log shown 0 when 1

changing linecountmap concurrenthashmap solved issue. oliver croisier solution discussed in comments section.


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