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32 строки
1.2 KiB
Plaintext
32 строки
1.2 KiB
Plaintext
From a Java program, I needed to test if another Java program was running. My first thought was that the jps tool already
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provides me with this information. But I was being curious how he does that. So I had a look at its bytecode, and created
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a very simplified version of the jps tool.
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package jps;
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import java.net.URISyntaxException;
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import java.util.Set;
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import sun.jvmstat.monitor.*;
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public class MyJps
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{
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public static void main(String[] args) throws MonitorException, URISyntaxException
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{
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MonitoredHost monitoredHost = MonitoredHost.getMonitoredHost("localhost");
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Set<Integer> activeVms = monitoredHost.activeVms();
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for (int psId : activeVms)
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{
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MonitoredVm monitoredVm = monitoredHost.getMonitoredVm(new VmIdentifier(String.valueOf(psId)));
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String mainClass = MonitoredVmUtil.mainClass(monitoredVm, false);
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System.out.println(mainClass + " [" + psId + "]");
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}
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}
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}
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It uses classes from the tools.jar, so do not forget to include it in your classpath if you run this class. From there, it is
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not difficult to write a small method that test if a given Java process is running. Also, it is not difficult to change this
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code to make it work on a distant server.
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