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JavaVMArguments.java
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JavaVMArguments.java
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package jenkins.util;
import edu.umd.cs.findbugs.annotations.NonNull;
import hudson.Functions;
import hudson.util.ProcessTree;
import java.lang.management.ManagementFactory;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Stream;
import org.kohsuke.accmod.Restricted;
import org.kohsuke.accmod.restrictions.NoExternalUse;
/**
* List of arguments for Java VM and application.
*/
@Restricted(NoExternalUse.class)
public class JavaVMArguments {
/**
* Gets the process argument list of the current process.
*/
@NonNull
public static List<String> current() {
ProcessHandle.Info info = ProcessHandle.current().info();
if (info.command().isPresent() && info.arguments().isPresent()) {
// Java 9+ approach
List<String> args = new ArrayList<>();
args.add(info.command().get());
Stream.of(info.arguments().get()).forEach(args::add);
return args;
} else if (Functions.isGlibcSupported()) {
// Native approach
int pid = Math.toIntExact(ProcessHandle.current().pid());
ProcessTree.OSProcess process = ProcessTree.get().get(pid);
if (process != null) {
List<String> args = process.getArguments();
if (!args.isEmpty()) {
return args;
}
}
}
// Legacy approach of last resort
List<String> args = new ArrayList<>();
args.add(
Paths.get(System.getProperty("java.home"))
.resolve("bin")
.resolve("java")
.toString());
args.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments());
return args;
}
}