Waitfor java process timeout waitFor(); Integer result = process. l. waitForOrKill(long numberOfMillis) you could use to simulate a timeout of a process. I've utility method for verifying whether a process is still running, given the process name (using Process. When request is received using async sockets message should be sent. The ExecutorService provides you with an API to execute a set of tasks within a given timeout. g dependencies) rely on threading/ or sleep as well, it will be looking for this nonexistent interrupt flag. printStackTrace(); } } In this case how can I distinguish between a spurious wake up and time out? If it is a spurious wake up, i need to go back and wait. Or maybe reentrant locks, or other locking options (see packages java. ofSeconds(30); ExecutorService executor = Executors. Look inside your script if it is forking a new process and the parent process is terminating. g. waitFor() documentation （1）Java. e. The method returns immediately Wait for the process to complete. ] getOutputStream(), getInputStream(), and getErrorStream(). To try this scenario I wrote below 通过Java方法去调用shell脚本并执行，该方法会先后调用两个脚本，出现问题的是调用第二个脚本的时候，出现了该问题 目录 * 问题 1. waitFor(timeout, unit) says: "Throws: NullPointerException - if unit is null". Improve this answer. Voting experiment to encourage people who rarely vote to upvote. 1. waitFor invocation), the input stream of the now terminated process no longer has any data that can be read. Remove the start command to run the batch file in the foreground - then, waitFor() will If I read the link above correctly, thread. The Java Process waitFor() method causes the current thread to wait, if necessary, until the process represented by this Process object has terminated. TimeUnit). bsdWaitForImpl(Unknown Source) at java. waitFor() method causes the current thread to wait, if necessary, until the process represented by this Process object has terminated. Miss Chanandler Java runtime process waitfor does not appear to wait for. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the 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 Process. */ 在编写Java程序时，有时候我们需要调用外部的exe，这时可以通过Runtime的exec()方法，该命令使用比较简单，但是无法对执行做细节的控制。通过使用ProcessBuilder构建Process可以进行细节的控制，但是默认process是阻塞的。不要被误解，他也是阻塞的，阻塞到process进程执行完，才进行是否超时的判断。 I've found that ping -n 1 hostname isn't reliable either. waitFor() and uncomment the commented section, then for non terminating processes, the main thread also won't stop. The call to Process. waitFor() メソッド は java. lang Process waitFor. waitFor(); With Java 8, it's also possible to use waitFor(long timeout, TimeUnit unit) which returns a boolean. $ scala-cli --native --native-version 0. MINUTES)) {throw new OpenShiftException 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 Process. osWaitForImpl(Unknown Source) at According to this eclipse bug post, TIMEOUT in Windows batch has some sort of limitation and cannot be used in "background scripts". API. int exitCode = proc. sendError() or more usually PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(response. 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 Thanks, silky. getOutputStream(). System class 1. I looked up the waitFor() method in the documentation and it says: Causes the current thread to wait, if necessary, until the process represented by this Process object has terminated. @cletus - then you don't use a CountDownLatch :-) Mind you, I'm not arguing that this approach is better than yours. Process and its handling of stdin, stdout and stderr. * Process; waitFor; Introduction In this page you can find the example usage for java. 在编写Java程序时，有时候我们需要调用外部的exe，这时可以通过Runtime的exec()方法，该命令使用比较简单，但是无法对执行做细节的控制。通过使用ProcessBuilder构建Process可以进行细节的控制，但是默认process是阻塞的。不要被误解，他也是阻塞的，阻塞到process进程执行完，才进行是否超时的判断。 Your question is unclear. Core Java libraries like ExecutorService cancel asynchronous tasks with interrupt() calls on the worker thread. List of usage examples for java. IOUtils. waitFor() method sometimes returns before the subprocess has completed. Process. waitFor() and there is another thread which keeps track of the timeout. Java native process timeout. – Lii. I noticed this when I would sometimes get an exit status of 0 when it should have been 1. Save the output result of a Java program into a file. Related. sleep will works for that single code only. CountDownLatch; import java. X: Destination host unreachable. if another thread has not notified it within the timeout period). hits timeout) get exit code of process; powershell; wait; The Wait-Process waits correctly for 400s in your solution, but the "# terminate the process" clause never hits after timeout - so also, the process is never killed, and after next 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 Is there a way (either builtin, or with external library) to have a time limit for Process. sh is assigning the important work of updating/populating the output file to a sub-process and it is terminating by itself. Date; import com. However, j. We have a class in our project that is an extension to org. If waiting for all tasks in the ExecutorService to finish isn't precisely your goal, but rather waiting until a specific batch of tasks has completed, you can use a CompletionService — specifically, an ExecutorCompletionService. scala Exception in thread "main"java. startおよびRuntime. 3 I3944_Reproducer. static CompletableFuture<String> readOutStream(InputStream is Java process waitFor. atomic, java. If I invoke it In Java I want to execute a . getOutputStream(), That would create another process that sleeps for the timeout and kills the process if it hasn't completed so far. Runtime. nanoTime() instead. e. I run the executable like so: String currentDir = new File(game. Under Linux RedHat 7. waitFor(timeout, timeUnit) does not work as expected. The first one meassures absolute time (based on system clock) and might have curious results if the system time is changed. The task is: application will receive HTTP request and should provide response. lang . java 8. If it doesn't work then either: there's a bug in the JVM or the OS (highly unlikely for something like this), or . 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 Name: mc57594 Date: 02/28/97 1) The Process. 8) Share. exit(1) . 先ずJava API DocsからProcessクラスを一緒に見ましょう. The input is read from a file and should be piped into the mysql process, everthing seems ok but the line. Instead of this it returns false. exitValue()=0 its ok, if it's -1 something is wrong, but if it's something else, what does it mean? For instance i am taking 6. Now, you don't know exactly which process has finished. It was not a problem with Process. I would like to use the Process. The default implementation of this methods polls the exitValue to check if the process has terminated. The process did not complete within 60 seconds. 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 入出力. Select a discussion category from the picklist. Of course, I don't want to wait forever in case the application processing these messages is down - there needs to be a timeout. I've now run into this problem with Java API. (!process. Finally, if I attempt to move the commented section to where process. Commented Sep 1, 2015 at 6:13. 5. This method first tries to use ICMP (ICMP ECHO REQUEST), falling back to a TCP connection on port 7 (Echo) of the remote host. 返回错误 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. java Runtime process - check if waiting for input. This means that something in the Java application is interfering with the spawned Process, but I have absolutely no idea There isn't a 100% reliable way to do this for any old task. waitFor() call so the execution thread can finish. The try turns off the interrupt flag. This might be a better choice to refrain from a case where the waitFor never returns. If your application is single-threaded (hence the condition() method is running in the same thread), then your only option is to cut the sleep period from 1000ms to 1ms, and poll the condition() method after every 1ms. killProcess(String pid) => shuld kill the process To answer the question of "pinging" a machine in network, you can use the: InetAddress. in your gist you're using the CommandResult to expose exceptions, except that we're talking about bugs (e. So, for example, if the task contains some sort of loop, you should be checking its interrupt status on each iteration. 0 According to the JavaDoc of class Process some platforms have a limited buffer for the output:. - Learn basics of Java Process waitFor() Method Name: vi73552 Date: 06/08/99 Hi, RFE: Needs getPid(), getEnvVar(), killProcess(String pid) From the java. LinkedList; import java. Enter a title that clearly identifies the subject of your question. commons. exe) 2. waitFor() should work. How do I stop a Process? public void terminalExecute(String builder) throws InterruptedException { System. waitFor(WAIT_FOR_EXIT_TIMEOUT, TimeUnit. exec(command); process. 0 java. waitFor(long timeout, TimeUnit unit) m Add timeout behavior to a class using an old framework. shared. sleep Both are used for synchronization only. All its standard I/O (i. To your points: The function will throw exceptions as they happen, nothing gets lost; exception handling is only necessary for (1) safe resource handling (and resources are handled) or (2) exposing an Either data-type; . exec(commandLine); /* Set up process I/O. 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 What you are looking for can be found here. Java documentation for java. timeout of 10s with retry delay of 3s. It depends on your code, your use case and on the Java This question is about java. p. Waitfor() the API docs say: causes the current thread to wait, if necessary, until the process represented by this Process object has terminated. getCanonicalPath(); ProcessBuilder Heed the warnings of the Process javadoc: failure to promptly write the input stream or read the output stream of the process may cause the process to block, or even deadlock. @HarryJohnston I never worked with Named Pipes before, so I'm not too sure. waitFor(15, ) will never be reached. Hibernate cannot do this in unified way. getRuntime(); Process process = runtime. The returnValue will be the exit code of the child process. Because the command has a pipe, you also need to use cmd /C. getEnvVar() => shuld able to return either Windows/Unix Environment Variable [for this, please see bug 4199068] 3. Normally you wait with a timeout using Process#waitFor. , after the Process. For example, import java. Groovy provides a method call Process. Basically the result is that, to the user, the program APPEARS to have crashed, but killing the Java process that drives the ProcessBuilder. g. If the task is doing I/O The process. waitFor returns but the streams aren't terminated. right? And when it is interrupted due to timeout then waitFor() throws an exception and destroy() is not executed, but in this case it is strongly needed in order to プロセス クラスの waitFor() メソッド. I basically just made the timeout more explicit and a little more flexible because the total timeout is now independent of the inter-retry delay. Ideally, I'd like to receive the standard output using getInputStream waitFor waits indefinitely. (API 26 minimum in Android) I've narrowed this problem down to whether or not I use Process. If the process has already terminated then this method returns immediately with the value true. For some inputs the external process hangs and in such cases, I want to wait for a set timeout period and if the external process is not complete by then, just kill it and return control to the main process (along with exit value so that I can track the failed processes), so that the next external process can be launched. Process ProcessBuilder. bat"); So, the process which you launch from Java (cmd. sh") to lauch other. Socket#setSoTimeout(int) methods. . I'm passing it a code that goes into infinite loop. I already increased the timeout of Mysql, and tried to change the Entity Manager lock バージョン. Socket#connect(java. exitValue(); The default implementation of this methods polls the exitValue to check if the process has terminated. , missing Description. This means you should consume STDERR + STDOUT on different threads, or redirect STDERR to STDOUT, or redirect them to files or inherit IO streams - otherwise you may 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. SocketAddress, int) and java. If the worker thread is still alive, it’ll catch the signal and stop its I find that the timeout calls are not reliable enough in real life, particularly for internet explorer , however the following solutions may be of help: You can timeout the complete test by using @Test(timeout=10000) in the junit test that you are running the selenium process from. Java ProcessBuilder process waiting for input. getRuntime. SECONDS); while ((inputRead=stdInput. If you get Reply from X. Collections; import java. I am trying to run mysql to execute some files from java. exec() to finish? 3. sh 5000 from command line, it completes in a second or so. If I run my_external_process. API Note: Using onExit is an alternative to waitFor that enables both additional concurrency and convenient access to the result of the Process. And then try reading target file. submit(new Callable() { @Override public String call() Processは、ProcessBuilder. Retrieve information about the process. newSingleThreadExecutor(); final Future<String> handler = executor. Process p = Runtime. Causes the current thread to wait, if necessary, until the process represented by this Process object has terminated, or the specified waiting time elapses. This method returns immediately if the subprocess has already terminated. new BufferedReader(new InputStreamReader(process. The solution is to search for the string "TTL" in the result, as it only exists when you get a successful ping. What I noticed though is that not only does it wait for the process you specify, it waits for any sub processes, even after the main process is no longer running. sh) that writes 5000 lines to standard out (stdout). There are many reasons getOutputStream. waitFor(long, java. exe to start the batch file in the background:. readLine() again:. Returns: A String containing the contents of the line, not including any line-termination characters, or null if the end of the stream has been reached It looks like your script score. GetProcesses()). The main thread will send an interrupt signal to the worker thread on timeout. Retrieve input, output, and error streams. int timeOut=5000; //Get path to system folder. Here my suggestion is use Implicitly wait once in the program when every time your Webpage will get refreshed means use Thread. In the posted code, once the process has terminated (i. HOME; Java; java; java. So i would say that they will both behave the same when the subprocess is already terminated but I am executing a shell script from my Java program using Process and I want to kill/destroy that process if my script takes long time. Also from Java doc: java. exec()调用并执行脚本 2. string sysFolder= Environment. waitFor() returns with 0. The command is executing successfully but it is returning 2, that according to convention means abnormal termination. execによって開始されたネイティブ・プロセスの制御を提供します。 このクラスは、プロセスからの入力の実行、プロセスへの出力の実行、プロセスの完了を待つプロセスの終了ステータスのチェック、プロセスの破棄(kill)を行うメソッドを提供します。 Using process builder in java but I want the program to wait while the process is finished. (E. TimeUnit; 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. According to the JavaDoc of class Process some platforms have a limited buffer for the output:. sql. net. For example: A 5 second wait can have a duration of an hour if the clock is moved backward by an hour, or a 10 minute wait will be done after 0 seconds if the clock is The default time-out value, in milliseconds, if the WaitNamedPipe function specifies NMPWAIT_USE_DEFAULT_WAIT. exitValue() in JAVA. That is the code i use: Process process = Runtime. getInputStream(). Simple java8 solution with capturing both outputs and reactive processing using CompletableFuture:. public abstract OutputStream getOutputStream() Returns the output 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. You could change the Callable to instead of returning an Integer to just return the Process or even better a class of your own representing the output of the could you please try query after increasing innodb_lock_wait_timeout to 600, restart of mysql db required in this case. Here I have an external process (my_external_process. How do I wait for a process started by Runtime. I start two Threads to read from the stdout and stderr streams from the Process, so that there is no hang if the stream buffers are full. The native code performs a long-running computation, which might have to be interrupted after a time-out. java; timeout; or ask your own question. Using threads and ProcessBuilder. *; import java. Process hangs waitFor() method. isReachable(timeout) Documentation: Tries to reach this InetAddress. JDK-4244896 - (process) Provide Process. It may exist a more elegant way to accomplish that, but one possible approach is. *; public class PowershellTest implements Runnable This question is about the values of process. close(); proc. process. @EJP oh, okay I dont understand how I can fix this I have a doGet(HttpServletRequest request, HttpServletResponse response) method in my servlet, which many do response. destroyForcibly() and Process. If your application is multi-threaded, then you should redesign it (probably get rid of the whole loop to begin with). I know it seems duplicated, but I have been looking for a solutions in while. getErrorStream(). waitFor(); never returns. I have used a method waitFor of Process class, to execute some UNIX command. Start a process; Wait for it to orderly execute and finish; Kill it if it is crashed (e. Added in 1. 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() blocks the current thread until the process has terminated, at which point the execution control returns to the thread that spawned the process. I'm trying to run a native executable from Java using the Process API. waitFor(). GetFolderPath(Environment. Object java. it will much Better :) First, this is my code : import java. And we need to wait for specific answer, but no more than 30 seconds. other. SECONDS); with timeout of 5 seconds, if the process end can be reasonably certain – Ironluca. exitValue(). If the wait times out there usually isn't any specific action needed, just reacquire the lock, proceed to the loop body, and check the condition as usual. Statement object to enable this setting. System); //Create a new process info structure. This method The Java Process waitFor() method causes the current thread to wait, if necessary, until the process represented by this Process object has terminated. p Process. ) – Anyway, I found out about the start-process command with the -Wait parameter, and it works great for most things. the command actually gives an exit code of 0, thus giving you a lot of false positives. – Processは、ProcessBuilder. Here is the code for my process creation: Process p1 = java. メソッド名がProcess#execを実行した側からの視点になっていることに注意。. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the Example usage for java. IOException: wait pid=15408, kevent failed: Invalid argument at java. Java process waitFor Here, we’ll use a separate thread to perform the long-running operations. The execution thread blocks on the process. Implement wait between processes in Java? 5. waitFor(WAITFOR_TIMEOUT); System. waitFor(timeout), Process. Ask Question Asked 8 years, 5 months ago. waitFor(timeout, unit) doesn't throw NPE if timeout is less than, or equal to zero. WaitFor will block the calling thread until the subprocess is terminated and returns immediately if it has already been terminated. Featured on Meta Upcoming Experiment for Commenting. concurrent. communicate() The subprocess module does not support timeout--ability to kill a process running for more than X number of seconds--therefore, communicate may take forever to run. If process. Waiting for process to end in Java. sleep(timeout) would help: can't be said without more info. So I usually have thread pools injected by Spring and setting them as prototypes I am working on a legacy (Java 6/7) project that uses ProcessBuilder to request a UUID from the machine in an OS-agnostic way. sh who exits with 1, however, process. Maybe it would help. meaning of "last time out" Don't use System. int exitVal = proc. I moved the reading of the processes InputStream into its own thread as the OP has done and was no longer seeing the broken pipe exit code returned. Modified 8 years, to complete IO operations after finishing a process by Runtime#exec. currentTimeMillis(), use System. And If I destroy the process I am not able to get the content of stdInput anymore. //Set a time-out value. So this this value is connection and * or if it is timeout, get out of the loop. destroy() to stop the process if it takes too long. Causes the current thread to wait, if necessary, until the subprocess represented by this Process object has terminated, or the specified waiting time elapses. ca. Also helpful is the waitFor with timeout waitFor(5, TimeUnit. sleep at that time. This method does what it says - it waits for the process to finish during a certain amount of time, or destroys the process otherwise. exceptions. 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 communicate is used to wait for the process to exit: stdoutdata, stderrdata = proc. If the subprocess has not yet terminated, the calling thread will be blocked until the subprocess exits. 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. Adding executorService. Thanks, silky. I'm trying to insert two entities in the DB(Mysql) and I'm getting : ERROR: Lock wait timeout exceeded; try restarting transaction I'm using JPA with Hibernate, and Spring for transaction control. I really wish waitFor had some meaningful timeout though and the Process had a documented way of cleaning up its resources when you've decided to abandon its monitoring. Skip to main content. * Process; waitFor what is meant by "before" in the above statement? before executing obj. 8. The timeout parameter of the constructor is in milliseconds because this value is affected internally to java. Java Class - Do not wait for process to exit. sh just starts another Java process that returns by System. Implementing such a beast isn't such a difficult task, but I'm wondering if anybody knows of an existing implementation. waitFor public abstract int waitFor() throws InterruptedException 必要な場合に、この Process オブジェクトが表すプロセスが終了するまで現在のスレッドを待機させます。 サブプロセスがすでに終了している場合、このメソッドはただちに復帰します。 Correct. lang パッケージで利用できます。; waitFor() メソッド この Process オブジェクトによって示されるプロセスが終了を完了するまで、必要に応じて現在実行中のスレッドを待機させるために使用されます。; waitFor() メソッド プロセスが package com. Process to execute a command, if there is an unexpected situation, such as executing 'cd /tmp/git && git clone xxxx', the parent directory is deleted, and. 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 p. // wait until the result of the process execution is propagated handler. A question about Thread and Process. Once the timeout is reached, i need to abort or interrupt the process. getInputStream())); Please note that on JAVA 8 there is a waitFor overload that let's you specify the specify a timeout. All that happens is that it doesn't wait, it executes right away. JDBC has this mechanism named Query Timeout, you can invoke setQueryTime method of java. The Overflow Blog Robots building robots in a robotic factory. waitFor? It's a good safeguard against buggy processes, and implementing it with an extra thread and an . I'm trying log all output from an Application in java and for some reason it only capturing the first 2 lines i know the application outputs a lot more than this this is my code logOut = new . I am running a Java process on unix. Prototype public boolean waitFor(long timeout, TimeUnit unit) throws InterruptedException. log(inputRead); } the while loop will never terminate because the process is still alive after the waitFor, so I have to destroy it. waitFor() but a problem with process termination. And if it is a timeout, i In my application I fork a script and there is a timeout associated with it. TemporaryQueueReplyManager - Timeout occurred after 20000 millis waiting for reply message with correlationID [Camel-ID You've asked in a comment if Thread. waitFor(7, TimeUnit. But I think readAllBytes will block until the process exits, at which point it will be to late to use waitFor. exitValue throws an IllegalThreadStateException if the subprocess is not terminated and returns the exit value if its terminated. Tasks that are submitted to the ExecutorService are interrupted if they take longer than the timeout to run. Values of process. apache. I tried to use pb. If you want to start another process and wait (with time out) to finish you can use the following (from MSDN). If the process completes faster, the PID file is deleted and the killer process is terminated. This method returns immediately if The process. isAlive() Relates : JDK-8046092 - JEP 102: Process API Updates If there's no exception thrown, Java is waiting for the process to end. lang. 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 terminated. In the body, insert detailed information, including Oracle product and version. concurrent, java. How do I wait till all the commands have finished execu I've utility method for verifying whether a process is still running, given the process name (using Process. 8. 実行プロセスからの出力. Class Process. But the process never throws interruptedException. synchronizedList(new LinkedList()); } // method used to remove an element public static int executeCommandLine(final String commandLine, final boolean printOutput, final boolean printError, final long timeout) throws IOException, InterruptedException, TimeoutException { Runtime runtime = Runtime. (As the process is not spawned by my code, I can't use WaitTillExit to know when it's no longer running) PS: the process runs on a remote machine This loop will iterate once for every completing task as it finishes. Enforced Timeout. io. locks) would be more appropriate. redirect(), response. exec("other. UnixProcessGen2. Hope this helps. getByName(host). */ } catch (InterruptedException e) { e. there is something about the process and/or your Java code that means that the process won't exit. Waiting for finished Java-process. out The problem isn't with handling the external process, it's the incorrect use of the ExecutorService returned by Executors. Multiple process may be started. Follow edited Aug 23, 2022 at 12:24. X. ] can be accessed via [. This issue usually occurs because the executed command does not quit In both cases, you'll need to take special care to safely get the timeout value from your the objects you are monitoring. But I'm thinking that when there is no client trying to connect, the execution stays inside ConnectNamedPipe, and if the server in that moment decides to close the pipe and shutdown, it needs ConnectNamedPipe to return, in order to call at least CloseHandle. This method creates a thread running in the background, and because you never shut down this executor (which would stop the thread), this thread prevents the JVM from exiting. shutdown() solved the problem, and the application now terminates as expected. which might have to be interrupted after a time-out. readLine()) != null){ Helper. Source Link As for Process. First, I'm not too sure how your code works your timeout starts after you begin to read the stdout of the spun Process object for non-null lines, but if you read the Javadoc of BufferedReader. start() Process actually allows the created Process to resume its normal behavior. 9. DataSource, the question can be resolved easily. getRuntime(). 2. If I first I'd like to send a message to a RabbitMQ server and then wait for a reply message (on a "reply-to" queue). For some inputs the external process hangs and in such cases, I want to wait for a set timeout period and if I am trying to get all files and folders from /data/data folder in rooted android device from java. Java, wait for child process to exit. For example: Process process = new ProcessBuilder(command, and, arguments) 2 Use waitFor(long timeout, TimeUnit unit) (Only 1. I'm aware of the problem with the input and output streams, and I'm trying to read them as follows: ProcessBuilder Spec of j. If the subprocess has already terminated then this method returns immediately with the value true. The Assignee David Williams also said that 'PING' can be used instead, you may also notice that I'm looking for an ExecutorService implementation that can be provided with a timeout. A timeout is a safety mechanism so that if a notification is missed the thread won't hang forever. You yourself saying that its an infinite loop. Share. The task has to be written with this ability in mind. Typically, you will use a synchronized method in the object to ask for it's timeout status. Waiting on threads. interrupt(); raises the interrupt flag again. However, I found that in real life scenarios I do know the number of tasks, thread pool settings do need to be configurable per deployment, and pools can be reused. I'm having problems with running an exernal application out of Java. currentThread(). tutorialspoint; import java. lnk shortcut which it self executes a . 0 By using start, you are askingcmd. Process. so try putting some delay using Thread#sleep after Process#waitFor in order to let IO processing complete. sleep() raises the interrupt flag. stdin, stdout, stderr) operations [. exec("cmd /c start /b /wait " + batchFile); int returnVal = p1. Java - Read process output when it's I am using Java's ProcessBuilder to start a subprocess, which is another Java program that has to run in a separate JVM. You can also use some back-off strategy or some other way of varying inter-retry delays without changing the rest of the logic. 0. 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 You can implement this feature in your own CountDownLatch. Stack Overflow. exe) returns before the background process is finished. Process のwaitFor()は、実行されたプログラムの出力が戻る前に読んだ？ ドキュメントには、次のようにのみ記載されています。 必要に応じて、この Process オブジェクトで表されるプロセスが終了するまで、現在のスレッドを待機させます。 The java. Java process waitFor. newSingleThreadExecutor(). 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 . When I run this, waitFor waits 60 seconds for the process to complete and then returns false. wait() means before executing any instruction defined above it? This means if the thread gets/got interrupted before call to the wait() method is executed, this would still result in throwing the InterruptedException when the actual call to wait() happens. but the difference is we can use Implicitly wait for entire program but Thread. 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 You can use this in tandem with Process. You can keep a timestamp of when the method countDown() is called, compare it to the timestamp when the waiting was started, adjust the waiting time and wait again if the timestamps are different. exec("cmd /c start " + path + "\\RunFromCode. 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 Implicitly wait and Thread. waitFor() is hanging. If I call it I see the problems, if I don't it works fine. vlp. util. Java runtime process waitfor does not appear to wait for Process hangs waitFor() method. waitFor() currently is, remove process. Use process = Runtime. However, there are scenarios where this method seems to never return, causing the application to hang indefinitely. exec() method is: first clone a process that has the same environment variables as the current virtual machine, then use this process to execute external commands, and finally exit the process. Option 1 (preferred): final Duration timeout = Duration. execメソッドはネイティブのプロセスを作成し、Processのサブクラスのインスタンスを返しますが、これを使えば、そのプロセスを制御したり情報を Thanks for the suggestions. The idea is to create an ExecutorCompletionService wrapping your Executor, submit some known number of tasks through the CompletionService, 1. Concrete implementations of this class are strongly encouraged to override this method with a more efficient implementation. close(); return exitVal; } What I am not able to figure out is, how to do this. By using start, you are askingcmd. The process of the Java virtual machine executing the Runtime. So the nDefaultTimeOut arg in CreateNamedPipe sounds like the default timeout that the clients which would connect to the pipe would use for their operations and only if they call the WaitNamedPipe function. out. The method returns immediately when the subprocess has been terminated and if the subprocess is not terminated, the thread will be blocked. banctecmtl. I googled and found that it depends on "source code of the program that is outputting this exit code". Remove the start command to run the batch file in the foreground - then, waitFor() will But sometimes the other process takes a long time to return the results and I am having getting the timeout exception. exe file. (As the process is not spawned by my code, I can't use WaitTillExit to know when it's no longer running) PS: the process runs on a remote machine I would like to ask advice how to solve with Mono/Flux suspending and reactivating by delay or timeout. This is because the process. I run Tomcat as root. Usually this is good, but I have a weird situation. If your application retrive JDBC connection vi java. Results and next steps for the Question Assistant experiment in Staging Ground I was having a similar issue executing the process in a thread who's run method would read the process InputStream and then call the waitFor() method. 4. SpecialFolder. Process#getInputStream → Process#execで実行したプロセスが標準出力に出力する内容を取得するためのInputStreamを取得 Java で外部プロセスを起動する際は ProcessBuilder クラスを使いますが、 たまに処理が戻ってこない場合があります。 そんな場合に原因として考えられるのは、標準出力または標準エラー出力にバッファが溜まってしまっているという理由です。 Browse other questions tagged . What is the best way to do this? Below is my code: The class Process doesn't have a "waitFor" When writing Java programs, sometimes we need to call other programs or scripts such as exe and shell. Lambda expressions can be used to evaluate the result of the Process execution. process. The java application that got started used an ExecutorService that did not got shotdown correctly and left zombie threads alive which prevented process termination. waitFor(); proc. Get all output to console from a Process in java. The process may be ending without completing the task at hand. wait() but it keeps on waiting. getGamePath()). Is there a way (either builtin, or with external library) to have a time limit for Process. If other parts of your program (e. It sounds like a very basic task, yet I can't find a way to do this. And this isn't Java's fault, this is how pthreads work. waitFor()方法返回值是否为0来确定是否成功执行（成功为0） 3. Calling Thread. getPid() => shuld able to give the process id of the jvm process it is running in (java. How to use exitValue() with parameter? 22. start()メソッドやRuntime. List; public class ObjectDemo extends Object { private List synchedList; public ObjectDemo() { // create a new synchronized list to be used synchedList = Collections. execによって開始されたネイティブ・プロセスの制御を提供します。 このクラスは、プロセスからの入力の実行、プロセスへの出力の実行、プロセスの完了を待つプロセスの終了ステータスのチェック、プロセスの破棄(kill)を行うメソッドを提供します。 API Note: Using onExit is an alternative to waitFor that enables both additional concurrency and convenient access to the result of the Process. クラスProcess java. killChildrenOf is a script that fetches all I start processes with ProcessBuilder in Java. 5. 使用方法Runtime. See Handling Processes When They Terminate with the onExit Method for In this page you can find the example usage for java. I do recommend everyone who needs to invoke external process in java to use Apache Commons Exec library instead of reinventing it again. Wait for process to finish before proceeding in Java. So I tried to find the source code for waitFor method, I came to know When I use the method of java. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the Having a timeout doesn't change that. Java Wait-For-Thread Question. Add a comment | According to the JavaDoc of class Process some platforms have a limited buffer for the output:. wait(timeout): when the timeout expires the thread wakes up and tries to re-acquire the synchronization lock (i. 3.
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