Java服务刚启动时接口超时排查全过程

function flamegraph_sample(){
    # 不断检测服务直到它启动完成
    while sleep 1; do curl -sS --connect-timeout 3 -m3 http://127.0.0.1:8080/health | grep ok && break; done
    pid=`pgrep -n java`
    for i in {1..3}; do
        java -jar arthas-boot.jar -c "profiler start --alluser" "$pid";
        sleep 10s;
        java -jar arthas-boot.jar -c "profiler stop --file /tmp/flamegraph_cpu_%t.html " "$pid";
    done
    java -jar arthas-boot.jar -c "stop" "$pid";
}

profiler start -e wall --file /tmp/result.jfr

private static final String[] CLASS_PREFIX_ARR = new String[] {
                "org.apache", "com.thoughtworks", "io.netty", "com.google", "io.grpc",
                "com.alibaba", "org.springframework", "cn.hutool", "com.fasterxml", "org.hibernate", 
                "io.opencensus", "org.redisson", "io.micrometer", "io.prometheus",
        };
PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
for (String classPrefix : CLASS_PREFIX_ARR) {
    Resource[] resources;
    try {
        resources = resolver.getResources(
                "classpath*:" + StringUtils.replaceChars(classPrefix, '.', '/') + "/**/*.class");
    } catch (IOException e) {
        ExceptionUtils.rethrow(e);
        return;
    }
    for (Resource resource : resources) {
        String className = null;
        try (InputStream is = resource.getInputStream()) {
            ClassReader cr = new ClassReader(is);
            className = StringUtils.replaceChars(cr.getClassName(), '/', '.');
            Class<?> clz = Class.forName(className);
            log.info("preLoadClass success: " + className + ", classLoader: " + clz.getClassLoader());
        } catch (Throwable e) { 
            log.warn("preLoadClass failed: " + className);
        }
    }
}