Java process waitfor timeout not working. CountDownLatch; import java.
Java process waitfor timeout not working meaning of "last time out" Ask questions, find answers and collaborate at work with Stack Overflow for Teams. waitFor设置超时; java process. Also helpful is the waitFor with timeout waitFor(5, TimeUnit. The difference being children() only returns direct descendants whereas descendants() returns all descendants. The program simply produces the following output: Error: Could not find or load main class HelloWorld. redirectErrorStream(true) . However, I was wanting to run this from a java program and was running into some errors. The thing is, I hate how I have to use a thread (and make it wait for the script to respond, as explained further) for such a job. waitFor() not "waiting" for current File chooser is opened but Exception in thread "main" com. exe) returns before the background process is finished. exec() but of no success. I am not sure why it's happening, but one of the reason maybe that it's taking more than one second to hydrate and render the child component. co. waitFor() does not block the thread. stdin, stdout, stderr) operations [. If the task is doing I/O The waitFor() method of Process class is used to wait the currently executing thread until the process executed by the Process object has been completed. TimeoutException: Timeout loading page after 2000ms of your own code in minimal lines: Code block: pageLoadTimeout is not working in Selenium - Java. class file is getting generated in the same folder, where MemoryComparison. With that said: In principle, something like this will work assuming upstream cancellation is not necessary (from a pseudocode perspective, the above has syntax errors). Class Process. Instead of this it returns false. readline() (I suppose), it will only print if a \n appears, regardless to your Thread. Java -- wait method not If a process executed by Runtime. This method may be chained to waitFor() if needed. java:395) The thread is interrupted intermittently and not always which means out by 1000 times same command run, it will timeout 10 times only. waitfor 调第三方命令 挂起 死锁; java执行shell脚本 process. My code is very in-depth Without an interrupt, the underlying Thread will continue to process the Future's task to completion, with no way of knowing that the result is no longer wanted. Find centralized, trusted content and collaborate around the technologies you use most. Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Some of the methods of ProcessHandle are present in java. For the former the connectTimeout should work, for latter it wouldn't make sense because your network client already knows is unreachable and it wouldn't make sense There isn't a 100% reliable way to do this for any old task. (Even when not necessarily terminated normally with Exit Code 0, but it terminated. Wow that was a quick response. Please refer to the Java API: Object. Process process = new ProcessBuilder("cat", "file. Ask Question Asked 11 years, 11 months ago. So I tried to find the source code for waitFor method, I came to know API Note: The process may not terminate immediately. Below is documentation of method Causes the current thread to wait, if necessary, until the subprocess represented by this Process object has terminated, or the specified waiting time elapses. waitFor() returns one on of my computers but not on my other computer. The second thread will notify when the end of the call is reached. The java application that got started used an ExecutorService that did not got shotdown correctly and left zombie threads alive which prevented process termination. wait() but it keeps on waiting. wait(Native Method) at java. SECONDS); with timeout of 5 seconds, if the process end can be reasonably certain – Ironluca Commented Sep 1, 2015 at 6:13 java 使用Process调用exe程序 及 Process. waitFor The method waitFor() returns an integer value which is the return code. I googled and found that it depends on "source code of the program that is outputting this exit code". ProcessBuilder waitFor() never returns. I have a loop which runs Processes from a vector cmds, it currently runs the first process and then the second hangs. Implementation Note: My situation is as following: I got a Java program, wich starts a perl script. playwright. My problem is that this process doesn't terminate. Note: It is working fine if Based on the information here: Testing: waitFor is not a function #8855 link The Solution that works for me is update the library to new version: This module is distributed via npm which is bundled with node and should be installed as one of your project's devDependencies: I have used a method waitFor of Process class, to execute some UNIX command. util. Remarks. Process Wait For Exit not work. Core Java libraries like ExecutorService cancel asynchronous tasks with interrupt() calls on the worker thread. From my java webapp i reach a controller on the local server @RequestMapping(value = "/client/restart", method = RequestMethod. You would have to processes the child process' stdout (and stderr) whichever language you were using. Follow answered Jul 5, Java runtime process waitfor does not appear to wait for. Thus, ping is still running after the . ] can be accessed via [. Queue; import java. I suspect the program you're running is indeed exiting immediately, causing waitFor() to return straight away. This is a slightly adjusted version of Kishore Bandi's first solution which uses separate thread to capture output. waitFor() to wait for its completion. e According to the JavaDoc of class Process some platforms have a limited buffer for the output:. Share. 0. CountDownLatch; import java. Runtime. If the process has not terminated and the timeout value is less than, or equal to, zero, then this method returns Java runtime process waitfor does not appear to wait for. This interface has two methods, children() and descendants(), which both return Stream<ProcessHandle>. java:38 This method calls the System. after calling waitFor) is very likely to break at some point, because it depends on the entire output of that application fitting into whichever buffers the OS and/or JVM naturally put there (and the totality of those filters tends to be rather small). By using start, you are askingcmd. The way it does all of that is by using a design model, a database-independent image of the schema, which can be shared in a team using GIT and compared or It was not a problem with Process. Ask Question Asked 12 years, 2 months ago. I tried with both ProcessBBuilder and Runtime. socket. lang Process waitFor. Causes the current thread to wait, if necessary, until the process represented by this Process object If a process executed by Runtime. The input is read from a file and should be piped into the mysql process, everthing seems ok but the line. DbSchema is a super-flexible database designer, which can take you from designing the DB with your team all the way to safely deploying the schema. throws IOException, InterruptedException { Process process = Runtime. If the task exceeds the specified time limit, a TimeoutException will be thrown. WaitForExit. It also helps the performance for short running sub-processes, as the caller thread will not do much more than the Process. If you get Reply from X. ] getOutputStream(), getInputStream(), and getErrorStream(). Try Teams for free Explore Teams Examples. (Note I am not familiar with how that command works :/) – This problem may be related to sub-process's input stream buffers. Can you please help on this. concurrent. waitFor invocation), the input stream of the now terminated process no longer has any data that can be read. waitFor(); does not work and the terminal shows the output and exits immediately, and I cannot see the output. does not need to wait for the completion of background threads. waitFor() documentation Interesting thing to note here. The child process is not killed if the timeout expires, so in order to cleanup properly a well-behaved application should kill the child process and finish communication However, it doesn't. I need to know a way through which I will not have to put getchar(); at the end and still see the output. waitFor() requires me to flush the I am running a Java process on unix. This, again, can have many reasons. yahoo. List of usage examples for java. Lambda expressions can be used to evaluate the result of the Process execution. The Perl script is generating a file, on which Java should continue working. Collectives™ on Stack Overflow Java runtime process waitfor does not appear to wait for. ReadToEnd and the child process writes enough text to fill the redirected stream. Also the java process doesn't work like a dos In this code snippet, the supplyAsync method executes the time-consuming task asynchronously. GET) Process p1 = java. But it shouldn't be an issue since your implicit timeout is 0 seconds. In java 8, you already have methods like isAlive and destroyForcibly So you can try something like the following dirty solution:. TimeoutError: Timeout 30000ms exceeded is thrown at page. ReadToEnd before p. It should be called after all other methods are called on the process. waitFor in ProcessBuilder does not working. i. If the process is not alive, no action is taken. ConnectException because the port at which java process attempts to write/read is invalid; The connection timeout value does not hold good for cases where no process is listening on the port at which java process is attempting to connect. Once the start() is called I'm done with execution. currentThread(). Add timeout behavior to a Nothing is working. 5以降でProcessを作成するための推奨の方法は、ProcessBuilder. . ProcessBuilder proc = The process may not terminate immediately. If there is other processing to be done before the value is used then onExit is a convenient mechanism to free the current thread and block only if and when Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company That why it is not recommended to use Thread. Why Process. The get method is used to retrieve the result with a timeout of 10 seconds. Adding executorService. But I could solve the problem using Stephan's solution above. sleep in your execution script. java:502) at java. And start in Process yours bat file. Process. The script work from command line and so does this code. l. isAlive() may return true for a brief period after destroyForcibly() is called. In your code, the resulting future is only used to wait for the completion, but not for evaluating the result. waitFor () does not always wait for the subprocess to complete. Source here. getCanonicalPath(); ProcessBuilder waitFor() method causes the current thread to wait, if necessary, until the process represented by this Process object has terminated. waitFor(timeout, unit) doesn't throw NPE if timeout is less than, or equal to zero. waitFor(UNIXProcess. I don't know if the code you put in your question is exactly what you run but you must be careful and re-create a new instance of Process for every execution of your script (i. Implementation Note: This code above presents the correct way to have your thread wait for the process to complete. If there is other processing to be done before the value is used then onExit is a convenient mechanism to free the current thread and block only if and when Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company from msdn: The code example avoids a deadlock condition by calling p. waitFor(timeout, timeUnit) does not work as expected. Process as well Reading the output of a command after it has finished (i. Hot Network Questions As a solo developer, how best to avoid underestimating the difficulty of my game due to knowledge/experience of it? I am implementing the ProcessBuilder program that calls an another java program. If you don't care what it is, use an input stream, not a reader, to save the character conversion overhead. You should clear the sub-process's input stream buffers. Look inside your script if it is forking a new process and the parent process is terminating. Using process builder in java but I want the program to wait while the process is finished. Thus I want to change the default wait time for waitFor, but I can't find a way to do it from the docs (the default wait time is one second). Try Teams for free Explore Teams. See the code example for the ExitCode property. I was looking for an more elegant way to let Java check if the file exists and continue then. Try to create bat file and insert there command to wait (using command timeout or other solution from thread Sleeping in a batch file. exe to start the batch file in the background:. exec(). Javaには、Process. ) We need to monitor waitFor() and interrupt when timeout exceeds to give process a chance to terminate normally but killing it when it hangs. waitFor public boolean waitFor(long timeout, TimeUnit unit) If the process has not terminated and the timeout value is Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog Here is effective code block and the resulted org. 1. waitFor() 死锁问题了解和解决 [转载]Java Process. UNIXProcess. Java ProcessBuilder issue. WaitForExit not working when the application is already running. SECONDS); The above implicity wait code is not working for me on Google chrome. HOME; Java; java; java. If it worked then there would be no problem – user1631171. ; Get the child processes - specific for Windows Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company For Java 9+ you can use the java. Catching this exception and retrying communication will not lose any output. g dependencies) rely on threading/ or sleep as well, it will be looking for this nonexistent interrupt flag. Thanks to all your input, I now know it certainly does not. My page loading time is more than 7 seconds but I am still not getting any timeout exception from webdriver wait. Implementation Note: In Java I want to execute a . – Thanks, silky. I found this thread, which suggests that the process waitFor() is actually waiting for is simply cmd. Hot Network Questions UTC Time, navigation. Here my suggestion is use Implicitly wait once in the program when every time your Webpage will get refreshed means use Thread. Implementation Note: The methods that create processes may not work well for special processes on certain native platforms, such as native windowing processes, daemon processes, Win16/DOS processes on Microsoft Windows, or shell scripts. Java's waitFor() method seems to hang. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Implicitly wait and Thread. isReachable(timeout) Documentation: Tries to reach this InetAddress. I'm passing it a code that goes into infinite loop. implicitlyWait(10, TimeUnit. I found this this code to be very helpful as a starting off point. openqa. wait(Object. Get the id of the main process by reflection. process B spawns daemon process C and drains its outputs, too. If the subprocess has not yet terminated, the calling thread will be blocked until the subprocess exits. selenium. Also note that if process is already terminated : waitFor() will not be blocked. Java timeout function Java runtime process waitfor does not appear to wait for. The problem is that the batch-script (or its executing shell) is killed, but does not kill its own child processes (the ping here). public abstract class Process extends Object. process never ends with processBuilder. bat"); So, the process which you launch from Java (cmd. The command is executing successfully but it is returning 2, that according to convention means abnormal termination. exec() produces output -- either to stdout or stderr-- then for it to operate robustly you need to start consuming the output before calling Process. And if you knew how to write A, you wouldn't need B. You don't have any choice about that unless you can arrange for it to be redirected to the null device. destroy() implementation on Windows. To avoid blocking the current thread, use the Exited event. java:16 Exit 12404, status 0 ProcessTest. waitFor() is complete. Collectives™ on Stack Overflow you can use Process. html で、 外部プログラム/コマンドを実行する事を行ったが、 もし、その処理が Exit 12401, status 0 ProcessTest. Your code would be polling in thread A, and then using this stuff to pass the result to thread B, which is blocked. destroy(), and also after the . The waitFor() method causes the current thread to wait until the subprocess represented by this Process object has terminated, or the specified waiting time elapses. I'm creating a process on Windows from Java. For example, here you can find the feature requests. waitFor() 为Process. Process is rather poor and is getting enriched. getRuntime(). If script finds the required web element is present in the page, script moves on. Collectives™ on Stack Overflow. waitFor(), i. Java process waitFor. public class Main { Causes the current thread to wait, if necessary, until the process represented by this Process object has terminated, or the specified waiting time elapses. process A spawns child process B and spins threads to drain B's outputs. Implementation Note: Remarks. Why are the time zones not following perfect meridian Unfortunately, using 'Commons Exec' doesn't work for me. You now have it correct in your question's description. timeouts(). waitFor()返回1; Java Process. Timeout is enough, it waits but throws in the end. You can test this behaviour running from a console <nul timeout /t 10 API Note: Using onExit is an alternative to waitFor that enables both additional concurrency and convenient access to the result of the Process. start()です。 Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Getting a timeout does not mean the underlying task has been stopped. ) calls. Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds, subject to the precision and accuracy of system timers and schedulers. The solution is to search for the string "TTL" in the result, as it only exists when you get a successful ping. If the process has not terminated and the timeout value is less than, or equal to, zero, then this method returns The methods that create processes may not work well for special processes on certain native platforms, such as native windowing processes, daemon processes, Win16/DOS processes on Microsoft Windows, or shell scripts. microsoft. class:0 ProcessTest. I am giving my console output also. Causes the current thread to wait, if necessary, until the subprocess represented by this Process object has terminated, or the specified waiting time elapses. This method instructs the Process component to wait a finite amount of time for the process to // timeout takes place if connection result is not received with in the specified timeout. Implementation Requirements: The default implementation of this method invokes destroy() and so may not forcibly terminate the process. Currently java. exec() the input and output streams of the started process are redirected. 1 API Note: Using onExit is an alternative to waitFor that enables both additional concurrency and convenient access to the result of the Process. timeout being started from this process inherits the same handles. However, this a blocking call and simply wastes thread resources. I I am trying to get all files and folders from /data/data folder in rooted android device from java. One other thing to mention, I took the easy way out (because I don't care about the output of the copy command) and redirected the output to NUL. Java runtime process waitfor does not appear to wait for. To answer the question of "pinging" a machine in network, you can use the: InetAddress. However, I am getting class not found. start() // public boolean waitFor(long timeout, TimeUnit unit) throws InterruptedException Causes the current thread to wait, if necessary, until the subprocess represented by this Process object The waitFor() method of Process class is used to wait the currently executing thread until the process executed by the Process object has been completed. e. int exitCode = proc. This method instructs the Process component to wait a finite amount of time for the process to Now, the first exec is working fine and the . waitFor(); never returns. Also from Java doc: java. Commented Mar 26, Java process. Where as Implicit/Explicit wait deals with particular webelement. waitFor() not actually waiting for. Creating a thread in a process in java. wait(long timeout): "The thread releases ownership of this monitor and waits until another thread notifies threads waiting on this object's monitor to wake up either through a call Your current execution thread will be blocked on process. exec methods create a native process and return an instance of a subclass of Process that can be used to control the process and obtain information about it. Don't get me wrong, the software works fine up to 100% of the execution and it hanged ONLY ONE TIME at about 95%, so I'm trying to find a solution for that. The class Process provides methods for performing input from the process, performing output to the process, waiting for the process . process A finds out that process B exited via process. The future is cancelled and the executorService is aknowledged of that but the thread may still be working on without caring about the termination which means that it might still wast resources you would have liked to be freed. How to determine if the process waits input from the user. The process. Teams. waitfor doesn't return? 0. waitfor doesn't return? 41. If I'm starting a process with commands like "ls", "ps" or "kill" everything works fine. waitFor()メソッドがあり、このメソッドは関連する子プロセスの終了を待ち、子プロセスの終了値を返します。 言い換えると、このメソッドは現在のスレッドを一時停止させ、子プロセスが完了するまで待機します。 Starting with Java 8, you can use the waitFor() method to add a timeout to the Runtime. driver. it will much Better :) I'm executing a command in java code using ProcessBuilder class. The method returns immediately JDK-4035671 : Process. Waitfor() the API docs say: causes the current thread to wait, if necessary, until the process represented by this Process object has terminated. waitForFileChooser. I run the executable like so: String currentDir = new File(game. Program complete exitValue throws an IllegalThreadStateException if the subprocess is not terminated and returns the exit value if its terminated. jp/dk521123/34842155. The process represented by this Process object is forcibly terminated. 53. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the However, when waitFor(long timeout, TimeUnit unit) method is used process wont exit when it gets result but wait for given timeout and gets result then exit. waitFor() method is commonly used in Java to cause the current thread to wait, if necessary, until the process represented by the Process object has Java Process waitFor (long timeout, TimeUnit unit) Causes the current thread to wait, if necessary, until the process represented by this Process object has terminated, or the In this page you can find the example usage for java. When an exit code is returned by subprocess then we do not need to destroy() it. exec("cmd /c dir"); process. 2. waitFor public boolean waitFor(long timeout, TimeUnit unit) If the process has not terminated and the timeout value is I've found that ping -n 1 hostname isn't reliable either. It's because B has started a daemon. So when your timeout elapses, you would stop waiting for the completion, whereas there still might be background threads modifying the list. @Easy2DownVoteHard2Ans There are two scenarios: 1) the remote server is up but it took longer than connectTimeout to get a connection and 2) the server is down and therefore unreachable. X: Destination host unreachable. as Sanket Gupte answered, you have to add '\n' at the end of your messages, since you read your process's input stream with . If subprocesses write anything to stdout or stderr (intentionally or not), that could cause trouble: "Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the subprocess to block, and even deadlock. But what are the meanings of other return codes? If the process does not terminate after timeout seconds, a TimeoutExpired exception will be raised. These stream buffers got increased within the parent process's memory with time and at some moment your sub-process will stop responding. exec() produces output — either to stdout or stderr — then for it to operate robustly you need to start consuming the output before calling However, j. ProcessBuilder not working. PriorityQueue; import java. I'm not a Java person, and I expected waitFor() to behave like a C/C++ system() call. WaitForExit(Int32) makes the current thread wait until the associated process terminates. waitFor(); } } For reasons beyond my understanding, this program never completes. lang . start(new Runnable() { public void main() { Hi, I tried doing the same with implicit wait as 0 and with the explicit wait time as 10. One common reason is that the process produces some output and you don't read from the appropriate streams. But it usually boils down to the fact that the executed command doesn't quit. That's why you get ConnectException before timeout expires Java Process. waitFor() method sometimes returns before the subprocess has completed. Please tell why i am not getting timeout exception? I'm having trouble running multiple Processes in Java. Hot Network Questions ping from script launched by cron WebDriver implicit wait is waiting for only 10 seconds even if I give 30 or 60 seconds, control moving to the next step before loading the page. In case #2, #5 we get java. Processオブジェクトが表すプロセスの実行については、Processオブジェクトを所有するJavaプロセスと非同期でなかったり、並行でなかったりしてもかまいません。 1. If I put getchar(); at the end of C code only then I can see the complete output. Also, it is not suggestible to mix both implicit wait and explicit wait. Viewed 1k times Java runtime process waitfor does not appear to wait for. start(); System. Calling Thread. Instead, what will happen in the background thead, is the interruption of the initiating thread if the timeout elapsed. I have tried with selenium 2. but the difference is we can use Implicitly wait for entire program but Thread. – stan. 1 Waiting for finished Java-process. A deadlock condition can result if the parent process calls p. jar' it is waiting for ever and even not getting any input from the stream. shutdown() solved the problem, and the application now terminates as expected. Causes the current thread to wait, if necessary, until the process represented by this Process object has terminated, or the specified waiting time elapses. Java ProcessBuilder process waiting for input. If the process has not terminated and the timeout value is less than, or equal to, zero, then this method returns The child process is writing to stdout, and that's being buffered waiting for your Java process to read it. interrupt(); raises the interrupt flag again. 47 and 2. X. It is a bug in Java's Process. in. Kills the process forcibly. In case if element is found in the 6th second, then it will proceed Java-like dirty solution. It got timed out exactly on the 10th second. waitFor command not waiting. I'm trying to start a process externally with Java and can't read anything from its InputStream. I could use the ProcessBuilder to create a Process and then do Process. If the process has not terminated and the timeout value is less than, or equal to, zero, then this method returns Process. It has nothing to do with two threads waiting for something at the same time. With an interrupt, the underlying Thread can at least see (if it checks) that it has been interrupted, allowing it to gracefully conclude processing and exit. I noticed Ask questions, find answers and collaborate at work with Stack Overflow for Teams. exec() process. Process hangs waitFor() method. , after the Process. waitFor() If you want to fire an event without stopping your current thread, start a thread that launches the process, calls waitFor(), and then fires the event when the time is right. Forcible process destruction is defined as the immediate termination of a process, whereas normal termination allows the process to shut down cleanly. Remove the start command to run the batch file in the foreground - then, waitFor() will As for Process. java:8 Exit 12403, status 0 ProcessTest. The doc for sleep has this note . WaitForExit before p. Your understanding isn't wrong. The main process waits until the external process is done, and then spawnes the next external process. waitFor() method. Could this be happening in a very large # of threads? Or perhaps some of them are not actually completing (ie, it is hanging at waitFor in some cases)? Otherwise, I think you will be stuck with increasing the open files limit. implicitlyWait(30, TimeUnit. Using ExecutorService. waitFor() and Readline hangs. It has terminated. – はじめに http://blogs. Hot Network Questions Merge two waitFor() does exactly what you expect. This method returns immediately if the subprocess has already terminated. exec("cmd /c start " + path + "\\RunFromCode. It is saying that if some other thread calls interrupt() on the thread that is executing the code you posted before or during its call of waitFor(), an InterruptedException will be thrown. sleep Both are used for synchronization only. getByName(host). start() and Runtime. Process. the command actually gives an exit code of 0, thus giving you a lot of false positives. It may be starting one or more child processes If so the origional program will continue to operate independently of the spawned process and therefore waitFor() will only work on the new process and not the parent. waitFor() not working as expected. setSoTimeout(timeout); The cancellation will not impact prior stages. waitFor(). Every time I run this code, I go to output and verify whether the java code has Java runtime process waitfor does not appear to wait for. * Process; waitFor I am trying to run mysql to execute some files from java. If it does not find the mentioned web element, if finds that element in the web page for that particular wait period. process. waitFor() until process is terminated (i. Improve this answer. In the posted code, once the process has terminated (i. execution finished). If other parts of your program (e. When you don't read it, the buffer eventually fills up and the child process blocks writing to stdout waiting for buffer space. Implementation Note: API Note: The process may not terminate immediately. 1) The Process. However, it's stuck on reading the input streams of process B. connect(new InetSocketAddress(host, port), timeout); // This stops the request for waiting for response after connection succeeds. Now I understand that Process. waitFor() but a problem with process termination. So, for example, if the task contains some sort of loop, you should be checking its interrupt status on each iteration. So whenever your output exceeds more than a few lines of text, this My program works fine for commands like 'dir', but doesnt work for 'java -jar'. Process is hanging in java, waitFor() takes forever even though I've read (Input/Error)Stream. The task has to be written with this ability in mind. exitValue & Process. It has been simplified, uses no external libraries and have more robust termination code. There is no waitFor the threaded stream, as well. sleep will works for that single code only. Unanswered parts: When you call Runtime. from waitFor (long timeout, TimeUnit unit) docs (emphasis mine):. The 'workaround' is to consume the process's output. There are many reasons that waitFor() doesn't return. 13 Runtime. The signature of waitFor() method is: waitFor(long timeout, TimeUnit unit Examples. waitFor() blocks the current thread until the process has terminated, at which point the execution control returns to the thread that spawned the process. - Learn basics of Java Process waitFor() Method I'm not sure you understand what the Javadoc means. sleep(. sleep() raises the interrupt flag. waitFor(); batchFile is the full path of the batch file. Thread. p. exe, which returns before the actual process does. This doens't solve the problem - it only shows how to communicate between A and B, not how to write A. WaitFor will block the calling thread until the subprocess is terminated and returns immediately if it has already been terminated. I given 5 seconds as maximum time in webdriver wait. 1 It seems unlikely that the process would actually complete without closing the files. import java. When I give 'java -jar C:\mypath\filename. It would make better sense to do this via an event handler and reactive programming. But the process never throws interruptedException. waitFor() doesn't wait until process is done That thread recommends using the /wait command, but when I do it makes no difference. The try turns off the interrupt flag. waitFor() not "waiting" for current thread to finish. StandardOutput. How can I cause my Java program to wait until the process is finished? No that isnt the solution i have mentioned above that waitfor() does not work in the comments. The value 0 indicates normal termination. I tried to use pb. If the process has not terminated and the timeout value is less than, or equal to, zero, then this method returns Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I think the problem here is that you don't wait enough for ffmpeg process to finish and after only 200 milliseconds you go on trying to read the converted file without checking whether ffmpeg process exited correctly. This method first tries to use ICMP (ICMP ECHO REQUEST), falling back to a TCP connection on port 7 (Echo) of the remote host. if it is still to early, the issue is elsewhere (not in the java code), possibly it is the command you are using to lock the screen. exe file. Java process waitFor() function causes application to freeze. NB at present not consuming the output is taking 100% of the execution time I have a process which should reboot a client from a server. The method returns immediately when the subprocess has been terminated and if the subprocess is not terminated, the thread will be blocked. I want to check how it works. java is. All its standard I/O (i. Because the command has a pipe, you also need to use cmd /C. – A quick and practical guide to Java Process API. exec("cmd /c start /b /wait " + batchFile); int returnVal = p1. net. The problem is that timeout tries to get access to the console, something it can not do because of the redirection. txt") . As by now, i had set a. waitfor导致的 If I read the link above correctly, thread. You yourself saying that its an infinite loop. I have command that works correctly in windows cmd: adb -s <device name> shell su -c ls /data/data/ I try to execute this command in java, everything seems ok but the line . Modified 11 years, 7 months ago. Java Process. CompletableFuture cancellation will not java. If the process has already terminated then this method returns immediately with the value true. txt is getting created. method returns the control but the process keeps running in the background - because you have specified a timeout limit and by that time, your C program has not finished. Object. ExecutorService; import java. The ProcessBuilder. lnk shortcut which it self executes a . Waiting for finished Java-process. Hot Network Questions Java runtime process waitfor does not appear to wait for. println("Output: " + waitForOuput(process, Java runtime process waitfor does not appear to wait for. lang. But when I am running the above two lines from the command prompt, everything is working fine and the output1. If the subprocess has already terminated then this method returns immediately with the value true. Process p = Runtime. Most likely, your psql process is blocked because it's waiting for something to read its output, and you don't start to do that until Process. I need to run an external process which is spawned by the main process using ProcessBuilder. According to the comments above, one solution is to remove the piece of code between the process start and the process wait process (waitFor() p = pb. waitFor() 阻塞卡住不返回; 调用Process. 0 waitFor command not waiting process. out. I can start the process and get information either on the InputStream or It looks like your script score. read() method to prevent the program from terminating before all the processes have exited (and have run the method specified by the When a thread actually awakens after a time out expires or sleep wakes up is not exact. sleep(3000); to let Java wait for the file to be finished. Implementation Note: Hi, I am trying to use webdriver in selenium test. Source Link. Causes the current thread to wait, if necessary, until the process I don't wait for the subprocess to complete (I am using processbuilder, and do not call waitfor). I don't think it really matters though since in my code I get a user and password and use those to authenticate, and I never even get to that step since the code is throwing an exception at the connect() step in both implementations (using sshtools/j2ssh and jsch), which occurs before the authentication step (see the update of my The problem I am facing is that P. So is it possible to change the default wait time? I've been trying to write a java program that uses the Tesseract only requires the name of the output file it does not require the extension. ProcessHandle interface. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the API Note: The process may not terminate immediately. manage(). If you read the question, you see he is waiting on an external process. Executors; /** Testing CountDownLatch and ExecutorService to manage scenario where * multiple Threads work together to complete tasks from a single * resource No, you can send the request just once in a separated thread, then on the main thread wait for 15 seconds on a lock. sleep at that time. Working from the command prompt this works perfect. The ExecutorService class provides a higher-level abstraction for managing Example usage for java. InterruptedException at java. So i would say that they will both behave the same when the subprocess is already terminated but Remarks. 3. getGamePath()). sh is assigning the important work of updating/populating the output file to a sub-process and it is terminating by itself. Explore Teams. Runtime. I have got it working till here. But it seems the second exec is not working as no output1. The whole issue (I think) is that the subprocesses are still running, and may not terminate for a little while, but I want the timeout call to API Note: The process may not terminate immediately. My API Note: The process may not terminate immediately. process B finishes, daemon process still lives. Load 7 more related questions Show fewer related questions Sorted by: Reset Causes the current thread to wait, if necessary, until the subprocess represented by this Process object has terminated, or the specified waiting time elapses. I run Tomcat as root. API Note: The process may not terminate immediately. But somehow the VM still waits for the ping to finish before finishing itself. hao ktf urwe gbvnvyr qdxji kfhqhv tulbwa jms asvbi iqtqzt