以编程方式从 Grid 进程生成第二个 Selenium Grid 节点作为另一个进程时出现

Question

我正在设置 Selenium Grid，它可以从 Grid Servlet 端点上的 HTTP 请求生成新的节点实例：SpawnNodeServlet。GET 请求上的 Servlet 正在创建新的 Selenium 网格节点，并配置将其注册到集线器。这样我就可以在需要时通过在 下发送 GET 请求来添加节点http://localhost:4444/grid/admin/SpawnNodeServlet。一切正常，直到我想生成第二个或下一个节点。只有第一个工作正常，之后我得到了 ParameterException （下面的所有代码）。由于第一个节点正确注册，参数应该没问题。有什么想法可能是错的吗？我认为，问题可能出在流程创建实施中。

我尝试从 Runtime exec 作为普通命令执行 jar，但这也无法正常工作。

final Runtime runtime = Runtime.getRuntime();

final Process command = runtime.exec(executionArgs.toArray(new String[0]));

下面是InstanceExecutor创建新 Node 实例的主要代码：

public class InstanceExecutor {

    private final Logger logger = Logger.getLogger(getClass().getName());

    private BufferedReader errorBufferedReader;

    private BufferedReader outputBufferedReader;

    private int exitValue;

    public void execute(List<String> args) throws InstanceExecutorException {

        final List<String> executionArgs = new ArrayList<String>();

        executionArgs.add(0, "java");

        executionArgs.addAll(args);

        try {

            final ProcessBuilder processBuilder = new ProcessBuilder(executionArgs.toArray(new String[0]));

            Process process = processBuilder.start();

            logger.info("processBuilder.start()");

            this.errorBufferedReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));

            this.outputBufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));

            logger.info("BufferedReader's");

            process.waitFor();

            this.exitValue = process.exitValue();

            if (this.exitValue != 0) {

                throw new IOException("Failed to execute jar, " + this.getExecutionLog());

            }

        } catch (final IOException | InterruptedException e) {

            throw new InstanceExecutorException(e);

        }

    }

Answer 1

在SpawnNodeServlet中，您应该删除类字段nodeArgs，并将nodeArgs定义为本地方法变量。您有实例字段：private final List<String> nodeArgs = new ArrayList<String>();第一次服务调用后列表包含：&nbsp; &nbsp; "-Dwebdriver.chrome.driver=\"libs//chromedriver\""&nbsp; &nbsp; "-cp"&nbsp; &nbsp; "hub/target/hub-1.0.0-jar-with-dependencies.jar:node/target/node-1.0.0-jar-with-dependencies.jar"&nbsp; &nbsp; "org.openqa.grid.selenium.GridLauncherV3"&nbsp; &nbsp; "-role"&nbsp; &nbsp; "node"&nbsp; &nbsp; "-nodeConfig"&nbsp; &nbsp; "node/config.json"第二次调用后：&nbsp; &nbsp; "-Dwebdriver.chrome.driver=\"libs//chromedriver\""&nbsp; &nbsp; "-cp"&nbsp; &nbsp; "hub/target/hub-1.0.0-jar-with-dependencies.jar:node/target/node-1.0.0-jar-with-dependencies.jar"&nbsp; &nbsp; "org.openqa.grid.selenium.GridLauncherV3"&nbsp; &nbsp; "-role"&nbsp; &nbsp; "node"&nbsp; &nbsp; "-nodeConfig"&nbsp; &nbsp; "node/config.json"&nbsp; &nbsp; "-Dwebdriver.chrome.driver=\"libs//chromedriver\""&nbsp; &nbsp; "-cp"&nbsp; &nbsp; "hub/target/hub-1.0.0-jar-with-dependencies.jar:node/target/node-1.0.0-jar-with-dependencies.jar"&nbsp; &nbsp; "org.openqa.grid.selenium.GridLauncherV3"&nbsp; &nbsp; "-role"&nbsp; &nbsp; "node"&nbsp; &nbsp; "-nodeConfig"&nbsp; &nbsp; "node/config.json"然后您将此列表传递给执行者：instanceExecutor.execute(nodeArgs);这不是有效的 java 参数列表。