Question

问题：我想在spring boot项目中从webservice执行java jar文件。并希望监控它。

问题：我能够执行此流程，但问题是该流程未进一步处理。

我想知道为什么这个过程在等待以及为什么它没有被处理。我该如何监控其进展情况。

在以下条件下进行处理：

一旦我停止了春季启动项目或tomcat。
如果我删除process.waitFor();

我尝试了来自this的解决方案，即从另一个线程执行该过程。

我的网络服务电话

@RequestMapping(value="/startAnalysis", method=RequestMethod.POST)
public String startAnalysis() {
    List<String> cmd = new ArrayList<>();
    cmd.add("java");
    cmd.add("-jar");
    cmd.add("test.jar");
    try {
            //Process p = Runtime.getRuntime().exec(cmd.toArray(new String[0]));

            //ProcMon procMon = new ProcMon(cmd);
            //Thread t = new Thread(procMon);
            //t.setName("procMon");
            //t.start();

            ProcessBuilder processBuilder = new ProcessBuilder(cmd);
            Process process = processBuilder.start();
            process.waitFor();

    } catch (Exception e) {
        e.printStackTrace();
    }
    return "success";
}

先谢谢。

Answer 1

通常，进程等待调用进程消耗它的输出。有时这只是意味着输出显示在终端上，但在这种情况下，您可能需要读取输入流直到它阻塞。如果您不知道该过程应该如何表现，您可能只想在单独的线程中读取process.getInputStream（）。在某些状态下，您的进程也可能正在等待将某些内容写入process.getOutputStream（）。

您需要检查jar的文档，或者直接从命令提示符/ shell执行它并尝试它的行为。然后，您可以更改应用程序以按预期的方式读取输出。

在许多应用中，输出最容易逐行读取：

final String EXPECTED_OUTPUT = "Hello World";

BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String firstLine = reader.readLine();
if (!firstLine.equals(EXPECTED_OUTPUT)) {
    // handle unexpected situation
}
// maybe handle some more output
// or send something to the process.getOutputStream() in response
// and finally wait for the application to exit when it should be done
process.waitFor();

Answer 2

请详细说明在某些情况下process.waitFor()对waitFor()的调用根本不会返回的原因here。

或者，看看您是否可以使用我们提供timeOut值的2017-11-06 11:11:02,699 ERROR [Timer-Driven Process Thread-6]o.a.n.processors.hive.PutHiveStreaming PutHiveStreaming[id=819a7fe2-015f-1000-7097-cd3f8614c9c2] Error connecting to Hive endpoint: table oneviewtest3 at thrift://parent.rolta.com:9083 2017-11-06 11:11:02,699 ERROR [Timer-Driven Process Thread-6] o.a.n.processors.hive.PutHiveStreaming PutHiveStreaming[id=819a7fe2-015f-1000-7097-cd3f8614c9c2] Hive Streaming connect/write error, flow file will be penalized and routed to retry. org.apache.nifi.util.hive.HiveWriter$ConnectFailure: Failed connecting to EndPoint {metaStoreUri='thrift://parent.rolta.com:9083', database='default', table='oneviewtest3', partitionVals=[] }: org.apache.nifi.processors.hive.PutHiveStreaming$ShouldRetryException: Hive Streaming connect/write error, flow file will be penalized and routed to retry. org.apache.nifi.util.hive.HiveWriter$ConnectFailure: Failed connecting to EndPoint {metaStoreUri='thrift://parent.rolta.com:9083', database='default', table='oneviewtest3', partitionVals=[] } org.apache.nifi.processors.hive.PutHiveStreaming$ShouldRetryException: Hive Streaming connect/write error, flow file will be penalized and routed to retry. org.apache.nifi.util.hive.HiveWriter$ConnectFailure: Failed connecting to EndPoint {metaStoreUri='thrift://parent.rolta.com:9083', database='default', table='oneviewtest3', partitionVals=[] } create table oneviewtest3 (TNT_KEY BIGINT, PLANT_KEY BIGINT, UNIT_KEY BIGINT, TAG_DATA_SRC STRING, TAG_DATA_RLVNC STRING, TAG_TYPE_ID STRING, DB_RQST_ID STRING, BATCH_KEY BIGINT, OPC_TAG_ID STRING, OPC_TAG_VAL_TS STRING, OPC_SRC_STM_CODE BIGINT, OPC_TAG_VAL STRING, OPC_QLTY_VAL BIGINT, REF_ID STRING, REF_TYPE STRING, ERROR_CODE STRING, OPC_TAG_VAL_AGG_TYPE STRING, OPC_TAG_RSMPL_INTRVL_VAL BIGINT, OPC_TAG_RSMPL_INTRVL_TYPE STRING, OPC_TAG_VAL_TS_PRC STRING, FLEX_FIELD1 STRING, FLEX_FIELD2 STRING, FLEX_FIELD3 STRING, FLEX_FIELD4 STRING, FLEX_FIELD5 STRING, ETL_BTCH_ID BIGINT) CLUSTERED BY (OPC_TAG_ID) into 4 buckets stored as orc tblproperties ("transactional"="true","orc.compress"="NONE");方法。

从spring webservice和monitor执行进程？

2 个答案: