java - 在锁定 tomcat 临时文件夹的情况下配置 Glowroot 显示以下异常

Question

我正在客户端 Tomcat 上配置Glowroot代理，出于安全原因，我们只提供对 Tomcat 临时目录的读取访问权限，glowroot -> tcnative -> netty 用于在 Tomcat 临时目录中创建临时文件并成功执行后删除它，但由于我们限制对临时文件夹的访问，我得到了这个异常。如果我提供rwx访问 Tomcat 临时文件夹一切正常。

java.lang.IllegalStateException: Could not find TLS ALPN provider; no working netty-tcnative, Conscrypt, or Jetty NPN/ALPN available
    at org.glowroot.agent.shaded.io.grpc.netty.GrpcSslContexts.defaultSslProvider(GrpcSslContexts.java:258)
    at org.glowroot.agent.shaded.io.grpc.netty.GrpcSslContexts.configure(GrpcSslContexts.java:171)
    at org.glowroot.agent.shaded.io.grpc.netty.GrpcSslContexts.forClient(GrpcSslContexts.java:120)
    at org.glowroot.agent.central.CentralConnection.<init>(CentralConnection.java:125)
    at org.glowroot.agent.central.CentralCollector.<init>(CentralCollector.java:135)
    at org.glowroot.agent.init.NonEmbeddedGlowrootAgentInit$1.run(NonEmbeddedGlowrootAgentInit.java:136)
    at org.glowroot.agent.impl.BytecodeServiceImpl.enteringMainMethod(BytecodeServiceImpl.java:255)
    at org.glowroot.agent.impl.BytecodeServiceImpl.enteringMainMethod(BytecodeServiceImpl.java:77)
    at org.glowroot.agent.bytecode.api.Bytecode.enteringMainMethod(Bytecode.java:32)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java)

根据文档，我们可以通过 vm 参数设置 netty tmp 目录 -Dio.netty.native.workdir=/some/dir 但这并不符合运行时它根据 io.netty.util.internal.PlatformDependent 中的代码跳回 tomcat temp 的情况。

private static File tmpdir0() {
    File f;
    try {
        f = toDirectory(SystemPropertyUtil.get("io.netty.tmpdir"));
        if (f != null) {
            logger.debug("-Dio.netty.tmpdir: {}", f);
            return f;
        }

        f = toDirectory(SystemPropertyUtil.get("java.io.tmpdir"));
        if (f != null) {
            logger.debug("-Dio.netty.tmpdir: {} (java.io.tmpdir)", f);
            return f;
        }

        // This shouldn't happen, but just in case ..
        if (isWindows()) {
            f = toDirectory(System.getenv("TEMP"));
            if (f != null) {
                logger.debug("-Dio.netty.tmpdir: {} (%TEMP%)", f);
                return f;
            }

            String userprofile = System.getenv("USERPROFILE");
            if (userprofile != null) {
                f = toDirectory(userprofile + "\\AppData\\Local\\Temp");
                if (f != null) {
                    logger.debug("-Dio.netty.tmpdir: {} (%USERPROFILE%\\AppData\\Local\\Temp)", f);
                    return f;
                }

                f = toDirectory(userprofile + "\\Local Settings\\Temp");
                if (f != null) {
                    logger.debug("-Dio.netty.tmpdir: {} (%USERPROFILE%\\Local Settings\\Temp)", f);
                    return f;
                }
            }
        } else {
            f = toDirectory(System.getenv("TMPDIR"));
            if (f != null) {
                logger.debug("-Dio.netty.tmpdir: {} ($TMPDIR)", f);
                return f;
            }
        }
    } catch (Throwable ignored) {
        // Environment variable inaccessible
    }

    // Last resort.
    if (isWindows()) {
        f = new File("C:\\Windows\\Temp");
    } else {
        f = new File("/tmp");
    }

    logger.warn("Failed to get the temporary directory; falling back to: {}", f);
    return f;
}

如何强制设置Netty tmp目录？

Answer 1

尝试这个虚拟机参数-Dorg.glowroot.agent.shaded.io.netty.tmpdir="your\path"